Dangerous goods vehicle monitoring and dispatching system is a software and hardware integrated system integrating global positioning system (GPS), geographic information system (GIS) and wireless...
The default collected GPS L1 signal is down converted to 3.996 MHz analog IF signal through RF front-end. The central frequency point of BD B1 IF is 3.996875 MHz. It is sampled to 2 bit digital IF...
The collection process of GPS data will be affected by many external factors, which will lead to errors in the quality of GPS data. The causes of these errors are mostly unavoidable, so the impact...
For C/A code, the navigation signal is composed of 25 frames of data, and each frame contains 1500 bits [2]. In addition, each frame can be divided into five groups of 300 bit sub frames. When the...
Due to the GPS_ The GPRS positioning system involves the application of GPS satellite positioning technology and GPRS general packet radio service. Therefore, in the composition of the system, GPS...
The role of the auto navigation system is to calculate the driving route by referring to the electronic map according to the current position of the vehicle provided by the GPS receiver, the vehic...
In 1994, the GPS system was basically completed, becoming a global shared spatial information resource and an important part of the spatial information system. Compared with other navigation and p...
The basic principle of GPS navigation system is to measure the distance between the known position of the satellite and the user's receiver, and then integrate the data of multiple satellites ...
1, positioning monitoring function: in the global scale, real-time continuous monitoring target, to achieve 24/7 positioning monitoring, positioning accuracy within 5 meters. 2. Electronic fence ...