| 摘要 |
1. A continuous wave radar system comprising a transmitting channel and a receiving channel, a first heterodying means included in said receiving channel to convert the received signal to an intermediate frequency, a reference signal channel including a second heterodyning means coupled to said transmitting channel for converting a portion of the transmitted signal to an intermediate frequency, phase comparison means coupled to the intermediate frequency outputs of said receiving and said reference channels for producing an output proportional to the phase relationship between the channels, phase adjusting means included in said reference channel and coupled to said phase comparison means for maintaining a fixed phase relationship between channels, amplitude comparison means coupled to the intermediate frequency outputs of said receiving and said reference channels, amplitude adjusting means included in said reference channel and coupled to said amplitude comparison means for maintaining a fixed amplitude relationship between said channels, circuit means for applying a portion of said reference signal to said receiving channel in opposition to cancel the noise component of said received signal, a detector coupled to said receiver channel and to said reference channel to provide an output proportional to the doppler frequency difference between the received signal and the reference signal.
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