METHOD FOR LOCATING SATELLITE COMMUNICATION EARTH STATION Russian patent published in 2012 - IPC G01S5/00 

FIELD: satellite control systems.

SUBSTANCE: satellite control system antenna is pointed on the satellite retranslating the signal of this earth station. Measuring receiver is connected to the antenna-feeder tract of the SCS station and is used to measure mean square value of retranslated signal power from simultaneously operating through retranslating satellite reference earth stations with known earth coordinates and target ES. The measurements are performed in discrete moments of time on fixed frequency of retranslated signals of ES on the observation interval T_H. The results of measurements are recorded in text files and are presented in form of curves (fig.1) where on the horizontal axis there are counting numbers n=0,1,2….,N - numbering of counting with spacing Δ_t with Δ_t=const, Δ_t -interval between counting, and on the vertical axis there are values of counting equal to signal levels y_q(n), q=1,2,…, q- numbering of earth stations. Using visual analysis of the dependences long-term cyclic repetition of signal level fall with short-living high frequency components. Fall of signal level is associated with its weakening when the ES- retranslating satellite is passing through the areas of volumetrically distributed hydrometeors (VDH). With such repetitions on the observation interval T_H the detailed information is determined on dynamic properties of signals - parameters of reviewed repetitions (beginning, duration, ending). In order to get it the procedure of processing of discrete sequences of signal counting y_q(n) is performed using the software means of discrete wavelength transformer on the base of basic Dobeshi wavelength of the 1^st order on PC in MathLab program. Discrete sequences of signal counting y_q(n) are decomposed into refining wavelength-coefficients 1_d,n where d=1,2,…, D - numbering of decomposition level of different scope of signal dynamic with D≤log₂N. Refining wavelength-coefficients 1_d,n are presented in form of curves (fig.2) where on the horizontal axis are number of counting n, and on the vertical counting - values of refining wavelength-rations 1_d,n that show on selected decomposition level d in different scope dynamic properties of the signal - parameters of cyclic repetition of signal level falls (beginning, duration, amount). Using visual analysis of the curves the similarity of such parameters is detected between target ES and at least one reference ES. Based on the geometric presentation of the method (fig.3) showing local homogenous area of VDH, central prospective projection of such area on the Earth surface and routes ES-retranslating satellite, it is thought that the similarity is caused by routes ES-retranslating satellite passing through the same VDH area with limited occupying space and condition of passing of different routes ES-retranslating satellite through VDH area with such characteristics is territorial proximity of ES. The area of most probable location of target ES is determined by referencing the earth coordinates of reference ES that is similar to target ES in dynamics of retranslated signals levels.

EFFECT: simplification and decreased realization cost of the method achieved due to locating earth station (ES) in the abovementioned way.

1 dwg, 3 dwg