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There are various different kinds of on-board satellite data (called 'satellite integrated data'), such as telemetry, telecommand, diagnosis knowledge, etc. Because some of the data (such as telemetry) is very large and most of these data is needed to be inquired in near real time, a stronger management strategy is needed to deal with the data. This paper researched the key techniques about satellite...
Fractional vegetation cover (FVC) is one of the most critical indicators for herbaceous wetland vegetation status, degradation and desertification process simulations. The dense in time series and high spatial resolution of FVC is required for wetland ecosystem monitoring because of its heterogeneous landscapes and rapid spatio-temporal variations. However, due to the tradeoff in satellite sensor...
How to accurately detect cloud and snow in the remote sensing imagery is an open problem for the remote sensing application. For only visible and near infrared band in HJ-1A/B CCD images, the cloud detection algorithm using the shortwave infrared and thermal infrared band is restricted by the band-lacking problem. Based on the multi-temporal information of the HJ-1A/B CCD images, a new algorithm is...
In this paper, we first present a classification for existing GPS positioning algorithms based on their features of mathematical operations in the calculating process and the accuracy of the solutions solved. Then we systematically evaluate and compare the performance of GPS algorithms for practical environments. Performance metrics include normalized execution time and the absolute error. We examine...
In this paper, we propose and analyze a new GPS positioning algorithm. Our algorithm uses the direct linearization technique to reduce the computation time overhead. We invoke the general least squares method in order to achieve optimality in the situation when the trilateration system of equations becomes over-determined. We systematically evaluate our new algorithms and show that they indeed take...
In this paper, a general problem about the attitude dynamics and control of asymmetric satellites is discussed. Due to the asymmetric structure, the properties of such satellites are different from symmetric ones. Perturbation moments accumulate with time, and the attitude angles increase periodically with time. Furthermore, chaos could be happened. Traditional linear controller can not compensate...
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