Anti-multipath reception method applied to bpsk signal

A receiving method and anti-multipath technology, applied in the field of satellite navigation, can solve problems such as the gap of the optimal pseudocode phase discrimination function, and achieve the effect of excellent anti-multipath performance

Active Publication Date: 2018-12-07
湖南中电星河电子有限公司
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Problems solved by technology

Traditional reference waveforms include W2 waveform, W3 waveform, W4 waveform, etc., which can effectively suppress multipath signals with medium and long-distance delays, but in terms of multipath suppression, there is still a large gap with the optimal pseudo-code phase detection function

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  • Anti-multipath reception method applied to bpsk signal
  • Anti-multipath reception method applied to bpsk signal
  • Anti-multipath reception method applied to bpsk signal

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Embodiment Construction

[0028] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but this does not constitute a limitation of the present invention.

[0029] Such as Figure 1 to Figure 6 As shown, the unambiguous reference waveform receiving method applied to the BPSK signal of the present embodiment includes the following steps:

[0030] Step S1: Phase rotate and split the received satellite navigation signal to obtain two orthogonal signals respectively z i ( t )and z q ( t );

[0031] Step S2: The local pseudocode generator generates a local replica signal according to the pseudocode phase information obtained by the pseudocode phase detector X ( t ), X ( t ) respectively with z i ( t )and z q ( t ) correlation, accumulation, get I P and Q P , the calculation formula is

[0032]

[0033]

[0034] The value of T is generally selected as 1ms;

[0035] The local reference waveform generation modu...

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Abstract

The invention discloses an anti-multipath receiving method for BPSK signals, comprising the following steps: a received satellite navigation signal is phase-rotated and split to obtain zi(t) and zq(t); a local replication signal X(t) is generated according to pseudo-code phase information, and X(t) is correlated with and added up to zi(t) and zq(t) respectively to obtain Ip and Qp; a reference waveform signal W(t) is generated according to the pseudo-code phase information, wherein the basic waveform signal of W(t) is composed of three basic rectangular waves, the amplitudes of the first two basic rectangular waves are 1 and the widths are delta1, the width of the third basic rectangular wave is delta2, and the amplitude of the third basic rectangular wave is -delta1 / delta2; W(t) is correlated with and added up to zi(t) and zq(t) respectively to obtain Iw and Qw; S3, a pseudo-code phase discrimination function is obtained through a formula d(epsilon)=Ip(epsilon)*Iw(epsilon)+Qp(epsilon)*Qw(epsilon) according to Ip, Qp, Iw and Qw obtained in S2; and S4, the steps S2 to S3 are repeated to realize BPSK signal pseudo code tracking. By adopting the method of the invention, better anti-multipath performance than W2 waveform can be obtained.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to an unambiguous and anti-multipath receiving method applied to BPSK signals. Background technique [0002] Multipath is caused by the satellite direct signal entering the receiver antenna through the reflection of surrounding objects. Since it is difficult to eliminate by establishing mathematical models and differences, multipath has become one of the main error sources for satellite navigation system positioning at present. The resulting error can be The meter level directly affects the positioning accuracy of the satellite navigation system. At present, satellite navigation receivers generally use code correlation reference waveform technology to eliminate multipath errors. The code-related reference waveform technology constructs a relatively ideal pseudo-code phase discrimination function by generating a series of reference waveforms locally. Traditional refere...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/22G01S19/30
CPCG01S19/22G01S19/30
Inventor 李柏渝刘哲牟卫华黄龙张勇虎李彩华倪少杰唐小妹李峥嵘
Owner 湖南中电星河电子有限公司
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