数字化仪表着陆系统发射通道校准算法

在对仪表着陆系统（ILS）的数字化改造中，针对仪表着陆系统采用振幅式测角体制，对发射信号的幅度失真敏感的问题，提出了一种数字化仪表着陆系统发射通道校准算法。首先，建立了仪表着陆系统发射端的数学模型，仿真研究了发射通道非线性对仪表着陆系统测角性能的影响；其次，提出了一种在数字化仪表着陆系统发射机中引入反馈回路的发射机结构；最后，通过在基带利用最小均方（LMS）算法求解发射通道的逆模型，并利用该逆模型补偿发射通道的非线性失真，实现了发射通道的校准。仿真结果表明，该算法可以在噪声条件下快速估计出发射通道的逆模型，具有良好的校准性能。

Transmission channel calibration algorithm for digital instrument landing system

In the digital Instrumentation Landing System (ILS) transformation, aiming at the problem that the ILS adopts the amplitude angle measuring system and is sensitive to the distortion of the amplitude of the transmitted signal, a calibration algorithm of the transmission channel of the digital ILS was proposed. Firstly, the mathematical model of the transmitter's landing system was established, and the effect of the non-linearity of the transmission channel on the angular performance of the ILS was simulated. Secondly, a transmitter structure with a feedback loop in the digital instrumentation landing system was proposed. Finally, the transmission channel was calibrated by solving the inverse model of the transmission channel in the baseband using the Least Mean Square (LMS) algorithm, and using the inverse model to compensate the nonlinear distortion of the transmission channel. The simulation results show that the proposed algorithm can quickly estimate the inverse model of the transmission channel under noise conditions and has good calibration performance.