초록 ▼

A method and apparatus for providing a radar jamming signal by simultaneously frequency-modulating a voltage-tunable oscillator with a large-amplitude, periodic, sawtooth waveform and a small-amplitude random waveform. The periodic, sawtooth modulation produces a series of radio frequency spectral l

A method and apparatus for providing a radar jamming signal by simultaneously frequency-modulating a voltage-tunable oscillator with a large-amplitude, periodic, sawtooth waveform and a small-amplitude random waveform. The periodic, sawtooth modulation produces a series of radio frequency spectral lines (subcarriers) of nearly uniform amplitude over a frequency range proportional to the peak-to-peak sawtooth amplitude. The spacing between adjacent subcarriers is equal to the fundamental sawtooth frequency. The secondary random modulation added to the primary sawtooth modulation produce simultaneous, random, frequency modulation of each of the subcarriers created by the primary modulation.

대표청구항 ▼

An apparatus to Jam preselected radar receivers comprising a voltage-tunable oscillator, means to generate a noise signal, first means to low pass filter said noise signal, second means to bandpass filter the low pass filtered signal, means to video amplify the bandpass signal at a predetermined mag

An apparatus to Jam preselected radar receivers comprising a voltage-tunable oscillator, means to generate a noise signal, first means to low pass filter said noise signal, second means to bandpass filter the low pass filtered signal, means to video amplify the bandpass signal at a predetermined magnitude, the combination of said noise generator, said first low pass filter, and said second bandpass filter and said video amplifier providing a predetermined small-amplitude random waveform, means to generate a predetermined large amplitude, periodic sawtooth waveform of a preselected fundamental frequency, a voltage-tunable magnetron being simultaneously modulated by said predetermined, small-amplitude random waveform and said predetermined large amplitude waveform, said predetermined large amplitude waveform contributing a series of subcarriers of nearly uniform amplitude over a frequency range proportional to the peak-to-peak sawtooth amplitude with the spacing between adjacent subcarriers being equal to said fundamental sawtooth frequency, said predetermined small-amplitude random waveform contributing random frequency modulation of each of said subcarriers with the predetermined small-amplitude of said random waveform being selected to Just fill in the gaps between said subcarriers to produce a continuous power spectrum between the frequency limits determined by the amplitude of the sawtooth modulation spectrum, and means to direct the output of said voltage-tunable magnetron toward said preselected radar receivers to be jammed.