An Efficient Combined Sequential Equivalent Sampling Method

Abstract

The invention provides an efficient combined-type sequential equivalent sampling method by combining a real-time sampling method and a sequential equivalent sampling method. The efficient combined-type sequential equivalent sampling method comprises the steps of S1, collecting a plurality of samples in a mode of being similar to the real-time sampling method in the first radar pulse repetition period; S2, performing slight time delay on trigger pulses sampled and held in the previous period and then performing real-time sampling in a mode of being similar to the sequential equivalent sampling method in the next adjacent radar pulse repetition period; and S3, repeating the step S2 for multiple times until completion of data acquisition, and sequentially interleaving and recombining multiple samples of the multiple periods so as to form signal waveform of one period. The method provided by the invention can effectively reduce the number of interleaving and recombining periods of a traditional sequential equivalent sampling method, overcome the defect of low efficiency and achieve the purposes of significantly improving the equivalent pulse repetition frequency of radar and improving the energy utilization rate of ultra-wide band transmission pulses.

Description

technical field [0001] The invention belongs to the field of ultra-wideband through-wall imaging radar, in particular to a combined sequential equivalent sampling method that can be used for receiving and collecting ultra-wideband through-wall imaging radar echo signals. Background technique [0002] Ultra-wideband pulses have the advantages of good penetration, high resolution, and strong ability to suppress multipath clutter, and are widely used in through-wall imaging radars. However, since the UWB pulse is a narrow pulse signal in the time domain without a carrier, and its spectrum range is very wide, the sampling reception of the UWB pulse becomes the difficulty of the UWB through-wall imaging radar. [0003] Signal sampling techniques fall into two main categories: real-time sampling and equivalent-time sampling. Real-time sampling usually samples periodic or non-periodic signals at equal time intervals, such as figure 1 As shown, and according to the requirements of...

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Problems solved by technology

However, figure 2 The traditional sequential equivalent sampling method shown in the figure only collects one sample in each cycle, which greatly reduces the radar's PRF (Pulse Repetition Frequency, pulse repetition frequency), which will reduce the utilization rate and efficiency of radar transmission energy

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