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Novel multi-path inhibition BOC (Binary Offset Carrier) code tracking method and code tracking ring

A technology of multipath suppression and code tracking loop, which is applied in the field of communication, can solve the problems of multiple zero-crossing points of the phase detection curve, difficult precise positioning, poor linearity of the phase detection curve, etc., and achieves overcoming offset, accurate ranging, good linear effect

Inactive Publication Date: 2012-02-01
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phase detection curve constructed by the current code tracking loop will have zero-crossing points deviate from the origin, the linearity of the phase detection curve is not good, and there are multiple zero-crossing points in the phase detection curve, which makes tracking errors unavoidable during reception and difficult to accurately locate.

Method used

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  • Novel multi-path inhibition BOC (Binary Offset Carrier) code tracking method and code tracking ring
  • Novel multi-path inhibition BOC (Binary Offset Carrier) code tracking method and code tracking ring
  • Novel multi-path inhibition BOC (Binary Offset Carrier) code tracking method and code tracking ring

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Embodiment Construction

[0096] In this embodiment, BOC(2n,n) is taken as an example, and the ratio of the frequency of the locally generated BOC code to the frequency of the pseudo-random code is 2.

[0097] The relationship between the reference waveform signals in the time domain is as follows: Figure 10 shown.

[0098] in the picture refers to a locally generated pseudo-random sequence, is a locally generated BOC(2,1) code, They are the forward reference waveform, the backward reference waveform and the instant reference waveform generated locally, and these five signals are generated synchronously in the receiver, where It is the positive / secondary delay (delay or advance) of the code phase detection output.

[0099] The forward reference waveform is a bipolar waveform code F(t) with a width of L, which is generated before the actual acting locally generated pseudo-random chip, and the end point of the forward reference waveform is the distance between the locally generated pseudo-random...

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Abstract

The invention provides a pseudo-random code phase tracking method and a code tracking ring multi-path inhibition BOC (Binary Offset Carrier) code tracking method, which effectively inhibit multi-path effect according to structural characteristics of a BOC signal. A pseudo-random code generating step, a BOC code generating step, a reference waveform generating step, a relevant waveform constructing step, a mutual correlation step, a phase discrimination function generating step and a phase discrimination step are included. According to the invention, in the correlation waveform constructing step, the constructed forward correlation function and backward correlation function only have one peak value and good linearity is obtained; and a zero crossing point of a phase discrimination curve and a zero crossing point while no multi-path signal is available have no deviation when multi-path effect exists so that the offset of the tracking point is overcome to achieve the accurate distance measuring and positioning purpose.

Description

technical field [0001] The present invention relates to communication technology, in particular to subcarrier BOC (Binary Offset Carrier, Binary Offset Carrier) modulation technology. Background technique [0002] 1. BOC subcarrier modulation: [0003] The frequency band allocated by the International Telecommunication Union (ITU) to the satellite navigation system (GNSS) is limited, and more and more navigation signals occupy the already crowded satellite navigation frequency band resources. At the same time, the increase in signal power makes inter-system and system Internal disturbances are getting worse. These interferences will lead to system performance degradation or unavailability, so GNSS system compatibility has increasingly become an important issue that plagues the development of navigation systems. In order to improve the compatibility of various navigation systems, improvements in the signal structure are required, which leads the modernization process of GNS...

Claims

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Application Information

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IPC IPC(8): G01S19/30G01S19/22
Inventor 何春徐辉宗竹林
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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