| 摘要 |
PROBLEM TO BE SOLVED: To detect a low Doppler target with high resolution under noise and reverberation by analyzing a frequency characteristic of a noise and reverberation level in a propagation path to a movement target and adaptably controlling a transmission/receipt signal for minimizing noise and reverberation energy. SOLUTION: A first transmitting unit 20 generates a transmitting signal to be converted into a sound signal. A first receiving unit 30 inputs a receiving signal converted from a reflecting signal and divides the receiving signal frequency band so as to output a band split signals. A first signal processing unit 40 carries out correlation process between a transmission replica signal inputted from the first transmitting unit 20 for serving as a comparison reference signal and the band split signal in every split band, square-law detection, and Doppler frequency detection. On the basis of output signals provided from square-law detection and Doppler frequency detection, the first transmitting unit 20 analyzes a frequency characteristic of a noise and reverberation level of a propagation path to a movement target and adaptably controls the transmitting signal for minimizing noise and reverberation energy.
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