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

Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of spaceflight timing system, and relates to a high-precision timer of a spacecraft GPS second pulse based on a hardware latch function and a timing method thereof, which are used to realize high-precision timing of the system. Background technique [0002] GPS (Global Positioning System, Global Positioning System) is a satellite-based radio navigation and positioning system developed by the United States, which can provide various users with precise three-dimensional coordinates, speed and time, and can be used in dynamic navigation and positioning, static Surveying and mapping positioning, precise timing and time synchronization and other fields. [0003] With the development of aerospace technology, the time accuracy of satellites is required to be changed. At present, a large number of satellites start to use the GPS system to realize the high-precision timing function of each satellite subsystem with th...

AI Technical Summary

Problems solved by technology

Interrupting the on-site protection time will inevitably take a certain amount of time, and it is difficult to meet the requirements of high-precision timing

[0007] (2) The interrupt method is used to record hardware pulse signals. As the number of pulse signals to be recorded increases, the number of interrupts required increases, and the software system of the interrupt processing program is complicated.

With the increase in the number of the above-mentioned pulse signals, if the interrupt method is used to implement, the more system interrupt data, the interrupt setting and the selection of interrupt priority will bring many problems to the system

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