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为了尽可能多地用软件来实现仪表着陆系统(ILS)接收机的信号处理,需要对导航信号进行数字化,而基于多相滤波的数字正交变换无需正交本振,结构上也更适用于实时处理系统。介绍了ILS的工作原理及信号体制,研究了基于多相滤波的ILS信号的数字正交变换技术,通过MATLAB仿真验证了设计的可行性。
In order to realize as much as possible signal processing of the ILS receiver by software, the navigation signal needs to be digitized, while the digital orthogonal transform based on the polyphase filtering needs no orthogonal local oscillation and is also structurally more suitable for Real-time processing system. The working principle and signal system of ILS are introduced. The digital orthogonal transformation technology of ILS signal based on polyphase filtering is studied. The feasibility of the design is verified by MATLAB simulation.