Cooperative diversity positioning method based on satellite positioning system

A technology of satellite positioning system and cooperative diversity, which is applied in the field of satellite navigation and positioning, and can solve problems such as satellite positioning system not mentioned

Inactive Publication Date: 2015-12-09
PLA SECOND ARTILLERY ENGINEERING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, relevant literature and research have proposed some achievements in coding coordination, but

Method used

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  • Cooperative diversity positioning method based on satellite positioning system
  • Cooperative diversity positioning method based on satellite positioning system
  • Cooperative diversity positioning method based on satellite positioning system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0060] Embodiment: Based on the space-time cooperative diversity positioning of Alamouti code, the simulation example of processing the received signal according to the detection method of space-time coding for the user receiver (ie step 1.4)

[0061] This simulation example uses matlab to simulate the performance of BPSK (BinaryPhaseShiftKeying) modulation, space-time cooperative diversity positioning signal based on Alamouti code in Rayleigh channel. In the simulation, it is assumed that the frame length is 1500 symbols; the channel fading remains unchanged within 10 frames, and changes independently between every 10 frames; the total transmission power of each coordinated satellite is the same, and the receiver uses a single antenna for reception.

[0062] see image 3 : The bit error performance simulation curve of the space-time cooperative diversity system in Rayleigh channel is given. From image 3 It can be seen from the curve in the figure that in the same channel e...

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Abstract

The invention relates to a cooperative diversity positioning method based on a satellite positioning system. A space-time cooperative diversity positioning scheme based on an Alamouti code and MIMO-spread spectrum space diversity coding are designed according to the satellite positioning system. The method concretely comprises the steps that according to space-time cooperative diversity positioning based on the Alamouti code, adjacent satellites in the same track are grouped into satellite pairs so that adjacent satellite cooperative diversity is realized; and cooperative diversity MIMO-spread spectrum space diversity coding aiming at the satellite positioning system is designed based on an MIMO-direct sequence spread spectrum method multi-code model. Compared with methods in the prior art, the method has superiorities that signal gain is enhanced without increasing positioning signal transmitting power so that the service life of the satellites can be effectively prolonged under the premise of guaranteeing anti-interference capability; and cooperative diversity of the adjacent satellites closely combines the positioning satellite constellation characteristics, and robustness of positioning signals is enhanced without changing a space segment structure function or increasing extra burden of the satellites.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation and positioning, and relates to a cooperative diversity positioning method based on a satellite positioning system. Background technique [0002] The GPS (Global Satellite Position System) satellite navigation system adopts the code division multiple access RNSS (Radio Navigation Satellite Server) structural system. Since the end of the last century, a modernization upgrade plan has been proposed for its signal system. , the safe use of GPS users especially authorized users. Therefore, the GPS satellite navigation system has adopted some new technologies. The main measure in the space segment is to increase the transmit power of GPS satellites from 30W to 500W. Existing measures to improve the anti-jamming capability of GPS receivers include: using adaptive zeroing antennas; adding adaptive filtering to GPS receivers; directly capturing P codes; using GPS / INS (InertiaNavigationSyste...

Claims

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Application Information

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IPC IPC(8): G01S19/42
CPCG01S19/42
Inventor 何恒杨晓云慕晓冬戴精科易昭湘赵鹏张海静张伟
Owner PLA SECOND ARTILLERY ENGINEERING UNIVERSITY
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