Design And Implementation Of Transceiver Front-end For Continuous-wave Navigation Radar In X-band

Marine navigation radar,as necessary radio navigation device,plays an important role in vessels offshore orientation,entering and leaving port guidance,pilotage in narrow waterway and avoiding collision.To meet the requirements of small and medium-sized fishing vessels for the detection of close targets,and break the foreign monopoly for the continuous-wave navigation radar market and technology,designing continuous-wave navigation radar with our own intellectual-property possesses great market value and significant sense.First,the overall scheme of transceiver Front-end for LFMCW navigation radar in X-band is designed in this thesis.Firstly,combing the theoretical foundation of FMCW Radar and the theory of DDS,the key indicators of the system are determined.Secondly,according to the system architecture design and system solutions,the transmission link adopts DDS + up-conversion + multiplier architecture,the receiving link adopts Zero Intermediate Frequency architecture,and the system is divided into five parts: transmission link,receiving link,clock module,control module and power module.Thirdly,the analysis of the system scheme and the five modules is done to prove that the design is reasonable.Then,the hardware design and implementation of transceiver Front-end for LFMCW navigation radar in X-band are realized in this thesis.The transmission link,the receiving link,the clock module,the control module and the power module are designed.And the DDS module,the up-conversion module,the frequency multiplier module and the LNA module,the down-conversion module and the intermediate frequency amplification module of the transmitting link are designed separately;also,the overall performance of the receiving link is simulated.PCB design is accomplished based on the system schematic,which includes board structure,impedance matching,and design of layout and so on.Some factors such as simplicity,easiness,economy,reliability are considered in overall system hardware design and implementation.Finally,The effectiveness and reliability of the transceiver Front-end are tested and verified.The hardware board welded electrical performance and subsystem modules are tested to ensure that transmission link,receiving link,clock module,control module and power module can work properly.And we set up array antenna + RF transceiver front-end + radar signal board platform for off-site testing.The test results show that the transceiver Front-end for LFMCW Radar in X-band can meet the design requirements.