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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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03-31-2022

SARFT’s ban expands: set-top boxes can only use domestic TVOS 1.0

Shenzhen Aerospace Communication Antenna Manufacturer Antenna Knowledge. According to the "People's Posts and Telecommunications" report, the State Administration of Press, Publication, Radio, Film and Television (hereinafter referred to as "SARFT") issued a notice recently, deciding to expand the pilot scope of the TVOS smart TV operating system among cable operators. This means that in the future, terminals such as OTT set-top boxes launched by cable operators can only install and use TVOS 1.0, and no other operating systems may be installed. It is understood that the TVOS TV operating system promoted this time is a smart TV operating system jointly developed by the State Administration of Radio, Film and Television and some R&D units. TVOS 1.0 was officially released in early June last year. Subsequently, the State Administration of Radio, Film and Television issued an order requiring the cable TV OTT box to be installed with the TVOS system. At that time, the first batch of pilots were conducted by two cable TV operators, Jiangsu Cable and Shanghai Dongfang Cable, respectively undertaking the pilot promotion tasks of 500,000 sets each. Now, the State Administration of Radio, Film and Television has expanded the scope of the pilot program, requiring that terminals such as smart TV set-top boxes purchased or integrated, developed and installed by cable TV network companies must use TVOS 1.0, and at the same time need to follow the relevant technical specifications of the NGB next-generation radio and TV network. In addition, the TVOS 1.0 system has correspondingly added an information security module to strengthen the user's information security. In addition, TVOS 1.0 also takes into account the technologies of existing operating systems, such as Linux, Android, etc. As for which operating system is more suitable for smart TV, there has been no clear unity in the industry. Although 90% of smart TVs currently use Android, more and more TV manufacturers have begun to try other options. LG said it intends to install the Web OS system it acquired on 70 percent of its TVs. Samsung has also made plans, and the next smart TV will use the Tizen system developed by itself. Under the circumstance that the TV system market has not been completely stabilized, this regulation of the State Administration of Radio, Film and Television is also for the consideration of seizing the market. However, some terminal TV companies said that TVOS 1.0 will control the applications on TVs after the full marketization, which may affect the development speed of smart TV applications.

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03-31-2022

Analysis of the fifth phase of TD-LTE centralized acquisition: small cells and multi-antennas become the focus

In April this year, China Mobile officially launched the centralized procurement of wireless network main equipment for the fifth phase of the 4G network project.

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03-31-2022

2G, 3G quit the Internet of Things! The Ministry of Industry and Information Technology issued a major document

On May 7, the Ministry of Industry and Information Technology issued the "Notice on Further Promoting the All-round Development of Mobile Internet of Things" to guide new IoT terminals to gradually withdraw from 2G or 3G networks and fully migrate to NB-IoT and 4G (LTE Cat1); ... On May 7, the Ministry of Industry and Information Technology issued the "Notice on Further Promoting the Comprehensive Development of Mobile Internet of Things" to guide new IoT terminals to gradually withdraw from 2G or 3G networks and fully migrate to NB-IoT and 4G (LTE Cat1); And it is planned to... On May 7th, the Ministry of Industry and Information Technology issued the "Notice on Further Promoting the Comprehensive Development of Mobile Internet of Things", guiding new Internet of Things terminals to gradually withdraw from 2G or 3G networks, and comprehensively to NB-IoT and 4G (LTE Cat1 ) migration; and plans to... On May 7th, the Ministry of Industry and Information Technology issued the "Notice on Further Promoting the Comprehensive Development of Mobile Internet of Things", guiding new IoT terminals to gradually withdraw from 2G or 3G networks, and fully move towards NB-IoT and 4G (LTE Cat1) migration; and plans to...

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03-15-2022

Communication System Solution

Centering on quality management, focusing on the development and application of new products, and focusing on technology training, the company's enterprise management has been perfected. The whole process from raw material procurement to product production and inspection strictly implements ISO9001 and TS16949 quality systems standard, thus ensuring the good quality of the product.

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