The invention discloses a
pulsar photon timing method based on an APD
detector. An APD is used for realizing detection on weak
pulsar photons of 0.5keV to 10keV. On one hand, the
pulsar photon timing method has the advantages of high detection efficiency,
rapid response time,
high energy resolution and the like; on the other hand,
photon-generated carriers in the
detector are drifted along a pn junction direction; time
jitter caused by the
detector is relatively small, so that the pulsar photon timing method is very suitable for pulsar photon timing; a constant-ratio timing and single threshold value triggering method is adopted, so that noises are inhibited, and furthermore, an amplitude movement effect caused by different X
photon energy is eliminated; advantages that a GPS (
Global Positioning System) second pulse
signal is long and stable and an
atomic clock is short and stable are combined, and long and stable and high-precision
clock frequency is output through a correction principle; TDC (Time-Digital Convert) timing precision is kept; furthermore, pulsar photon timing errors are reduced.