Use your mobile phone number to locate how to find someone

1. Positioning based on GPS

Use the GPS positioning module on the mobile phone to send your position signal to the positioning background to achieve the positioning of the mobile phone. The positioning accuracy is high, and the method of positioning the WIFI in a small range.

2. Positioning of the base station based on the mobile operation network

The base station positioning uses the calculation distance of the base station's distance to determine the location of the mobile phone. This method does not require the mobile phone to have the GPS positioning ability, but it depends on the distribution and coverage of the base station. Sometimes the error will exceed 200 meters. ThereforeIn terms of accuracy, it is not as good as GPS positioning.

When you need a friend or family you need to care about the accident, where can you pass? The mobile phone number quickly determines that the opponent's general position can be found.You can also manage the employee's foreign service route and pay attention to the employee's foreign service attendance through the mobile phone number. For the logistics team, you can also investigate the general location of the vehicle cargo through the mobile phone number.

mobile phone number positioning principle

The mobile phone positioning system refers to the location information of mobile phones or end users through specific positioning technology(Latitude coordinates., Sign the technology or service of the position of the positioning object on the electronic map.

There are two types of mobile phone positioning technology, one is based onGPSThe positioning of the positioning is based on the base station of the mobile operation network.based onGPSThe positioning method is to use the mobile phoneGPSThe positioning module sends its own location signal to the positioning background to achieve mobile phone positioning.The positioning of the base station uses the calculation distance of the distance of the mobile phone to determine the location of the mobile phone. The latter does not require the mobile phone to haveGPSPositioning ability, but the accuracy depends to a large extent on the distribution and coverage of the base station, and sometimes the error will exceed one kilometer.

Advantages of mobile phone number positioning technology

1, Unique base station positioning technology (base station positioning technology, unique operator, low requirements for terminals)

2, New and informative electronic map (large proportional electronic map)

3, Rich communication channels (SMS, related call centers services)

4, Perfect security system (hardware custard, network guarantee, software confidentiality and certification)

5, Safe and reliable communication methods (high connection rate, no noise, non -eavesdropping, green)

62. Privacy protection (generally authorized by the person to be positioned)

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1. Features of Bluetooth GPS wireless module

Although the Bluetooth GPS receiver is more expensive, the advantage is self -evident. The biggest feature is to get rid of the restraint of the data cable.smart phone of the operating system.Another feature is that you can place the range of no more than 10 meters between the smartphone and the Bluetooth GPS between the two. This advantage is that the GPS receiver can be placed to the place where the satellite model is favored.In the location of the viewing, for example, NOKIA's latest GPS module provides lane, which can be hung on the chest for easy carrying.In addition, it is used for car navigation to use an external antenna. At this time, you should consider whether the GPS receiver provides an external antenna interface.

2. Disadvantages and advantages

1. Bluetooth GPS is very small, easy to carry, simple use.

2. Bluetooth GPS can be used with smartphones, laptops, and PDA palm computers.It's not troublesome to use!It is best to use genuine navigation maps. If you temporarily use pirated maps, there are currently intercity pirated maps, pirated map 3.05 pirated maps, Kailid navigation maps (intelligent use on mobile phones), Route 66 test version map, ozi, mapking......wait.For details, please go to the navigation map column to view.

3. Bluetooth GPS price is not expensive.The cheapest is only about 500 in China, and the best imported from Taiwan is about 880 yuan.There are nearly 20 types of Bluetooth GPS in the market for you to choose.

4. Choose Bluetooth GPS. When using smartphones and PDAs, it will no longer occupy the battery resources of the mobile phone or PDA alone, because the Bluetooth GPS is equipped with a battery, both equipped with vehicle chargers and 220V battery chargers.

Bluetooth GPS wireless template

1) Quick search: 32 XXX search at the same time, 20 channels.

2) High -tech GPS chip: Sirf Star III chip.

3) Quick TTFF: 200,000 valid decoders, which can ensure that fast TTFF can still operate when low signals.

4) Built -in Waas/EgNOS (optional hidden WAAS/EGNOS device) and DGPS high -precision positioning.

5) Quick heat start: built -in charging lithium batteries can provide sufficient power for fast heat start.

6) Support protocol NMEA-0183 v3. Data protocol.

7) Strengthening the computing method provides super navigation performance, which can be located in environments such as cities, canyons or trees.

