In the case of installing GPS in several stages, first of all, you buy a car through a loan from a financial company. Most of them will require GPS installation, and the installation cost is not low, generally ranging from 1000 to 5000. Why do financial companies install GPS when they ask for loans? The main reason is to reduce the property risk of financial companies.
If the repayment is overdue or even unable to be repaid, the financial company will locate the vehicle through GPS and detain the vehicle directly. You can continue to use the vehicle after you pay off the loan and pay a certain amount of liquidated damages, which is also the income-increasing mode of many auto finance companies.
The principle of receiving and measuring GPS signals
GPS is a passive satellite navigation system. In the passive ranging system, the distance or distance difference between the user antenna and the satellite can be measured only by receiving the navigation and positioning signals from these satellites. This kind of ranging method, in which the sending ranging signal and the receiving ranging signal are located at two different positions, is called passive ranging.
The three-dimensional position of the user antenna can be calculated by using the measured distance between the station and the satellite and the known on-orbit position of the satellite. This positioning based on passive ranging principle is called passive positioning. If the ranging signal transmitted by the transmitting device is reflected or forwarded by the reflector, the signal returns to the transmitting point and is received by its receiving device, and then the distance traveled by the ranging signal can be measured.