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基于DDS的毫米波汽车防撞雷达扫频源设计
刘旭东
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(吉林省经济管理干部学院,长春 130021;长春理工大学,长春 130022)

摘要:

利用直接数字频率合成(DDS)分辨率高、转换速度快的特点，设计了一种基于DDS芯片AD9910的毫米波汽车防撞雷达扫频信号源。通过DDS芯片产生调频、调幅、调相等各种调制信号，实现了在短距离内快速捕捉目标、处理信息、发出告警的功能。所设计的扫频源输出信号中心频率为8.6 GHz，幅度为-16 dBm，相噪为-70 dBc/Hz@ 1 kHz，满足了在多目标检测时对信号源的幅度、稳定度和相噪的要求，从而使DDS技术得以在微波检测领域获得应用。

关键词: 毫米波；汽车防撞雷达；直接数字频率合成数字信号处理串行外围接口扫频源

DOI：

基金项目:

DDS based Sweep Frequency Source Design for Millimeter Wave Automotive Collision Avoidance Radars

(Jilin Province Economic Management Cadre College，Changchun 130021，China;Changchun University of Science and Technology，Changchun 130022,China)

Abstract:

Making use of the merits of high resolution ratio and quick conversion rate of Direct Digital Synthesizer (DDS), a new sweep frequency source is desi gned with DDS chip AD9910 for Millimeter Wave(MMW) Automotive collision avoidanc e radars. Th e rapid functions of catching objects, processing signals and sending alarms are realized through the modulation signals of FM,AM and PM produced by the chip . The center frequency of the output signal is 8.6 GHz, the amplitude is - 16 dBm, and the phase noise is -70 dBc/Hz@1 kHz. The specifications m eet the requirements of stability, amplitude and phase noise in multitarget detection,thus making DDS technique apply in the field of microwave detection .

Key words: millimeter wave(MMW) automotive collision avoidance radar direct digital synthe sizer digital signal processing serial peripheral interface sweep frequency s ource