Abstract: A traffic radar unit capable of looking past the lead vehicle of oncoming traffic and discovering and identifying a violator employs master and slave antennas having diverging boresights that provide overlapping relative power density radiation patterns. The radar return signal from a target of interest is received by each antenna to produce two independent Doppler signals of the same frequency which are processed by respective master and slave signal processing channels. In the illustrated embodiment, a reference boresight is established in the overlapped patterns such that a target position along the reference boresight occurs at the time that the amplitudes of the two Doppler signals are equal. Controllable high pass filters whose passbands are shifted upwardly in response to return signals of increasing amplitude attenuate stronger, lower frequency interfering signals.

Abstract: A theft alarm is provided for use in conjunction with vehicular mounted radio equipment, such as the popular but too frequently stolen citizens' band transceivers, which is responsive to either physical separation of the equipment being protected from the common electrical ground provided by the chassis of the vehicle or disconnection from such equipment of the cable by which it is normally coupled with an antenna mounted on the same vehicle.