Convolutional digital radio frequency memory (DRFM) jamming
AssigneeTextron Systems Corporation
InventorJames Joseph Jaklitsch
Life of this patent
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Abstract
A technique of jamming a victim radar includes digitizing an incident waveform received from the victim radar and convolving the digitized waveform with contents of a range trace memory. The range trace memory stores a sequence of impulses, which, when convolved with the digitized waveform, creates a corresponding sequence of delayed versions of the digitized waveform, one for each impulse in the sequence, and adds together the delayed versions to produce a single output signal. The output signal is then converted to analog form and transmitted back toward the victim radar.
Claims19
A method of jamming a victim radar, comprising:
- digitizing an incident waveform received from the victim radar;
- convolving the digitized waveform with a series of impulses of a range trace memory to produce a digital output signal;
- and
- converting the digital output signal to analog form for transmission back to the victim radar,
- wherein the incident waveform represents a radar pulse and has a duration, and wherein convolving the digitized waveform with the series of impulses of the range trace memory includes convolving the digitized waveform with at least two impulses separated in time by less than the duration of the incident waveform, and
- wherein the duration of the incident waveform extends across N range bins of the victim radar, the range bins having uniform range-bin duration, and wherein convolving the digitized waveform with the series of impulses of a range trace memory includes convolving the digitized waveform with N impulses separated in time by the range-bin duration.
A convolutional digital radio frequency memory (DRFM) jammer, comprising:
- an analog-to-digital converter (ADC) constructed and arranged to digitize an incident waveform received from a victim radar;
- a convolution processor constructed and arranged to convolve the digitized waveform with a series of impulses of a range trace memory to produce a digital output signal;
- and
- a digital-to-analog converter constructed and arranged to convert the digital output signal to analog form for transmission back to the victim radar,
- wherein the incident waveform represents a radar pulse and has a duration, and wherein the convolution processor constructed and arranged to convolve the digitized waveform with the series of impulses of the range trace memory is further constructed and arranged to convolve the digitized waveform with at least two impulses separated in time by less than the duration of the incident waveform, and
- wherein the duration of the incident waveform extends across N range bins of the victim radar, the range bins having uniform range-bin duration, and wherein the convolution processor constructed and arranged to convolve the digitized waveform with the series of impulses of a range trace memory is further constructed and arranged to convolve the digitized waveform with N impulses separated in time by the range-bin duration.
Dependencies are inferred from the claim text.