Communications: directive radio wave systems and devices (e.g. – Testing or calibrating of radar system – By monitoring
Patent
1990-11-21
1992-07-14
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Testing or calibrating of radar system
By monitoring
342408, 455115, G01S 740
Patent
active
051307162
ABSTRACT:
Microwave landing systems are used to enable aircraft to make landings even in poor visibility. One distinguishes three categories of approach and landing manoeuvers. Of particular importance are Category III operations, i.e., those in which the pilot depends exclusively on the navigation system, because he cannot see the runway. Throughout a Category III landing operation, it must be ensured that the navigation system does not fail, and that the information contained in the signals being radiated by the navigation system is reliable. To that end, two executive monitors are arranged such that the first to detect a signal error functions as a master monitor. If the slave monitor then detects (within a reduced error threshold) the same signal error, an error in the system being monitored is confirmed and appropriate safety measures are taken (e.g. immediate changeover from the faulty transmitter). If the slave monitor does not detect the same signal error using the reduced error threshold, this confirms an error in the monitoring system, and other appropriate safety measures (e.g. orderly system shutdown) are taken.
REFERENCES:
patent: 3085245 (1963-04-01), Wilson et al.
patent: 4541121 (1985-09-01), Blum
patent: 4940984 (1990-07-01), Kleiber
Peter J. Wroblewski, Development of Continuity of Service Requirements for the Microwave Landing System (MLS), Mitre Corp. Sep. 1987.
Blum Theodore M.
Standard Elektrik Lorenz Aktiengesellschaft
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