Importance

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Abstract

A system and technique is disclosed which enables the derivation of phase difference measurements in a VOR system. In the phase difference measurement system, a reference VOR signal and a variable VOR signal are received and multiplied by locally generated sine and cosine signals. The multiplication produces two sine and two cosine signals at very low frequencies which are equal to the difference between the frequency of the received signals and the frequency of the locally generated sine and cosine signals. One sine signal and one cosine signal are shifted in phase relative to their counterparts by the phase difference between the variable and reference signals. These phase shifted signals may be multiplied with their counterparts to produce signals representing the sine and cosine of the phase difference between the variable and reference signal. Thereafter, the arc tangent of the sin/cos ratio is derived to produce a signal representing the phase difference or aircraft bearing.

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First Claim