Celestial integrated navigation system time synchronization method

An integrated navigation system and time synchronization technology, applied in radio wave measurement system, satellite radio beacon positioning system, navigation through speed/acceleration measurement, etc., can solve the problem of being susceptible to interference, low availability, and unsuitable for long-duration carriers Platform and other issues

Inactive Publication Date: 2019-05-24
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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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-enduranc

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  • Celestial integrated navigation system time synchronization method
  • Celestial integrated navigation system time synchronization method
  • Celestial integrated navigation system time synchronization method

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0023] The present invention synchronizes received PPS (PPS of GNSS, PPS of external timing source, PPS of microchip atomic clock) and time (UTC time of GNSS, time of external timing source) through FPGA, and uses synchronized PPS and time as system time Timing base. According to the time synchronization requirements of different sensor units, FPGA generates different sampling pulses, clocks, and times as the sensor time synchronization reference, realizing the time synchronization of satellite navigation, INS, CNS, turntable and other sensor units in the astronomical integrated navigation system, and improving the accuracy of data sampling and system accuracy.

[0024] Concrete steps of the present invention are as follows:

[0025] (1) Synchronization of PPS second puls...

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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...

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Application Information

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IPC IPC(8): G01S19/47G01C21/16
Inventor 王健党进伟颜开思
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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