Synchronizing pulse synthesizing method and synchronizing pulse synthesizer for combined navigation processor

A combined navigation and synchronous pulse technology, applied in pulse processing, pulse technology, navigation through speed/acceleration measurement, etc., can solve problems such as different data update rates, crystal oscillator drift, and IMU acquisition time drift, and achieve good synthesis results. , Simple operation, simple and compact structure

Active Publication Date: 2009-12-02
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

2) The crystal oscillator inside the IMU will also drift with the change of temperature
3) The data update rate of the two is different
This will appear within two adjacent 1PPS, and the IMU acquisition time will drift

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  • Synchronizing pulse synthesizing method and synchronizing pulse synthesizer for combined navigation processor
  • Synchronizing pulse synthesizing method and synchronizing pulse synthesizer for combined navigation processor
  • Synchronizing pulse synthesizing method and synchronizing pulse synthesizer for combined navigation processor

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.

[0028] The field requires that the i-th frame data of the GPS receiver is at the same time as the 20j-th frame data of the IMU. For the above assumptions, it is required that the rising edge of the 200jth (j: a positive integer starting from 0) acquisition trigger pulse be aligned with the rising edge of 1PPS. Compared with the generalized time synchronization of multiple systems, the present invention has the biggest difference in that the output pulse frequency is different. The technical field faced by the present invention requires that the output is the IMU acquisition trigger pulse, which is frequency information, generally in the range of 20 Hz to 1 KHz. In order to realize this requirement, it is necessary to simultaneously solve the phase tracking and frequency tracking problems of the integrated navigation processor acquisition...

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Abstract

The invention provides a synchronizing pulse synthesizing method and a synchronizing pulse synthesizer for a combined navigation processor. The method comprises the following steps of: (1) generating a square wave in any frequency as an acquisition trigger pulse of the combined navigation processor by a local crystal oscillator and a frequency divider; (2) within each complete second cycle, continuously utilizing two adjacent 1PPS pulses outputted by a GPS satellite receiver to measure an actual frequency of the local crystal oscillator, obtaining a frequency dividing ratio of the acquisition trigger pulse frequency generated by the actual frequency of the local crystal oscillator, changing the frequency dividing ratio of the frequency divider, and realizing the accurate frequency division; and (3) by detection, comparing the time difference between the rising edge of the zero acquisition trigger pulse and the rising edge of the 1PPS pulse, and correcting the phase of the frequency divider. The synchronizing pulse synthesizer comprises the local crystal oscillator, the frequency divider based on the DDS theory, a frequency measuring unit, a fixed point divider and a phase correcting unit. The synchronizing pulse synthesizer has the advantages of simple and compact structure, low cost, wide application range, easy operation, good effect and the like.

Description

technical field [0001] The invention mainly relates to the field of combined navigation equipment, in particular to a synchronous pulse synthesis method and a synchronous pulse synthesizer for a combined navigation processor. Background technique [0002] The inertial navigation system can provide high-speed, high-precision full navigation information (including position, velocity, attitude, angular rate, acceleration, etc.), but the error of the pure inertial navigation system will accumulate over time, so the integrated navigation often uses inertial navigation The system is the main navigation equipment, and the integrated navigation system based on the inertial navigation system uses various information fusion methods to combine other navigation equipment to reduce the shortcomings of various independent navigation equipment, suppress the error of the inertial navigation system, and further improve the system. comprehensive performance. [0003] Taking SDINS (Strapdown ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K5/00H03L7/00G01R23/02H03K21/00G01C21/16G01S1/02G01S5/02
Inventor 罗兵胡小平吴美平江明明练军想潘献飞
Owner NAT UNIV OF DEFENSE TECH
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