METHOD OF DETERMINATION AND PREDICTION OF SUBJECTED TO ATMOSPHERIC BRAKING AIRCRAFT MOTION ON LOW ORBITS Russian patent published in 2012 - IPC B64G3/00 

FIELD: transport.

SUBSTANCE: invention relates to technique of determination and prediction of aircraft braking on low orbits due to variations of upper-atmosphere density. Method of determination and prediction of aircraft motion consists in the following: spacecraft trajectory parameters are measured on metering interval and recorded into reference measurements array on specified metering interval. Adaptive refinement of ballistic coefficient average value of normalised mean-square deviation (k_atm) and correlation interval of its variations (Δ) is performed, when data is insufficient for adaptation corresponding a priory braking characteristics are used. Array of a priory data includes number of measurements on metering interval, values of mean square errors of measurement vector components, array of average values of solar and geomagnetic activity indices, as well as array of user specified prediction intervals. Statistical characteristics of motion on metering interval prediction errors calculation and weight matrix calculation according to maximum likelihood P_k method is performed. Satellite state vector for time of the last measurement without regard to atmospheric deceleration is calculated. Based on residual misties between measured and calculated orbit parameters, current and predicted values of ballistic coefficient evaluations are calculated based on residual misties and based on correlation of its variation. Aircraft motion is predicted based on addressing to standard modules of motion equations integration and statistical errors calculation for motion prediction.

EFFECT: higher accuracy of determination and prediction of subjected to atmospheric braking aircraft orbits.

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