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03-31-2022

What is the difference between Beidou satellite positioning system and GPS positioning system?

The Beidou system and GPS positioning methods and principles are in the same line. GPS was designed in the 1970s and formed in the 1990s, while the Beidou system (the official Beidou system is the second generation of Beidou) was launched in 2004, which is actually an imitation of GPS. So it can be said that Beidou and GPS are basically the same, and they both provide location/time information for users: the user holds a navigator and analyzes the user's location by receiving GPS/Beidou satellite signals. By the way, the second generation of Beidou is passive positioning, that is, the knowledge navigator receives satellite signals and does not transmit signals to satellites, so there is no SMS function. In the specific implementation of this function, the two systems are different in many aspects, such as the signal frequency points, satellite constellations, coordinate systems, etc. mentioned by other people. However, since the two systems are both for the purpose of providing user positions, the core difference should be the difference in positioning accuracy between the two systems, and other differences, some of which are basically irrelevant (such as using different time/ The spatial coordinate system is essentially just a convention), and some are mainly reflected in the impact on positioning accuracy. Of course, the positioning accuracy is the higher the demand, the better. Then the difference between the newly developed Beidou and GPS is mainly 1) There are some things in GPS

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03-31-2022

5G transmission technology test goes further and related sectors have a good performance

Recently, Wen Ku, director of the Department of Communication Development of the Ministry of Industry and Information Technology, pointed out in his speech that 5G, as the main direction of the development of the new generation of communication technology,

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03-31-2022

(5G) Promotion Group Releases Phase 2

Recently, Wen Ku, Director of the Department of Communication Development of the Ministry of Industry and Information Technology, pointed out in his speech that 5G, as the main direction of the development of a new generation of communication technology, will become an important driving force to promote national economic and social development and promote industrial transformation and upgrading.

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03-31-2022

Will a wireless router with multiple antennas work better?

Shenzhen Aerospace Communication Antenna Manufacturer Antenna Knowledge. A strange consumption habit exists in the daily consumption behavior of most consumers. When the price is almost the same, consumers tend to choose products with "large quantity". In addition, the phenomenon of following the trend is also very serious. Many facts have not been verified by themselves, and they have taken the initiative, "I will buy whichever product is bought by more people." The most representative group are the fans of "God Car Party" and "Heavy Doors". Similarly, most consumers who buy wireless routers have also fallen into the misunderstanding of "multiple wireless signals with antennas", and blindly followed the trend, and even became "the party with only the number of antennas". Is the factor affecting wireless signals really the number of antennas? Eliminate misunderstandings, the more antennas in wireless routing, the better? Why do wireless routers have multiple antennas? Just as aunts go shopping for groceries in the supermarket, "increase the quantity without increasing the price" is the sign that attracts their attention the most. "More", "big" and "cheap" deeply affect people's desire to buy. The same is true for consumers of wireless routers. The "god logic" that "built-in antennas must be inferior to external antennas" has always had a decisive impact on consumers' consumption concepts. In order to win the favor of consumers, some wireless router manufacturers even deliberately changed the internal antenna design to the external antenna design. This is like car manufacturers curry favor with Chinese consumers, adding a "butt" to the originally beautiful hatchback and turning it into a sedan as "horrible". Eliminate misunderstandings, the more antennas in wireless routing, the better? Are so many antennas really useful? When we open the wireless router product page of the e-commerce website, we can find that among the top ten wireless router products in terms of sales, wireless routers with three or more antennas occupy more than half of the positions. This phenomenon reflects that when consumers buy wireless routers, multi-antenna (more than two) wireless routers are very popular among consumers. Of course, multiple antennas have their advantages, but if there are more than three antennas in practical applications, it is generally meaningless in home scenarios. www.hangyu-sz.com Eliminate misunderstandings, the more antennas in wireless routing, the better? The home environment is complex, and the signal cannot be transmitted directly The use environment in the general family is more complicated. Both household appliances and walls block wireless signals, so that there is almost no direct signal from the transmitter to the receiver. The wireless signals reflected and transmitted by various items in the home form a phenomenon of "multipath transmission", and the data transmitted to the receiving end by different routes will be delayed, so we intuitively feel that the network has become "stuck". Eliminate misunderstandings, the more antennas in wireless routing, the better? MIMO technology "save the world" Then there is the "MIMO" technology that saves the world. Using MIMO transmission technology requires the support of multiple antennas. The router can divide the data into multiple parts and send them from different antennas, and integrate them at the receiving end. Taking 2x2MIMO as an example, it is like two people working at the same time, which doubles the original work efficiency, increases the wireless speed and significantly improves the communication quality.

