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) |
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A novel approach of high sensitivity receiving and testing for range millimeter-wave signal |
CHEN Xi,XU Jian-zhong,WU Li,YANG Jian |
() |
Abstract: |
According to the actual demand of weak signal (as low as -128 dBm) detectio
n in millimeterwave range test, through the analysis of signaltonoise rati
o(SNR), the Wband receiver system with -128 dBm sensitivity is realized by
using
the technology of superheterodyne broadband multichannel fast sweptfrequen
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 Wband is put forward. Theoretical an
alysis shows that the minimum power of the millimeterwave signal source can re
ach -128 dBm in Wband when the test distance is 290 m and the correspo
nding attenuation value is about -121.5 dB. The practical measurements using
the calibrated millimeterwave 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 |