Research Of Real Time Echo Simulation Technology For Radar Point Target

Radar point target echo simulation technology is a key technology in the test of a certain type of radar.With the rapid development of radar system development technology,the test demand for various types of radar is increasing,and a large number of radar target echoes are required to perform radar system test.This technology plays an important role in the functional verification and performance testing of radar signal processors.The existing echo simulation technology has the disadvantages of low sampling rate,poor sampling and playback effect of the IF signal,and the inability to perform real-time calculation of the target signal.The content of the research on the above problems is as follows.Firstly,this paper studies the actual needs of the point target echo from the radar test system,mainly focusing on the requirements of radar IF signal acquisition,real-time processing and forwarding.On this basis,the overall design of the system is proposed,and the theoretical simulation of the design is completed.Then it introduces the selection and structural design of the hardware platform,and introduces the overall design of the system from a modular perspective.Secondly,aiming at the problem of resources wasting introduced by independent receiving and transmitting core exploited during the implementation of the high-speed link of the JESD204 B protocol of the system,the bidirectional GTH transceiver is used to simplify the structure of link by analyzing the structure of the GTH transceiver,the clock and the layered structure of the JESD204 B protocol.The feature establishes a link transmission and reception structure that shares the physical layer,thereby effectively improving the utilization of transceiver resources.Thirdly,for the actual needs of IF signal real-time calculation and IF forwarding in the target simulation process,digital orthogonal transformation is used to obtain the baseband signal of the IF signal,and then the decimation filter is used to reduce the sampling rate of the baseband signal,which reduces the amount of data and facilitates real-time calculation;Using the DUC module in the DAC chip to modulate the baseband signal to the IF to achieve the IF forwarding requirements.Finally,the distance simulation,speed simulation,undulation model simulation,and clutter simulation of the target are completed on the baseband signal,and the function verification and test of the target simulation technology are carried out on the built hardware platform.The experimental results show that the radar point target technology designed in this paper can effectively complete the radar point target simulation process in the form of IF signals,and has good real-time performance.which has a high practical value.