Bae Systems Information and Electronic Systems Integration Inc.

Raytheon Company

Arthur J Tardif

James M Huggett

Kevin S Bassett

Danny A Barnum

Samuel D Anthony

A system and method for detecting unknown signals that may be radar pulses is presented. The method includes conjugate multiplying a first signal with a second signal to produce a first multiplied signal and conjugate multiplying the second signal with a third signal to produce a second multiplied signal. The first and second signals are orthogonal and the second and third signals are orthogonal. The radar pulse is contained in all three signals but each signal has noise components. The first multiplied signal is integrated to produce a first integrated signal and the second multiplied signal is integrated to produce a second integrated signal. The first and second integrated signals are summed to produce a summed signal. A location of a peak power of the summed signal is then detected. A TOA of the of the radar pulse is then detected based on the location of the peak power.

Orthogonal polarization signal agnostic matched filter

A system and method for detecting unknown signals is presented. A system includes a receiver, a multiplier logic, integrator logic and a peak detection logic. The receiver receives a first radio frequency (RF) input containing an unknown signal and first noise and a second RF radio input containing the same unknown signal and a second noise. The second RF input is orthogonally polarized with respect to the first RF input. The multiplier logic multiplies the first RF input with a conjugate of the second RF input to produce a multiplied signal. The integrator logic integrates the multiplied signal to product an integrated signal. The peak detection logic determines a coarse time of arrival (TOA) of a unknown signal located in the integrated signal based, at least in part, on a peak power in the integrated signal.

Signal agnostic matched filter parameter estimator

A radar warning receiver is implemented in low cost integrated circuit form utilizing only one analog component, namely a limiting amplifier. By taking the output of the limiting amplifier and utilizing monobit sampling of the output it has been found that one can provide an integrated circuit single chip radar warning receiver using delay correlation to extract frequency, amplitude and modulation type from signals at or below the noise level.

Monobit based low cost high performance radar warning receiver

A digital sound synthesizer produces a variable spectral line width to synthesize tones by accumulating phase quanta sequentially for each of a set of tone samples. The rate of accumulation of phase for each tone is randomly altered with preset values of phase increment to broaden the spectral line. The broadened spectral lines provide a display with a spectral presentation of sounds more closely resembling naturally occurring sounds. The embodiment shows how one-hundred non-harmonic frequencies can be generated (using integrator 64), each of which can be independently amplitude controlled and band-width modulation controlled using random deviation of a sine wave.

Digital sound synthesizer

A broadband doppler simulator is described in which signals from a plurality of hydrophones are simulated by selecting storage addresses of a random access memory whose successive addresses contain samples of an input signal. The range of each hydrophone from the target whose signal it is receiving is determined by the address assigned to the hydrophone relative to the address of the input signal in the random access memory. In order to produce a doppler shift (time compression/expansion), the address of the simulated hydrophone signal is changed with respect to the signal which is being stored in the memory. The rate at which the address of the simulated hydrophone signal is being changed relative to the input signal determines the doppler shift. In order to reduce the size of the random access memory while retaining the ability to change the apparent doppler shift with a higher resolution as well as maintain signal distortion below an acceptable limit, an interpolation technique is used to obtain signals corresponding to delays which are smaller than the delay between adjacent addresses.

Growing community of inventors

Amherst, NH, United States of America

Arthur J Tardif