The glide path (GP) is an integral part of the Instrument Landing System (ILS), working in conjunction with the onboard receiver to provide glide guidance information for aircraft approaching and landing, operates in the 328.6 to 335.4MHz ultra-high frequency range, signal transmission mainly relies on the reflection of the protected area in front of the antenna. However, the mountain ahead has caused problems with the GP at multiple airports. The revised MH/T4003.1-2021 in 2021 is based on the original 2014 version, added obstruction requirements for obstacles ahead. Through computer modeling and simulation, this article conducts simulation analysis on the influence of the mountain in front of the GP on the glide slope structure and glide clearance under different obstruction angles, proposes a solution for the site selection and signal optimization after construction of the GP.
In the case that magnetic levitation (maglev) is required to enter the airport and GBAS VDB is used as a means of aircraft approach in the future, a reasonable layout between maglev line and GBAS VDB is sought. Take maglev vertical across the final approach path of an aircraft as an example. Based on the analysis of the practical measurement RFI data of maglev arc according to three working conditions of maximum power acceleration, maximum power deceleration and passing the test site at a constant speed, and considering the ground reflection of the maglev arc, the EMC of the maglev arc to the VDB signal is analyzed when the VDB is near the runway threshold and far from the runway threshold. The results show that the maximum radiation intensity range of maglev arc is from 56.20 to 57.76 dBμV/m. When the VDB antenna is close to the runway threshold, the protection ratio of the maglev arc to the VDB signal will not be less than 26 dB, unless the maglev is within 410 m from the runway threshold.
Free space propagation loss of aeronautical radio navigation station is calculated according to transmitting antenna height, receiving antenna height, frequency, distance between transmitting antenna and receiving antenna, comparing with traditional free space propagation loss algorithm. The data calculated from the algorithm is checked by flight check data combined with site data around navigation station.
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