Monitoring of the phase angle of course and clearance signals in an instrument landing system
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United States of America Patent
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Jul 2, 2002
Grant Date -
N/A
app pub date -
Jan 22, 2001
filing date -
Dec 18, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for monitoring a localizer course facility in an instrument landing system, including modulating a course signal at a first signal frequency and at a second signal frequency, and transmitting the modulated course and clearance signals. The method also includes detecting by sensors the modulated course and clearance signals, demodulating the modulated course and clearance signals, monitoring variables obtained from the demodulated course and clearance signals to ensure that the variables are within limit values, and subjecting the demodulated course and clearance signals to Fourier transformation. Also included is determining a first phase difference for a first modulation frequency between the course and clearance signals detected by the sensors and a second phase difference for a second modulation frequency in the course and clearance signals, betweem the course and clearance signals detected by the sensors. Further, the phase differences which have been determined for the first and second modulation frequencies are compared with the limit values provided for each of these differences and a warning signal is produced if the limit values are infringed.
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