Device, method and program for processing signal, underwater detecting device and radar apparatus
First Claim
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1. A signal processor for processing a target echo signal obtained based on a reflection wave caused by a reflection of a transmission wave on a target object, comprising:
- processing circuitry configured to;
generate a filtered echo signal by extracting echo signal components within a predetermined frequency band from the target echo signal;
generate a high resolution signal based on the target echo signal, the high resolution signal having higher resolution than the filtered echo signal;
partition a distance range into a first zone where an intensity of a first sample sampled from the high resolution signal is the same as or higher than an intensity of a second sample sampled from the filtered echo signal, said first and second samples being corresponding samples, and a second zone where the intensity of the first sample is lower than the intensity of the second sample, said distance range corresponding to a time length from transmission of the transmission wave until reception of the reflection wave; and
synthesize the filtered echo signal with the high resolution signal in each of the first and second zones and generate an echo image from the synthesized filtered echo signal and high resolution signal in each of the first and second zones, wherein the generated echo image comprises reduced false images while maintaining resolution of the echo image generated, in order to improve target detection images.
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Abstract
A signal processor for processing target echo signal is provided. The signal processor includes a filter configured to generate a filtered echo signal by extracting echo signal components within a predetermined frequency band from the target echo signal, a high resolution signal generator configured to generate a high resolution signal based on the target echo signal, and a synthesizing module configured to synthesize the filtered echo signal with the high resolution signal. The high resolution signal has higher resolution than the filtered echo signal.
16 Citations
14 Claims
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1. A signal processor for processing a target echo signal obtained based on a reflection wave caused by a reflection of a transmission wave on a target object, comprising:
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processing circuitry configured to; generate a filtered echo signal by extracting echo signal components within a predetermined frequency band from the target echo signal; generate a high resolution signal based on the target echo signal, the high resolution signal having higher resolution than the filtered echo signal; partition a distance range into a first zone where an intensity of a first sample sampled from the high resolution signal is the same as or higher than an intensity of a second sample sampled from the filtered echo signal, said first and second samples being corresponding samples, and a second zone where the intensity of the first sample is lower than the intensity of the second sample, said distance range corresponding to a time length from transmission of the transmission wave until reception of the reflection wave; and synthesize the filtered echo signal with the high resolution signal in each of the first and second zones and generate an echo image from the synthesized filtered echo signal and high resolution signal in each of the first and second zones, wherein the generated echo image comprises reduced false images while maintaining resolution of the echo image generated, in order to improve target detection images. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13)
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12. An underwater detecting device, comprising:
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a receiver configured to receive a target echo signal to be processed, the target echo signal being caused by an acoustic wave transmitted underwater; a signal processor including processing circuitry configured to process the target echo signal received by the receiver; and a display unit configured to display a synthesized signal, wherein the processing circuitry of the signal processor is configured to; generate a filtered echo signal by extracting echo signal components within a predetermined frequency band from the target echo signal; generate a high resolution signal based on the target echo signal, the high resolution signal having higher resolution than the filtered echo signal; synthesize the filtered echo signal with the high resolution signal and generate the synthesized signal; detect a depth position of a water bottom; and specify a target range within which the processing circuitry synthesizes the filtered echo signal with the high resolution signal, the target range being a predetermined depth range including the depth position of the water bottom and generate an echo image from the synthesized filtered echo signal and high resolution signal in the target range, wherein the generated echo image comprises reduced false images while maintaining resolution of the echo image generated, in order to improve underwater images.
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14. A method of processing a target echo signal obtained based on a reflection wave caused by a reflection of a transmission wave on a target object, the method comprising:
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generating a filtered echo signal by extracting echo signal components within a predetermined frequency band from the target echo signal; generating a high resolution signal based on the target echo signal, the high resolution signal having higher resolution than the filtered echo signal; partitioning a distance range into a first zone where an intensity of a first sample sampled from the high resolution signal is the same as or higher than an intensity of a second sample sampled from the filtered echo signal, said first and second samples being corresponding samples, and a second zone where the intensity of the first sample is lower than the intensity of the second sample, said distance range corresponding to a time length from transmission of the transmission wave until reception of the reflection wave; and synthesizing the filtered echo signal with the high resolution signal in each of the first and second zones and generating an echo image from the synthesized filtered echo signal and high resolution signal in each of the first and second zones, wherein the generated echo image comprises reduced false images while maintaining resolution of the echo image generated, in order to improve target detection images.
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Specification