Patent ID: 11879971
Assignee: TELEDYNE INSTRUMENTS, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 14:
15. An underwater active sonar system, comprising:
a plurality of transducer sub-arrays configured to spatially modulate and project a plurality of acoustic beams in different directions, receive and spatially demodulate a spatiotemporal pattern of acoustic signals corresponding to echoes of the projected acoustic beams from a plurality of scatterers while preserving the relative phase relationship of the backscattered acoustic signals; and
a processor configured to separate received acoustic signals backscattered from different ones of the projected acoustic beams, linearly combine the acoustic signals received over each of the transducer sub-arrays, and measure vehicle velocity and/or water velocity components in response to the linearly combined acoustic signals,
wherein each sub-array includes a plurality of array elements, and wherein the plurality of sub-arrays are connected to a plurality of channels for the linearly combining,
wherein the processor is configured to interpolate received acoustic signals, in at least one of time and space, to approximate bistatic invariance geometry, and to compare the interpolated received acoustic signals in pairs at or near a Doppler-shifted pulse repetition interval.