Design And Implementation Of Ku-band Radar Signal Source Based On AD9910

The vast need in military greatly promotes the theory and system development of radar. In addition to military applications, radar is used for en route surveillance and terminal area surveillance in air traffic control system. Furthermore, radar is also widely applied in civilian. Pulse compression radar is a new radar system. The most important advantage of which is that it resolves the conflict between detect range, range resolution and velocity resolution. Meanwhile, it has a good anti-jamming performance.Radar waveform parameters play a crucial role in radar performance. The pulse duration is related to the transmitted energy and detecting range. Velocity resolution is proportional to the pulse width in the case of fixed operating frequency, while range resolution is proportional to the bandwidth of the signal. Therefore, by controlling the pulsewidth and bandwidth of the transmitted waveform, long detect range, high range resolution and high velocity resolution can be achieved simultaneously. In addition, the phase noise, spur and linearity etc. of the transmitted signal are always having great effect on the radar signal detection and processing.According to the goals and specifications of Ku-band pulse radar signal source, the VHF band radar signal source has been designed and implemented based on FPGA and DDS chip AD9910. It mainly generates four types of signals:(1) chirp waveform,(2) phase-coded waveform,(3) pulse modulated signal,(4) consecutive waves. Waveforms of fourteen modes are outputted according to the 4-bit wide DDS waveform control code and pilot pulse, and fast switch between the different modes is realized at the same time. The parameters of the waveform include the center frequency, bandwidth, duration and the like. This thesis will present the design and implementation of the radar signal source that meet the specifications from the hardware and software aspects. The main contents are as follows:Firstly, an overview of the development of pulse compression radar systems and frequency synthesizer technologies is presented.Secondly, the basic principle of pulse compression radar and four typical types of pulse compression waveforms is introduced, and specially focus on the principle and characteristics of DDS. The indicators that radar signal source concerns and common techniques to implement it based PLL and DDS techniques are also discussed in the chapter.Thirdly, this part focuses on the experimental section, including developing the module scheme according to the specifications, selecting the suitable part number for DDS and FPGA, presenting the hardware circuit design process, and describing the DDS controller implemented with FPGA in detail.Finally, after the completion of hardware and software debugging, the module test results are given. In addition, problems encountered during the debugging are analyzed. The results of the joint system test are also provided and the final results meet the specifications.