发明名称 |
FFT-based filtering for low-quality signal direction finding |
摘要 |
A radio direction finding system for a low signal quality transmission signal performs a Fast Fourier Transform (FFT) on an entire received RF band into a number of FFT bins, each serving as an IF filter. The contents of each FFT bin are demodulated to decode a frequency signature from the encoded RF signal. A signal-to-noise ratio comparator receives the FFT baseband samples and determines the signal level from the known frequency signature. The FFT baseband buffer with the greatest SNR corresponding to a particular FFT frequency bin is outputted as a direction finding metric.
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申请公布号 |
US6469657(B1) |
申请公布日期 |
2002.10.22 |
申请号 |
US20010972874 |
申请日期 |
2001.10.10 |
申请人 |
ITT MANUFACTURING ENTERPRISES, INC. |
发明人 |
FOX NEIL DAVID |
分类号 |
G01S3/74;(IPC1-7):G01S13/42 |
主分类号 |
G01S3/74 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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