http://worldcat.org/entity/work/id/936302632

Multipath and performance tests of TRSB receivers : interim report : prepared for U.S. Dept. of Transportation, Federal Aviation Administration, Systems Research and Development Service

A landing system simulation program has been carried out in support of the Microwave Landing System (MLS) program of the Federal Aviation Administration. Both scanning beam and doppler scan techniques were simulated and several angle processors were tested with each technique. This report contains the results of extensive simulation evaluations on the time reference scanning beam (TRSB) system. The results of the doppler simulation tests are published in the Calspan Technical notes referenced in this report. A representative set of multipath parameters was selected and used to explore the dynamic characteristics of the TRSB technique. Tests were run to determine the multipath error magnitude as a function of separation angle, amplitude, scalloping frequency and different processor parameters. These tests were conducted on a TRSB simulator that uses a computer to control the multipath parameters for each scan. Typical multipath scenarios were programed that represented the signals an aircraft would receive when flying through a multipath interference region. Some of the multipath scenarios used in the ICAO AWOP evaluations were simulated. The receivers used in the ICAO flight test program were evaluated in the simulator. A breadboard processor was developed that operates as a dwell gate processor, similar to the flight test receivers, or as a single edge processor (SEP) to evaluate the flare system. A closed loop simulation, including aircraft and autopilot characteristics, MLS signals with dynamic multipath characteristics and the MLS processor, was used to determine the aircraft perturbations resulting from hangar multipath reflections.

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