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Satellite navigation pilot signal acquisition method, pseudo random sequence stripping method and device

A pseudo-random sequence and pilot signal technology, applied in the field of navigation, can solve problems such as limiting the cumulative length of coherent coherence, and achieve the effect of high detection probability and high output signal-to-noise ratio.

Active Publication Date: 2013-07-10
UNICORE COMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0043] During the acquisition phase, the presence of the second respreading code limits the length of the coherent accumulation

Method used

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  • Satellite navigation pilot signal acquisition method, pseudo random sequence stripping method and device
  • Satellite navigation pilot signal acquisition method, pseudo random sequence stripping method and device
  • Satellite navigation pilot signal acquisition method, pseudo random sequence stripping method and device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Embodiment 1. A satellite navigation pilot signal acquisition method, such as image 3 shown, including:

[0097] Carrying out coherent integration to the received satellite navigation pilot signal to obtain a coherent integral value; the length of the integral interval of the coherent integral is the period of the first pseudo-random sequence, which is the symbol width of the second sequence;

[0098] In the obtained coherent integral value, the coherent integral value corresponding to the same symbol in the second pseudo-random sequence is accumulated to obtain the in-phase accumulation result and the quadrature of each symbol in the second pseudo-random sequence period accumulated results;

[0099] For each symbol in the second pseudo-random sequence period, carry out the following processing respectively: use the square of the in-phase accumulation result of the symbol and the square addition of the orthogonal accumulation result to obtain the addition result of th...

Embodiment 2

[0150] Embodiment two, a method for stripping the second pseudo-random sequence in a satellite navigation pilot signal, comprising:

[0151] In the coherent integral value obtained by coherent integration of the satellite navigation pilot signal with an integration interval length of the period of the first pseudo-random sequence, it will correspond to the coherent integral value of the same symbol in the second pseudo-random sequence Accumulate to obtain an in-phase accumulation result and an orthogonal accumulation result of each symbol in a second pseudo-random sequence period;

[0152] For each symbol in the second pseudo-random sequence period, carry out the following processing respectively: use the square of the in-phase accumulation result of the symbol and the square addition of the orthogonal accumulation result to obtain the addition result of the symbol;

[0153] After all symbols are processed, the addition result of each symbol in the second pseudo-random sequenc...

Embodiment 3

[0158] Embodiment three, a kind of acquisition device of satellite navigation pilot signal, comprises:

[0159] A matched filter is used to carry out coherent integration whose integral interval length is the period of the first pseudo-random sequence to the received satellite navigation pilot signal to obtain a coherent integral value;

[0160] The class coherent accumulation module is used for accumulating the coherent integral value corresponding to the same symbol in the second pseudo-random sequence in the obtained coherent integral value to obtain each code in the second pseudo-random sequence period In-phase accumulation results and quadrature accumulation results of elements;

[0161] The non-coherent accumulation module is used to perform the following processing on each symbol in the second pseudo-random sequence cycle: add the square of the in-phase accumulation result of the symbol and the square of the quadrature accumulation result to obtain the code The additio...

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Abstract

The invention discloses a satellite navigation pilot signal acquisition method, a pseudo random sequence stripping method and a device. The satellite navigation pilot signal acquisition method includes realizing coherent integration for received satellite navigation pilot signals with integration interval length equal to the period of a first pseudo random sequence, and obtaining coherent integral values; adding coherent integral values corresponding to the same code elements in the period of a second pseudo random sequence, and obtaining same-phase accumulated results and orthogonal accumulated results of various code elements in the period of the second pseudo random sequence; processing each code element in the period of the second pseudo random sequence in the following way of adding square of the same-phase accumulated results of the code element to square of the orthogonal accumulated results of the code element to obtain an addition result of the code element; accumulating the addition results or square root of the addition results of the various code elements in the period of the second pseudo random sequence after all the code elements are processed, and obtaining an accumulated value; and realizing peak search for the accumulated value, comparing the accumulated value with a set threshold, and completing acquisition of the signals.

Description

technical field [0001] The invention relates to the field of navigation, in particular to a satellite navigation pilot signal acquisition method, a pseudo-random sequence stripping method and a device. Background technique [0002] With the integration of GNSS (Global Navigation Satellite System, Global Navigation Satellite System) technology and mobile communication technology, GNSS has gradually entered the stage of indoor application. Due to the increased signal attenuation in the indoor environment, the signal strength reaching the receiver antenna is greatly reduced, and radio frequency interference such as multipath and cross-correlation is also more serious than in the outdoor environment. The rapid development of indoor applications puts forward higher requirements on receiver sensitivity (acquisition sensitivity and tracking sensitivity). Both acquisition and tracking sensitivity are limited by the length of coherent accumulation. The GPS-LlC / A signal receiver uses...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/24G01S19/30G01S19/35
Inventor 邱剑宁莫钧韩绍伟
Owner UNICORE COMM INC
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