Patent ID: 11965985
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. A laser radar device comprising:
a transmission signal generator to generate a transmission signal;
a light irradiator to convert the transmission signal generated by the transmission signal generator into transmission light, and irradiate a ranging target with the transmission light;
a reflected light receiver to receive, as reflected light, the transmission light reflected by the ranging target, and output a reception signal of the reflected light;
a first signal sequence converter to convert the transmission signal generated by the transmission signal generator into a first pulse signal sequence;
a second signal sequence converter to convert the reception signal outputted from the reflected light receiver into a second pulse signal sequence;
a range calculator to calculate a range to the ranging target from a time difference between a time at which the transmission light is irradiated by the light irradiator and a time at which the reflected light is received by the reflected light receiver; and
acceptance or refusal selecting circuitry to calculate a degree of match between the first pulse signal sequence and the second pulse signal sequence, and accept or refuse the range calculated by the range calculator on a basis of the degree of match, wherein
the transmission signal generator is configured to output time information to the second signal sequence converter, the time information indicating a time range of the transmission signal, and
the second signal sequence converter is configured to output a pulse signal included in the second pulse signal sequence to the acceptance or refusal selecting circuitry at timing at which a differentiated waveform corresponding to a derivative of the reception signal crosses zero, only during a period corresponding to the time range indicated by the time information.