METHOD OF DETERMINING DISTANCE TO EARTH SURFACE Russian patent published in 2017 - IPC G01S13/32 

FIELD: measuring equipment.

SUBSTANCE: method for determining the distance to the earth surface consists of emitting probing signals in the direction of the earth surface, using radio pulses having a carrier frequency ƒ_n as probing signals, duration t_i, repetition period T_r, consisting of N monochromatic subpulses of duration τ with non-periodic phase-code internal pulse manipulation, which is performed by modulating M-sequences of initial phases of subpulses that take one of two values 0 or π, reception of signals reflected from the earth surface, matched filtering of the reflected signals, using codes, forming the modulating M-sequences, as a weight coefficient and determining the range to the earth surface. Retuning of the carrier frequency ƒ_n of radio pulses is done from the radio pulse to the radio pulse by a random equally possible law in each repetition period and the radio pulse repetition period, radio pulse duration and number of monochromatic subpulses are changed from the radio pulse to the radio pulse.

EFFECT: improvement of the operation security in determining the distance to the earth surface.

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