| Active phased array radar (APAR) using digital beam forming technology (DBF) has the ability to form electrical scan antenna beam quickly. The APAR can also detect, identify and track quick moving target; meanwhile, the antenna beam has the ability to suppress various types of interference adaptively. Therefore the APAR is the development trend of modern high-performance radar. The development of APAR, as well as performance test and fault test for APAR, requires a signal simulator to provide test signals. Traditional signal simulators cannot meet the requirements of multi-channel, complex waveforms and complex environments of APAR.In this thesis, a radar echo simulator based on FPGA with multi-waveform and multi-channel is developed for APAR. Based on the received parameters from a control system, such as velocity, angle and range of a target, the simulator can generate36channels of base-band signal in real time, where12channels are with a bandwidth of30MHz,16kHz and1.7kHz, respectively. Three working waveforms are involved in the APAR, which are Pulse-Doppler wave, linear frequency modulated chirp and linear frequency modulated continuous wave. Various types of electromagnetic interference, clutter and noise simulating real environments can also be added into the echo-waveforms.The effectiveness and robustness of the multi-waveform and multi-channel simulator is verified. This simulator can be used for various function verifications in APAR, such as digital beam forming, target detection, tracking and so on. |
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