METHOD FOR ESTIMATING LINEAR SPEED OF MOBILE OBJECT USING SINGLE-POSITION PASSIVE RADAR EQUIPMENT OUTSIDE ZONE OF DIRECT RADIO VISIBILITY Russian patent published in 2023 - IPC G01S11/10 G01S5/02 G01S5/06 

FIELD: radars.

SUBSTANCE: passive radar that can be used to evaluate the speed characteristics of mobile objects located outside the zone of direct radio visibility and transmitting signals from their on-board radio electronic equipment (REE) through a non-regenerative satellite relay located in geostationary orbit (GSO). The claimed method consists in placing a single-position ground or surface passive radar facility on the Earth's surface in the area of receiving signals from the "RS-GBUT" channel of a satellite data relay system (SDRS), which ensures transmission of signals from on-board radio electronics of mobile objects from the area of the air or space situation being controlled to the GBUT location area. The passive radar tool searches for signals in a given frequency range. When a signal is detected, it is received and processed, during which the central frequency of the spectrum is determined, considered as the carrier frequency of the signal. During non-regenerative relaying, the carrier frequency of the signal in the “SR-GBUT” channel differs from the signal frequency set by the transmitting equipment of the mobile object by a known fixed frequency transfer value established in the SDRS. When analysing the SR signal that provides communication between a mobile object and the GBUT, the passive radar device accumulates an array of values of the carrier frequency of the received signal, which is used to calculate, using numerical differentiation methods, an array of values for the carrier frequency rate of change (CFRoC) of the received signal. The calculated CFRoC values allow one to estimate the speed of a mobile object, since it is the main factor influencing the change in the increment of the carrier frequency of the signal during reception. To estimate the speed of a mobile object, several increments of the carrier frequency are analysed, obtained by processing the entire array of received frequency values.

EFFECT: ability to estimate the speed parameters of movement of mobile objects outside the line-of-sight zone using a single-position passive radar device through technical analysis of radio signals from a relay satellite (RS), which provides communication between mobile objects, and a ground-based user terminal (GBUT).

1 cl, 7 dwg