So, in the transmission of wireless video data, what wireless technologies are used in the field of vehicle monitoring? It should be said that there are many technologies that can be used for wireless transmission of data.
According to the reporter's understanding, in general, depending on the type of data transmitted, it can be roughly divided into two categories. These two types of wireless transmission technologies are widely used in the field of vehicle security monitoring. One is the audio and video and pictures for vehicle monitoring. (such as car DVR, car NVR capture video screenshots), vehicle sensing devices and satellite positioning data to provide wireless transmission technology; second is to provide satellite positioning wireless transmission technology for vehicles. The wireless transmission technologies used by the former are usually 4G (TD-LTE, FDD-LTE), 3G (WCDMA, EVDO, TD-SCDMA due to low rate, very little application in actual projects), 2.75G (GSM) and WI -FI (802.11a/g/n/ac); the latter wireless transmission mode is usually GPS in the United States, China's BDS (ie Beidou satellite navigation system), Europe's GALILEO and Russia's GLONASS, which are widely used in China. Usually GPS and BDS (for the latter wireless positioning technology is not discussed in this article).
It should be said that wireless transmission technology that can be applied to on-board security monitoring also includes technologies such as Bluetooth and microwave, but these technologies are relatively less used in vehicle monitoring.
At present, in the car video surveillance, the widely used wireless transmission technologies are 3G (CDMA2000, WCDMA, TD-SCDMA), 4G (TD-LTE and FDD-LTE), and WI-FI.
According to industry insiders, the car wireless video transmission technology before 2008 is still in the era of 2G GSM and CDMA 1X. Due to the slow speed of wireless transmission technology, in most cases, only some lower resolution pictures can be transmitted. It was not until 2008 that 3G networks (CDMA2000, WCDMA, and TD-WCDMA) were used for car-mounted wireless video transmission. However, in the actual wireless video transmission process, due to the limited bandwidth of the wireless base station, the real-time transmission effect of images often follows the customer's The demand is very different. In addition, due to the high cost, the use of 3G technology for wireless video transmission is relatively rare. After 2008, wireless video transmission using WI-FI and COFDM technology has developed rapidly, but both have their own Limitations, such as COFDM.
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