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03-31-2022

Share the influencing factors of GPS module positioning measurement design

Factors Affecting the Design of GPS Surveying Technology The GPS module field involves a wide range of fields, so the technical design of the field stage is a complex technical management issue. After a comprehensive analysis, the following factors should be considered: (1) Factors related to measuring stations: network density; network layout plan; time allocation, repeated station setting and design of overlapping points; (2) Factors related to observation satellites Number of observation satellites; satellite signal quality; pattern strength factor; satellite elevation angle; ephemeris source. (3) Factors related to the instrument, at least two receivers are used for precise relative positioning; antenna, if the design quality and stability of the antenna are not good, it will bring a series of errors; recording equipment, which can be cassette data Tape or floppy disk. (4) Logistical factors include the number of receivers and their sources and periods of use; scheduling of units at various time periods in the survey area; other field equipment, mainly performance tools and communication equipment.

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03-31-2022

The solution to the poor WIFI signal of the sharing router

Replace the antenna for the wireless WIFI router to enhance the signal The wireless network coverage is extremely small and the transmission distance is extremely short... What is the solution? Buying a wireless router for bridging is too wasteful! Replace the antenna, low-end wireless routers are all bound to the antenna and cannot be replaced! If your brain has not degenerated , If you are still curious, then you should pick up the tool to install a new antenna for the wireless router and give it a new chance. Wireless network urgently needs to expand The first floor is the large living room, the second floor is the bedroom and study, the wireless router is at the stairs on the second floor, and the bedroom and study have fixed wired network interfaces. Recently, I needed to use the wireless network in the living room on the first floor, only to find that because the wireless router is placed on the second floor, the living room on the first floor can only receive weak signals, and the normal application cannot be guaranteed. Add a feeder to the antenna end of the wireless router and extend the antenna to the first floor, so that the first floor can also access the wireless network on the basis of the original network. However, the wireless router uses a fixed antenna design (most home-grade wireless routers within 150 yuan use this design), and it is impossible to use the signal extension feeder on the antenna interface. What should I do? Remove it and weld a new antenna to it! The renovated wireless router, due to the addition of a pluggable antenna base, can replace directional antennas, sector antennas, high-gain omnidirectional antennas and other equipment according to the actual environment. The use of routers is more flexible. What materials are needed to expand the wireless network signal on the first floor before and after the renovation? To buy the wireless router antenna required for the transformation, you can't just buy one antenna like replacing the antenna for the wireless router, but you should buy a set of wireless router antenna including the antenna base and the antenna. Since the entire antenna system is replaced, if you only purchase the antenna without the antenna base, it cannot be connected to the router motherboard. The modified antenna needs to be purchased together with the base. The wireless router antenna is divided into direct connection and feeder base connection. The direct connection type is suitable for users who just want to replace the higher gain antenna on the wireless router to expand the coverage of the wireless signal. Such high-gain antennas are currently priced at 20 to 40 yuan. The feeder base type is suitable for users who need to change the wireless network coverage without moving the wireless router. If the wireless router is on the second floor, the original wireless signal mainly covers the second floor. After using the feeder base, the coverage of the wireless signal can be moved from the second floor to the first floor without moving the wireless router, which is more suitable for the author. The price of such antennas is 50 yuan to 150 yuan. How to play Tuojie? 1. Remove the old antenna First, disassemble the casing of the wireless router, and find the antenna welding port on the motherboard of the wireless router along the position of the original antenna. Since the antenna part of the wireless router is "output port + internal transmission feeder + fixed antenna", if you want to make the antenna replaceable and support feeder base type products, it needs to be transformed into "output port + internal transmission feeder + pluggable base" +pluggable antenna", so the most critical step is to replace the internal transmission feeder. So follow the original antenna feeder to find the solder joint. Use a soldering iron to solder off the root of the original antenna feeder. Although this method is troublesome, it can ensure stable signal transmission. When soldering, be careful to prevent static electricity from penetrating the chip on the motherboard of the wireless router, so use an electric soldering iron with a grounding wire. If the soldering iron does not have a ground wire, it is necessary to unplug the wire of the soldering iron for passive soldering after the soldering iron is heated. 2. Solder the new antenna After removing the original antenna, solder the new antenna to the motherboard of the wireless router. After the soldering is completed, you need to check the solder joints to see if there is a short circuit. Since the base is directly connected to the transmission feeder, it is only necessary to solder the feeder drawn from the base to the mainboard of the wireless router, and there is no need to prepare additional wires. 3. Fixed antenna base After soldering the antenna connector, then fix the antenna base. Since the original antenna base and the new antenna base may be fixed differently, you can use hot melt glue to fix the ant

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