Union positioning method and system based on Beidou-2 satellite and Chinese ground digital television

Abstract

The invention discloses a union positioning method and a union positioning system based on a Beidou-2 satellite and a Chinese ground digital television. The method comprises the following steps of: 1, detecting a satellite signal of a Beidou-2 navigation system on a terminal receiver and determining signal strength of the satellite signal; 2, detecting a television signal in a single frequency network of the Chinese ground digital television on the terminal receiver and determining the signal strength of the television signal; 3, selecting a positioning mode according to detection results anddetermination results; 4, extracting positioning parameters from the received signals; and 5, in the selected positioning mode, acquiring a position where a target is placed according to the positioning parameters and auxiliary positioning information, and providing a time service. In the invention, by combining the Beidou-2 navigation system and the single frequency network of the Chinese grounddigital television for positioning, the selection of optimal constellation is facilitated; the positioning precision of the system is improved; by switching of various positioning modes, the flexibility and the impact resistance of the system are enhanced; moreover, seamless coverage of a positioning area is realized, and the effectiveness of the system is promoted.

Description

Technical field [0001] The invention relates to the technical field of wireless positioning, in particular to a joint positioning method and system based on a satellite navigation system and a terrestrial digital TV single frequency network. Background technique [0002] The Beidou navigation system is an independently developed and independently operated three-dimensional satellite positioning and communication system that China is implementing, and is gradually expanding into a global satellite navigation system on the basis of system networking and testing. Since 2000, China has successfully launched four "Beidou Navigation Test Satellites" and built the Beidou Navigation Test System "Beidou One" (the first generation system). Since April 2007, Beidou navigation satellites have been launched successively, forming the Beidou navigation system "Beidou II" (the second generation system). The Beidou navigation system consists of three parts: the space terminal, the ground termina...

AI Technical Summary

Problems solved by technology

[0003] Satellite positioning technology is mature and widely used, but because the satellite signal needs to be transmitted over a long distance, the strength is weak when it reaches the earth's surface, so the receiver sensitivity is very high; Moreover, in urban areas, indoors or basements where there are many reflections, obstructions and multipath effects, the accuracy of satellite positioning will drop significantly, making it difficult to complete positioning.

In addition, various factors such as the interference of the ionosphere and the Doppler effect caused by the high-speed motion of the satellite also lead to the reduction of positioning accuracy.

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