High-precision GPS (Global Positioning System) 1pps (1 Pulse Per Second) timer and timing method of spacecraft

The invention relates to a high-precision GPS (Global Positioning System) 1pps (1 Pulse Per Second) timer of a spacecraft. Time is recorded by a system timer according to relevant pulse signals with a hardware latch technology. For the first time, a pulse receiving module, a timer latch control module, a register block, a timing module and a timer are all utilized for timing of the pulse signals. Signal timing is realized by a hardware latch mode instead of a traditional software interrupt way. A time error is only limited to a hardware transmission error, and the hardware transmission error can be neglected in comparison to interrupt response time. The accuracy and the stability of the utilization of the GPS 1pps signal in timing are largely improved, and the requirement of the spacecraft on high precision signal timing is met.