초록 ▼

A radio frequency interferometer/Doppler target location system comprising in one embodiment a wave source on a target vehicle which is tracked by a radio frequency interferometer located at a known situs. The radio frequency interferometer generates signals representing the azimuth angle, elevation

A radio frequency interferometer/Doppler target location system comprising in one embodiment a wave source on a target vehicle which is tracked by a radio frequency interferometer located at a known situs. The radio frequency interferometer generates signals representing the azimuth angle, elevational angle and Doppler shift of the source. The Doppler shift is a direct measurement of the velocity of the target vehicle in wavelengths per second and therefore if the Doppler cycles are counted from the time the target vehicle is launched, its range can be determined at any desired time. The azimuth angle signal, elevation angle signal and the Doppler shift signal are then transmitted to a processor where the information is converted into any desired format to indicate the position of the tracked vehicle.

대표청구항 ▼

A target location system, having a combination of an RF interferometer and doppler receiver, comprising: a source for generating an RF signal; receiver circuit means for receiving said RF signal and generating a first signal representing the elevation angle of one of said source and said receiver ci

A target location system, having a combination of an RF interferometer and doppler receiver, comprising: a source for generating an RF signal; receiver circuit means for receiving said RF signal and generating a first signal representing the elevation angle of one of said source and said receiver circuit means, a second signal representing the azimuth angle of one of said source and said receiver circuit means and a third signal representing the range of one of said source and said receiver circuit means; at least three antennas; at least three mixer circuits, each said mixer circuits connected to a respective antenna; an oscillator, connected to each of said mixer circuits, for heterodyning the signals from said antennas; at least first, second and third doppler amplifiers, each said doppler amplifier connected to a respective mixer circuit for amplifying the signal from a respective mixer circuit; a first phase detector, connected to said first and second doppler amplifiers, for generating said first signal; a second phase detector, connected to said second and third doppler amplifiers, for generating said second signal; a doppler counter means, connected to said third doppler amplifier, for generating said third signal.