Abstract: A frequency-modulated continuous-wave collision avoidance radar responsive to both reply signals from cooperating (tagged) targets and to skin reflections from proximate non-cooperating (non-tagged) targets.
Abstract: An electronic license tag or plate formed into a unitary structure and including a single antenna system cooperating in a system comprising a harmonic radiator which transmits a pulse coded identification signal in response to an interrogation signal, and in a signal communication path for detecting and decoding code modulations in the interrogation signal and deriving therefrom an information signal which is communicated to the operator of a vehicle to which the tag or plate is affixed.
Abstract: A controlled interval pulse train generator comprising a plurality of three terminal transferred electron logic devices, and a delay line. The generator produces a train of small pulse-width voltage pulses at intervals determined by the delay line. The pulse train is started in response to an initial pulse and is terminated in response to a voltage step.
Abstract: A semipassive responder for use in a communication system wherein an interrogating unit transmits an interrogation signal to illuminate the responder. The responder generates, in response to incident interrogation signals, a phase-coded reply signal, utilizing a low voltage, low power-drain reflective varactor phase modulator.
Abstract: A linear amplifier for an amplitude modulated RF input signal wherein the DC output-port bias voltage is varied in accordance with the current into the DC output-port to prevent amplitude and phase distortion of the output signal. Amplifiers utilizing bipolar and field effect transistors are disclosed.