8) No user initialization settings are required.

9) LED light number display status: LED's light display status allows users to judge the power status. When the power supply is connected, the LED light is on. When the GPS-6036 is located, the indicator light "On" is shining, no need to use it no longer need to use it.Other devices to distinguish.

Disclaimer: The above method stems from the index of the program system or the sharing of netizens. It is for your reference only and does not represent the research perspective of this website. It proves that it is valid. Please pay attention to the authenticity and authority of the source of the content of the content.Apply to delete & gt; & gt; error correction & gt; & gt;

Types of astronomical Telescope

Optical Telescope is roughly divided into three categories: refraction type, reflex, reflective type.

1. Refractable Telescope

Advantages: The imaging is very sharp, sharp, and high.Connecting the "Positive mirror" can make the imaging not upside down, which is conducive to the observation of the ground scenery.It is easy to maintain and has a long service life, but be careful not to let the lens moldy.

Disadvantages: The price is high, and the same price can buy a larger reflected Telescope.There is still a little residual color difference in the ordinary color difference Telescope.The residual color difference is too small to ignore the price of the "reunion color difference Telescope" price and its expensive.

2. Petamina Telescope

Advantages: Low price (compared to the refraction mirror), the same price caliber, you can see more and darker celestial bodies.Imaging colorless difference.Cost -effective.Most of the large -caliber Telescopes of professional observatory are reflective structures.

Disadvantages: Daily maintenance is relatively troublesome.

Astronomical Telescope parameter

1. Activity

The diameter refers to the effective light diameter of the object mirror, which is often represented by the symbol "d".The ability to collect starlights is directly proportional to the Square of its caliber.Therefore, the greater the caliber of the objective mirror, the more likely it is to observe the darker celestial body.

2. Differential angle and resolution skills

The distinguishing angle is usually based on the angle seconds, which refers to the angle distance between the two light points that can be discussed by the Telescope.During the visual observation, the distortion angle of the Telescope = 140 (angle seconds) / d (millimeter), D is the effective caliber of the object mirror.The distortion of the Telescope is measured by the countdown of the distinction angle of the Telescope, so the larger the diameter of the Telescope, the better the discrimination.

3. magnifying rate

The magnification rate is the physical quantity of the visual Telescope, that is, the angle of the magnification.The amplification rate of the eyes Telescope is equal to the ratio of the focal length of the material mirror to the focal length of the eyed mirror. Therefore, as long as the differential mirrors are changed, the magnification of the Telescope can be changed.However, due to the limitation of the deduction of the object mirror, the magnifying rate of the Telescope cannot be increased without limit. Generally speaking, the amplifier rate is roughly 2D (the value of the 2 objective mirror diameter, and the caliber value is based on millimeter).During the observation, it is by no means the optimal rate of the maximum.If the magnifying rate far exceeds its magnifying multiplier limit, although the star statue looks larger, it does not increase its clarity. On the contrary, it will make the star statue blur, dimVery narrow.

4. Vision field

The sky corner diameter can be called the visual field of the Telescope corresponding to the area corresponding to the good imaging of the Telescope.The bigger the field of view, the wider the vision that sees it.The field of view of the Telescope is inversely proportional, the greater the magnifying rate, the smaller the field of view.Different diameter, different focal lengths, different optical systems (including objectives and eyepiece) and quality determine the size of the viewing field of the Telescope.When looking at the starry sky, if you use a large viewing Telescope plus a wide -angle mirror, you will feel like walking in the starry sky.

5, extreme star, etc.

"Xingwu" is an indicator of the brightness of the celestial body, which is often represented by the symbol "M".The smaller the value of the star, the brighter the star; the larger the value of the star, the darker the star.The difference between the stars is 2.512 times the difference between the brightness.Extreme stars refer to the stars with the darkest celestial body with a Telescope.The visual limit star of the Telescope can be roughly estimated by the following formulas: M = 2.1 5LOGD formula D (caliber) is based on millimeter.

Note: The light pollution in large cities will seriously affect the size of the extreme star, so the best observation location is to stay away from the outskirts of urban light pollution.

Astronomical Telescope mirror

1. Huachangs mirror (H)

It was developed in 1703.It consists of 2 slices of convex lenses, with a small view of the field, about 25-40 degrees. It is relatively short (the distance from the eyed mirror to the eyes) is relatively short.Patch mirror.Because the Wynos mirror is easy to make and the price is low, it is often used on a small entry -level Telescope.

