基于DDS技术的搜救信标频率源设计

提出了一种以遇险搜救406 MHz信标机为应用背景,针对其频率源部分,设计输出频率为6 MHz的频率源。该设计通过单片机技术完成定位数据的接收以及曼彻斯特编码;利用DDS实现载波的BPSK调制与频率合成。研究的重点在于GPS芯片与单片机,单片机与AD9852的硬件接口电路,编码解码的工作流程以及椭圆滤波器设计的关键技术,并提出了一种数字化搜救信标机的实现方法。

Design of frequency source for rescue beacon based on DDS

Afrequency source with output frequency of 6 MHz was designed for 406 MHz rescue beacon. In the design,a singlechip positioning data receive and Manchester encoding were achieved by the aid of SCM technology. BPSK modulation and frequency synthesis of carrier wave realized with DDS chip AD9852. The circuits of hardware interfaces from to GPS chip and from singlechip microcomputer to AD9852,as well as the codec program and design of the elliptic filter were researched emphatically.