相控阵组网测控同频中继射频自干扰抑制技术

doi:10.12305/j.issn.1001-506X.2025.01.31

Abstract

Abstract:

Aiming at the self interference problem of phased array co-frequency relay nodes in measurement and control network systems, the characteristics of self-interference signals under the condition of separated transmitting and receiving antenna arrays is analyzed. Focusing on the self-interference properties after the synthesis of the receiving array antenna, a radio frequency self-interference suppression method is proposed. This method, based on the array layout and the time delay spread of self-interference signals within different-sized subarrays, equates all array elements within a certain time delay spread range into a single element, thereby reducing the analytical complexity of radio frequency interference suppression. Both theoretical analysis and simulation experiments demonstrate that radio frequency interference suppression techniques can still achieve self-interference suppression in array antennas, with performance strongly correlated to the number of taps. The selection of each tap's delay, phase, and amplitude range is dependent on the subarray partitioning. For a scenario with a 256-element transmitting array and a 256-element receiving array, simulations comparing self-interference suppression performance under different tap counts reveal that employing 16 taps can suppress self-interference signals with a carrier frequency of 26.8 GHz and a bandwidth of 200 MHz by more than 47 dB. Practical test results indicate that using 16 taps for self-interference radio frequency reconstruction achieves a self-interference suppression capability exceeding 32 dB.

Key words: phased array, networking tracking telemetering and command, relay node, co-frequency relay, radio frequency self-interference suppression

CLC Number:

Liu LIU, Tian LIU, Yang LI, Wensheng PAN, Yan ZHANG. Radio frequency self-interference suppression technology for phased array networking tracking telemetering and command relay with co-frequency[J]. Systems Engineering and Electronics, 2025, 47(1): 307-315.

Figures/Tables 17

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仿真参数	数值
载波中心频率/GHz	26.8
信号带宽/MHz	200
收发阵列规模	16×16
阵元间距/mm	5.5
收发阵列边缘间距/mm	180
单阵元发射功率/dBm	6
发射阵列等效全向辐射功率/dBm	54

发射子阵列划分	接收子阵列划分	时延扩展/ns
1×1	1×1	0.582
1×1	2×2	0.441
1×1	4×4	0.369
2×1	2×1	0.441
2×1	2×2	0.440
2×2	2×2	0.299
4×4	4×4	0.139

抽头数L	抵消前功率/dBm	抵消后功率/dBm	抑制量/dB
4	-33.3	-54.8	21.5
8	-33.3	-64.9	31.6
16	-33.3	-81.0	47.7

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Radio frequency self-interference suppression technology for phased array networking tracking telemetering and command relay with co-frequency

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