單天線FMCW雷達射頻收發(fā)前端高隔離技術(shù)研究
[Abstract]:With the miniaturization of radar and the increasing requirement of low weight, FM CW (FMCW) radar, especially mono-static radar with the same antenna, has been paid more and more attention in both military and civilian fields. However, the design of CW mono-static radar system is faced with a major challenge, how to solve the problem of transmitting signal to receiver leakage. To solve this problem, FMCW radar can be used more widely. Based on this requirement, the research on improving the transceiver isolation of CW radar is carried out in this paper. Firstly, the existing high isolation technologies, including dual-antenna spatial isolation, circulator isolation and various cancellation techniques, are investigated, and the working principle of cancelling technology is described theoretically. On this basis, a scheme combining high isolation circulator with digital closed-loop control radio frequency cancellation technology is proposed, which can greatly improve the isolation between transceivers. The heterodyne structure is used in the error detection circuit. Compared with the traditional analog cancellation technique, the error detection circuit can solve the DC drift problem after analog mixer. Moreover, digital closed-loop control can realize more accurate and flexible cancellation control. In order to verify the feasibility of the scheme, a cancellation system prototype is designed on X band. Firstly, according to the requirements of the system design, the whole process of making the system scheme is introduced, and the system is described in detail according to the function module, and the key performance is analyzed. Then, the design process of microwave front-end circuit and cavity is described in detail, which is one of the main contents of this paper. The design of RF cancellation module (including feed-through cancellation circuit design and error detection circuit design), transmitter power amplifier circuit design, power supply board design, and cavity design are described. The selection of key devices, the design of passive microwave devices, the drawing of circuit diagram and the optimization of cavity structure are described in detail. Finally, the measurement and debugging of microwave circuit in the system are introduced in detail. A separate module is tested first, then assembled together to test. The problems in circuit assembly test are analyzed, and the solutions are given. Finally, the joint test results of the microwave front end show that in the 600MHz bandwidth, the radio frequency cancellation part can reach the cancellation degree above 30dB, plus the isolation degree of the circulator, the whole system can suppress the emission leakage signal more than 70dB. Meet the scheduled requirements. Finally, the paper summarizes the results of the work, looks forward to the follow-up work, and points out the need for improvement.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN957
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