System for estimating influence of interference signal on GPS performance

Abstract

The invention discloses a system for estimating influence of interference signal on GPS performance based on a GPS software receiver. The system comprises a GPS antenna module and radio frequency module subsystem, an interference signal simulation subsystem, a GPS software receiver subsystem, and a GPS software receiver estimation subsystem, wherein the GPS antenna module and radio frequency module subsystem is used for converting the received GPS signal from the radio frequency to the intermediate frequency by down-frequency conversion, and outputting the digital intermediate frequency signal obtained by sampling to the GPS software receiver subsystem; the interference signal simulation subsystem is used for generating the digital interference signal, and outputting the generated digital interference signal to the GPS software receiver subsystem; the GPS software receiver subsystem is used for performing signal acquisition, signal tracking, bit synchronization and frame synchronization, pseudo range computation and computation of a satellite position and a user position on the inputted digital intermediate frequency signal and digital interference signal, and outputting the results to the GPS software receiver estimation subsystem; and the GPS software receiver estimation subsystem is used for performing error analysis on the received results to realize estimation of the influence of the interference signal on GPS performance. The system can determine which aspects in the interference signal are main factors of influencing the GPS performance.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a system for evaluating the influence of jamming (jamming or interference) signals on GPS performance based on GPS software receivers. Background technique [0002] GPS uses direct sequence spread spectrum technology to have a certain anti-interference ability, but the GPS signal reaching the ground is very weak, and the power of the GPS signal to the ground receiving place is about -160dBW, because the receiver signal despreading process, the processing gain is related to the pseudo code It is obtained after the occurrence, so that the receiver is easily affected by various intentional and unintentional radio frequency interference. The effect of radio frequency interference on code correlation will reduce the carrier-to-noise density ratio (C / N0) of all GPS signals. If C / N0 drops below the tracking threshold of the GPS receiver, the GPS receiver loses lock and los...

AI Technical Summary

Problems solved by technology

At present, there are many methods for suppressing GPS interference signals, but many methods are carried out on various GPS hardware receivers. It is difficult to change various parameters of the receiver to meet the needs of signal processing while adding hardware support. More importantly, Due to differences in hardware and receiver architecture, it is difficult to determine which aspect of the interfering signal is the main factor affecting GPS performance

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