Method for obtaining anti-interference signal of satellite navigation receiver

A satellite navigation and interference signal technology, applied in the field of satellite navigation, can solve the problems of prolonged acquisition time of satellite navigation receivers, time-varying statistical characteristics of mode types, poor interference signal suppression effect, etc., so as to suppress narrowband and wideband interference and simplify calculation. , the effect of improving quality

Pending Publication Date: 2020-11-24
ANHUI SUN CREATE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual communication, the electromagnetic environment is complex, and there are various types of man-made interference with time-varying statistical characteristics, especially high-power narrowband and broadband interference, which has become one of the most important factors that destroy the communication system.
Interference will prolong the acquisition time of the satellite navigation receiver and increase the probability of false alarms. In severe cases, the receiver will lose lock and fail to work
[0003] The existing methods for obtaining the anti-jamming signal of the satellite navigation receiver have poor suppression effect on the jamming signal

Method used

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  • Method for obtaining anti-interference signal of satellite navigation receiver
  • Method for obtaining anti-interference signal of satellite navigation receiver

Examples

Experimental program
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Effect test

Embodiment 1

[0058] A method of obtaining an anti-jamming signal of a satellite navigation receiver, such as figure 1 shown, including the following steps:

[0059] S1, preprocessing the signal sent by the antenna array to obtain the intermediate frequency signal containing the interference signal that has not been completely filtered, the specific process is as follows:

[0060] S11. Input the signals sent by each antenna element of the antenna array into the low-noise amplifier respectively, and output the signal after low-noise processing. The antenna element is the antenna module, and the distribution of each antenna element forms a spherical structure. The first antenna The array elements are located on the center of the circle, that is, the distribution of each antenna array element constitutes a Y shape, the diameter of the circle is not greater than 270mm, and the distance between the antenna array elements on the circumference is d, d=0.5λ, λ is the signal sent by the antenna arra...

Embodiment 2

[0085] On the basis of embodiment 1, test the algorithm of the present invention to the suppression performance of single broadband interference signal:

[0086] The quantity of the satellite in the present embodiment is eight, and satellite transmits signal to satellite navigation receiver by antenna array, and the signal-to-noise ratio (SNR) of the signal that the setting satellite transmits is relative to noise is-29dB, then apply such as figure 2 For the single broadband interference shown, the incident direction of the single broadband interference is 50° in elevation and 100° in azimuth. Through the above settings, the signal-to-interference-plus-noise ratio (SINR) for forming a strong power is 100dB, that is, the input SINR before anti-jamming processing is -100dB.

[0087] In this embodiment, the incident azimuth angle of the first satellite signal is 10 degrees and the elevation angle is 30 degrees, the incident azimuth angle of the second satellite signal is 40 degr...

Embodiment 3

[0091] On the basis of Embodiment 2, the SNR is -29dB, and then three strong power broadband noise interferences are applied, and the interference-to-signal ratio is fixed at 90dB. In this way, the input SINR before anti-jamming processing is -90dB, and then apply such as Figure 4 For the three broadband interferences shown, the incident directions of the three broadband interferences are elevation angles of 50°, 30°, and 40°, and azimuth angles of 100°, 200°, and 280°.

[0092] Simulate the case of fixing the incident azimuth and elevation angles of the first two broadband interferences, so that the third interference changes within the entire [0°, 90°] elevation angle range and [0°, 360°] azimuth angle range, Record and sort the output SINR of the 8 satellite signals, and use the fourth largest output SINR as the output SINR of the antenna array to get Figure 5 The output SINR curve is shown.

[0093] Depend on Figure 5 It can be seen that for eight satellites, the ant...

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Abstract

The invention relates to the technical field of satellite navigation, in particular to a method for obtaining an anti-interference signal of a satellite navigation receiver. The method comprises steps: preprocessing the signal sent by the antenna array to obtain an intermediate frequency signal containing an interference signal which is not completely filtered; wherein the intermediate frequency signals are respectively used as inputs of a space-time domain algorithm and a power inversion algorithm to obtain corresponding output results; and multiplying the result output by the power inversionalgorithm by the result output by the space-time domain algorithm to obtain an anti-interference signal, namely a signal obtained by the satellite navigation receiver. According to the method, a space-time domain algorithm and a power inversion algorithm are combined, and when the signals sent by the antenna array to the satellite navigation receiver contain pulse interference, broadband interference and weak interference signals, the interference signals can be suppressed by the algorithm, so that the quality of the signals received by the satellite navigation receiver is improved.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a method for obtaining an anti-jamming signal of a satellite navigation receiver. Background technique [0002] The real-time precise position, speed, and time information provided by satellite navigation receivers play an important role in military weapons, such as the navigation and positioning system of armored vehicles, missile-borne satellite navigation receivers and air intelligence radar Beidou satellite timing / positioning equipment, etc. However, in actual communication, the electromagnetic environment is complex, and there are man-made interference with various modes and time-varying statistical characteristics, especially high-power narrowband and broadband interference, which has become one of the most important factors to destroy the communication system. Interference will prolong the acquisition time of the satellite navigation receiver and increase the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 张代省孟宪伟贾蕾王世臣王伟范兴民龚琴
Owner ANHUI SUN CREATE ELECTRONICS
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