METHOD OF DETERMINING INCLINED RANGE TO MOVING TARGET USING PASSIVE MONOSTATIC DIRECTION-FINDER Russian patent published in 2015 - IPC G01S3/00 

FIELD: radio engineering, communication.

SUBSTANCE: method includes combined processing of two consecutive bearing measurements (azimuth angles to a target β₁ and β₂) and signal power values P_s1 and P_s2, received by a self-contained radial system for the considered measurement times t₁, t₂, taking into account that the measurement base point corresponds to the geometric centre of the self-contained radial system, and a line T₁T_N - the trajectory of the target - corresponds to points T₁ and T₂ of measuring the bearing to the target at time t₁ and t₂, assuming that the target moves in a straight line, and then calculating the values: , performing two consecutive measurements of the received frequency f₁, f₂ at measurement time t₁, t₂ and, based on the measurements, determining the values and Δβ₂₁=β₂-β₁, and then determining range to the target using the formula: $${\text{R}}_{\text{2}}=\frac{sT\left(1-K_{f12}\right)}{\left(K_{f12}\sqrt{Q_{21}}+1\right)\cos \left(\Delta {\beta }_{21}\right)-\left(\sqrt{Q_{21}}+K_{f12}\right)}$$ .

EFFECT: determining inclined range to a target moving in a straight line without prior data on the speed of the target.

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