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Method for evaluating confidence of measuring parameters of strap-down air-borne gravimeter

A technology for aviation gravity and measurement parameters, applied in the direction of measuring devices, instruments, etc., can solve the problems of difficulty in evaluating the accuracy of measurement parameters and many error factors

Active Publication Date: 2012-06-13
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0003] For the platform-type aviation gravity system, the evaluation of measurement parameters is generally completed by comparing the upward extension of the ground gravity reference point, while the strapdown inertial navigation system is directly connected to the aircraft, and there are many error factors. The accuracy evaluation of measurement parameters tougher

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  • Method for evaluating confidence of measuring parameters of strap-down air-borne gravimeter

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[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] The space gravitational field is a very complex field, which originates from the gravitational force, and any mass object can change it, so there are many factors that affect it, such as the sun, the moon, underground mines, and surface buildings. The gravitational field at any point in space changes in time. Fortunately, those high-frequency components of the gravity field have a small amplitude, which allows us to obtain relatively stable low-frequency components with a certain accuracy, and use them to represent the gravity value at this point in space. However, the evaluation of gravity anomalies in airborne gravimetry is still difficult, and the key reason is that the true value of gravity in space is unknown. The present invention is all about accurate evaluation of measured values ​​when the true value is unknown.

[0...

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Abstract

A method for evaluating confidence of measuring parameters of a strap-down air-borne gravimeter includes: (1) evaluating accuracy and stability of a sensor of the strap-down air-borne gravimeter; (2) evaluating initial alignment accuracy of the strap-down air-borne gravimeter; (3) evaluating integrated navigation accuracy of the strap-down air-borne gravimeter; (4) evaluating carrier acceleration calculating accuracy; and (5) integrating evaluation parameters by reflecting confidence of a measuring data source through the accuracy and the stability of the sensor, reflecting confidence of data acquisition and calculation in measuring process through performance parameters in the measuring process, accordingly calculating final measuring results, namely, calculating confidence indexes of gravity anomalies, respectively calculating confidence of an acceleration meter, a gyroscope, initial alignment, integrated navigation and carrier acceleration calculating accuracy, and finally distributing corresponding weight of the calculated confidence to evaluate the confidence of the sensor of the strap-down air-borne gravimeter. The method has the advantages of simple principle, fine operability, high practicability, easiness in popularization and the like.

Description

technical field [0001] The present invention mainly relates to the field of aviation gravity measurement equipment, in particular to a measurement parameter confidence evaluation method suitable for a strapdown airborne gravity meter (Strapdown Airborne Gravity System, SAGS). Background technique [0002] Aeronautical gravity measurement has always been an international research hotspot. At present, the aviation scalar measurement system based on platform inertial navigation has been used in commercial flights, and the aviation gravity system based on strapdown inertial navigation is still under development. The methods for evaluating the confidence of airborne gravimetry parameters are not documented in the literature. [0003] For the platform-type aviation gravity system, the evaluation of measurement parameters is generally completed by comparing the upward extension of the ground gravity reference point, while the strapdown inertial navigation system is directly connect...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00
Inventor 吴美平黄杨明张开东蔡劭琨曹聚亮潘献飞练军想
Owner NAT UNIV OF DEFENSE TECH
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