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Satellite navigation anti-interference receiving system

A satellite navigation and receiving system technology, applied in the field of satellite navigation anti-jamming receiving systems, can solve the problems of large radian of conformal surface, deterioration of system signal-to-noise ratio, poor consistency of received signal amplitude, etc., achieving compact structure and solving channel amplitude consistency. The effect of poor performance and avoiding the decline of anti-interference performance

Active Publication Date: 2017-01-04
BEIJING AEROSPACE INST OF THE LONG MARCH VEHICLE +1
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Problems solved by technology

However, in some conformal array applications, due to the limited size, the conformal surface has a large radian, the antenna array is a non-planar array, and the amplitude consistency of the received signal is poor. Therefore, a satellite that adapts to the non-planar array is needed. The anti-interference processing method of navigation signal and its adaptation
[0003] In traditional applications, anti-jamming processing and satellite navigation reception belong to different stand-alone machines. The satellite signal enters the anti-jamming processor from the antenna array. Conversion and up-conversion into the satellite navigation receiver, this design ensures the stability of the satellite navigation receiving system to a certain extent, but due to the noise generated by up-down conversion and analog-to-digital conversion, the signal-to-noise ratio of the entire system deteriorates

Method used

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Embodiment

[0060] The four RF signals received by the antenna array pass through the RF channel to form four analog IF signals, and enter the baseband processing module. First, the high-speed and high-precision AD sampling chip performs sampling, converts the analog signals into digital IF signals, and transmits them to the FPGA. . The FPGA is responsible for performing broadband conventional beamforming on the first array element and the second array element, the first array element and the third array element, the fourth array element and the second array element, and the fourth array element and the third array element, respectively. The intermediate frequency digital signal of four sub-beams is expanded to 4P space-time signal, the autocorrelation matrix of the signal is calculated and transmitted to the DSP, and the DSP is responsible for the weight calculation of the space-time two-dimensional signal processing of power inversion, and the weight It is sent back to the FPGA, and the...

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Abstract

The invention discloses a satellite navigation anti-interference receiving system, and the system consists of an antenna array, an anti-interference receiver, and a high-frequency cable network. The antenna array consists of a passive antenna with the stable phase center. The anti-interference receiver consists of a radio frequency module, an anti-interference receiving module, and a power module. The radio frequency module carries out the signal amplification, filtering and down-conversion, and transmits an intermediate frequency signal to the anti-interference receiving module. The anti-interference receiving module consists of a baseband processing module and a satellite navigation receiving module. The baseband processing module carries out the signal sampling, preprocessing and adaptive space-time filtering processing, and aims at adjusting the directional diagram of the antenna array in real time according to the direction change of an interference signal, and inhibiting the interference signal, so as to improve the interference signal power ratio of a received signal. The anti-interference receiving module directly outputs a single digital intermediate frequency signal to the satellite navigation receiving module, and the satellite navigation receiving module is used for the capturing, tracking and positioning resolving of a satellite navigation signal, and outputting a positioning result to a control system for processing.

Description

technical field [0001] The invention relates to a satellite navigation anti-interference receiving system, which belongs to the technical field of array signal processing. Background technique [0002] The anti-interference of the satellite navigation system depends on the receiving antenna array. The traditional antenna array is a planar array, which can ensure the amplitude consistency of the received signal and achieve a good anti-interference processing effect. However, in some conformal array applications, due to the limited size, the conformal surface has a large curvature, the antenna array is a non-planar array, and the amplitude consistency of the received signal is poor. Therefore, a satellite that adapts to the non-planar array is required. The navigation signal anti-interference processing method adapts to it. [0003] In traditional applications, anti-jamming processing and satellite navigation reception belong to different stand-alone machines. The satellite s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 李莎莎方岳王晓飞吴学森陈莽张宇翔李强金文王遂学赵凤红彭云苏晓东王煊
Owner BEIJING AEROSPACE INST OF THE LONG MARCH VEHICLE
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