高度跟踪器对于机载防撞系统( TCAS)能否可靠工作至关重要。传统的高度跟踪器采用线性α-β跟踪器，高度报告的“粗量化”精度将导致线性α-β跟踪器的性能劣化。为此，设计了一种对30 m量化精度高度报告的非线性跟踪器。核心思想是利用多次高度层穿越占用时间以及穿越高度层数来计算高度率，并将飞行过程划分为5个不同状态，不同状态采用不同高度率修正公式。仿真结果及误差分析显示非线性高度跟踪器在跟踪精度和响应时间两方面均优于线性α-β跟踪器，有效提高了TCAS做出防撞决策的可靠性。%The altitude tracker is extremely important for reliable work of Traffic Collision Avoidance System ( TCAS) . Traditional altitude trackers use linearα-βtrackers. The“rough quantization” accuracy of alti-tude report will lead to performance deterioration of linearα-βtrackers. This paper designs a nonlinear al-titude tracker to quantize the altitude report with 30 m(100 ft) accuracy. The key idea is to utilize the oc-cupation time and the levels of the traversed altitude quantization to compute the altitude rate. Simultane-ously,it divides the flight process into five states,each of which uses different correction formulas to calcu-late the altitude rate. Both the simulation results and error analysis demonstrate that the nonlinear altitude tracker improves the tracking precision and response time more evidently than linear α-β trackers, and provides high reliability for TCAS to make collision avoidance decisions.
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