2. Romans Deng mirror (R or SR)

It was a successful design in 1783, and it was also two flat -mirror structures with two convex mirror structures with the same focal length.The field of view is about 30-45 degrees.The ball difference, axial color difference, and distortion of Raraz Eye mirrors are less than Waisse mirrors, and the venue is also significantly reduced.But the distance from the pupil is also short.Both Romin and Wynos belong to the first generation of eyepiece.

3. Kylene mirror (K)

It appeared in 1849 and was composed of three lenses.It is developed on the basis of Ranzeson's mirror. The main improvement is to change the single -piece lighting mirror to the dual -glue combined color differential lens.Improve the image of the edge, and the effective field of view reaches 40-50 degrees.In the middle and low rates, the imaging quality of the Kylene mirror is better than that of Wets and Romin.In addition, the field mirror of the Kelna eye mirror is close to the focal plane, so that the dust on the field mirror is easy to images and affects observation, so pay special attention to cleaning.

4. Abbey disordered eye mirror (or)

In 1880, it was designed by Abe in Germany. It is a structure of four pieces and two sets. Among them, the field mirror is a three -gluble lens, and the mirror is a flat -convex lens.The degree of detecting, it also has a flat field of viewing at 40-50 degrees and sufficient pupil distances. It has performed well in each magnification and has been widely adopted.But the price is relatively high.

5. Pruden eye mirror (PL or Plossl)

Also known as "symmetrical mirror".It is a four -piece structure, consisting of two two sets of dual -gluing color differential lenses. Its parameter performance is equivalent to OR eyepiece, but PL eyepiece has a greater pupil distance and field of view.Because the two anti -colored differential gum compounds in PL eyepiece can be exactly the same, the cost ratio is low, and it is currently the most widely used eyepiece mirror.K, OR, PL belong to the second -generation eyepiece.

6. About the size of the eyepiece interface

There are roughly three interface specifications of the Telescope eye mirror: 24.5 mm (0.965 inches), 31.7 mm (1.25 inches), and 50.8 mm (2 inches).24.5 mm is mainly used for small entry -level Telescopes. 31.7 mm is the current mainstream size.50.8 mm is mainly used on high -end large -diameter Telescopes.

Astronomical Telescope selection guide

1. Comparison of the type of astronomical Telescope

1) The refracted astronomical Telescope is more convenient to use, the field of view is large, the star is bright, but the color difference is reduced, which reduces the resolution.The objective mirror of high -quality refractive mirrors is two double -separated color differential mirrors or 3 recovery differential mirrors.However, color difference or compound dispenusion difference can not completely eliminate color differences.

2) The advantage of the reflector astronomical Telescope is that there is no color difference.Commonly used reflectors include Newtonian and Cargreen.The former is simple and cheap, the spherical reflex mirror is on the back end, and the eyepiece is on the front side of the front end; the main and auxiliary mirrors of the latter optical system are non -spherical, the main mirror and eyepiece are behind.Essence

3) The refractive astronomical Telescope mirror takes into account the advantages of the refracted mirror astronomical Telescope and reflector astronomical Telescope: large visual field, good image, short lens barrel, easy to carry.Compared with the focal length and the refraction Telescope of the same caliber, the price is less than one -third of the price.There are two types of refractive mirrors: Schmith -Cargreen style and Mark Sotov -Kasseglin -style, which is also called the horse -card mirror.Horse -card mirrors have two types and three types.For example: Bosma1800150 astronomical Telescope and BOSMA2400200 astronomical Telescope are all three pieces. Because the image is better than two pieces, it is welcomed by domestic and foreign astronomical enthusiasts.

2. Reasonably choose the focal length of the astronomical Telescope

Choosing the focal length of a astronomical Telescope is related to the celestial body you want to observe.If you want to observe the nebula and find a comet, choose a short focus distance astronomical Telescope; if you want to observe the moon and the planet, choose the Changjiao astronomical Telescope; if you want to observe the two stars, gathering stars, changing stars, and star groups, it is best to choose a medium focus astronomy astronomytelescope.Mid -focus mirrors can take both ends, which are more popular.Usually short mirrors refer to the ratio of the focal length and caliber than or equal to 6, and the long mirror refers to the ratio of the focal length to the caliber than 15, which is called the mid -focal length mirror between the two.

