Target detection device and target detection method
AssigneeFuruno Electric Co., Ltd.
InventorsYasunobu ASADA, Shinya TANIMURA
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Abstract
A target detection device is provided. The target detection device includes a transmission array having a plurality of transmission transducer elements. The target detection device further includes a signal generator. The signal generator generates a plurality of transmission signals. The signal generator further changes a phase of a base signal by a phase shift amount that changes over time for generating each of the plurality of transmission signals. Furthermore, the signal generator provides inputs to each transmission transducer element of the plurality of transmission transducer elements with one of the plurality of transmission signals.
Claims19
A target detection device, comprising:
- an underwater acoustic transmission array having a plurality of underwater acoustic transmission transducer elements;
- and
- a signal generator configured to:
- steer an underwater acoustic transmission wave emitted by the plurality of underwater acoustic transmission transducer elements,
- wherein, to steer the underwater acoustic transmission wave, the signal generator is configured to:
- generate a plurality of transmission signals by changing a phase of a base signal over time in accordance with one of a plurality of phase shift/time relationships, each of the plurality of phase shift/time relationships corresponding to a respective one of the plurality of underwater acoustic transmission transducer elements;
- input to each underwater acoustic transmission transducer element of the plurality of underwater acoustic transmission transducer elements a corresponding generated transmission signal of the plurality of transmission signals;
- and
- transmit the underwater acoustic transmission wave from the underwater acoustic transmission array,
- wherein the signal generator is further configured to change the phase of the base signal for the generation of the plurality of transmission signals so as to change an emission direction of the underwater acoustic transmission wave non-linearly with time.
A target detection method performed by a target detection device having an underwater acoustic transmission array comprising a plurality of underwater acoustic transmission transducer elements, the target detection method comprising:
- steering an underwater acoustic transmission wave emitted by the plurality of underwater acoustic transmission transducer elements, wherein the steering comprises:
- generating a plurality of transmission signals by changing a phase of a base signal over time in accordance with one of a plurality of phase shift/time relationships, each of the plurality of phase shift/time relationships corresponding to a respective one of the plurality of underwater acoustic transmission transducer elements;
- inputting a corresponding generated transmission signal of the plurality of transmission signals into one of the plurality of underwater acoustic transmission transducer elements;
- and
- transmitting the underwater acoustic transmission wave from the underwater acoustic transmission array,
- wherein generating the plurality of transmission signals by changing the phase of the base signal is performed so as to change an emission direction of the underwater acoustic transmission wave non-linearly with time.
Dependencies are inferred from the claim text.