Since the 1990s, the global GPS positioning system has been gradually applied to the civilian field. After nearly 30 years of development, the GPS positioning system has gradually introduced equipment and instruments from various industries and has been applied on a large scale, especially with the rapid development of in-car DVD navigation, car locator, unmanned driving, surveying and other technologies, GPS positioning The sensitivity requirements of the receiver of the device are also gradually increasing. After all, when the locator is embedded with a more sensitive receiver, whether it is under high-rise buildings or on narrow streets, time ephemeris and positioning information will be obtained in the shortest time, thereby greatly reducing cold start and temperature Start-up time consumption.
In terms of 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 consider the receiving sensitivity and operating efficiency of the mobile phone CPU, so we can imagine how important this is. The sensitivity of the receiver is mainly divided into three categories: one is the acquisition sensitivity, the other is the tracking sensitivity, and the third is the initial start-up sensitivity. At present, the sensitivity of the locator receiver is usually controlled at -160 dBm, and the initial start-up sensitivity and acquisition sensitivity of the receiver are both lower than -142 dBm and -148 dBm.
When we first used the hidden gps tracker for car, we connected the hidden gps tracker for car to the car power supply. When the receiver of the hidden gps tracker for car started working, it mainly captured the satellite signal. When the satellite signal was captured, it Start to reduce work energy consumption and track satellite signals to monitor the driving route of the vehicle in real time. "In addition to positioning information, other types of locators will be able to receive and push GPS short texts and update time data. Such as handheld positioning terminals, drone surveying and positioning systems, 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 to noise parameters, so it is best to optimize the G/T value of the system In order to gradually reduce the noise figure, of course, the gain performance of the entire channel cannot be too large, and finally the design of the communication baseband algorithm. Many manufacturers of positioning communication modules and GPS baseband chips introduced by R&D companies have already dealt with this problem.
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