METHOD OF DIRECTION FINDING OF RADIOSIGNAL SOURCE Russian patent published in 2005 - IPC

FIELD: radio engineering.

SUBSTANCE: method can be used for systems for finding of location of radio signal radiation sources. Method includes receiving of radio signal by means of three non-directional aerials which form ring-shaped equidistant mesh, measuring phase difference among signals from aerials for all the bases formed by reference and other aerials of mesh and finding of primary estimation of direction finding to the source taking those phase differences into account. Aerial signals are additionally and simultaneously conversed into sum-difference signals due to subtraction of reference aerial signal from signals of other aerials. Then signal differences received are added in the first channel and subtracted in the other one and complex amplitude of sum-difference signals S_m are measured. Amplitudes are conversed in the neighborhood of primary estimation of direction finding θ^ into complex angular spectrum of , where m=1, 2 is number of sum-difference channel, θ is possible values of direction finding to source of θ^-π/2<θ<θ^+π/2, D^· ₁(θ)= cos (√3πR/λ·sinθ)-exp(i3πR/λ·cosθ), D^· ₂(θ)= isin(√3πR/λ·sinθ)are directional patterns of sum-difference channels, λ is radiation wavelength, R is radius of mesh. Direction finding is estimated from location of maximum of complex angular spectrum module. Location of maximum of complex angular spectrum module is estimated relatively primary estimation of direction finding by introducing correction in form of relation of first and second derivatives, V(θ^)' and V(θ^)'' correspondingly, of module of complex angular spectrum for direction finding in point of its primary estimation of ▵θ= V(θ^)'/V(θ^)''. Values of first and second derivatives V(θ^)' and V(θ^)'' of module of complex angular spectrum are determined from values of complex angular spectrum in close neighborhood of primary estimation of direction finding V(θ^)'=(V(θ^+δ)-V(θ^-δ))/2δ, V(θ^)''= =(V(θ^+δ)-V(θ^-δ-2V(θ^))/δ², where δ is differentiation constant.

EFFECT: improved precision of direction finding.

3 cl, 5 dwg