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靶场毫米波信号高灵敏度接收与测试新方法
陈曦,许建中,吴礼,杨健
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(南京理工大学电子工程与光电技术学院，南京 210094;解放军73691部队，南京 210014)

摘要:

基于靶场毫米波测试中微弱信号（低至-128 dBm）检测的实际需求，通过信噪比分析，采用外差式宽带多通道快速扫频复合信道化技术，在W频段实现了-128 dBm接收灵敏度的测试系统。同时，设计了毫米波信标源并利用空间衰减理论，提出了一种W频段高灵敏度（- 128 dBm）测试的新方法。理论分析表明，测试距离为290 m、相应的衰减值约为-1 21.5 dB时，可提供一个功率最小达到-128 dBm的W频段毫米波信号源。利用标定后的毫米波信号源进行外场实际测量，证明了该测试方法的可行性。

关键词: 靶场测试高灵敏度毫米波源空间衰减微弱信号检测 W 频段信噪改善比

DOI：

基金项目:中国博士后科学基金资助项目（20100481151）

A novel approach of high sensitivity receiving and testing for range millimeter-wave signal

CHEN Xi,XU Jian-zhong,WU Li,YANG Jian

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Abstract:

According to the actual demand of weak signal (as low as -128 dBm) detectio n in millimeterwave range test, through the analysis of signaltonoise rati o(SNR), the Wband receiver system with -128 dBm sensitivity is realized by using the technology of superheterodyne broadband multichannel fast sweptfrequen cy composite channelization. Meanwhile, the millimeter-wave calibration source i s designed, and combined with the spatial attenuation theory, a new test method of the high sensitivity (-128 dBm) in Wband is put forward. Theoretical an alysis shows that the minimum power of the millimeterwave signal source can re ach -128 dBm in Wband when the test distance is 290 m and the correspo nding attenuation value is about -121.5 dB. The practical measurements using the calibrated millimeterwave signal source demonstrate the feasibility of th e proposed test method.

Key words: range test high sensitivity millimeter wave source spatial attenuation weak signal detection W band signal to noise interference ratio