GNSS receiver dynamic precision calibration method based on photoelectric sensor

Abstract

The invention belongs to the technical field of GNSS terminal testing, and discloses a GNSS receiver dynamic measurement precision calibration method based on a photoelectric sensor. A high-precisiontrigger time recording circuit is used, the precise time of the pulse edge generated when the antenna touches the light of the photoelectric butt sensor when the GNSS receiver to be measured moves within a certain area of space is recorded, the instantaneous "true value" when the antenna passes through a certain measurement position is calculated by the precise time and the reference point coordinates, the measurement value of a certain point of space passed by the GNSS receiver is compared with the "true value" of the point and thus the dynamic measurement precision of the receiver can be obtained. The common errors and disputes which are difficult to eliminate in case of using satellite position can be avoided, the precise time record when the receiver antenna reaches the touch positioncan be ensured, and a foundation can be laid for calculating the coordinate true value of the receiver measurement moment. Besides, the extendibility is high and corresponding upgrading can be performed according to different dynamic requirements.

Description

technical field [0001] The invention belongs to the technical field of GNSS terminal testing, and is especially suitable for testing and evaluating the dynamic measurement accuracy of various vehicle-mounted and airborne GNSS high-precision measurement systems. Background technique [0002] In recent years, with the continuous construction and improvement of my country's Beidou global satellite navigation system, measurement receivers have become more and more widely used in the navigation industry. The positioning and speed measurement accuracy under dynamic conditions is an important assessment index. At present, the single-point positioning accuracy of GNSS receivers is meter-level, and the measurement accuracy of GNSS receivers after carrier phase difference can reach centimeter-level (the nominal accuracy is up to 10mm+1ppm), how to measure its measurement accuracy, especially under dynamic conditions Accuracy testing and evaluation is a technical problem in the field ...

AI Technical Summary

Problems solved by technology

The key to this method is that the reference equipment obtains the attitude information. At present, the photography method or the total station method are mainly used, and the comparison equipment needs to be specially developed, and the requirements for the optical communication of the site, the dynamic performance of the attitude measurement equipment, and the time synchronization are relatively high, and The implementation of the project is difficult and difficult to promote

[0006] The third is the commonly used test method is the outdoor "sports car" comparison method, which uses a high-precision receiver as the "true value" for dynamic comparison of sports cars. It is a satellite navigation system, and the errors included are strongly correlated. The result of the comparison can only be the relative accuracy between devices, and it is difficult to accurately give the absolute accuracy of the receiver under motion conditions.

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