Method for improving shore-ship time comparison precision
A technology of time comparison and two-way time comparison, which is applied in the field of information processing, can solve the problems of the distance change between the satellite and the comparison station, which affects the accuracy of time comparison, and achieve the effect of solving the error mathematical model correction problem
Active Publication Date: 2020-04-24
PLA NO 63686 CORPS
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Satellite two-way time comparison has the advantages of good real-time data output and high time comparison accuracy. At present, between international and domestic static time laboratories, satellite two-way time comparison method has obtained better than 0.3ns. Time comparison accuracy, but when the station participating in the comparison moves relative to the satellite, the distance between the satellite and the comparison station will change, seriously affecting the time comparison accuracy
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[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0037] A method for improving the time comparison accuracy of shore ships in this embodiment, which proposes a satellite-based two-way time comparison method to improve the time accuracy of the sea-based measurement and control platform, and establishes a satellite two-way time comparison suitable for the motion characteristics of the sea-based measurement and control platform Error correction model, and time difference correction by difference method, to achieve shore-to-ship time comparison accuracy better than 10ns.
[0038] Described method realizes concrete steps as follows:
[0039] Step 1. Establish a satellite two-way time comparison system
[0040] The shore ship time comparison system consists of a sea-based platform and a fixed station, wherein the fixed station is a Beidou satellite ground station, which is composed of an atomic c...
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The invention relates to a method for improving the shore-ship time comparison precision. According to the method, a shore-ship satellite bidirectional time comparison system is established at first.The method comprises the following steps: 1, the shore-ship satellite bidirectional time comparison system is built, a channel part of a sea-based satellite communication system is fully utilized, andequipment transformation engineering is reduced; 2, by researching a fixed station satellite bidirectional time comparison error and a correction model, a mathematical model for satellite bidirectional time comparison of an offshore motion platform is established, and errors caused by the motion platform are effectively corrected; and 3, a method for estimating a current time difference variationbased on historical time difference data is provided, so that a comparison error caused by heaving of the motion platform is effectively solved. According to the method, the shore-ship time comparison precision of the offshore sea-based measurement and control platform is greatly improved, the innovativeness, the advancement and the practicability are very high, and a technical basis is providedfor expanding the capability of the sea-based measurement and control platform for executing diversified tasks.
Description
technical field [0001] The invention relates to a method for improving the accuracy of shore-to-ship time comparison. It belongs to the field of information processing technology. Background technique [0002] For a sea-based measurement and control platform in a state of continuous motion, the measurement accuracy of its own space coordinates and attitude is an important factor restricting its improvement of the comprehensive measurement accuracy of the target, and the measurement accuracy of space coordinates is closely related to the time measurement accuracy. For multi-target measurement tasks, it is difficult to distinguish the relative motion state between targets only relying on the data of a single-station sea-based measurement and control platform, and the continuous motion of the sea-based measurement and control platform will further affect the measurement accuracy of the relative motion state of multiple targets. Improving the measurement accuracy of the sea-bas...
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IPC IPC(8): G01S19/25
CPCG01S19/256Y02A10/40
Inventor 梁盛藤晓云毛南平潘高峰李金辉孙晓东张铮曾蓝辉
Owner PLA NO 63686 CORPS