Reception time determining apparatus and distance measuring apparatus using the same

摘要

The reception time determining apparatus which measures a reception time of a transmission signal from a transmitter is characterized by
a transmission signal, which produces a demodulation signal containing therein a signal change portion for which a singularity exists locally in the signal change portion,
a demodulation section which demodulates a reception signal and outputs the demodulation signal;
a signal change portion detection section which detects the signal change and outputs a singularity detection signal as a signal change portion detection signal; the signal change portion detection section being constructed with a singularity detection section;
and
a first time measurement section which measures a reception time of the reception signal based on the singularity detection signal which is output from the singularity detection section,
wherein the singularity being detected is a discontinuity appearing in an M-th order differential of a waveform of the demodulation signal.