Patent ID: 11906687
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An underground investigation device that investigates an underground area while moving, the underground investigation device comprising:
a transmission unit configured to transmit a pulse wave in a predetermined repetition cycle;
a reception unit configured to receive a reflected signal of the pulse wave;
a memory configured to store time waveform data of the reflected signal;
storage means having a larger capacity than a capacity of the memory;
a control unit configured to transfer the time waveform data from the memory to the storage means; and
a signal processing unit configured to generate underground investigation data based on the time waveform data stored in the storage means, wherein
the reception unit sets a measurement span for sampling the reflected signal by using, as a trigger, transmission of the pulse wave or reception of a reflected signal resulting from reflection of the pulse wave by a ground surface, samples the reflected signal in the measurement span, and stores time waveform data in the memory,
the control unit transfers the time waveform data from the memory to the storage means after the measurement span, and
the reception unit provides a trigger hold-off period in which the new measurement span is not set at least until transfer of the time waveform data is completed.