Study on Prototype MLS (Part 2)

—Development of EL subsystem—

Abstract

A prototype elevation equipment of MLS was developed and a field test was carried out at Sendai airport. The transmitting power of the equipment is 25W. The beam width and the side lobe level of the scanning beam antenna are 1.5 degrees and less than -20dB, respectively. The coverage is horizontally ±40 degrees and vertically 0.9 to 15 degrees.

This paper describes the performance of the equipment and results of the test. The results of the test show that the guidance error is less than 0.04 degrees and the tested items of the performance meet the specifications of ICAO SARPs.