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System for measuring P(Y) code phase difference of multi-path GPS (global position system) signals

A GPS signal and measurement system technology, used in measurement devices, height/level measurement, surveying and navigation, etc., can solve the problem of low accuracy of multi-channel GPS signal phase difference measurement, reduce hardware complexity, and achieve high measurement accuracy. Effect

Inactive Publication Date: 2013-04-03
BEIHANG UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Through the above experiments, it can be seen that the use of C / A codes to measure the phase difference of multiple GPS signals does not have high precision

Method used

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  • System for measuring P(Y) code phase difference of multi-path GPS (global position system) signals
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  • System for measuring P(Y) code phase difference of multi-path GPS (global position system) signals

Examples

Experimental program
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Effect test

Embodiment Construction

[0023] There are two ranging codes, C / A code and P(Y) code, on the GPS signal. The C / A code is only modulated on the L1 carrier signal, with a period of 1ms and a code rate of 1.023Mcps; while the P(Y) code is simultaneously It is modulated on the L1 and L2 carrier signals, the period is 7 days, and the code rate is 10.23Mcps.

[0024] see figure 1 Shown, the present invention is a kind of direct signal that utilizes navigation satellite to replace local signal and reflected signal to carry out cross-correlation operation, utilizes different cross-correlation power values ​​to carry out the P (Y) code phase difference estimation of multi-path GPS signal, and then realizes sea surface Measuring systems for height measurement, sea surface wind field inversion, aircraft attitude measurement, deformation monitoring, etc., the measurement system for the P code phase difference of the multi-channel GPS signal includes a direct signal acquisition and tracking module 10, an array mult...

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Abstract

The invention discloses a system for measuring P(Y) code phase difference of multi-path GPS (global position system) signals. The system comprises a direct signal acquisition and tracking module, an array multiplier module and a height measuring module. According to a quadrature modulation characteristic of a GPS, orthogonal signals and in-phase signals of received satellite signal are extracted, C / A codes and P(Y) codes are separated from the signals, the equidistant same delay is respectively performed on the signals, the cross-correlation calculation is performed on the delayed signals and reflected signals, different delay code pieces can generate different non-coherent integration values, and thus the P(Y) code phase difference of the multi-path GPS signals is obtained. The measuring system reduces the complexity of hardware receiving equipment, and meanwhile, the measuring accuracy is improved.

Description

technical field [0001] The present invention relates to a phase code measurement, more specifically, refers to a method that uses the direct signal of the navigation satellite to replace the local signal and the reflected signal to perform cross-correlation calculation, and uses the cross-correlation result to perform multi-path GPS signal P (Y) code Estimation of the phase difference, and then apply the estimated results to applications such as sea surface height measurement, sea surface wind field inversion, aircraft attitude measurement, deformation monitoring, etc. Background technique [0002] In recent years, microwave remote sensing technology based on GNSS reflected signals has shown broad application prospects in the field of remote sensing due to its application advantages such as all-weather, all-time, multiple signal sources, wide coverage, and high temporal and spatial resolution. The rapid development of GPS measurement technology has brought a new look to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C5/00
Inventor 李伟强杨东凯秦瑾张波张帅
Owner BEIHANG UNIV