| 摘要 |
The radar apparatus disclosed herein employs a super-regenerative oscillator for detecting the presence of a target at a preselected range or distance. The bias signal which controls the nominal squeg period of the oscillator is repetitively switched between two levels corresponding to respective predetermined ranges. A reference signal is provided in synchronism with the switching. A reduction in the random noise generated by the oscillator is taken as indicative of the presence of a target at the preselected range corresponding to the squeg rate at which the oscillator is then operating. The reference signal and a signal representing the noise amplitude are combined such a way that a null is obtained when a target is present at the range corresponding to a predetermined one of the two squeg rates.
|
