Development Of A X-band Pulse Radar Front-end

Since the Second World War, X-band radar has been drawn widespread attention both in civilian and military application. The front-end of radar is an important part of the entire radar system, and is the key equipment which determines the performance of the system. The main work of this thesis is to develop a transceiver front-end of X-band pulse radar.This paper analyzed the main theory of the transceiver front-end of radar, and studied the working principle and the basic structure. According to the requirements of the project, this paper proposed the design project of the front-end of the X-band pulse radar using the basic theory. Meanwhile it completed the design and implementation of the transmitter and receiver modules. The main work includes:Firstly, the basic theory of radar was analyzed, and the overall design and the structure were proposed.Secondly, phase-locked source, pulse modulation signal source, pulse modulation amplifier, and single-balanced mixer were designed, and the layout of these circuits were implemented.Then, depending on the needs of system, appropriate RF chips were selected. The layout of the transmitter and receiver were implemented, which determines the final circuit’s layout and the cavity’s structure.Finally, assembling, debugging and test of front-end’s each module were done. In the meantime, the results of test were analyzed.After debugging and test, the front-end of radar achieved the main technical indicators:Transmitter: A Linear Frequency Modulation(LFM) pulse signal is generated, and its center frequency is 9.41 GHz with a bandwidth of 50 MHz. Transmit peak power is no less than 34.46 dBm.Receiver: The noise figure is less than 3dB. The whole gain and the dynamic range is greater than 81 and 82 dB separately.