3. Is the astronomical Telescope lens high and the high multiples are high?

According to the experience of long -term observation of astronomers, the maximum magnification of the astronomical Telescope must not be greater than the diameter of the 1.5 times (represented by millimeters). The Telescope with a caliber of 100 mm is observed.Times.The best tranquility can reach 190 times; when the caliber is 200 mm, it is observed in a medium of atmospheric tranquility, and it must not be greater than 170 times.At the best tranquility, it can reach 340 times; in fact, the maximum magnification of the bright celestial bodies can be doubled for astronomy enthusiasts, and even the caliber of the 2.5 times mirror (represented by millimeters).However, the multiples of the astronomical Telescope make the image bigger and darker, and at the same time, the atmospheric jitter has also enlarged, making the image more blurred.

4. Choose as much as possible astronomical Telescope

1) Large diameter, there are many light energy received, and you can observe a darker celestial body.

2) Large caliber, maximum effective magnification V is large, because V = main mirror diameter D (represented by millimeters).

3) Large diameter and high resolution. You can observe more details of the planet, you can distinguish the double stars, and it is possible to find darker asteroids and comets.In terms of resolution theory, it is only related to the caliber, which is actually related to optical design, processing and installation, and schools.Generally, the resolution of the popular science Telescope can reach 2 times the theoretical distinguishing angle, even if it is a high -quality Telescope, and the BOSMA1800150 is tested by the import metering instrument, the resolution is better than 1 , which is close to the theoretical value.

5. How to distinguish the optical quality of the astronomical Telescope

When buying during the day, you can observe a building in the distance with an astronomical Telescope to move the outline of the building to 1/4 of the vision. If the outline orange or blue -purple is particularly obvious, or the contour line is bent particularly, don't buy it.; Look at the leaves in the distance. Generally speaking, the 60 mm caliber Telescope can see the leaf tendons at 40 meters away. Don't buy it if you can't see it clearly.Of course, the larger the diameter of the astronomical Telescope, the farther it looks.Bosma70060 astronomical Telescope (caliber 60 mm) can see the leaf tendons outside 85 meters.In the evening, you can watch the stars. If you see the stars with color and particularly obvious, or the stars on the edge of the field of vision drag your tail, the length of the star is twice the size of the star. This astronomical Telescope is not suitable for astronomical observation.

6. Detection of resolution of astronomical Telescope

The best way is to observe the double stars.For example: Tiaoya star is double star (near the cowherd star), the angle distance is 1 .4; Aries star is double star, corner distance 1 .The husband's star is a double star, with a corner distance of 3 .

7. Observation about planets

Observe the magnification of gold, wood, water, fire, and Saturn is the planetary small round face in the astronomical Telescope viewing field and the full moon seen by the naked eye.Therefore, it can be observed by observing Jupiter with a 50mm objective mirror. Venus and Mars can be observed with 80mm objective mirrors, and Mercury uses a 280mm objective mirror.

8. Observation about the sun sunspots

Big Kuroko can be seen with a small astronomical Telescope, while some small sunspots need to use a large astronomical Telescope to see clearly.Amateur observations generally use projection observations.Observe that the sun and the moon should use a Telescope with a caliber (D/F), it is best to be 1: 15-1: 20.You can also add a light bar in front of the mirror to reduce the caliber ratio.However, doing so will reduce the discrimination of the Telescope.

9. Observation about the moon

The moon has ring -shaped mountains, chain mountains, Yuehai, Moon Valley, grooves (dry rivers) and bright radiation stripes. A good astronomical Telescope can see very subtle details on the moon.The best magnification of the moon is (1 1.5) main mirror caliber (MM).

10. Scholar about astronomical Telescope

The stands of astronomical Telescope have two types: horizon and equatorial type, all of which have two vertical shafts.The vision of the astronomical Telescope is generally relatively small, and the larger the magnifying rate, the smaller the field of vision, so choose a bracket that will not shake due to wind blowing.

