Because of the development of modern technology and people's life needs, the sensitivity requirements of GPS locator receivers are gradually increasing. After all, when the locator is embedded with a receiver with higher sensitivity, whether it is under a tall building or a narrow street, it will be in Obtain time ephemeris and positioning information in the shortest time, greatly reducing the time consumption of cold start and warm start.
For the overall performance of the GPS locator, the receiver sensitivity is a very important core reference index. Every positioning module manufacturer and R&D company will treat the receiver's sensitivity as the computing efficiency of the mobile phone CPU. How important this is. The sensitivity of the receiver is mainly divided into three categories, the first category is the acquisition sensitivity, the second category is the tracking sensitivity, and the third category is the initial startup sensitivity. The sensitivity of the most commonly used locator receiver is usually controlled at -160dBm, while the receiver The initial start-up sensitivity value and capture sensitivity value are below -142dBm and -148dBm.
When using the car locator for the first time, we will connect the car locator to the car power supply, then the GPS locator receiver will start working, it mainly captures the satellite signal, and starts when the satellite signal is captured Reduce work energy consumption, track satellite signals, and monitor vehicle driving routes in real time. In addition to positioning information, other types of locators will also receive and push GPS short texts and update timing data. Such as handheld positioning terminal, drone mapping positioning system, etc.
From the perspective of the working system and process of the GPS positioning system, the signal path, noise parameters and communication baseband algorithm of the front end of the locator receiver will affect the various sensitivity of the receiver. For noise parameters, it is best to optimize the G/T value of the system In this way, the noise figure can be gradually reduced. Of course, the gain performance of the full channel cannot be too large. Finally, the design of the communication baseband algorithm. At this point, many GPS communication baseband manufacturers and R&D companies have launched GPS baseband chips. Has been processed.