GPS's navigation application

Satellite technology can be traced back to the first generation of satellite navigation systems of maritime navigation to traced back to the 1960s. However, this satellite navigation system was originally designed mainly to serve the polar region and cannot be continuously navigation. The time interval of its positioning changes with latitude.It is above 70 degrees north and south latitude, and the average positioning interval does not exceed 30 minutes, but it takes 90 minutes near the equator. The second and third generation transit satellites launched in the 1980s Navars and Oscars make up10 to 15 minutes.In addition, it is difficult to improve the positioning accuracy (the speed of the Ship is required to accurately know the speed of the Ship), which is mainly used for 2 -dimensional voyage.

The emergence of the GPS system overcomes the limitations of the Transit system, not only high accuracy, continuous navigation, and strong anti -interference capabilities; it can also provide seven -dimensional space -time position speed information.In the initial experimental navigation equipment test, GPS showed that it could replace the TRANSIT and roadbirth radio navigation systems, and played the epoch -making role in navigation navigation.It is difficult to imagine which Ship is not equipped with GPS navigation systems and equipment. navigation applications have become the largest users of GPS navigation applications. This is difficult to compare with users in any other field.

There are many GPS navigation users, and their classification standards are also different. If they are divided according to the type of route, GPS navigation navigation can be divided into five categories: ocean navigation; coastal navigation; port navigation; inland river navigation; lake navigation.

Different stages or regions also have different environmental requirements for navigation safety, but they are to ensure the minimum navigation traffic conflict, and the most effective use of the increasingly crowded routes, ensuring sailing safety, improving transportation benefits, and saving energy.There are roughly the following categories according to the function of the navigation system:

1. Autonomous navigation

The independent navigation system is suitable for any of the above five routes. It is basically a simple navigation system. Its main feature is to provide users with location, speed, flight direction and time information., No communication system.It is adapted to a Ship that sails on any sea, lakes, and inland, from large ocean cargo ships to private yachts.

2. Port management and guidance of entering the port

This system is mainly used for Ship scheduling management at port/pier and guidance to Hong Kong ships to ensure the safety and order of voyage of ports/pier.The system requires two -way data/phonetic communication to facilitate the leader to guide the Ship; the context/sea map of the port area shows that the mooring ships and the available port routes are avoided to avoid collision.This system requires high accuracy of navigation systems, and uses differential GPS and other enhanced technologies.

3. route traffic management system

This type of system is similar to 2, but it is mainly used for Ship navigation and management on the offshore and inland river routes, and usually requires support of satellite communication systems, such as Inmarsat.

4. Tracking the surveillance system

Such systems are mainly used for maritime patrol boats, anti -smuggling and various yachts, especially private yachts to prevent theft.According to the specific use objects, some systems need to give navigation parameters and two -way data/phonetic communication, such as anti -smuggling boats.Sometimes there is no need to give navigation parameters. For private yacht anti -theft, only one -way data communication is required. Once theft occurs, the navigation system on the yacht continues to send its own position and to the relevant center in order to track it.

5. Emergency rescue system

The system also includes amphibious aircraft, helicopters and land vehicles.It is suitable for all five types of routes to search and rescue all kinds of sea, lakes, and inland risks, dangerous ships and people.This type of system requires two -way data/phonetic communication, which requires fast response time and high positioning accuracy.

6. GPS/Sound combination is used for underwater robots navigation

This type of combination system can be used for underwater pipeline laying and maintenance (required visual system), hydrological measurement, and other sub -operations, such as underwater survey for port/dock, so that the channel obstruction is cleared and the channel is unobstructed.Can be used for ocean fishing, fishing boat operation guidance, etc.

7. Other applications

The navigation techniques used are mainly:

GPS (GNSS);

Sound technology;

INS;

navigation

Radio navigation technology;

Image matching technology;

Other technologies.

The main communication technology adopted is:

FM and TV sub -carrier unidirectional data/speaking communication;

By -way data communication of the benchmark network;

Cluster communication;

Honeycomb communication;

Land mobile digital communication;

Satellite mobile communication;

Drives of traffic.

