Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1997-05-02
1998-10-13
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367119, 367901, G01S 386
Patent
active
058222766
ABSTRACT:
A broadband sonar system is configured to be coupled to a narrow band sonar sensor array having a plurality of sensor groups configured in subarrays. Each of the sensor groups within a subarray is spaced equidistantly from adjacent sensor groups within the same subarray. The sonar system includes a plurality of signal compensation filters, each being coupled to a respective one of the sensor groups for receiving signals from the respective sensor group and weighting the signals to generate respective output signals. The weighting of the signal from a first sensor group having a first SNR is greater than the weighting for the signal from a second sensor group that has a second SNR when the first SNR is greater than the second SNR, so as to maximize the SNR of the array. At least one broadband beamformer is coupled to the signal compensation filters for combining the output signals for determining ranges to targets.
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patent: 5680371 (1997-10-01), Miklovic
"Frequency-Independent Beamformer with Low Response Error", Thomas Chou, 1995 IEEE, Publication Date: Sep. 5, 1995.
Arete Engineering Technologies Corporation
Lobo Ian J.
Rogitz John L.
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