Research On The Technology Of Dynamic Reconfigurable Wideband Channelized Digital RF Memory (DRFM)

In modern military battlefields,radar is playing an increasingly important role,and its pros and cons often can largely control the trend of war.In practical engineering applications,with the continuous advancement of radar technology,people have put forward higher requirements for the resolution of radar.Today,the coverage bandwidth of radar signals has gradually developed to the GHz level.In order to achieve full-probability interception of UWB radar signals,a broadband digital receiver must process the generated high-speed data stream in real time,but the UWB radar signal has a high sampling rate and a large amount of data.Traditional wideband digital radio frequency storage methods cannot Very well adapted to UWB radar signal storage.And the traditional wideband digital radio frequency storage method will also reduce the real-time performance when processing ultra-wideband radar signals.Aiming at the actual situation,in order to realize the effective expansion of the DRFM instantaneous bandwidth,a new wideband DRFM design method is proposed.This method firstly dynamically estimates the parameters of the ultra-wideband radar signal;secondly,according to the dynamic estimation results of the signal,The signals are divided into real-time channels and processed within the sub-channels.Finally,in order to achieve accurate storage of the received signals,this method introduces a real-time high-precision signal frequency measurement function module.This functional module uses an algorithm implementation based on the FFT-phase push algorithm.First,all-phase pre-processing is performed on the signal to accurately correct the signal phase.Second,in order to ensure the real-time performance of the signal,the method combines the hardware implementation of the segmented convolution and the instantaneous frequency measurement algorithm of the signal,and finally implements the Real-time accurate frequency measurement of high-speed data streams.The new DRFM design method proposed in this paper realizes accurate real-time measurement of ultra wideband radar signal description word(PDW).At the same time,in the application of radar’s active electronic interference,high-fidelity reconstruction of the signal is the key to effective interference.In actual wideband LFM signal processing,due to the current hardware technology level,the amplitude envelope of the time-domain waveform in the high frequency band is rolled down by the hardware amplitude,which causes distortion.Aiming at the practical problems in this engineering application,this paper proposes an optimization algorithm for the amplitude and phase compensation FIR filter coefficients based on the heuristic ant colony algorithm.This article first improves the ant colony algorithm to achieve the mathematical model of FIR filter coefficient optimization.Second,it describes the improvement of the basic ant colony algorithm and the corresponding implementation method.Finally,the FPGA hardware platform is used to optimize the FIR filter coefficients.By comparing with the existing methods,the new method is verified to improve the performance of wideband signal amplitude and phase compensation.In summary,the new DRFM architecture and the new amplitude and phase compensation method proposed in this paper have realized the effective expansion of DRFM instantaneous bandwidth and the high-fidelity reconstruction of ultra-wideband radar signals.