Over-the-horizontal Radar Emission Components Can 8 Mm

This thesis addresses a decomposition topic of the8mm-band high resolution multi-functional radar experimental system. The system is designed to demonstrate tests on the distance and speed of objects in motion. With different test results under various types of radar-generated waves, it vividly illustrates waveforms’ impact on the accuracy of the results. Continuous wave and pulse wave are used to achieve testing of distance and speed of moving targets. Meanwhile, radar waveforms are altered (FMCW and PN code modulated BPSK signal, etc.) to enhance the resolution and accuracy of test results; center of transmitting frequency is35.52GHz,and the linear sweep bandwidth is±150MHz.The system was established based upon full coherent working principle. Firstly, all levels of frequency of the transmitter link were reasonably planned and factors such as power and noise were taken into consideration. Then appropriate MMIC chips were selected to build the circuit. A100MHz crystal oscillator was set as the reference source and two low phase noise local oscillators (output frequencies are480MHz and1.5GHz, respectively) were built by adopting phase-locked-loop technique. Meanwhile, frequency-processing methods such as mixing and multiply were used to obtain Ka-band transmit signals. Passive components were designed in accordance with system requirements, and they are, one8GHz micro strip Wilkinson power divider, two Ka-band parallel coupled line filters used as transmitter and receiver respectively, one1.6GHz hairpin SIR band-pass filter and one Ka-band waveguide-finline-microstrip transition, etc.Final test results:Low phase noise local oscillator (480MHz PLL, output power6dBm, spurious suppression is better than-70dBc, phase noise-108dBc/Hz@1kHz;1.5GHz PLL, output power9.8dBm, spurious suppression is better than-70dBc, phase noise-99dBc/Hz@1kHz); CW output power of transmitted signal10dBm, pulse peak power28dBm, phase noise of output frequency-83dBc/Hz@10kHz, spurious suppression within the Transmission frequency band-55dBc, and spurious suppression out of the band is better than-65dBc.