METHOD OF DETERMINING NON-RADIAL PROJECTION OF TARGET VELOCITY VECTOR Russian patent published in 2013 - IPC G01S13/58 

FIELD: radio engineering, communication.

SUBSTANCE: target is simultaneously irradiated by two spaced-apart antennae with probing signals at two different frequencies; signals reflected from the target are received; frequency difference of the received signals is determined, and said difference is used to determine the non-radial projection of the velocity vector of the target; the target is further irradiated with two auxiliary monochromatic signals at different frequencies. The auxiliary signal at higher frequency is emitted by the same antenna which emits a probing signal at lower frequency and the auxiliary signal at lower frequency is emitted by the same antenna which emits the probing signal at higher frequency. Signals reflected from the target are received and the formula $$V_D=c\frac{(F_3-F_4)-(F_1-F_2)+(f_1-f_2)-(f_3-f_4)}{\left|(f_1+f_4)r_1^0-(f_3+f_2)r_2^0+[(f_1-f_2)-(f_3-f_4)]r_{res}^0\right|}$$ is used to determine the projection of the velocity of the target on the direction of vector D, determined using the formula $$D=(f_1+f_4)r_1^0-(f_3+f_2)r_2^0+\left[(f_1-f_2)-(f_3-f_4)\right]r_{res}^0,$$ where c is the speed of light; f₁ and f₂ are the frequency of the first and second probing signals; f₃ and f₄ are the frequency of the first and second auxiliary signals; F₁ and F₂ are the frequency of the first and second received signals shifted from f₁ and f₂; F₃ and F₄ are the frequencies of the received monochromatic signals shifted from f₃ and f₄; r₁ ⁰ and r₂ ⁰ are unit vectors directed towards the target from points of location of the first and second transmitting antennae, respectively, r_res ⁰ is a unit vector directed towards the target from the point of location of the receiving antenna.

EFFECT: determining non-radial projections of the velocity vector of a target with low requirements for coherence of the received signals.

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