Interference Experiment for the Dual Site ASDE

Abstract

At Tokyo International airport, the necessity for a second ASDE site arises for surveillance of the new runway. However, interference became a problem, when the second ASDE was installed as dual site configuration.

Then, the experimental ASDE was installed at Sendai airport and then an interference experiment was carried out between it and the former one at ENRI. The interference experiment by two interfacial wave suppression methods (transmission timing method and stagger/defruiter function) was carried out.

As a result, the interfacial wave was dramatically suppressed by the transmission timing method for delaying the transmission trigger from the trigger of another station in the half-cycle. In addition, the stagger/defruiter function suppressed the interfacial wave from the radar coverage outside where the suppression was impossible in the transmission timing method. By the using interference rejection method of these two jointly, it was possible to suppress all interfacial waves.