Capture system for improving weak GNSS (global navigation satellite system) signal processing gain

A signal processing, weak technology, applied in the field of navigation and communication, can solve the problems of limited processing gain, limited integration time, etc., to achieve the effect of solving the limited processing gain, increasing the processing gain, and realizing simple effects

Active Publication Date: 2014-05-21
10TH RES INST OF CETC
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Problems solved by technology

[0006] In order to overcome the problem that the code Doppler frequency offset limits the integration time and the processing gain is limited in the weak signal acquisition, the present...

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  • Capture system for improving weak GNSS (global navigation satellite system) signal processing gain
  • Capture system for improving weak GNSS (global navigation satellite system) signal processing gain
  • Capture system for improving weak GNSS (global navigation satellite system) signal processing gain

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Embodiment Construction

[0017] The invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] refer to figure 1 , figure 2 . In the embodiment described below, the acquisition system for improving the processing gain of weak GNSS signals includes: a local pseudocode generator 1, a radio frequency processing unit 2, a tapped delay line module 3, a multiplier 4, a coherent integration module 5, a non-coherent integration module module 6 , parallel correlation unit 7 , extended integration unit 8 , peak judgment module 9 and correlation operation unit 10 . Wherein the correlation operation unit 10 comprises a coherent integration module 5 and a non-coherent integration module 6 connected in series between the output terminal of the multiplier 4 and the extension integration unit 8; the extension integration unit 8 consists of figure 2 The shown data storage module 11 is composed of a series combination adding module 12 and is connected in serie...

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Abstract

The invention provides a capture system for improving weak GNSS (global navigation satellite system) signal processing gain, and aims to provide a processing gain capture system capable of increasing the GNSS processing gain and avoiding related loss of integral operation. The technical scheme includes that an integral extension unit (8) comprising a data storage module (11) and a series combination addition module (12) is arranged between a parallel correlation operation unit (7) and a peak value judgment unit (9), the parallel correlation operation unit (7) is used for performing parallel correlation operation for received signals from a radio frequency processing unit (2) and local spreading codes from a local pseudo-code generator (1), transmitting operation processing results into the integral extension unit (8) for extending integrals, transmitting integral extension results into the peak value judgment unit (9) and comparing the integral extension results with a related peak value judgment threshold set by a threshold circuit, and the peak value judgment unit judges whether capture is finished or not by threshold comparison to capture signals.

Description

technical field [0001] The invention relates to the field of navigation and communication, and relates to a weak global navigation satellite system (GNSS) signal acquisition system. technical background [0002] Weak GNSS signal acquisition technology is one of the core technologies to realize weak signal GNSS navigation, and it is also one of the research difficulties in the field of Global Navigation Satellite System (GNSS). For satellite navigation signals, the strength of satellite navigation signals is about -130dBm under open conditions near the surface, and its carrier-to-noise ratio is about 45dB-Hz, and the signal strength will attenuate when there are buildings or vegetation covering it. Generally, signals with a carrier-to-noise ratio greater than 45dB-Hz are regarded as strong signals, and signals with a carrier-to-noise ratio greater than 28dB-Hz are regarded as weak signals. For GNSS civil satellite signals, the signal power declines greatly so that the receiv...

Claims

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Application Information

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IPC IPC(8): G01S19/30
CPCG01S19/246G01S19/254G01S19/30
Inventor 刘田周文涛黄凌陈晓萍
Owner 10TH RES INST OF CETC
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