The first five communication technologies are mainly used for offshore, inland and lake areas.

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sports and casual shoes maintenance method Daquan

one,Leather sneakers

sneakers made of sheep, cowhide, pork Skin and other livestock Skin are leather sneakers. They are rich in breathability and ductility, and they are also very comfortable to wear.But the disadvantage of this shoe is obvious: you cannot touch the water, are afraid of humidity, and high prices.

cleaning method:

1Then, thenUse a shoe brush to brush the dust on the upper, then dip a little shoe oil or other leather cleaner gently to gently wipe the upper. It is difficult to remove stains.If there is no leather cleaning and care agent, you can use your conditioner, you can make the shoes shine from the dim light without light.~

2Then, thenUse a toothbrush to dip the inside of the shower gel or toothpaste to remove the odor, spots and stains inside.

Note:

Wearing leather sneakers, do not wear it when it rains, and damage the shoes a lot.When cleaning, it is best not to use water. Sprinkle water and dry immediately.If you have to go out on rainy days, you can spray waterproof spray on the shoes, which can greatly extend the life of the shoes.

Second, natural fiber or synthetic fiber natural leather sports casual shoes

1. Wet the sneakers first, and then use "leather shoes Shampoo" and soft hair brush to wash stains with "leather shoes Shampoo" and dry brush.Direct irradiation.

2. Because natural leather dyed, the color may be dyed to the fiber, so you should be particularly careful when cleaning the seam position of the two.

3. cleaning of casual shoe insoles (inner bottom)

1. Basically try to avoid cleaning the insole.If there is a odor, you can remove the insoles and place it in the air circulation, and even use shoe deodorant to remove the odor.

2. If the situation is bad, rinse the insoles under the faucet and wipe it gently with a soft brush. Do not use any cleaner, otherwise the fabric fabric may fall off.

3. Dry placed in the air circulation. Do not use hot air bans or hair dryers to force the insoles with a hair dryer, otherwise the insoles may be deformed.

Fourth, sports shoes are treated immediately after rainwater

1. Use a dry cloth to completely dry the water.

2. Use dry cloth or paper to plug in the shoe in the shoe.

3. Dry placed in the air circulation

4. Do not use a hot fan or dry hair dryer to force the sports shoes with a hair dryer.

Five, suede or up fur

1. Carefully use soft hair or nylon brush to clear the dirt with adhesion upper upper according to Mao Shun.If necessary, you can dip the brush for a small amount of "suede or a fur cleaner" and then clean the upper.

2. Dry naturally after stabilizing the shoe type to avoid direct sunlight.

Six, slide leather

1. First use a clean soft cloth (best white) to dip a small amount of "leather shoes Cleaner" in leather shoe cleaner, and wipe it lightly on the upper to remove dirt.

2. Use another clean soft cloth to evenly apply the appropriate amount of "Leather Care Ointment" to the upper uniformly (just apply a layer of thinly, avoid too much weight, or wipe the excessive ointment with cloth),Plim the Skin surface.

3. If stubborn stubborn (such as oil stains), you can wet the staining part (not all sneakers) first, and then use "leather shoes Shampoo" and soft brush to clear the stains, and the soft brush is cleared.Then print it with cloth or thick paper towels to dry the shoe shape and air dry naturally to avoid direct sunlight.

Seven, natural fiber or synthetic fiber sports shoes

Wet sneakers, clean the stains with "shoes shoes Shampoo" and soft hair brush. After the water is overwhelmed, it is printed with cloth or thick paper towels. After stabilizing the shoe type, it is naturally dry, but avoid direct sunlight.

8. Artificial leather sports leisure shoes

1. Try the clean soft cloth (best white) to quickly clean the upper.

2. If the effect is not satisfactory, you can use a small amount of cleaning a small amount of cleaning agent to clean the upper.

3. If the sneakers are too dirty, you can soak the full sneakers. Use "shoes Shampoo" and soft brush to clean the stains.Dry naturally, avoid direct sunlight.

