Celestial integrated navigation system time synchronization method

Abstract

The invention provides a celestial integrated navigation system time synchronization method. The celestial integrated navigation system time synchronization method comprises that the FPGA (field programmable gate array) of a celestial integrated navigation system receives one or more from effective PPS (pulses per second) of a GNSS (global navigation satellite system), PPS of an external timing source and PPS of a microchip atomic clock, and through PPS synchronization, acquires the PPS applied by the celestial integrated navigation system; the FPGA of the celestial integrated navigation system receives the effective coordinated universal time and the time of the external timing source simultaneously and takes the synchronized PPS as a timing initializing reference to acquire an internal system time, thereby meeting the demands of the celestial integrated navigation system on time precision. The celestial integrated navigation system time synchronization method avoids affecting the data sampling synchronization of the entire system, products sampling pulses and times with different frequency and achieves assessment as well as real-time adjustment of system precision of every unit time.

Description

technical field [0001] The invention relates to a time synchronization method, which belongs to the technical field of integrated navigation, and can be used for time synchronization of astronomical integrated navigation systems, and can also be used for time synchronization of other integrated navigation systems. Background technique [0002] Celestial Navigation (CNS) is based on natural celestial bodies with known accurate spatial positions, passively detects the position of celestial bodies through astrometric instruments, and determines the navigation information of the carrier where the measurement point is located through calculation. [0003] Since the orientation from the earth to the stars remains basically unchanged, astrometric instruments are equivalent to gyroscopes without drift in inertial navigation systems, so astronomical navigation is very suitable for long-term autonomous operation and high navigation and positioning accuracy, such as: Long-range reconna...

AI Technical Summary

Problems solved by technology

However, due to the influence of its own inertial device error drift, the navigation error of the inertial navigation system accumulates over time, which is not suitable for long-endurance carrier platforms

Satellite navigation positioning and timing accuracy are high, but it cannot provide attitude, and is susceptible to interference, and its availability in wartime is low

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