发明名称 |
Locating the source of an unknown signal |
摘要 |
A method of locating the source of an unknown interference signal of varying frequency received by receive antennas (16, 18) via relay satellites (12, 14) involves downconversion of received signals to a first intermediate frequency (IF) and band-limiting the downconverted signals. The band-limited signals are constrained to lie within a prearranged acquisition signal bandwidth by adjustment of local oscillator (LO) downconversion frequency to counteract frequency change in the unknown signal. Downconverted signals are offset in time relative to one another using trial values of differential time offset and their correlation is determined for each trial value to provide actual time offset. Compensation is provided for change in correlation phase angle, which results from signals being downconverted experiencing different LO frequencies during the time interval of the trial offset. The method and associated system may be particularly useful in identifying interference sources in satellite communication channels. |
申请公布号 |
GB2373940(A) |
申请公布日期 |
2002.10.02 |
申请号 |
GB20010007610 |
申请日期 |
2001.03.27 |
申请人 |
* THE SECRETARY OF STATE FOR DEFENCE;* QINETIQ LIMITED |
发明人 |
ROBERT MARTIN * RIDEOUT;PAUL RICHARD * EDMONDS;SIMON ROBERT * DUCK |
分类号 |
H04B7/185;G01S1/02;G01S5/06;(IPC1-7):G01S5/06 |
主分类号 |
H04B7/185 |
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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