Investigating the Variability of Earth Gravity Field’s J2 Spherical Harmonic Coefficient Using Satellite Laser Ranging Data

2009 ◽  
Author(s):  
M. C. Botai ◽  
W. L. Combrinck
Keyword(s):  
Spherical Harmonic ◽  
Harmonic Coefficient ◽  
Satellite Laser Ranging ◽  
Laser Ranging ◽  
Spherical Harmonic Coefficient ◽  
Earth Gravity

scholarly journals Analysis of Deflection of Vertical Compensation for Inertial Navigation System

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Shiwen Hao ◽  
Zhili Zhang ◽  
Zhaofa Zhou ◽  
Junyang Zhao ◽  
Zhenjun Chang ◽  
...  
Keyword(s):  
High Precision ◽  
Spherical Harmonic ◽  
Inertial Navigation System ◽  
Inertial Navigation ◽  
Harmonic Coefficient ◽  
Calculation Error ◽  
Harmonic Model ◽  
Spherical Harmonic Coefficient ◽  
Deflection Of Vertical ◽  
Spherical Harmonic Model

With the development of high-precision inertial navigation systems, the deflection of vertical (DOV), gravity disturbance, is still one of the main error sources that restrict navigation accuracy. For the DOV compensation of the Strapdown Inertial Navigation System (SINS) problem, the influences of the calculation degree of the spherical harmonic coefficient and the calculation error of the DOV on the compensation effect were studied. Based on the SINS error model, the error propagation characteristics of the DOV in SINS were analyzed. In addition, the high-precision global gravity field spherical harmonic model EIGEN-6C4 was established and the influence comparative analysis of the calculation degree of the spherical harmonic coefficient on the DOV compensation of SINS in different regions was carried out. Besides, the influence of the calculation error of the DOV on the compensation was emphatically analyzed. Finally, the vehicle experiment verified the feasibility of compensation in SINS based on the gravity field spherical harmonic model. The simulation and experiment results show that it is necessary to consider the influence of the calculation degree and the calculation error of the DOV on the compensation for long-time high-precision SINS with the position accuracy of 0.3 nm/h, while the SINS with general requirements for position accuracy can ignore the impact.

scholarly journals CONSTRAINT ON INTERMEDIATE-RANGE GRAVITY FROM EARTH–SATELLITE AND LUNAR ORBITER MEASUREMENTS, AND LUNAR LASER RANGING

2005 ◽  
Vol 14 (10) ◽  
pp. 1657-1666 ◽  
Author(s):  
GUANGYU LI ◽  
HAIBIN ZHAO
Keyword(s):  
Experimental Tests ◽  
Earth Satellite ◽  
Laser Ranging ◽  
Satellite Measurement ◽  
Lunar Orbiter ◽  
Lunar Laser Ranging ◽  
Intermediate Range ◽  
Earth Gravity ◽  
Lunar Laser ◽  
Order Of Magnitude

In the experimental tests of gravity, there have been considerable interests in the possibility of intermediate-range gravity. In this paper, we use the earth–satellite measurement of earth gravity, the lunar orbiter measurement of lunar gravity, and lunar laser ranging measurement to constrain the intermediate-range gravity from λ = 1.2 × 107 m –3.8 × 108 m . The limits for this range are α = 10-8–5 × 10-8, which improve previous limits by about one order of magnitude in the range λ = 1.2 × 107 m –3.8 × 108 m .

scholarly journals Satellite laser ranging measurements in South Africa: Contributions to earth system sciences

2015 ◽  
Vol 111 (3/4) ◽  
pp. 1-9 ◽  
Author(s):  
Christina M. Botai ◽  
Ludwig Combrinck ◽  
Joel O. Botai
Keyword(s):  
South Africa ◽  
Satellite Laser Ranging ◽  
Laser Ranging ◽  
Earth System

NRL@SOR: satellite laser ranging with robust links

1997 ◽  
Author(s):  
G. Charmaine Gilbreath ◽  
Mark A. Davis ◽  
Peter Rolsma ◽  
Timothy J. Meehan ◽  
Richard Eichinger ◽  
...  
Keyword(s):  
Satellite Laser Ranging ◽  
Laser Ranging
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