| 摘要(英) |
The Chung-Li VHF radar is located near the airport, and due to its geographic advantage, it can observe many airplanes traveling through it. In this paper, we design an algorithm based on DBSCAN (Density-based spatial clustering of applications with noise) to read the aircraft signals automatically, and the second algorithm for automatic reading of aircraft signals is based on the Hilbert-Huang Transform (HHT), which we refer to [2020, Hong Xuan-wan]. The algorithms′ positive and false positive rates are compared using interferometric antenna observation data from November 6, 2022. Subsequently, the algorithm with a lower false positive rate and faster computation rate, DBSCAN, is used to compute aircraft positions in three-dimensional space by radar interferometry. Then, the aircraft positions are estimated in comparison with aircraft GPS positions from Automatic Dependent Surveillance-Broadcast (ADS-B), obtaining the radar′s initial system phase deviation [0.3419, -0.2279, 1.0017, -1.5031] (unit: radians). This enhances the future positioning accuracy of other targets observed by the interferometric antenna. Furthermore, in the analysis of aircraft echo signals from the radar, it is found that the bandwidth widens at zero frequency in the spectrum and there are discontinuous signals on the RTI (Range-Time-Intensity) diagram. After simulation verification, it is concluded that as the aircraft′s speed increases, flight altitude decreases, and the number of non-coherent integration times used in data processing increases, the phenomenon of bandwidth widening when the aircraft crosses the radar beam becomes more significant. The discontinuous signal phenomenon may be caused by destructive interference from secondary echoes formed by ponds. |
| 參考文獻 |
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