发明名称 |
METHOD FOR GENERATING ANTENNA TRACKING SIGNALS |
摘要 |
A method for producing antenna follow-up signals in which a sum signal and a difference signal are derived from a received beacon signal and an amplitude modulated signal is produced by superposition from these two signals. The amplitude modulated signal is converted into another frequency by means of a mixer which receives both the amplitude modulated signal and a mixing signal. The converted amplitude modulated signal is fed to an amplitude detector via a narrowband bandpass filter which permits only the signal frequency to pass. A voltage controlled oscillator is cyclically switched to produce a mixing signal which is fed to the mixer and which cyclically changes its frequency between two frequencies for the duration of each phase state of the difference signal. The converted signal at the output of the mixer changes its frequency between two further frequencies in response to the change of frequency of the mixing signal. The frequency of the voltage controlled oscillator is controlled with a control voltage that is derived from a difference between attenuations suffered by the converted amplitude modulated signal in the bandpass filter at the two further frequencies of such converted signal. |
申请公布号 |
DE3662315(D1) |
申请公布日期 |
1989.04.13 |
申请号 |
DE19863662315 |
申请日期 |
1986.02.14 |
申请人 |
ANT NACHRICHTENTECHNIK GMBH |
发明人 |
STEINERT, WOLFGANG, DIPL.-ING. |
分类号 |
G01S3/42;G01S3/32;H01Q25/02;(IPC1-7):G01S3/32 |
主分类号 |
G01S3/42 |
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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