Patent ID: 6563450
Filing Date: 2003-05-13
Classification: F41G,G01S

Abstract:
In a pulse radar that is intended to transmit pulses of radio frequency energy at a staggered pulse repetition frequency, each one of such pulses containing a first and a second subpulse differing in frequency by a fixed amount, an exciter for generating successive ones of such pulses and, simultaneously, for generating reference signals for a receiver to demodulate echo signals resulting from illumination of targets by each pulse of radio frequency energy from the radar, such exciter comprising:(a) a first and a second crystal-controlled oscillator, each one thereof continuously producing an L-band signal of a different frequency; (b) switching means, operable at a selected pulse repetition frequency, for selecting the output of the first and the second crystal-controlled oscillator to produce a composite L-band signal having a first and a second part corresponding to the desired first and second subpulse of radio frequency energy; (c) a bank of crystal-controlled oscillators, each one thereof producing a different C-band signal; (d) selector means for selecting, in accordance with a predetermined program, one of the different C-band signals; and (e) mixing means for heterodyning the selected C-band signal and the existing L-band signal to generate each successive pulse of radio frequency energy to be transmitted.