Compressed polynomial approach for onboard ephemeris representation

Sheela, B. V.; Padmanabhan, P.

doi:10.2514/3.25401

Cited by 5 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The onboard orbit software then unfolds the polynomial expression as function of onboard time. 3 Here appropriate correlation between the onboard and ground time is known.…”

Section: Efficient Onboard Algorithmmentioning

confidence: 99%

“…This orbit is referred to as actual orbit. The onboard orbit is an unfolding polynomial representation of the actual orbit, 3 within a desired accuracy. About 20 coefficients are uplinked to make the orbit available onboard and it is valid for two days’ duration and accurate within 40 m. As the orbiting satellite is always visible, this implementation is not a problem.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Efficient onboard image motion compensation for orbital inclination and eccentricity of geostationary weather satellites

Ramachandran

Agarwal

Daniel

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

Image registration is important in geostationary weather satellites. Achieving consistent registration of the images with respect to the geographical locations on the Earth is here of interest. The consistency in the registration between the images is affected whenever the orbital inclination and eccentricity are not zero. The imaging payload has a two-axis scanning mirror to capture the Earth image. The above orbital effects together with scan mirror pointing direction are the factors that cause the misregistration. This paper presents an onboard algorithm that provides the scan compensation angles due to the above factors and achieves consistent registration. The compensation varies every second, which is the time taken for each scan. Hence it is preferred to have computations onboard than to have ground based bulk uplinks for the scan compensation. The paper presents an algorithm that is useful, say, when (i) the onboard computing capabilities are limited, (ii) the navigation accuracies are coarse and (iii) the image resampling is not preferred on the ground and the payload data are directly used for weather applications. The paper also discusses the tests that were carried on the onboard software in order to validate its performance in achieving the consistent registration before launch. This is done by using another independent software tool which is also described in detail. Image motion algorithm was invoked for a couple of days in INSAT 3DR. The atmospheric wind vector deduced directly from the satellite images is given at the end.

show abstract

“…The onboard orbit software then unfolds the polynomial expression as function of onboard time. 3 Here appropriate correlation between the onboard and ground time is known.…”

Section: Efficient Onboard Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%