Study On Some Key Technologies Of Signal Processing Of Millimeter Waveguide

The millimeter wave seeker can find, identify and track the target at the final phase, which has many advantages, such as small volume, light weight and strong anti-jamming performance. This paper studies millimeter wave LFMCW seeker based on a practical project, which has high range resolution and no range blind of area. The research would be summarized as follows:(1) Waveform design and operating principle of millimeter wave seeker are studied. The ambiguity function of LFMCW signal is derived and the performance of range and velocity measurement is analyzed based on it; because a range-velocity coupling problem is present in LFMCW signal, the principle of the symmetrical wave LFMCW radar is studied for range-velocity decoupling; because this method has the issue that ghost targets will present when multiple-target detecting, the principle of rejecting ghost targets is studied by using changeable slope triangle wave; overall system design plan of millimeter wave seeker is designed.(2) Methods of angle measurement and tracking of seeker are studied. The principle of angle measurement by using single-beam and dual-beam is studied; the system implementation of angle measurement using dual-beam sum and difference patterns of amplitude comparison is analyzed; based on it, for the complex hardware architecture of angle measurement using dual-plane sum and difference patterns of amplitude, a new method that simulates that based on phased array antenna is introduced, and the working principle, error caused and elimination method and signal processing implementation are analyzed.(3) Imaging and target recognition of LFMCW seeker are studied. The adjustment methods of its 1D range profile are analyzed; the target feature extraction and classification methods based on the physical characteristics reflected in 1D range profile are studied.(4) Software and hardware design of signal processing board of LFMCW seeker are studied. In hardware design, every hardware module is designed in detail according to the requirements of signal processing. In software design, every module is implemented by FPGA design and simulation tested.(5) Based on a Ka-band LFMCW radar seeker prototype, the performance of range and velocity measurement, target identification and angle measurement are tested. The test results show that the system is working well.