Executive monitor for microwave landing system

Details Executive monitor for microwave landing system Executive monitor for microwave landing system

1992-11-02

1993-10-19

Sotomayor, John B.

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

Testing or calibrating of radar system

By monitoring

342 35, G01S 740

Patent

active

052549984

ABSTRACT:
A method and means for monitoring a Microwave Landing System (MLS) that provides statistical independence of the monitoring process from the MLS to insure the integrity of the MLS signal format. The r.f. signal transmissions are received by a monitor receiver and down converted to i.f. signals. The i.f. signals are decomposed into in-phase (I) and quadrature (Q) components. The I and Q components are applied to a digital signal processor that derives all synchronizing information from the I and Q components and that effectively reconstructs the complete MLS signal format from the I and Q components. The reconstructed signal format is compared with predetermined standards and an alarm is generated if the reconstructed signal format is out of tolerance. The integrity of the monitoring process is insured by periodically substituting i.f. signals that simulate the MLS signal format but that are out of tolerance. An alarm is generated if the monitor fails to detect the out of tolerance condition of the simulated signal format.

REFERENCES:
patent: 4333081 (1982-06-01), Hofgen
patent: 4757316 (1988-07-01), Brault et al.
patent: 4768035 (1988-08-01), Thurber et al.
patent: 4916451 (1990-04-01), Ishita
patent: 5130716 (1992-07-01), Kleiber
patent: 5132692 (1992-07-01), LaBerge
patent: 5187486 (1993-02-01), Kolzer

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