CN108398126A - A kind of high-precision air-sea gravity measurement platform inclination correction model - Google Patents
A kind of high-precision air-sea gravity measurement platform inclination correction model Download PDFInfo
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- CN108398126A CN108398126A CN201810053373.3A CN201810053373A CN108398126A CN 108398126 A CN108398126 A CN 108398126A CN 201810053373 A CN201810053373 A CN 201810053373A CN 108398126 A CN108398126 A CN 108398126A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/10—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration
- G01C21/12—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration executed aboard the object being navigated; Dead reckoning
Abstract
The present invention relates to a kind of high-precision air-sea gravity measurement platform inclination correction model, technical characteristics are：Two horizontal component factors of models coupling earth disturbing gravity and Coriolis acceleration generate, and indicate as follows：δaH=[fx 2+fy 2‑(ae+Ce‑δge)2‑(an+Cn‑δgn)2]/(2gm), in formula, δ aHRepresent platform inclination correction of gravity number；fx、fyThe horizontal acceleration that respectively platform x-axis and y-axis sensitivity arrive；δgeWith δ gnRespectively represent the east component and north component of disturbing gravity acceleration；aeAnd anRespectively represent the motion carrier e axis horizontal acceleration derived from high accuracy positioning information and n axis horizontal accelerations；CeAnd CnRespectively represent the east component and north component of Coriolis acceleration；gmFor gravimeter observation.The present invention has been effectively combined two horizontal components of earth disturbing gravity and Coriolis acceleration, improves the accuracy of measurement, and provide necessary theory support to improve air-sea gravity measurement operation or work standard and data processing model.
Description
Technical field
The invention belongs to marine gravity technical field, especially a kind of high-precision air-sea gravity measurement platform inclination corrects mould
Type.
Background technology
Sea boat-carrying and airborne gravity measurement are to obtain two kinds of main means of marine site gravity field information.Air-sea gravimeter is
The Core equipment of two kinds of measurement patterns, air-sea gravity measurement quality of achievement in addition to can by measure dynamic environment effect interference and
Outside the influence of data processing modeling error, the quality of air-sea gravimeter self-technique performance is also to influence the master of the observation quality of data
Want one of factor.With the progress of modern science and technology, nearest more than 20 years, air-sea gravity measurement especially airborne gravity measurement skill
Art achieves major progress, and airborne gravity measurement precision is increased to from original ± 10mGal (mGal=10-5m/s2) ±
Level even higher (2~3) mGal.Airborne gravity measurement technology can obtain so swift and violent development and mainly have benefited from three
The technological break-through of aspect, first, difference GNSS measures the realization of carrier positions, speed and acceleration technology；Second is that novel gravity is surveyed
The development of quantity sensor；Third, the structure of the accurate model of air-sea gravity survey data processing.The latter relates generally to and measures dynamic
Every correction of environmental correclation, horizontal acceleration correction is one of most important one correction member.For using gyrocontrol
The gravity measuring system of platform, due to being influenced by marine and aerial work environment and platform self-technique performance restricts, visitor
Gyro-stabilized platform is set to remain that abswolute level is nearly impossible on seeing, therefore, gravity sensor observational record is not
It can avoid being interfered by horizontal acceleration, it is necessary to carry out necessary compensation and amendment to it.But result of study shows to make at present
Computation model is all the approximate formula under definite meaning, water caused by carrier movement under the conditions of just thinking of to platform inclination
Flat acceleration noise, and the influence of two horizontal components of earth disturbing gravity and Coriolis acceleration is had ignored, it is this to ignore
Do not allow in high-precision airborne gravity measurement operation.
Invention content
It is an object of the invention to overcome the deficiencies in the prior art, propose a kind of high-precision air-sea gravity measurement platform inclination
Correction model solves existing air-sea gravity measurement platform inclination correction model and is asked since precision caused by approximate sex chromosome mosaicism is low
Topic.
The present invention solves its technical problem and following technical scheme is taken to realize：
A kind of high-precision air-sea gravity measurement platform inclination correction model, the models coupling earth disturbing gravity and Ke Li
Two horizontal component factors of profit acceleration difficult to understand generate, and indicate as follows：
In formula, δ aHRepresent platform inclination correction of gravity number；fx、fyThe horizontal acceleration that respectively platform x-axis and y-axis sensitivity arrive
Degree；δgeWith δ gnRespectively represent the east component and north component of disturbing gravity acceleration；aeAnd anIt respectively represents by high-precision fixed
Motion carrier e axis horizontal acceleration and n axis horizontal accelerations derived from the information of position；CeAnd CnRespectively represent Coriolis acceleration
East component and north component；gmFor gravimeter observation.
The advantages and positive effects of the present invention are：
Reasonable design of the present invention is asked for approximation existing for existing air-sea gravity measurement platform inclination correction model
Topic is proposed and takes the platform inclination correction amendment mould that two horizontal components of earth disturbing gravity and Coriolis acceleration influence into account
Type, and by the actual observation data verification validity of correction model, the accuracy of measurement is improved, and to improve air-sea weight
Power measures operation or work standard and data processing model provides necessary theory support.
Specific implementation mode
The present invention is further described by the following examples.
The present invention design philosophy be：Platform inclination is influenced caused by gravimetric observation in terms of being mainly reflected in two, and one
Aspect is since platform inclination makes all kinds of horizontal accelerations produce additional effect in the vertical sensitive axes of gravity sensor；
On the other hand be due to platform inclination make gravity sensor sensitivity to be not acceleration on real gravimetric plumb line direction.By
This learns, as long as platform inclination occurs, is interfered even if there be no horizontal acceleration, it is also necessary to carry out platform inclination correction of gravity.
