“…The GP emits a horizontally polarized fan-shaped synthetic field, with a horizontal direction of ±8°in front of the GP(parallel to the runway)and a vertical direction between 0.45θand 1.75θ(θ is the glide angle),The signal coverage shall not be less than 18.5km, as shown in the Figure 1. Due to the particularity of airport construction, the location of GP is particularly important for mountainous and plateau airports, which are affected by surrounding mountains 5,6 . In addition to the natural mountains, in recent years, with the construction of the new economic zone around the airport, large buildings have emerged in front of the GP, causing the signal of the GP to gradually deteriorate and unable to be improved through equipment debugging.…”