| 摘要 |
<p>The object of the invention is to reduce the adverse effects of reflected electromagnetic radiation on the measurement threshold of a scanning beam (3). It has particular application to the time reference scanning beam (3) of the international microwave landing system (MLS). In the present MLS configuration, the reflection induced errors during the ''TO'' scan (a) are additive to those of the ''FRO'' scan (b). This invention describes a method and apparatus for compensating errors by reversing the phase of the reflections during the ''FRO'' scan, by displacing the phase center (18) of the transmit antenna (36, 37) during that scan. System performance is enhanced by the errors compensation.</p> |
