Cancellation of group delay error by dual speed of rotation

Details Cancellation of group delay error by dual speed of rotation Cancellation of group delay error by dual speed of rotation

G - Physics

01

S

343/107

G01S 3/58 (2006.01)

Patent

CA 1159934

ABSTRACT Radio direction finders using the principle of periodic scanning of a circular array inherently display a bearing error related to the group delay through the receiving, detection and evaluation process. Correcting by subtracting a constant .THETA.0 is simple but it is difficult to keep .THETA.0 constant. The present invention cancels the group delay error instead of compensating for it with a predetermined constant. Scanning is done at angular velocities .omega.1 and .omega.2 for m turns and n turns respectively. The parameters are related by the formulae Image ... (1) n - m = 1 ... (2) Group delay errors are cancelled by computing the true bearing from the formula n.THETA.2 - m.THETA.1 = .THETA. where .THETA.1 and .THETA.2 are the bearing readings at .omega.1 and .omega.2 respectively and .THETA. is the true bearing of the radio target.

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