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一种高速跳频信号的数字信道化宽带接收设计
2021年电子技术应用第12期
王 杰
中国西南电子技术研究所,四川 成都610036
摘要: 跳频通信作为一种新型的通信体制,具有很强的抗截获、抗搜索、抗干扰、抗对抗等特点。美国及北约国家装备的战术信息分发系统以及地面、舰载、机载跳频电台和敌我识别系统等,均采用了跳频通信体制,具有高度的保密性和抗干扰性能。针对高速跳频信号频带宽、频点多且跳频速度快不利于快速检测的特点,提出了利用两片ADRV9009射频捷变芯片将高速跳频信号变换成零中频信号后,送FPGA经多相滤波数字信道化后完成多路通道信号接收处理的方案。该设计不仅简化了整个高速跳频信号前端宽带接收处理的流程,减小了前端模拟信道接收设备的体积,降低了系统的功耗,同时基于FPGA实现多相滤波的数字信道化设计大大增加了系统的灵活性,提高了后端高速跳频信号的检测和识别概率。
中图分类号: TN393
文献标识码: A
DOI:10.16157/j.issn.0258-7998.212183
中文引用格式: 王杰. 一种高速跳频信号的数字信道化宽带接收设计[J].电子技术应用,2021,47(12):26-30,
英文引用格式: Wang Jie. Design of digital channelized broadband receiver for high speed frequency hopping signal[J]. Application of Electronic Technique,2021,47(12):26-30,
Design of digital channelized broadband receiver for high speed frequency hopping signal
Wang Jie
Southwest China Institute of Electronic Tecnology,Chengdu 610036,China
Abstract: As a new type of communication system,FH communication has strong characteristics of anti-interception,anti-search,ant-interference and anti-antagonism. FH communication system is adopted in the tactical information distribution system,ground and shipborne and airborne FH radio stations and identification friend or Foe systems of the United states and NATO countries,which has high confidentiality and anti-interference performance.In view of the characteristics of high speed FH signal with wide frequency band,many frequency points and fast frequency hopping speed,this paper proposes to use two pieces of ADRV9009 RF agility chip to transform the high speed FH signal into zero IF signal,and then send it to PFGA through polyphase filtering digital channelization to complete the signal receiving and processing.The design not only simplifies the whole signal front-end wideband reception process,reduces the volume of the front-end analog channel receiving equipment,and reduces the power consumption of the system,but also greatly increases the flexibility of the syetem,and improves the detection and identification probability of high-speed frequency hopping signal in the end.
Key words : high speed FH signal;wideband digital receiver;ADRV9009l;poly-phase filtering process

0 引言

    通信侦察的主要任务是利用电子情报侦察手段对敌方发射的辐射源信号进行搜索与截获、分选与识别、调制参数测量和解调译码等。当前美国及北约国家的数据链均采用了高速跳频和直接序列扩频体制[1],其具有跳频速度快、频点多、带宽宽、扩频码复杂等特点,信号的捕获、跟踪和检测极为困难[2]

    针对信号的捕获跟踪,传统的侦察方式为将接收的射频信号通过模拟下变频变换到中频信号,经过AD数字采样后送数字信号处理模块完成信号的频谱计算和功率估算等,从而完成信号的检测和分选识别。该方法针对带宽小、跳速慢、频点少的信号效果较好,但针对跳频带宽、频点多的信号则处理能力不足,FPGA的资源无法满足多路信号同时下变频、滤波和频谱并行计算处理。此外,当前装备发展的趋势是低功耗、小型化方向发展,传统模拟下变频方式已经很难满足这方面的需求。




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作者信息:

王  杰

(中国西南电子技术研究所,四川 成都610036)



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