What is polarizing mirror

The word "polarizing light" comes from physics. The reflection on the non -metal surface of glass and water surface is polarized light, and the clear blue sky is also polarized in the scattered light in the direction of 90 with the sun.These Lights need to be avoided, eliminating polarizing light, which can make the color of the sky deeper and effectively reduce the impact of glare on photos.The polarizing mirror uses the grating principle to eliminate polarized light at a certain angle.Here you need to pay attention to the angle of shooting. When the backlight or Smooth light shooting, the role of polarizing mirror is limited, and it must be a certain angle with the light source and reflector.

What is the role of polarizing mirror

The photos can look more transparent and the color is brighter.It can also be darkened in the sky, eliminate reflection, and it is very useful when shooting water flow and glass.Polarized mirror can also play a role in blocking light, which can reduce the shutter speed.To understand the use of polarizers, you need to master certain theoretical knowledge.

When shooting the scenery, the polarizing mirror is very useful, especially when the sky is dark, it can make the color of the blue sky more saturated, while highlighting the clouds in the sky.However, the material must be reversed. Do not use polarizing mirrors too much, such as the reflection of the leaves and grass is also polarizing light. These reflectives are conducive to expressing details and layers. If these Lights are eliminated, the screen will be overwhelmed and there is no level.

The greater use of polarizing mirrors is to eliminate reflection, such as the reflection of the water surface and glass window.In this way, you can shoot more details, such as things in the window, or rocks and water plants in the water.And polarizing mirrors can reduce the amount of light in the lens, slow down the shutter speed, and play the effect of similar to the medium -density mirror.

Polaries are divided into two types: linear polarizing mirror (LPL) and circular polarizing mirror (CPL). The former is mainly used for old -fashioned manual cameras because it interferes with automatic exposure and camera light metering system.Most of the polarizing mirrors on the market are CPL. When buying, choose a ultra -thin Polarized mirror when using a wide -angle lens to shoot according to your own lens caliber, so as not to occur to avoid dark corners.

When shooting the scenery, learning and using a circular polarizing mirror will have an immediate effect, making your photos refreshing.

How to use Polarized mirror

1. The brightness of the dark sky

By rotating the lens, the many partial vibrations in the roof reflection can weaken the intensity of light in the sky, darke the sky, and increase the contrast between the blue sky and the white clouds, making the sky blue and the clouds whiter.It should be noted that the CPL mirror does not affect the color of the light.

2. Eliminate the reflection on the surface of water, glass and metal

When the light is projected to the plane objects, such as water, glass, paint furniture, etc., it usually produces a strong SLR reflex light, which will become a high light point in the photography screen.This highlight point will affect the shooting effect. At this time, if you use the CPL mirror for shooting, you can improve the picture quality of the photo and improve the clarity of the picture.With the CPL, the previous reflective water surface does not affect your shooting. You can take more clearly to the fish in the water; add CPL, the previous reflective glass window will not affect your shooting. You can shoot more clearly.The exhibits furnished in the glass window; add CPL, the previous reflective window will not affect your shooting. You can shoot the charming scenery outside the car window from the car.

3. Replacement neutral gray filter

CPL mirrors can reduce exposure 1-2 gears, which can replace the role of medium gray mirror.Under certain needs, 1 or 2nd exposure can be reduced.

Many photography enthusiasts know that using polarizers can make the blue sky blue and eliminate reflection on the surface of glass, water and metal, but in fact, the polarizing mirror has more effects.When shooting in cloudy weather, polarizers also have obvious effects.Although it does not turn the gray sky at this time, it can make the color stronger by removing the reflection on the surface.For example, shooting the leaves of plants, the surface of the glass and the slippery stones of the plant in cloudy weather will reflect some light from the gray sky.These reflection obviously fade the color.Add a Polarized mirror in front of the camera. Slowly turning the front lens, you will find that the leaves of the plant have thickened the leaf surface.installation and non -mirroring are shot the same scene, you will find a very obvious difference in the photos you shoot.In cloudy weather, the effect of increased color saturation through polarizing mirrors is as obvious as eliminating reflection.

When using a polarizer, just set it in front of your lens, watch the front lens of the Polarized mirror at the same time through the viewfinder, until the result of satisfactory, then you can press the shutter to focus and adjust the layout of the screen.Press the shutter.

However, some photographers who use polarized mirrors for the first time said that they could not observe any changes when rotating polarizers. This is because the polarization mirror has the best effect when the light is in the direction of the light and the axis of the lens is 90 degrees.If you shoot against the sun, or face the light source (sunset), the Polarized mirror will not have any effect.But if the light comes from your left or right, or directly from the top of the head (the sunlight at noon, cloudy weather), the Polarized mirror will magically eliminate the reflex, the dark blue sky and improve the color saturation.