4. Use a clean soft cloth to evenly apply the appropriate amount of "leather care ointment" to the upper, and then brighten the upper.

What do I need to bring for the first time in hot springs

1. Water and drinks have more moisture content. Generally speaking, the water temperature of hot springs is relatively high, and hot springs can easily lose water in the body and easily cause dehydration.Note that even if you replenish water.

2. You need to bring a washing supplies, bring a big bath towel with a small towel, and have a pair of non -slip slippers. Generally, slippers will also provide slippers, but you still feel that you bring it cleaner!You can also prepare a sealing waterproof bag and a mobile phone waterproof cover, which can put clothes and glasses.

3. Finally, bring some items such as a Swimsuit. The water temperature of the Hot spring is easy to destroy the elasticity of the Swimsuit. Try not to buy too expensive Swimsuits, otherwise it will be distressed!

4. mask.Apply the mask to soak in the Hot spring, which is very beautiful.

5. It is best to bring some food. You can add some food when you rest in the middle of the Hot spring.

What kind of items should girls bring in hot springs for girls

Equipment points: neutral alkaline

Hot spring water is very warm, bubbles can reduce inflammation and sterilize.However, most of the Hot spring water contains sulfur, and there are many minerals, which are often alkaline, so it will not be as Smooth as you think after drying it, and it will be a little astringent.At this time, you need some care products that can balance the pH. The pores are opened, and the wiping is just turned into a bath beauty.

Equipment 1: body milk

This must be brought, otherwise it is a pity to keep the dry body after the Hot spring.In addition to body milk, you can even bring a bottle of "oil". Applying it on the body will form a film. It is good for the Skin. Even if it is not applied, it is excellent to massage the elbow joint or heel.

Equipment 2: Washing -free moisturizing milk

Try not to let your hair run into Hot spring water, it will be more astringent, but it is inevitable, so even if you use moisturizing milk after washing, you will "knot" together.Bring a bottle of laundry -free moisturizing milk. Apply a little before combing, it will be unusually Smooth and easy to sort out.

1. Can Sunscreen masks be the coronary virus?

Sunscreen masks cannot prevent the new coronary virus, because the droplets attached to the new crown virus are very small.

If you just wear a Sunscreen mask, the droplet will still transmit the new crown virus through the Sunscreen mask, so you must wear the most effective mask to prevent the new crown virus in order to reduce the risk of infection with the new crown virus.

It is generally recommended to wear medical surgical masks and N95 masks, which can effectively filter new coronal viruses.It should be noted that the mask cannot be used for a long time, because the longer the mask is used, the higher the chance of the mask is contaminated, so it needs to be replaced regularly, especially the disposable medical surgical mask. It is generally recommended to replace every 4 hours every 4 hours.Essence

2. Can Sunscreen masks replace medical masks?

No, Sunscreen masks are not medical masks, which can only be used for daily protection.The Sunscreen mask on the market is mainly textile fabrics. Because the material, craftsmanship and medical protective masks are different, it cannot be used instead of medical masks.Ordinary Sunscreen masks do not consider indicators such as filtering efficiency. They only consider the basic physical and chemical performance of the fabric and cannot have anti -virus or medical protection functions.

Most of the so -called "antibacterial" masks have added other tidal agents. These antibacterial tidal agents are harmful to the human body and have not been scientifically evaluated and demonstrated. It is not recommended that you try it.

What kind of material is professional yoga cushion?

yoga Cushion Buy Questions and Answers

First problem

The advantages of the TPE cushion, light quality, easy to carry, easy to clean, dry and wet and dry non -slip, and the cushion has no smell if the material is highly purified.Most of the pads of PVC foaming are a bit flavored due to craftsmanship and cost, which cannot be removed.Even if some products have no taste, it does not mean that its ingredients change or some harmful substances do not exist, unless the export product standards have been tested.

Of course, this issue is just some of my personal views. A friend of a foundry told me that some manufacturers added some fragrance or something to remove the taste of the cushion.

