METHOD FOR SIMULATION OF SIGNAL REFLECTED FROM GROUND SURFACE IN REAL BEAM MAPPING MODE Russian patent published in 2014 - IPC G01S7/52 

FIELD: radio engineering, communication.

SUBSTANCE: in the proposed method there set are location coordinates and movement parameters of a carrier of a receiving-transmitting radio-technical system, considering an antenna directivity pattern (DP); boundaries of an area of radio emission interaction with a section of an underlying surface presented with a set of resolution elements are determined; an image of ground surface are pre-shaped in gradations of gray colour at intervals corresponding to image change frequency determined by a mapping mode, as well as signals determining navigation parameters and control signals shaped by the specified mapping mode, including antenna DP width as to azimuth and angle of a place, number of (strobes) of range channels, position of an antenna beam as to azimuth and angle of the place, duration of a sounding pulse, period of its repetition and type of modulation; depending on the obtained parameters, separation of the ground surface image is performed for each beam position into resolution elements as to range, which are characterised by a value of reflected signal amplitude determined based on averaged colour of the original image area corresponding to this resolution element; modulation of a pre-shaped harmonic signal is performed by amplitude of reflected signal from each resolution element; its phase modulation is performed with thirteen-digit Barker code, and based on the received signal, shaping of its in-phase and quadrature-phase components and its conversion to intermediate frequency and digital-to-analogue conversion is performed; then, sequence of actions is repeated for each beam position within a zone of vision.

EFFECT: improving accuracy and reducing time for simulation of a signal reflected from ground surface.

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