General-purpose satellite navigation signal interference source and method for generating signal thereof

Abstract

The invention provides a general satellite navigation signal interference source and a signal generating method thereof. The general satellite navigation signal interference source is mainly composed of a main control software module, an intermediate frequency interference signal generating module and a radio up-conversion circuit. The method mainly comprises the steps of: according to the control parameters of the interference signal input by users as interference mode, frequency points, bandwidth and power and the like, processing digital frequency synthesis to generate low-intermediate frequency digital signals, processing digital orthogonal up-conversion and D/A conversion for the low-intermediate digital signals, to attain intermediate frequency analogue signal output. The invention utilizes phase lock frequency synthesis theory to generate the local oscillation frequency of corresponding frequency points, mixes the radio frequency local oscillation signal of the local oscillation frequency and the intermediate frequency analogue signals via an orthogonal modulation, processes automatic gain control and accurate power control to output the attained radio frequency interference signals. The invention can simulate the interference condition of a receiver actually receiving satellite signals.

Description

technical field [0001] The invention belongs to the field of satellite navigation, and in particular relates to a general-purpose satellite navigation signal interference source and a signal generation method thereof with wide interference frequency band and multiple interference modes, and flexible and controllable parameters such as the frequency point, bandwidth, and power of the interference signal. Background technique [0002] At present, GNSS (Global Navigation Satellite System, Global Navigation Satellite System) technology has been widely used in military and civilian fields. Because GNSS receivers rely on external radio frequency signals, they are susceptible to radio frequency interference, which can lead to reduced navigation accuracy or complete loss of lock to the GNSS receiver. The problem of GNSS interference and anti-interference has gradually become an urgent problem to be solved. [0003] Various radio frequency interferences can be divided into wideband ...

AI Technical Summary

Problems solved by technology

[0007] At present, there is no domestic general-purpose satellite navigation signal interference source product with flexible and controllable interference modes, frequency range covering the entire GNSS frequency band, power dynamic range reaching 60dB, and bandwidth reaching 40MHz

However, the existing general-purpose signal source instruments cannot simulate the interference environment of the GNSS receiver during the actual satellite signal reception process.

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