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Alternate binary offset carrier (AltBOC) signal acquisition device

A technology of offset carrier and signal capture, which is applied in the direction of phase-modulated carrier system, baseband system components, multi-frequency code system, etc. It can solve the problems of introducing square loss, affecting capture performance, and wrong capture, so as to reduce square loss, Effects that improve capture performance

Inactive Publication Date: 2010-12-01
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the FIC and direct capture algorithms will cause false capture, the actual AltBOC signal capture generally uses a sideband processing algorithm (SSB or DSB)
The traditional sideband processing algorithm realizes the joint processing of data and pilot channel signals through non-coherent accumulation, which introduces square loss and affects the capture performance

Method used

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  • Alternate binary offset carrier (AltBOC) signal acquisition device
  • Alternate binary offset carrier (AltBOC) signal acquisition device
  • Alternate binary offset carrier (AltBOC) signal acquisition device

Examples

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Embodiment

[0133] In the foregoing detailed description, embodiments of the present invention have been described using the generalized AltBOC(m,n) signal. The present invention will be further described below by taking the AltBOC (15, 10) adopted by the Galileo system as an example.

[0134] The upper and lower sideband signals of the AltBOC (15, 10) signal of the Galileo system are E5a and E6a respectively, and each signal contains data and pilot channels, and the data and pilot channels correspond to the general AltBOC (m, n) signal The in-phase and quadrature components of . Wherein, the data channel is modulated with navigation message (data bit information), and the pilot channel is not modulated with navigation message (data bit information). Therefore, for this example there are

[0135] e L-I (t)=e E5a-I (t)=c E5a-I (t)d E5a-I (t) (14)

[0136] e L-Q (t)=e E5a-Q (t)=c E5a-Q (t) (15)

[0137] e U-I (t)=e E5b-I (t)=c E5b-I (t)d E5b-I (t) (16)

[0138] e U-Q (t)=e ...

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Abstract

The invention discloses an alternate binary offset carrier (AltBOC) signal acquisition device. The device comprises a sideband processing module, a correlator module, a decision variable generating module and a threshold decision module, wherein the sideband processing module comprises a sub-carrier signal generator, a low pass filter and a multiplier; the correlator module comprises a spectrum-spreading code generator and an integrator; and the decision variable generating module comprises two component synthesizers, four comparators, an incoherent accumulator and three adders. In the device, the AltBOC signal is divided into two-path like quadrature phase-shift keying (QPSK) signals by frequency shift to eliminate the wrong acquisition caused by the sub-carrier signal of the AltBOC signal; and the upper and lower sideband signals of the AltBOC signal adopt an incoherent accumulation manner so as to reduce the complexity of realization.

Description

technical field [0001] The invention belongs to the technical field of GNSS signal processing, and in particular relates to an alternate binary offset carrier signal acquisition device. Background technique [0002] The satellite navigation signals of the new generation of GPS system and Galileo system will generally adopt binary offset carrier (BOC) modulation technology. Compared with the traditional BPSK modulation method, the BOC modulation method has the advantages of improving the utilization of the navigation frequency band, suppressing signal multipath errors, reducing signal coherence loss, improving pseudo-range measurement accuracy, and enhancing signal anti-jamming performance. The Alternate Binary Offset Carrier (AltBOC) signal is an extension of the BOC signal and has a similar spectral structure to the BOC signal. The AltBOC signal performs spectrum shifting through complex subcarrier signals, realizing the transmission of one navigation signal in the upper a...

Claims

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Application Information

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IPC IPC(8): H04L27/22H04L27/26H04L25/02
Inventor 杨再秀耿生群黄智刚农晓东郭振扬陈夏兰王海峰李岑
Owner BEIHANG UNIV