Satellite locating method

Abstract

A satellite locating method features that the ground station sends standard signals to at least 4 synchronous satellites on geostationary orbit and the signals is retransmitted to earth by said satellites, or said satellites send standard signals with time synchronous signals to earth and said signals are received at position to be measured. Based on the time differences of said signals, the longitude, latitude and the height above sea level of said position can be calculated out. Its advantages are less investment, low cost, high anti-interference power and high precision.

Description

(1).Technical field [0001] The invention belongs to the field of radio orientation, in particular to a method for positioning through the cooperation of three or more direction or position lines. (2). Background technology [0002] At present, there are mainly the following methods for global satellite positioning: Method 1. Established by the US Department of Defense DOD, it consists of 24 dedicated satellites and corresponding receivers that operate at high speed relative to the earth and are about 20,000 kilometers above the ground; Method 2 .The double-star positioning system developed by my country utilizes 2 geostationary satellites for positioning; method 3. Chinese patent application (patent application number is 95119688.1) discloses "positioning and communication system using multiple satellite constellations", using two constellations More than 6 basically geosynchronous geostationary satellites are used for positioning. These methods have the following disadvantag...

AI Technical Summary

Problems solved by technology

These methods have the following disadvantages. Method 1: ①. The system requires 24 dedicated satellites, which requires large investment, long construction period, and high operating costs; ②. The receiver needs to receive at least 4 dedicated satellite signals that are running non-stop, so it cannot be used High directivity directional antenna is easy to be interfered; ③. Due to the inevitable large orbital drift of high-speed satellites, the system positioning error is relatively large; Method 2: ①. Three-dimensional positioning of users cannot be performed; ②. Positioning signal There is a long time delay, and real-time positioning cannot be performed; ③. Each user occupies a certain satellite channel independently, and the user usage fee is high, and the system is limited by the capacity of synchronous satellite communication, and the number of users is limited; ④. Double-star positioning belongs to response Method 3: ①. It also belongs to the response type, which transmits radio waves outward and has poor confidentiality; ②. The method and equipment are complicated and costly

Images