Disclaimer: The above method stems from the index of the program system or the sharing of netizens. It is for your reference only and does not represent the research perspective of this website. It proves that it is valid. Please pay attention to the authenticity and authority of the source of the content of the content.Apply to delete & gt; & gt; error correction & gt; & gt;

[GPS Technology] The main key technology of GPS chip is the three generations of GPS chips 9 major knowledge

With the development of science and technology, the development of GPS navigation is increasingly worth looking forward to, and the development of the core technology of GPS chip is the most worthy of our concern.In the process of the development of GPS chips, "miniaturization" has always been an important development direction, which has led the GPS chipset to reduce power consumption and reduce volume.The system can provide detailed and accurate positioning information and traffic information, which can easily achieve the CPS satellite navigation function.

In recent years, due to the increase in chip manufacturers and providing integrity solutions, module manufacturers are more likely to develop integrated products. Therefore, a large number of manufacturers have invested in the production of receiver products.The effect of helping the GPS boom has also caused the price of GPS chips with the highest cost of GPS machine costs, and the GPS chip used to provide consumer electronics products has also begun to show their figures. In addition, chip manufacturers have gradually improved their performance performanceTherefore, the chip positioning ability has gradually closer.Under this trend, how GPS chip products win the affirmation of buyers, and have become the key factor in competing with each GPS chip in the market.

Speaking of the main key technologies of GPS chips, this includes responsible signal processing -base frequency (Baseband) and receiving signal -RF (RF).Since the GPS signal frequency (1575.42MHz) comes from a high altitude of 20,000 kilometers from the ground, the signal is very unstable, so the antenna receiving signal has been enlarged, filtered noise, frequency reduction, and sampling (RFFRORONT END) after the antenna receiving signal, and then passes throughAfter RF, the signal enters the base frequency processing section, and the digital signal sampled in the previous paragraph is calculated and output to facilitate the use of user interfaces. Among them, the GPS Baseband DSP chip is the core component, which is responsible for processing the address signal.

Based on the above, the two parts of RF and the base frequency include micro -processor Microprocessar, low noise amplifier (LNA), digital ections, RF Section, antenna Ele -Ment.), Output into several important components of the drive (GPI andDrivers) and the PRO -CESSOR PERIPHERALS.The integration of various GPS chip solutions on the market makes the GPS chip market is facing great variables.The first is "miniaturization". Looking back at the development history of GPS chips in recent years, with the combination of GPS and other products, and emphasizing that the volume of the terminal product is light and short, the GPS chip direction of the system single chipization of the system is an inevitable trend.At present, manufacturers can divide radio frequency or base frequency single chips for GPS single -chipization, and integrate more functionality.In the RF chip part, many manufacturers have integrated amplifier, filter, frequency reduction, frequency synthesizer and oscillator;Flash), power management time clock, etc.

Therefore, we see that the size of the GPS chip has gradually narrowed, and the GPS chip has developed from a dual module to a single module. In the future, GPS equipment products will become more and more vigorous, and chip demand will become greater.In addition, GPS chips will also face customer -based demand. In the past, most GPS chips were in the automotive market.At present, GPS chip applications have begun to be used in mobile phones and PDAs, or special personal carrying devices, such as the tracker for the elderly and children.The GPS chip may also be integrated with other functions, such as Bluetooth, USB, etc.Therefore, more and more customized modules designed for special applications will also be increasing.At present, most of the global investment in GPS chip development is mostly with foreign manufacturers, such as Sirf, Ti, XEMICS, FreeScalc, STM and other large manufacturers have launched GPS chips. Among them, Sirf is the world's largest GPS chip manufacturer. The product line is quite complete and can provide a full range of series.Solution product.

GPSKnowledge descriptionGPS"Three -generation chip" knowledge

Recently, in GPS products, the so -called "three -generation chips" are often mentioned.However, neither merchants and users have clearly explained and understand, and even misleading and misunderstanding.Exchange your own experience and views with you.

1. GPS chip: There are currently three main chips on the international (common/more popular) GPS module (common/more popular) GPS module (common/more popular) GPS module (OEM board).

