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Global navigation satellite system signal processing method and correlator

A technology for global navigation satellites and system signals, applied in the field of conflict handling methods and correlators implementing the method, can solve problems such as high cost and wrong decisions, and achieve the effect of reducing the possibility

Inactive Publication Date: 2011-12-21
MEDIATEK INC
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the cost is also high
in addition, this method is not suitable when the estimate of strong signal interference is incorrect or unknown, so it may also lead to wrong decisions when searching for other satellite signals

Method used

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  • Global navigation satellite system signal processing method and correlator
  • Global navigation satellite system signal processing method and correlator
  • Global navigation satellite system signal processing method and correlator

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Embodiment Construction

[0018] When the signal encounters interference from another satellite (another PRN code), in addition to the actual signal peak, there are many sub-peaks caused by cross-interference appearing in multiple chips at a specific Doppler frequency, so that Taking global positioning system (global positioning system, hereinafter referred to as GPS) satellite signals as an example, these specific Doppler frequencies are 1 kHz apart from each other. This is what is commonly referred to as "PRN interference". Sub-peaks caused by strong PRN interference can be higher than the noise floor and lead to wrong decisions or jeopardize tracking reliability during signal hunting. C / A (Course AcquisitionCode) code cross-correlation energy is 24dB weaker than the auto-correlation main peak. When the signal energy of the target satellite is very weak, and there are strong satellite signals in the environment, in this case, the presence of other strong satellite signals will cause serious PRN inte...

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PUM

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Abstract

A method of processing a global navigation satellite system signal, comprising receiving a global navigation satellite system signal; calculating a plurality of correlation results for a plurality of chip assumptions of a specific Doppler frequency; and analyzing the correlation results to determine whether the specific Doppler frequency is polluted by interference. Through the present invention, it is easy to check whether the Doppler frequency range is disturbed. In addition, if it is determined that the Doppler frequency range is disturbed, the probability of wrong determination of signal peaks can be reduced by raising the signal search threshold to a higher value.

Description

【Technical field】 [0001] The present invention relates to the Global Navigation Satellite System (Global Navigation Satellite System, hereinafter referred to as GNSS), in particular, for detecting interference (interference) (including interference outside the satellite system and cross-correlation interference from other satellite signals), and avoiding A conflict handling method for wrong decisions in signal peak searching and a correlator implementing the method. 【Background technique】 [0002] In a satellite communication system, such as GNSS, a receiver detects signals from each satellite, and the signals from each satellite can be distinguished by a unique pseudorandom noise code (Pseudo random noise Code, hereinafter referred to as PRN code). The receiver also measures the time delay of each satellite. The receiver generates a corresponding PRN sequence (ie local PRN replication) for each satellite. By correlating the received satellite PRN sequence with the local P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S1/02G01S1/04G01S5/02G01S19/29G01S19/25G01S19/30
CPCG01S19/254G01S19/21G01S19/29G01S19/30
Inventor 李冠仪游宗桦陈安邦
Owner MEDIATEK INC
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