Current numerous domestic and international open source informations nearly all unanimously accelerate horizontal disturbance when deriving and using platform inclination correction model
Degree is reduced to single motion carrier horizontal acceleration.And in fact, in the horizontal direction other than motion carrier acceleration, it goes back
There are earth disturbing gravity and the Coriolis acceleration components caused by carrier movement.
Based on above description, the present invention designs obtain with the following method：
According to invariable rotary formula scalar gravity measurement principle, dynamic gravity measurement fundamental equation is obtained：
In formula,For gravity acceleration；Represent the vector sum of Coriolis acceleration and carrier movement acceleration；
For gravity sensor (accelerometer) measurement vector.It can further be obtained by formula (2)
In formula, fx、fyAnd fzThe horizontal acceleration that respectively three axis of orientation sensitivities of platform arrive, G represent all kinds of vertical acceleration
The algebraical sum of degree；δgeWith δ gnRespectively represent the east orientation and north component of disturbing gravity acceleration；qeAnd qnIt is expressed as
qe=ae+Ce (4)
qn=an+Cn (5)
In formula, CeAnd CnRespectively represent the east orientation and north component of Coriolis acceleration；Combinatorial formula (1) is to formula
(5), it finally obtains and takes the slope correction amendment mould that two horizontal components of earth disturbing gravity and Coriolis acceleration influence into account
Type is as follows：
In formula, δ aHRepresent platform inclination correction of gravity number；gmFor gravimeter observation.
The platform inclination correction of gravity model of the present invention and the difference of traditional formula are mainly shown as that the former increases than the latter
The influences of two horizontal components of earth disturbing gravity and Coriolis acceleration.It formally sees, is exactly in correction formula (6)
It is middle to use (ae+Ce-δge) and (an+Cn-δgn) substitute traditional formula in aeAnd an.According to field data, a northwest is chosen respectively
To the southeast to the opposite southeast of survey line and another direction to north-westward repeat sequence, Coriolis and earth disturbance are calculated successively
The size of two horizontal components of acceleration of gravity, and slope correction number and its mutual deviation corresponding to conventional model and correction model
Value.Specific statistical result is as shown in table 1.
1 Coriolis of table and disturbance gravitational acceleration and slope correction comparison of computational results/mGal
Found out by 1 result of calculation of table, the influence that Coriolis and earth disturbing gravity acceleration correct platform inclination is most
Big reachable several milligals (mGal), conventional model and the mutual deviation root-mean-square value of correction model result of calculation are more than 1mGal.Obviously,
Such ocean and airborne gravity measurement operation for influencing magnitude for modern high-precision requirement, all can not ignore.Therefore,
It should be used uniformly correction model provided herein in practical applications and carry out platform inclination correction of gravity calculating.
Table 2 uses the mutual comparison result/mGal of repeat sequence before and after slope correction correction model
| Model | Lowest difference | It is maximum poor | Mean difference | Standard deviation | Middle error |
| Tradition | -4.34 | 6.20 | 4.28 | 1.95 | 4.70 |
| It corrects | -4.19 | 5.97 | 4.17 | 1.73 | 4.52 |
Table 2 gives the comparison feelings using above-mentioned repeat sequence result of calculation accordance before and after slope correction correction model
Condition, the result equally illustrate that it is necessary and effective to substitute conventional model implementing platform slope correction using correction model.
It is emphasized that embodiment of the present invention is illustrative, without being restrictive, therefore packet of the present invention
Include the embodiment being not limited to described in specific implementation mode, it is every by those skilled in the art according to the technique and scheme of the present invention
The other embodiment obtained, also belongs to the scope of protection of the invention.
Claims (1)
1. a kind of high-precision air-sea gravity measurement platform inclination correction model, it is characterised in that：Models coupling earth disturbance
Two horizontal component factors of gravity and Coriolis acceleration generate, and indicate as follows：
In formula, δ aHRepresent platform inclination correction of gravity number；fx、fyThe horizontal acceleration that respectively platform x-axis and y-axis sensitivity arrive；δ
geWith δ gnRespectively represent the east component and north component of disturbing gravity acceleration；aeAnd anIt respectively represents and is believed by high accuracy positioning
The derived motion carrier e axis horizontal acceleration of breath and n axis horizontal accelerations；CeAnd CnRespectively represent the east of Coriolis acceleration
To component and north component；gmFor gravimeter observation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111913229A (en) * | 2020-08-03 | 2020-11-10 | 中国自然资源航空物探遥感中心 | Sea-air gravity network cross point searching method and device |
| CN112965123A (en) * | 2021-02-08 | 2021-06-15 | 中国人民解放军92859部队 | Method for calculating north component of external disturbance gravity based on gravity anomaly |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111913229A (en) * | 2020-08-03 | 2020-11-10 | 中国自然资源航空物探遥感中心 | Sea-air gravity network cross point searching method and device |
| CN111913229B (en) * | 2020-08-03 | 2023-03-24 | 中国自然资源航空物探遥感中心 | Sea-air gravity network cross point searching method and device |
| CN112965123A (en) * | 2021-02-08 | 2021-06-15 | 中国人民解放军92859部队 | Method for calculating north component of external disturbance gravity based on gravity anomaly |
| CN112965123B (en) * | 2021-02-08 | 2022-04-19 | 中国人民解放军92859部队 | Method for calculating north component of external disturbance gravity based on gravity anomaly |
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Application publication date: 20180814 |