导航接收机噪声电磁辐射阻塞效应分析

doi:10.12305/j.issn.1001-506X.2022.10.27

Abstract

Abstract:

Aiming at the phenomenon that the satellite navigation system loses its positioning caused by electromagnetic radiation, an effect evaluation model of electromagnetic radiation noise based on interference mechanism analysis is established. The effect experiment and the analytical evaluation on the navigation receiver are performed. In order to solve the problem that the sensitivity data of the navigation receiver is difficult to be accurately measured due to weak working signals in the environment to be evaluated, two-point calibration is carried out on sensitivity data by using the working frequency point and a relatively stable frequency point of out-of-band. The effects index of both random noise and single-frequency compound noise is greater than 1 after calibration. The maximum error is 1. 8 dB, which is conformed to the theoretical analysis of the effects evaluation model and is consistent with the experimental phenomenon. The results show that the proposed effect evaluation model of electromagnetic radiation noise can be used for in-band and out-of-band noise interference effects evaluation simultaneously, while the proposed two-point calibration method is of great significance to improve the effects evaluation accuracy of tested equipment with weak working signals.

Key words: navigation receiver, electromagnetic radiation, noise interference, calibration, effects evaluation

CLC Number:

TM937

Mei LI, Guanghui WEI, Hongze ZHAO, Jianyong ZHENG, Xue DU. Analysis of blocking effects of electromagnetic radiation noise on navigation receiver[J]. Systems Engineering and Electronics, 2022, 44(10): 3221-3227.

Figures/Tables 7

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References 31

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噪声类型	校准点单频阻塞功率/ dBm	复合信号单频临界干扰功率/dBm	效应指数R_I	相对误差/dB
随机噪声	P_s0=-71 P_s1=-56.5	—	1.4	1.5
随机噪声	P_s0=-71 P_s1=-56.5	—	1.4	1.5
单频复合噪声	P_s0=-66 P_s1=-52	P_n0=-66.1	1.5	1.8
单频复合噪声	P_s0=-66 P_s1=-52	P_n1=-53.5	1.2	0.8

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Analysis of blocking effects of electromagnetic radiation noise on navigation receiver

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