Mode S Signal Environment in Airport and Detection Rate of Multilateration

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Other Title
  • 空港内のモードS信号環境とマルチラテレーションの検出率について

Description

Signals of 1030 and 1090 MHz transmitted by a transponder installed on the aircraft are generally used as the main system of aircraft surveillance in air traffic control. Mode S, consisting of preamble pulses and a data block modulated by pulse position, is one of the types of 1090 MHz signal used, and it is also employed in aircraft collision avoidance systems and the replies for secondary surveillance radar. A multilateration (MLAT) system is a surveillance system on the airport surface that uses mode S signals. The MLAT estimates aircraft positions using the time difference of arrival, where signals are detected by receivers deployed at the airport. However, system degradation can be caused by two factors: signal occupancy with increasing numbers of aircraft, and multipath immunity regarding obstacles. In this paper, a method for estimating the signal environment and MLAT detection rate is proposed. We summarize the relationship between the mode S signal environment and MLAT detection rate using a prototype system deployed at Sendai airport.

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