Research On Parallel Sampling For Broadband Signal

Thesis based on the core broadband signal high precision sampling method,the algorithm implementation of multi-channel high precision sampling and signal reconstruction of broadband signal is introduced in this paper,including fundamental principle,algorithm implementation,error analysis and correction as well as simulation experiment result.After the arrival of(digital signal processing)DSP technique in 1980 s,it was widely developed and applied into many fields such as integrated circuit engineering,navigation,guidance & control and automation control.Digital system cannot be applicable with data acquisition,which is based on sampling of analog signal.Sampling has direct influence on subsequent digital signal processing result.In case that the broadband signal has larger bandwidth,it is hard to realize high sampling rate and quantization accuracy with single ADC(analog-digital converter namely A/D converter)at the same time.To solve the contradictions between sampling rate and signal bandwidth as well as between it and sampling precision,interleaved ADC is studied in this paper.The realization of frequency and time domain multi-channel sampling methods is mainly demonstrated in this paper.The high precision sampling and reconstruction of broadband signal is realized through multi-channel sampling method.The precision of the signal reconstruction is related to many factors such as performance of reconstruction algorithm,signal bandwidth and sampling quantization precision ADC.Two specific methods for correcting errors are respectively proposed to time domain multi-channel sampling method in this paper.Besides,to have the change in error before and after correction observed and studied easily,the simulation result is given out in the form of chart.The expression inferred from domain channel sampling method by inputting and outputting specific relationship is analyzed in great detail,so that the phase,juxtaposition and amplitude distortion is well solved.Besides,the traditional theoretical algorithm is improved and the simulation experiment of modification algorithm of frequency domain multi-channel sampling is carried out to obtain reconstruction signal with higher precision,thus the correctness and feasibility of the algorithm is proved.