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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  • Abstract
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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 n

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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Experimental program
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Example Embodiment

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

[0097] The correlation of reference waveform signals in the time domain is as Picture 10 Shown.

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

[0099] The forward reference waveform is a bipolar waveform code F(t) with a width of L, which is generated before the actual effect of the locally generated pseudo-random chip, the end point of the forward reference waveform and the locally generated pseudo-random chip The starting points are aligned; when the actua...

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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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