全双工测控链路自干扰抑制设计与实验验证  

Design and experimental verification of self-interference suppression for full-duplex measurement and control links

作　　者：余湋[1] 张毅 张志亚[2] 沈莹[3] 潘文生 邵士海[3] YU Wei;ZHANG Yi;ZHANG Zhiya;SHEN Ying;PAN Wensheng;SHAO Shihai(Southwest China Institute of Electronic Technology,Chengdu 610036,China;Key Laboratory of Antennas and Microwave Technology,Xidian University,Xi’an 710071,China;National Key Laboratory of Science and Technology on Communications,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]中国西南电子技术研究所,四川成都610036 [2]西安电子科技大学天线与微波技术国家级重点实验室,陕西西安710071 [3]电子科技大学通信抗干扰全国重点实验室,四川成都611731

出　　处：《西安电子科技大学学报》2023年第3期182-191,共10页Journal of Xidian University

基　　金：国家自然科学基金(61901396,62071094)。

摘　　要：为解决航天测控业务日益增加与航天测控链路频谱资源紧缺之间的矛盾,提出、设计并实验验证了一种同时同频全双工测控链路的实现架构,采用空域、射频域和数字域联合的多域自干扰抵消机制,在保证测距精度的前提下,达到提升频谱效率的目的。空域自干扰抵消模块设计了共口面馈源高隔离度一体化抛物面天线,收发阵元间采用结构化扼流措施,降低了收发阵元间的耦合效应,提高了天线系统的隔离度。射频域自干扰抵消模块采用多抽头自干扰抵消方法,建立了多抽头重建射频信号模型,以残余干扰功率最小化为目标,给出了多抽头系数的最小范数解。数字域自干扰抵消模块采用重建自干扰抵消方式,建立了数字域非线性自干扰信号模型,提出了最小二乘估计非线性系数的方法。通过计算仿真和外场实验验证了全双工测控链路多域自干扰抵消架构的可行性和有效性,在确保测距精度条件下自干扰总抑制度达到156.5 dB。In order to solve the contradiction between the increasing aerospace measurement and control services and the shortage of spectrum resources for aerospace measurement and control links,an implementation architecture for co-time co-frequency full-duplex measurement and control links is proposed,designed,and experimentally verified.The links adopt a multi-domain self-interference cancellation mechanism that combines the spatial domain,radio frequency domain and digital domain,which improves the spectral efficiency under the condition that the ranging accuracy should not be reduced.For spatial self-interference cancellation,an integrated parabolic antenna with high isolation in a common surface feed is designed,and structured choke measures are adopted between the transceiver elements.The coupling effect between the transmitting and receiving elements is reduced.The isolation of the antenna system is improved.The self-interference cancellation in the radio frequency domain adopts the multi-tap self-interference cancellation method.A multi-tap reconstruction radio frequency signal model is established,and the minimum norm solution of the multi-tap coefficients is given aiming at minimizing residual interference power.In the digital domain,a nonlinear self-interference signal model is established and the least squares estimation is adopted to obtain nonlinear coefficients.In addition,this paper verifies the feasibility and effectiveness of the multi-domain self-interference cancellation architecture of the full-duplex measurement and control system through simulation and experiments.The results show that the total self-interference suppression reaches 156.5 dB with accurate distance measurement.

关 键 词：航天测控 同时同频全双工 自干扰抑制 实验验证 

分 类 号：TN92[电子电信—通信与信息系统]