Abstract
TETRA (Terrestrial Trunked Radio) digital trunk system is widely used in civil aviation mobile communications, which can effectively provide protection for the airport ground communication scheduling, especially to ensure the communication between different departments of the airport. However, the existing spectrum resources of the TETRA frequency can no longer meet the demand of the sharply increasing transportation. It is necessary to study the idle frequency suitable for the allocation to the Civil Aviation Mobile Communication in the 806-821MHz and 851-866MHz digital cluster spectrum from the perspective of electromagnetic compatibility numerical calculation. This paper firstly investigates the frequency usage of the TETRA digital trunk system in the airport, and then designs reasonable interference calculation method for the first adjacent channel and the non-first adjacent channel based on TETRA system parameters and interference protection criteria, then calculates the coexistence conditions, isolation and isolation distance of the existing TETRA system and the idle channel TETRA system by using the above methods. Finally, based on the above research results, the recommendations for the idle frequency selection of the digital trunk service are provided.
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