Ku Band Doppler Radar Front-end Technology Research

Microwave Doppler radar realizes velocity measurement of the target by extracting the Doppler frequency shift. Compared with the traditional speedometers which are difficult to achieve accurate velocity measurements for high-speed ships, microwave speed radar is such a non-contact measurement system which is able to measure the relative velocity of the sea for any high-speed ships, in any sailing posture. Microwave speed measurement radar for its low power consumption, small size, easy installation and maintenance, may be widely used in various types of vessels. Therefore, it will be of great significance to research on the ship-borne Doppler velocity radar front-end.This paper focus on Ku band Doppler radar front-end technology, studying a Doppler Speed radar front-end system and its miniaturization integration technology. At the same time, the passive components of the Speed radar front-end are studied.In this paper the main work accomplished as follows:1. Ku band Doppler Speed radar front-end system(1)Analysis basic theory of Doppler Effect and its application in ship-borne Doppler velocity radar front-end. Compare the characteristics quality of different receiving systems in the Doppler velocity radar.(2) Design, implementation and test the Ku-band speed radar front-end. The test results meet the design specifications adopting non-modulated continuous wave, orthogonal dual-channel system, the zero-IF receiver structure. Get high stability, low phase noise signal source through the phase locked loop technique; the frequency is13.4GHz, the phase noise is-89.23dBc/Hz@1kHz. The single-chip integrated IQ mixers, not only simplify the circuit also ensure that IQ two channel balance.(3) Development of13.4GHz transceiver narrow beam microstrip antenna arrays and its feeding structures. The measured gain of the Antenna array is22.5dB. E-plane-3dB beam width is8.9°; the H-plane-3dB beam width is6.5°. The overall test of Antenna array and speed radar front-end module in the relevant sea trial is satisfactory, realizing The overall application.2. Miniaturization integration technology of Ku band Doppler Speed radar front-end system(1) Study Ku-band LTCC filters and antennas, design related LTCC interconnect structure such as LTCC microstrip to stripline transition, microstrip to microstrip transition of different layers.(2) Design and realization of LTCC miniaturization Doppler radar front-end. Transceiver antenna arrays are embedded in the LTCC multilayer substrate and connected to the front-end components by the through-hole interconnection. The overall size is40×40×1mm3. Realize highly integrated of Radar front-end module and the antenna arrays, achieve the goal of miniaturization.