发明名称 |
Phase modulation apparatus |
摘要 |
Phase modulation apparatus particularly suitable for coherent radar applications wherein an interrupted carrier-wave is phase modulated according to a predetermined coded sequence. Apparatus comprises a carrier wave generator having an output for connection to an aerial, a delay line suitably coupled at one end to the output of the generator, and a modulation signal generator for controlling the reflecting actions of a reflector at the other end of the delay line so that signals travelling in the delay line are reflected with a phase-shift dependent on the signal produced by the modulation signal generator. The carrier-wave generator is switched on and off for transmit and receive periods respectively and when switched on its output signal will build up from noise levels injection-phase-locked to a delayed version of the previous transmitted signal, thus preserving phase coherence between successive transmitted signals.
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申请公布号 |
US4019185(A) |
申请公布日期 |
1977.04.19 |
申请号 |
US19730365090 |
申请日期 |
1973.05.23 |
申请人 |
THE SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND |
发明人 |
MORGAN, ARTHUR PICTON |
分类号 |
G01S13/26;H03C3/00;(IPC1-7):G01S7/28;G01S9/38 |
主分类号 |
G01S13/26 |
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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