Radar devices and methods using multicarrier logarithmic warped frequency domain code waveforms
AssigneeThe Research Foundation for The State University of New York
InventorsAdly T. Fam, Alexander Byrley
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Abstract
This disclosure introduces a mapping for creating good Doppler detection capable radar codes. The mapping transfers an existing digital radar code to the warped frequency domain by expressing the code elements as magnitudes and phases of selected frequencies. These frequencies are equispaced in the warped frequency domain to preserve the code's sidelobes after mapping. The frequency warping function may convert the multiplicative Doppler shift into an additive shift of the code pattern in the warped frequency domain, which allows Doppler shift detection.
Claims13
A radar receiver, comprising:
- an analog-to-digital converter to sample a received radar signal at a sampling frequency to generate a digital signal;
- a transformer for converting the digital signal to a frequency domain signal;
- a warper configured to warp positive frequencies of each of a real component of the frequency domain signal and an imaginary component of the frequency domain signal onto a logarithmic frequency axis;
- a convolver configured to convolve a matched filter with the warped frequency domain signal;
- a thresholder configured to detect a target signal in the convolved signal.
A method for receiving radar signals, comprising:
- converting a received radar signal to a digital signal at a sampling frequency;
- transforming the digital signal to a frequency domain signal;
- warping positive frequencies of each of a real component of the frequency domain signal and an imaginary component of the frequency domain signal onto a logarithmic frequency axis;
- convolving a matched filter with the warped frequency domain signal;
- and
- thresholding the convolved signal to detect a target signal.
Dependencies are inferred from the claim text.