[Navigation System] What are the working principles of the GBS navigation system?

[navigation System] What are the working principles of the GBS navigation system?

Common GPS navigation systems are generally divided into five forms: mobile phone, PDA, multimedia, vehicle -mounted, notebook types.With the popularity of smartphones and mobile phones of PDA functions, the first three forms have begun to cross.In addition to the products that are integrated with the CD machine mentioned earlier, the GPS that comes with the original car of many models also belongs to this type.The convenience of notebook products has been limited in terms of use. In addition to some enthusiasts, few people use it for car navigation.

Types of GPS navigation System

1. mobile phone GPS

The Nokia series mobile phone using the S60 intelligent system is a typical representative of the mobile phone GPS navigation system.A GPS signal receiving module LD-3W is connected through the Bluetooth system (other models include LD-1W, LD-4W), and navigation operations can be performed through the navigation software in the mobile phone.

In general, the mobile navigation system is easy to carry. A small module will not become a burden at all. The price is relatively low in price than many GPS products, especially when you have a S60 phone, you only need to pay more 700 yuan more.You can get detailed navigation functions on the left and right.Of course, you can also buy a 1,500 yuan S60 mobile phone after getting a module.

2. PDA -type GPS

There are many PDA mobile phones in the market now. Dopod is a major brand. It has the functions of mobile phones and the practicality of PDA, which makes many business people feel a lot of affection for such products.After all, compared with the S60 system, whether it is the PALM system and the WindowsMobile system, the various types of software supporting are richer and the product is more functional.Of course, the navigation function of such products sometimes requires the Bluetooth GPS receiving module.

Because the PDA -type GPS is placed in the fuselage in the end of the navigation system, it is best to pay attention to the position of the body at all times. It is best to always place it under the front windshield.

3. Multimedia GPS

There are also some people who call this type of product as a car GPS. It can be understood so that they have almost no other functions except for use in the car.It is also because of the single nature of this function that can make them easier and practical.

This type of GPS also has a variety of prices according to different functions. In addition to individual low-priced or high-priced models, the main product price is concentrated in the range of 3,000-5000 yuan. The GPS navigation system in this range is also the most in the market at present the market.Mainstream.

Most car owners prefer the main reason for multimedia GPSs to be simple and easy to use.

4. Vehicle GPS, Notebook GPS

There is nothing to talk about these two products. The price of GPS integrating with the head of the machine has always been high. If it is not for higher requirements for the audio and video entertainment system itself, then choosing this system is entirely chargingBig.In addition to paying a higher price when buying a car when buying a car, the later map upgrade is also very high. Generally, a DVD map disc is nearly 1,000 yuan.

And the notebook GPS is more in a state of fever and play. Although the notebook is already small, it still cannot be fixed by a suction cup just as other products. Holding a 10 -inch guy on the car for navigation as a navigation on the car for navigation.It is not easy. It is more suitable for GPS enthusiasts to test, modify or software trials of homemade maps.

navigation system work principle

1. Orientation correction

1. Positioning

Find the location and rely on the synthetic positioning method.The method is to turn the route unit continuously with the quantity and angle.This process includes the accumulation of errors, but these errors are constantly compensated with the position of the digital map (map matching).Due to the GPS satellite positioning system, the vehicle is beyond the short -distance travel of the digital road network or after the shipping or railway transportation, the navigation system can still navigate navigable navigation without any problems.

2. Sensor

In order to find positions, two wheel sensors are often used to determine the changes in the journey and direction, and the absolute direction of traveling travel is determined by the ground magnetic sensor.

In essence, when traveling outside the range of digital maps, the GPS positioning system correction large sensor interference, or determines the revision point of the storage road network.A more modern system requires only a simple travel signal. For example, it often uses speed to determine the volume control of automobile radio.The changes in the direction are determined by a partiality sensor (gyroscope).The geomagnetic sensor is superfluous, and now it can determine the absolute direction of travel through the Doppler effect from the CP signal.

2. Receive destination

1. Name address record

Digital CD map contains name address records.Therefore, the destination can be logged in as an address. All regional catalogs (towns, villages) of all CDs can be used to find the required targets, and list the names of the storage road/street in turn.In order to further find out the destination, it is possible to find the road/street crossroads or street numbers.However, the displayed house number is still very limited, because it is necessary to clarify that the data costs too much.Some drivers rarely know the address of the destination, such as airports, railway stations, service platforms, car parking lots and more places.For this reason, the classification address records the address (POIS) that these people often care about.Use these addresses to log in or even find gas stations near the vehicle.The place where the destination is marked or calls the previously stored address on the map display is further choice.

2. Travel guide

As a reasonable development of POIS, CDS is now available as a travel guide. It is the result of joint cooperation between publishing companies and digital map manufacturers.For example: These CDSs can be used to find hotels near destinations.CDS information also includes the size, price and facilities of POIS.

Third, path calculation

1. Destination selection

It must be able to adapt to the path of the driver's hope.In many systems, optimize configuration with driving time or mileage.Path computing should be noticed at certain homework, such as avoiding highways/car highways, ferry connections and toll sections.Once the destination is determined, the initial calculation of the destination must be completed in half a minute.If the driver breaks away from the recommended path, this requires the system to re -calculate the path, and it is still fast.To select the alternative path, the driver presses the button to bypass the congestion section forward.

2. Dynamic path selection

Driving automatically through the traffic blocking area automatically, you can use RDS-TMC to encode the estimation of traffic information to achieve.This information can be received by RDS or GSM.

Fourth, path guidance

1. Decision of the path

Path guidance is achieved by comparing the current position of the vehicle to the path calculated by the computer.After a comprehensive analysis of the existing sections and the path that will continue to drive, the system can determine whether the driver must change the direction, or continue to follow the current road.

2. Recommend path and direction

Proposal and guidance in paths and directions are the first and first prompts.This allows the driver to run according to the prompt without affecting its operation.If it is possible in the scope (instrument panel) of the Lord, a simple graphic display is installed, and the driver can better grasp the direction.The conciseness of the sound and graphical indicator direction is the decisive factor of the quality of the path guidance.It is not the first choice to determine the driving direction from the display map, because it will disperse the driver's attention.

3. Dynamic path

Transportation blocking is automatically detoured by the traffic information code.This information code is silent in the traffic information channel (RDS-TMC) of the radio data system and is published parallel to the radio program.They have been included in the GSM service.

Five, map display

According to the design of the system, the map can be displayed with color monitors, and the map ratio is between 1: 8000 and 1: 16X10.Observe adjacent or farther routes according to the graphic ratio.The driver's orientation is based on the support of the background information of topography. They show that such as lakes, rivers, ditches, high -rise areas, railways and forests.

Six, road map storage

CD-ROM has become the main media of the storage road map.The storage structure of the data is the proprietary technology (confidential) of the manufacturer and significantly affect the performance of the system.For this reason, the current CDS on the market is a system of different manufacturers and is not compatible with each other.We are trying to standardize navigation CDS.

Due to the development of the digital region, the integrity of the road network and the increasing increase of additional information resources, the capacity of the CD-ROM (seemingly so huge) in the foreseeable future will be consumed.Digital universal CD (DVD), its capacity is much more than CD-ROM, and will definitely become its successor.& gt; & gt; GPS navigator ten brands