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A Smooth Elimination Method for Constellation Hopping Errors in Aeronautical Gravimetry

An aviation gravity and jump technology, applied in the direction of measuring devices, gravitational field measurement, geophysical measurement, etc., can solve the problems of constellation jump error correction ineffective, lack of theoretical weighting matrix design, loss of lock, etc., to achieve automatic procedures Easy, high degree of automation, and the effect of eliminating jump errors

Active Publication Date: 2016-01-20
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The disadvantage of this method is that the design of the weighting matrix lacks theory, and it can only reduce the influence of the hopping error to a certain extent but cannot be completely eliminated, and it has no effect on the correction of the constellation hopping error caused by non-low elevation angles, such as receiving The aircraft loses lock to high-elevation satellites due to reasons such as being blocked, etc.

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  • A Smooth Elimination Method for Constellation Hopping Errors in Aeronautical Gravimetry
  • A Smooth Elimination Method for Constellation Hopping Errors in Aeronautical Gravimetry
  • A Smooth Elimination Method for Constellation Hopping Errors in Aeronautical Gravimetry

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] The solution of carrier acceleration in airborne gravimetric measurement is generally processed afterwards. Firstly, the position sequence of the carrier is solved, and the position sequence is numerically differentiated to obtain the velocity and acceleration values ​​of the carrier. Therefore, jumps in the sequence of positions introduce additional errors in the differencing process. In addition, since the obtained carrier acceleration contains a large amount of random measurement noise, it is necessary to suppress high-frequency noise through a low-pass filter and extract the gravity signal. The above-mentioned jump errors will also cause edge effects in the low-pass filter, and then have an impact on the obtained acceleration sequence.

[0034] When calculating the carrier acceleration, firstly, the position sequence of t...

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Abstract

The invention discloses a smooth constellation jump error elimination method in airborne gravity measurement. The method comprises the following steps of: classifying and marking moments when navigation constellation jump occurs on each measuring line, and performing error estimation and compensation according to the jump type; and performing smooth weighting compensation on the position of the calculation position of the epoch before and after the jump, so that the influence of constellation jump on calculation of the carrier position is eliminated so as to obtain a smooth position sequence. The method has the advantages that the principle is simple, the operation is simple and convenient, the jump error can be completely eliminated, and the calculation precision is improved.

Description

technical field [0001] The invention mainly relates to the technical field of airborne gravity measurement, in particular to a method for smoothing and eliminating constellation jump errors in airborne gravity measurement. Background technique [0002] Airborne gravity measurement is one of the important means to obtain near-earth information at present, and determining the state parameters such as the acceleration of the airborne carrier itself is the premise and key to realize the data processing of airborne gravity measurement. At present, the high-precision positioning capability of the satellite navigation system is widely used to measure the acceleration of the real carrier. Therefore, the measurement results are affected by various GNSS error sources, and the constellation jump error is an important error source that has a greater impact on the results. [0003] The length of the airborne gravity survey line can reach hundreds of kilometers. Due to elevation angle con...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V7/16G01S19/40
Inventor 李显吴美平张开东
Owner NAT UNIV OF DEFENSE TECH
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