Method and apparatus for determining the phase angle in position

Details Method and apparatus for determining the phase angle in position Method and apparatus for determining the phase angle in position

1998-10-29

2000-01-25

Issing, Gregory C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

324 7682, 702 72, G01J 504, G01R 1302, G01B 730

Patent

active

060183187

ABSTRACT:
The method and apparatus for determining the phase angle in position transmitters with sinusoidal output signals utilizes a sensor that generates a sinusoidal signal U.sub.0 (.alpha.)=A sin .alpha. and a cosinusoidal signal U.sub.1 (.alpha.)=A cos .alpha.. Linear combinations U.sub.2 =U.sub.0 +U.sub.1 and U.sub.3 =U.sub.1 -U.sub.0 are formed, and the quadrant is determined in a cyclic binary code q.sub.1 q.sub.0 by examining the preceding signs of these signals. Depending on the quadrant, a division U.sub.2 /U.sub.1 or U.sub.2 /U.sub.0 is carried out. The result of this division serves as the address for inquiring a stored angle table. Initially, the analog track signals U.sub.0, U.sub.1 are converted into digital signals, and all additional calculations are carried out in purely digital fashion. During the integral division, the dividend is one of the linear combinations (U.sub.2), and the divisor is, depending on the determined quadrant, either the sinusoidal or the cosinusoidal track signal. In this case, the amount of the divisor always lies within the range above .sqroot.2/2 of the maximum value of the respective track signal.

REFERENCES:
patent: 4506333 (1985-03-01), Porrot et al.

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