Second problem

Regarding the non -slip properties of the PVC cushion, because of the problem of the product material itself, the non -slip performance of this product can only be excellent in the case of drying. When it encounters sweating, it will no longer work when you see the water.

Here we need to remind you that this is not a brand problem, but the material of the PVC cushion itself.So there was a former MM that told me that I accidentally sprinkled some water on the cushion and was slippery, and almost let me lose her losses.Of course this is a joke.

Third issue

Regarding the elasticity of the cushion.Of course, this problem is not that the PVC cushion cannot be done. In the early Cezba, Ivana's PVC cushion was very good, but the low-end domestic ones (I refer to products between 30-70) cushions?Return elasticity is not very optimistic.Of course, some people say that this is a penny and a penny, maybe.

Many people have experienced in the yoga Pavilion. A cushion stepped on a big foot epilepsy. It could not be recovered for a long time, Kneeling, or doing some joints to touch the ground.Therefore, some friends have repeatedly emphasized which cushion is too thin and thicker.In fact, this is a misunderstanding.

Fourth question

Is the 6mm cushion really thin? In fact, in our use, the cushion with good elasticity, such as the cushion of TPE is 4mm, 5mm, and 6mm.Because of its moderate softness and can quickly rebound, there is no feeling.So if you feel very thin if you feel the 6mm PVC cushion, look at its return elasticity.If you really choose a 8mm cushion with poor elasticity, what will it feel like?

After using the 8mm pads with poor elasticity, you will feel like you have stepped on a cotton under your feet, especially for friends who are initially practiced, the sense of balance is not strong. If you use such a cushion, you will be more inferior to inferiority.I always thought I was too stupid.In fact, the cushion is too thick, too soft, and the return elasticity is too poor. There is not enough hardness to support the body's balance.

What material is good for yoga cushion?

Yoga mats are paved below when practicing yoga. The type of yoga mat is generally divided into TPE foam, PVC foam, EVA, latex pads, CBR cushions, etc.

1. TPE is the highest product of Yoga mats. It does not contain chloride, does not contain metal elements. It is anti -static. Each mat is about 1200 grams, which is about 300 grams lighter than the PVC foam pad, which is more suitable for carrying.Features: soft, stickers, and grip strong -placed on any ground is more reliable.Compared with PVC -made Yoga mats, the weight is about 300 grams, and it is convenient to carry with you.

2. PVC is cheap and good. The PVC foam (PVC content 96%yoga mat is about 1500 grams) PVC is the name of a chemical raw material and a raw material.However, the PVC did not have the effect of softness and non -slip. Cushioning. Only after brewing can it produce Yoga mats and non -slip mats: PVC materials are affordable and can be bought everywhere.The quality is also guaranteed, and the cost is relatively high.

3. It is difficult to buy cloth pads. Sometimes, we see some people in yoga classes using a yoga cushion with bright colors and Arabia flying carpets. It is said that this is an Indian yoga cloth pad.This cloth pad is imported from India. After hand -made dyeing, it can be used on ordinary plastic yoga pads.The reason for this is to think that the yoga mat with plastic materials is not good in Skin, and the cloth pad is also softer. It can also be carried with you.But don't you know if the anti -slip effect of the cloth pad is ideal?

4. Latex pads are forming from the evaporation mold. It has countless pores itself. It is Smooth and Smooth due to the surface of the pores.Many mosquitoes are unwilling to approach.elasticity is excellent, does not deform, can be cleaned, and durable.It is a good material.However, the latex itself cannot prevent the oxidation process, especially when it comes to contact with ultraviolet rays, the oxidation process is faster.Moreover, latex rubber has a allergic effect, and about 8%of people will be allergic to latex

What kind of yoga is used for pregnant women

1. TPE material, does not contain chloride, does not contain metal elements, anti -static, less stimulating Skin.

2. If you choose 8mm thickness, you can also protect it if you accidentally fall.

3. When paving on the ground, it is easy to lay flat, not wrinkle, and avoid the possibility of standing unstable.

4. Strong grip and non -slip.

5. Can't be sticky.

6. Do not slip after sweating.