Navigational flux value error compensation - involves algebraic adjustment of sine and cosine terms in error equation

摘要

A flux valve determining the magnetic direction of an aircraft is subjected to disturbances from circulating currents and high permability metals and alignment errors These errors are corrected readily by algebraic adjustment of the sine and cosine terms in the error equation. A flux valve (V) in the tail of an aircraft provides a three phase output (4a, b, c) to an electronic unit (Q) in the nose of the aircraft. The three phase signals with harmonics are converted (R) to sine and cosine of the crude angular direction (O). Multiplication and addition circuits (6) correct these converted signals to sine and cosine of true magnetic direction(O1). A Scott magnetic assembly (9) produces corrected three phase outputs (10a, b, c) for use in an application unit (11).