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

Claim 0:
1. 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 backscattered 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 backscattered 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 transducer sub-array includes a plurality of array elements, and wherein the plurality of transducer sub-arrays are connected to a plurality of channels for the linearly combining, and
wherein the processor is configured to use a phase of a cross-correlation function at or near a lag equal to a Doppler-shifted pulse repetition interval in multiple acoustic beams to measure velocity.