Method for unifying time in wide area of space, space time-keeping system

A space timekeeping system, comprising a plurality of local area timekeeping systems, wherein each of the local area timekeeping systems comprises an information processing device, a proper time measuring device, and a pulsar pulse measuring device;

• the information processing device is configured to establish a wide area inertial coordinate system, which comprises all local area coordinate systems within a spatial range covered by a unified time;
• the proper time measuring device is configured to obtain a local proper time;
• and the information processing device is further configured to establish a local orbit parameter ephemeris by taking the local proper time as a time argument;
• the pulsar pulse measuring device is configured to observe a pulse profile of a pulsar according to the local proper time to obtain a pulse data sequence with the local proper time as the time argument;
• and the information processing device is further configured to determine a pulse local time according to the pulse data sequence with the local proper time as the time argument, wherein the pulse local time is a coordinate time at which the pulse of the pulsar arrives at a local position;
• and
• the information processing device is further configured to convert the pulse local time by using the local orbit parameter ephemeris so as to obtain a pulse origin time, wherein the pulse origin time is a coordinate time at which the pulse arrives at an origin of the wide area inertial coordinate system:,
• wherein the proper time measuring device comprises a cesium atomic clock, and the pulsar pulse measuring device comprises a receiver for measuring X-rays on satellites;
• thus achieving time unification among the plurality of local area timekeeping systems.