Method and system using coded excitation with invertible skew-symmetric binary sequences and inverse filtering
AssigneeVanderbilt University
InventorsEmelina Prevost Vienneau, Brett C. Byram
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Abstract
One aspect of the invention relates to method and system for increasing signal-to-noise ratio (SNR) and suppressing range lobe artifacts in ultrasound imaging or sensing, active sonar, LIDAR, and/or radar. The method includes forming a coded excitation waveform with a chip waveform and a binary sequence; transmitting the coded excitation waveform into a medium of interest, and receiving signals generated from the medium of interest responsive to excitation of the coded excitation waveform; and performing pulse compression on the received signals using a decoding filter to increase the SNR and suppress the range lobe artifacts.
Claims51
A method for increasing signal-to-noise ratio (SNR) and suppressing range lobe artifacts, comprising:
- forming a coded excitation waveform with an encoding chip waveform and a binary sequence, wherein the binary sequence is an invertible skew-symmetric binary sequence or the Kronecker product of two or more such sequences, wherein the Kronecker product of two sequences a=[a1, a2, . . . aNa] and b=[b1, b2, . . . bNb] is defined as
- a⊗b=(a1b,a2b,a3b, . . . aNb)
- where the resulting sequence is of length Na×Nb;
- transmitting the coded excitation waveform into a medium of interest, and receiving signals generated from the medium of interest responsive to excitation from the coded excitation waveform;
- and
- performing pulse compression on the received signals using a decoding filter to increase the SNR and suppress the range lobe artifacts, wherein the decoding filter is convolved with a decoding chip waveform,
- wherein said performing the pulse compression comprises forming the decoding filter that serves as an inverse filter approximation for the binary sequence and a matched filter for the chip waveform.
A method for increasing signal-to-noise ratio (SNR) and suppressing range lobe artifacts, comprising:
- forming a coded excitation waveform with an encoding chip waveform and a binary sequence, wherein the binary sequence is an invertible skew-symmetric binary sequence or the Kronecker product of two or more such sequences, wherein the Kronecker product of two sequences a=[a1, a2, . . . aNa] and b=[b1, b2 . . . bNb] is defined as
- a⊗b=(a1b,a2b,a3b, . . . aNb)
- where the resulting sequence is of length Na×Nb;
- transmitting the coded excitation waveform into a medium of interest, and receiving signals generated from the medium of interest responsive to excitation from the coded excitation waveform;
- and
- performing pulse compression on the received signals using a decoding filter to increase the SNR and suppress the range lobe artifacts,
- wherein the decoding filter is convolved with a decoding chip waveform;
- and
- wherein the decoding chip waveform has a center frequency that is an integer multiple of the center frequency of the encoding chip waveform or the transmitted waveform.
A system for increasing signal-to-noise ratio (SNR) and suppressing range lobe artifacts, comprising:
- a waveform generator configured to generate a coded excitation waveform with an encoding chip waveform and a binary sequence, wherein the binary sequence is an invertible skew-symmetric binary sequence or the Kronecker product of two or more such sequences;
- a probe coupled to the waveform generator and configured to transmit the coded excitation waveform into a medium of interest, and to receive signals generated from the medium of interest responsive to excitation from the coded excitation waveform;
- and
- a signal processing unit coupled to the probe and configured to perform pulse compression on the received signals using a decoding filter to increase the SNR and suppress the range lobe artifacts, wherein the decoding filter is convolved with a decoding chip waveform, and configured to serve as an inverse filter approximation for the binary sequence and a matched filter for the chip waveform.
A system for increasing signal-to-noise ratio (SNR) and suppressing range lobe artifacts, comprising:
- a waveform generator configured to generate a coded excitation waveform with an encoding chip waveform and a binary sequence, wherein the binary sequence is an invertible skew-symmetric binary sequence or the Kronecker product of two or more such sequences;
- a probe coupled to the waveform generator and configured to transmit the coded excitation waveform into a medium of interest, and to receive signals generated from the medium of interest responsive to excitation from the coded excitation waveform;
- and a signal processing unit coupled to the probe and configured to perform pulse compression on the received signals using a decoding filter to increase the SNR and suppress the range lobe artifacts,
- wherein the decoding filter is convolved with a decoding chip waveform;
- and
- wherein the decoding chip waveform has a center frequency that is an integer multiple of the center frequency of the encoding chip waveform or the transmitted waveform.
Dependencies are inferred from the claim text.