An apparatus was designed for the demodulation and correlation of a code modulated signal with respect to a reference signal in ranging systems for tracking spacecraft or aircraft, or surveying. In conjunction with simultaneous operation of three tracking stations, enough accuracy may be achieved to implement an aircraft collision avoidance system. The demodulator correlator may also be used for telemetry in a system where a transponder at a remote station delays transmission of a return code for a period proportional to an analog signal from a transducer. More than one transducer may be accommodated by using frequency division multiplexing techniques.
Digital Demodulator-Correlator
1977
35 pages
Report
No indication
English
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