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无线电罗盘是重要的机载电子设备,对其及时有效的检测是飞机飞行安全的可靠保证。直接数字频率合成是一种重要的频率合成技术,具有分辨率高、频率变换快、应用广泛等优点。本文在说明DDS的基本原理以及DDS芯片AD9854工作特点的基础上,介绍了利用该芯片设计的一种信号发生器,将其用于无线电罗盘的检测,并给出了AD9854和单片机的硬件接口电路以及部分程序代码。
The radio compass is an important on-board electronic device, its timely and effective detection is a reliable guarantee for the flight safety of the aircraft. Direct digital frequency synthesis is an important frequency synthesis technology, with high resolution, fast frequency conversion, wide range of applications and so on. This paper describes the basic principles of DDS and DDS chip AD9854 working characteristics, based on the introduction of a chip design using a signal generator, which will be used for radio compass detection, and gives the AD9854 and microcontroller hardware interface circuit And part of the code.