METHOD FOR DETERMINING THE POSITION OF A SURVEILLANCE RADAR STATION WITH A PASSIVE DIRECTION FINDER Russian patent published in 2021 - IPC G01S5/06 G01S13/48 G01S13/87 

FIELD: radar ranging.

SUBSTANCE: invention is intended for determination of position of operating radar station of all-round view, for example ship navigation radar station. Method comprises receiving direct and re-reflected radar signals from the underlying surface, generated when the main lobe of the radar antenna (echo signals) is directed thereto, detection of direct pulse signals of radar station, and pulse signals re-reflected by underlying surface, determination of time parameters of signals. Receiving of said direct and re-reflected signals is carried out by passive direction finder (PDF) with full rotation of radar station survey antenna, determining period of complete revolution of radar antenna T_rev, thereafter, the time interval t_i<T_rev is measured, the radar station antenna is turned relative to the direction on the passive direction finder. Then, signals received at time t_i with passive direction finder beam are detected, radar antenna turning angle is determined relative to direction on passive direction finder by formula: α_ki=2πt_i/T_rev. Further, the re-reflected signal duration is measured τ_R1 and τ_R2, received during beam turns respectively at angles α_ki and (α_ki+π), after which angle is determined β_k1 between the direction on the radar station and the direction of the passive direction finder beam axis and the distance R_k to the radar station.

EFFECT: technical result of the invention is broader functional capabilities of the method by determining the direction of the surveillance radar and range thereof in the absence of radio-contrast reflecting objects on the ground, with simultaneous increase in the measurement results reliability and range of measurements when using the antenna with a wide beam pattern, which enables to implement the method in small-size systems.

1 cl, 7 dwg