(1) American SIRF (SIRF)

(2) Sony (Sony Ericsson/Sony Ericsson) chip

(3) Swiss Nenem NEMERIX chip

2. The core of the third -generation chip:

The chip hardware is similar, but internal software plays a main role.The so -called core technology of the three generations is only to improve the software algorithm on the basis of the 2nd generation. It is like the formula for calculating the acceleration/speed in the primary and high school physics classes, but in the university's higher mathematics, the number of guides and points in the university to calculate the same acceleration/The physical problems (algorithms) of speed are different. The time used is very different. It reflects the difference between middle school and university, just like the 2nd and 3rd generations.The second is that the hardware also provides quality standards.

3. The main function of the three -generation chip software:

3 generations of chip software improvement upgrade: (1) Algorithm improvement improves the stars/positioning speed time.(2) Improve anti -interference performance, signal -to -noise ratio, and receive effective star numbers through software filters.(3) Some chip implementation software DR trace (rotation) calculation, improving anti -high -rise buildings, shade, underpass cover and tunnel function.(4) soft channel search, search to increase the number of channels for visual satellites (12-24), and can continue to position when personnel, vehicles, uphill, and posture changes, airplanes, and Ship star calendars changes.

4. Three -generation chip hardware improvement:

(1) The power consumption of the chip is reduced and the volume is reduced (compared with the 2nd generation).

(2) Improve anti -interference capacity, full shielding or dual chip separation.

5. GPS module and product:

gpsgpsEven wires, connectors, etc. look irrelevant components).

6, antenna is an important factor:

GPS antennas must be used in common GPS products such as handheld, PDA, Bluetooth, G-MOUSE, etc., regardless of active, passive, or even omniscient antenna, more than a dozen performance indicators, angle (except for 1600 maximum full antenna), DB of amplifiers, impedance range, material, anti-interference ability and module matching determine the performance of the entire product, and even 2-3 antennas (above and bottom) on the aircraft.position.In other words, the 3 -generation module is very good, and the antenna may not match the 2nd generation products.

7, number of channels:

Three stars are two-dimensional, 4 stars are three-dimensional positioning. This is the basic principle of GPS. We use 11-12 pieces on the ground (because the antenna is 160 degrees angle).) You can collect a few more (must be omnidirectional or more or more antennas), but it also takes 3-4 of the 3-4 signal and the nearest effective satellite for calculation positioning.Four channel positioning, a channel quickly search for all visual satellites, and compared with 4 of the effective stars, it is replaced by one of them, so that 4 strongest signal satellites are maintained.Therefore, the higher the passage, the better, the generally 12 are enough. What 16, 18, 20, 24 ... are soft channels, which reflect the number of visible satellites that can be searched for viewing satellites. It has no practical significance.

8. Induction (DB number):

The degree of induction of GPS receiving signal (-150-195DB) The standards of each manufacturer are not uniform, some are modules, some are modules contain antenna, some are the average, some are peaks (maximum value).Everyone's actual environment (electric field, magnetic field, high-voltage, microwave, geomagnetic ...) is very different. Therefore, the difference between this indicator is 3-5DB, which is not related to the order of order, but it is probably a approximate reference.

9. The obvious advantages of third -generation products (actual effects):

As long as the user needs to understand the specific technical indicators of the three -generation chip, it is more important to observe whether there is the following characteristics.

(1) Fast positioning time: Regardless of the cold start, Wen Qi, and the heat, the re-capture time is almost 5-30 seconds (compared to the second generation). In fact, most users are not worse than these ten seconds.

(2) High sensitivity: that is, in high -rise buildings, shade, underpass, cover files, Suidong, windows, cars, and even under the chassis of the car, you can quickly position more than 4 satellites.It is often said that it can be positioned a bit (single -star positioning), that is, "Give some Sunshine".

(3) Anti -interference performance: high -voltage lines, electric fields, magnetic fields, high -speed dynamics, microwaves, mobile phones, can still work properly in the environment of frequency interference.

(4) Low power consumption and power saving: reduce power consumption, and even have sleep state (static does not work), which can save power and improve product standby time.

(5) Small volume, good performance and price comparison: small volume and light weight. This is the needs and development trend of society, which can expand more application scope and field.In fact, the price of the three-generation chip should be the same as the second generation, or even lower, but the function is much improved. T-38 (16 channels, 3rd generations) 200-300 yuan/block.