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Method for eliminating interference signal of GPS receiver and system thereof

A GPS receiver and interference signal technology, applied in the field of satellite positioning communication, can solve the problems of losing and eliminating strong signal interference, and can not meet the requirements of orthogonality, and achieve the effect of reducing related processing power consumption

Active Publication Date: 2009-11-04
杭州中科微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, when there are more than 4 strong interference signals, this method loses the ability to eliminate strong signal interference because the local code is orthogonal to all strong signal chips.

Method used

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  • Method for eliminating interference signal of GPS receiver and system thereof
  • Method for eliminating interference signal of GPS receiver and system thereof
  • Method for eliminating interference signal of GPS receiver and system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0114] Figure 4 A block diagram of an embodiment of a related processing system for eliminating GPS interference signals in real time according to the present invention is given.

[0115]In the case of multiple strong interference signals, multiple interference signal tracking modules are selected to capture and track the multiple strong interference signals respectively. The relevant processing system is equipped with 1-k channels of interference signal tracking modules, and the strong signal receiving channel of each channel of strong interference signal tracking module is composed of a decarrier unit 401, a despreading unit 402, an integral clearing unit 403, a channel processing unit 404, and a code NCO Unit 405, C / A code generator 406, carrier NCO unit 407 and amplitude estimation unit 410 are composed. The intermediate frequency signal 400 from the ADC is connected to the input terminal of the carrier removing unit 401 . The carrier removal unit 401, the despreading u...

no. 3 Embodiment

[0128] In terms of the worst receiving environment, there are 6 GPS satellites with weak signals. It can be inferred that the maximum number of interference estimation channels required is 36. Figure 4 The value of k in the middle is 36, and a 36-channel related processor structure is adopted.

[0129] According to the simulation experiment of the correlation processing system constituted by the method of the invention, a group of effect diagrams of eliminating single satellite interference and eliminating multi-satellite interference are obtained. Figure 5a and Figure 5b The acquisition correlation value-code phase diagram of single satellite interference and the acquisition correlation value-code phase diagram of eliminating single satellite interference are given. Figure 6a and Figure 6b The acquisition correlation value-code phase diagram of multi-satellite interference and the acquisition correlation value-code phase diagram of eliminating all satellite interferenc...

no. 4 Embodiment

[0131]For GPS precision measurement equipment, all interference estimation modules can be turned on regardless of the processing power consumption of the positioning receiver, so as to reduce the error caused by the cross-correlation interference between strong and weak signals to the measurement.

[0132] The present invention can also be used for single-tone (CW) interference cancellation, and the basic principle is the same as that of cross-correlation interference cancellation, which will not be described in detail here.

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Abstract

The invention discloses a method for eliminating an interference signal of a GPS receiver and a related processing system for eliminating the GPS interference signal in real time. A baseband signal processing part of a GPS positioning system is collocated with the related processing system, and a CPU of the baseband signal processing part is collocated with interrelated manipulation program; the related processing system is provided with multiple paths of associative processor channels which are used for parallel processing at least four positioning signals, and the associative processor channels in the related processing system are selectively collocated, so that various disturbing influence on the positioning signal which is caught and tracked can be eliminated, the signal-to-noise is reduced, and the precise catching, tracking and positioning solution for weak satellite signals can be realized, thus improving the positioning coverage rate and precision of the GPS receiver. The method and the system can be used for the related processing system of a code division multiple access (CDMA) global navigational satellite locating receiver and the GPS receiver can provide accurate information of position, speed and time after being processed by the related processing system.

Description

technical field [0001] The invention belongs to satellite positioning communication technology, and relates to a system and method for precise determination of position, speed and time in a GPS receiver. In particular, it relates to a method and system for eliminating interference signals of GPS receivers, which can eliminate cross-correlation interference between strong and weak GPS signals in complex environments, improve positioning sensitivity, and improve positioning coverage and positioning accuracy. Background technique [0002] GPS is a system that uses Direct Sequence Spectrum Spreading (DSSS) and Code Division Multiple Access (CDMA) technologies. The C / A code modulated on the L1 carrier frequency of 1.57542 GHz is a Gold code with a code rate of 1.023 MHz and a length of 1023 chips, and 32 GPS satellites correspond to different pseudo-random codes. The GPS receiver generates local carrier and pseudo-random chips to perform correlation calculations with the receive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S1/04
Inventor 陈学徐建华叶甜春李思超桂琼
Owner 杭州中科微电子有限公司
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