General-purpose satellite navigation signal interference source and method for generating signal thereof
A satellite navigation signal and interference source technology, which is applied in the field of satellite navigation and can solve problems such as the inability to simulate the interference environment of GNSS receivers
Inactive Publication Date: 2011-09-07
BEIHANG UNIV
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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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[0029] In the embodiment of the present invention, the state parameters of various interference signals received by the actual receiver are simulated and calculated according to the environmental conditions or the control parameters of the interference signals input by the user are directly digital frequency synthesized to generate I and Q two-channel low-IF digital interference signal.
[0030] Perform digital quadrature up-conversion and D / A conversion on the above-mentioned low-IF digital signal to obtain I and Q two-channel IF analog signals. And the frequency point and power attenuation of the radio frequency local oscillator are set according to the control parameters of the interference signal.
[0031] According to the frequency of the radio frequency local oscillator, the local oscillator frequency of various frequency points is generated by the principle of phase-locked frequency synthesis, and the radio frequency local oscillator signal with the local oscillator frequenc...
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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 universal satellite navigation signal interference source with wide interference frequency band, multiple interference modes, and flexible controllable parameters such as frequency point, bandwidth, power and the like of the interference signal, and a signal generation method thereof. Background technique [0002] At present, GNSS (Global Navigation Satellite System, Global Navigation Satellite System) technology has been widely used in military and civilian fields. Since GNSS receivers rely on external radio frequency signals, they are easily affected by radio frequency interference, which can lead to reduced navigation accuracy or complete GNSS receiver lock-out. The problem of GNSS interference and anti-interference has gradually become an urgent problem to be solved. [0003] Various types of radio frequency interference can be divided into broadband radio frequenc...
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IPC IPC(8): G01S1/04
Inventor 寇艳红马忠志张波张其善张景山
Owner BEIHANG UNIV