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Multipath inhibiting method of correlator

A correlator and expression technology, applied in the field of GPS communication, can solve the problems of insignificant short multipath suppression effect and large error, and achieve the effects of accurate code phase estimation, performance improvement and precise positioning

Inactive Publication Date: 2011-04-20
SOUTHEAST UNIV
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Problems solved by technology

[0005] The Strobe correlator has a good suppression effect on long multipath, but when the code phase offset is small, the error is still large, that is, the existing Strobe has no obvious suppression effect on short multipath

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Embodiment Construction

[0024] see figure 1 , the satellite 101 sends out a signal, part of which is a direct signal 102, which directly reaches the receiving antenna 103; while the other part reaches the antenna after being reflected by the ground plane or other buildings 105, which is the multipath signal 104, and the multipath signal interferes with the positioning accuracy .

[0025] see figure 2 , according to the relationship between the phase of the multipath signal and the direct signal, the multipath signal can be divided into two types: in-phase signal and anti-phase signal.

[0026] see image 3 , the correlation triangle output by the correlator is shown in the figure, and different correlation intervals can obtain different leading components and lagging components. In the figure, d1=d, d2=2d, d is the interval of a C / A code chip, ideally , respectively to get E 2 ,E 1 , P, L 1 , L 2 The position on the relevant triangle is shown in the figure; if there are multipaths, their posi...

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Abstract

The invention discloses a multipath inhibiting method of a correlator. On the basis of a Strobe correlator, a corrolator is formed by two groups of early-late codes E2, E1, P, L1 and L2; code loop parts are accumulated and pass through a memory so as to obtain an output result; and the output result is substituted into a Strobe correlation formula so as to obtain a correlation result. The method is characterised in that IE2, IE1, IP, IL1 and IL2 are inputted in a mode discriminator, when the sum of IE2 and IE1 minus the sum of IL1 and IL2 is less than zero, the multipath is the in-phase multipath, and then a modification factor item is added into the correlation formula so as to overcome the shortcoming that the conventional Strobe correlator cannot inhibit the short multipath; meanwhile, the positioning accuracy is improved, particularly, the method has great significance to the condition that the serious multipath interference exists in the global positioning system (GPS) positioning in urban environment.

Description

technical field [0001] The invention relates to a correlator (correlator) in a GPS system, in particular to a correlator method for suppressing multipath, and belongs to the technical field of GPS communication. Background technique [0002] The signal transmitted by the GPS satellite is the signal obtained by modulating the pseudo code (C / A code) and the navigation data code on the carrier. Modern general-purpose digital GPS receivers are mainly composed of GPS antennas, frequency converters, baseband signal channels, and data output, etc., to complete functions such as signal reception, capture, tracking, demodulation, and positioning calculations. The basic workflow is: GPS antenna receives all visible GPS satellite signals, converts weak electromagnetic waves into weak currents, and then amplifies the GPS signal current through the pre-low noise amplifier, and then down-converts high-frequency signals to intermediate frequencies through frequency conversion The digital ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/22G01S19/21
Inventor 杨军庄园丁荣荣李超刘新宁时龙兴
Owner SOUTHEAST UNIV
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