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Filter method for restraining multipath interference and noise

A multi-path interference and filter technology, which is applied in the field of GPS communication to achieve the effects of improving solution positioning accuracy, positioning accuracy and pseudo-range accuracy.

Inactive Publication Date: 2013-07-31
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0005] Aiming at the defects of fixed filter window length N in the existing carrier Doppler auxiliary code pseudo-range method, the present invention proposes a filter method for suppressing multipath interference and noise

Method used

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  • Filter method for restraining multipath interference and noise
  • Filter method for restraining multipath interference and noise

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Embodiment Construction

[0026] see figure 1 , which is a block diagram of the high-level system structure of the receiver. It includes: RF antenna, low noise amplifier, RF module, reference oscillator clock source, baseband signal processing engine, positioning solution, man-machine interface, power supply, etc. After the GPS signal is received by the antenna, it first passes through the low-noise amplifier to amplify the signal while reducing noise interference, and then passes through the RF module. The RF module down-converts the carrier frequency of the signal from the L1 frequency band (1.575GHz) to near the intermediate frequency, and uses a band-pass filter to reduce out-of-band noise interference. According to the frequency scheme in the receiver design scheme, the local oscillator is derived from the reference oscillator through the frequency synthesizer. After the frequency mixing process, the carrier Doppler and spreading code are retained, and through the subsequent baseband signal proc...

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Abstract

The invention discloses a filter method for restraining multipath interference and noise, which assists a code pseudo range by carrier Doppler to restrain multipath and environmental noises. With respect to the fixed filtering windows in the prior art, the filter method provides dynamic regulating filtering windows; the filtering state is entered from a first data; the lengths of the windows are added one by one until the pre-set filtering window lengths are reached. Without any doubt, the method is more flexible and can enter the filtering state rapidly without waiting for the time of a filtering window length. The system is instable at the initial phase of positioning; the positioning point skips greatly; the method can enhance positioning precision at the initial phase and is especially significant to the precise positioning in the situation of serious multipath interference in globe positioning system (GPS) positioning and a city environment with other environmental noises.

Description

technical field [0001] The invention relates to a filter method in a GPS system, in particular to a filter method for suppressing multipath interference and noise, and belongs to the technical field of GPS communication. Background technique [0002] The radio frequency signal transmitted by the GPS satellite is the signal obtained by modulating the C / A code and navigation data on the carrier. Modern general-purpose digital GPS receivers include radio frequency receiving antennas, down-converters, baseband signal channels, and data output to complete signal reception, capture, bit synchronization, tracking, demodulation, and positioning calculations. Its basic workflow is: GPS antenna receives all visible GPS satellite signals, converts weak electromagnetic waves into weak currents, then amplifies the weak signal currents through pre-low noise amplifiers, and then down-converts high-frequency signals through frequency conversion The intermediate frequency digital signal is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/22G01S19/21
Inventor 杨军丁荣荣孙丽赵岩时龙兴
Owner SOUTHEAST UNIV
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