Test and Simulation of 9960Hz Subcarrier Modulation for DVOR Station of Civil Aviation

Abstract

In order to solve the problem of 9960Hz subcarrier modulation of DVOR system exceeding the limit, this paper use the test system and three-dimensional modelling and simulation technology to ensure flight calibration passes smoothly. Taking an airport for example, the field test and modeling simulation are carried out in the same situation when the surrounding site and parameters are the same with the flight calibration, ensuring that the results are in good agreement with the flight calibration results. We can get that the substation is the key factor which affects the 9960Hz subcarrier modulation exceeding the limit. After removing the substation, 9960Hz subcarrier modulation meet the requirements, the airport pass the flight calibration one-time finally. This method solves the problem of the 9960Hz subcarrier modulation in a DVOR station and provides the reference basis for the problems encountered in the construction and operation of the navigation station, which ensuring the safety and efficiency of air transportation.