交替极化阵列对消盲区分析与验证

doi:10.12305/j.issn.1001-506X.2024.01.06

Abstract

Abstract:

When the space and polarization domain characteristics of the interference signal are similar to the target signal, the space-polarization joint anti-jamming technology can eliminate the interference, while it also inhibits the target signa. As a result, the signal to interference plus noise ratio (SINR) after interference cancellation is lower than the requirement of the radar system, and the interference cancellation blind area is formed. Aiming at this phenomenon, the mathematical expressions of the location and size cancellation blind area for polarization sensitive array has been derived by establishing the space model, the polarization model, and the space-polarization model of cancellation blind area for alternate polarization array. And a mathematical representation method of cancellation blind area for alternate polarization array has been proposed. Furthermore, the distribution rule and influencing factors of cancellation blind area for alternate polarization array has been analyzed. It is found that the element spacing can significantly affect the distribution of the cancellation blind area and under the same conditions the cancellation blind area of alternate polarization array is larger than the cancellation blind area of concurrent polarization array. It showed that the alternate polarization array reduces the cost of the equipment by reducing the number of antennas, but increases the cancellation blind area. Then, the numerical simulation is carried out based on the blind zone model. And the simulation results verify the theoretical analysis. Finally, an experimental platform is built by using the channel emulator. The cancellation blind area measured by channel emulator experiment is basically consistent with the theoretical value, which proves the validity of the analysis conclusion again.

Key words: alternate polarization array, space-polarization joint anti-jamming, interference cancellation, cancellation blind area

CLC Number:

TN974

Hongzhang GAO, Songhu GE, Yu GUO, Rang LIU, Jin MENG. Analysis and verification of cancellation blind area with alternate polarization array[J]. Systems Engineering and Electronics, 2023, 46(1): 51-61.

Figures/Tables 11

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Table 1

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阵元间距	仿真空域盲区/(°)	实验空域盲区/(°)
0.25λ	(0, 11.3)	(0, 10.9)
0.5λ	(0, 5.6) (64.1, 90)	(0, 6.5) (64.2, 90)
0.75λ	(0, 3.8) (36.8, 47.2)	(0, 4.1) (36, 47.8)

阵元间距	方位角/(°)	仿真极化域盲区/(°)	实验极化域盲区/(°)
0.5λ	0	(73, 90)	(72, 90)
0.5λ	30	-	-
0.5λ	70	(54, 90)	(53, 90)
0.75λ	0	(76, 90)	(73, 90)
0.75λ	40	(74, 90)	(69, 90)
0.75λ	70	-	-

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Analysis and verification of cancellation blind area with alternate polarization array

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