Introduction: hidden car gps tracker, I believe everyone has heard of it, but the average person is just heard of it, it is ignorant of its working principle, however, it does not matter, Xiaobian has sorted out the working principle of hidden car gps tracker for everyone, Here is a long posture with Xiaobian ~~~~~

1. How hidden car gps tracker works - Introduction

hidden car gps tracker, full name Global Positioning System, translated as Global Positioning system, also known as Global satellite Positioning system, is a medium distance circular orbit satellite navigation system. It can provide accurate positioning, speed measurement and high-precision time standards for most of the Earth's surface. Developed and maintained by the U.S. Department of Defense, the system meets the needs of military users anywhere in the world or in near-Earth space to continuously and accurately determine three-dimensional position, three-dimensional motion, and time. The system includes 24 hidden car gps tracker satellites in space; On the ground, there are 1 main control station, 3 data injection stations, 5 monitoring stations and the hidden car gps tracker receiver as the client.

2. How hidden car gps tracker works - System composition

The hidden car gps tracker system is mainly composed of space constellation, ground monitoring and user equipment.

The hidden car gps tracker satellite constellation, ----, consists of 24 satellites, of which 21 are operational and three are standby. The 24 satellites are evenly distributed in 6 orbital planes, that is, there are 4 satellites on each orbital plane. The orbital inclination of the satellite is 55° with respect to the Earth's equatorial plane, and the right ascension of the ascending points of each orbital plane differs by 60°. The ascending Angle of the satellite on one orbital plane is 30° ahead of the corresponding satellite on the adjacent orbital plane to the west. The purpose of this arrangement is to ensure that at least four satellites can be observed anywhere in the world at any time.

The Ground monitoring part ---- consists of one main control Station (MCS), four Ground Antenna stations, and six Monitor stations.

The user device ---- is mainly a receiver for hidden car gps tracker, which is mainly used to receive signals from the hidden car gps tracker satellite and calculate the user's 3D position and time by using the transmitted information.

3. Working principle of hidden car gps tracker - Delay principle

hidden car gps tracker implements the concept of "arrival time difference" : using the precise position of each hidden car gps tracker satellite and the navigation information generated by the on-board atomic clock continuously transmitted to obtain the arrival time difference from the satellite to the receiver.

The hidden car gps tracker satellite continuously sends radio signals in the air with time and position information for the hidden car gps tracker receiver to receive. Due to the distance factor of transmission, the moment when the receiver receives the signal is delayed than the moment when the satellite sends the signal, which is usually called the delay, so the distance can also be determined by the time delay. The satellite and the receiver generate the same pseudo-random code at the same time. Once the two codes achieve time synchronization, the receiver can measure the delay. If you multiply time by the speed of light, you get distance. The figure shows the delay principle of hidden car gps tracker system.

The hidden car gps tracker system time is maintained by the cesium and rubidium atomic frequency markers of the atomic clocks on each satellite. These clocks are generally accurate to within a few nanoseconds of Universal Coordinated Time (UTC), which is maintained by the "master clock" of the naval Observatory, each with a stability of several 10-13 seconds. hidden car gps tracker satellites initially used two cesium frequency markers and two rubidium frequency markers, and later gradually changed to more rubidium frequency markers. Usually, only one frequency marker is active on each satellite at any given time.

4. How hidden car gps tracker works - how navigation works

The basic principle of the hidden car gps tracker navigation system is to measure the distance between a known location of a satellite and the user's receiver, and then combine the data of multiple satellites to know the specific location of the receiver. To achieve this, the position of the satellite can be found in the satellite ephemeris according to the time recorded by the on-board clock. The distance from the user to the satellite is obtained by recording the time it takes the satellite's signal to travel to the user and multiplying it by the speed of light (due to interference in the atmospheric ionosphere, this distance is not the true distance between the user and the satellite, but the pseudo-distance). In order to calculate the user's 3D position and receiver clock deviation, the pseudo-range measurement requires receiving signals from at least four satellites. The principle of satellite navigation is shown in the figure.

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