Multi-channel Parallel Compression Sampling Method for UWB Signals Based on Photoelectric Composite

Abstract

The invention discloses an optical and electrical combination based ultra-wideband signal multipath parallel compression sampling method for mainly solving the problems of shot signal sampling duration, low compression rate and low sampling precision in the prior art. The implementation scheme comprises the steps of generating two paths of optical pulses by using a light source, stretching the two paths of the optical pulses; dividing a radio frequency signal into two paths by using a power divider, modulating the two paths of the radio frequency signals and the two paths of one-time stretched optical pulses, and performing secondary stretching on the two paths of modulation signals respectively; enabling the two paths of secondary stretching signals to pass through a photoelectric detector to obtain two paths of electric signals and then combining the two paths of the electric signals into a time domain stretched signal; and performing sparse representation on the time domain stretched signal by using an orthogonal basis, designing an observation matrix and performing frequency domain compression on the time domain stretched signal by using the observation matrix to obtain sampling data. The optical and electrical combination based ultra-wideband signal multipath parallel compression sampling method realizes big-compression-rate sampling for the signals with relatively long duration, improves the optical and electrical combination compression sampling accuracy, and can be used for high-speed data acquisition and processing such as radar and passive reconnaissance.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a multi-channel parallel compression sampling method for ultra-wideband signals, which can be used for high-speed data collection and processing such as radar and passive reconnaissance. Background technique [0002] Due to the characteristics of high information capacity and low energy consumption, ultra-wideband signals are more and more widely used in communication, radar, sonar and test systems. The acquisition system of ultra-wideband signals and the sampling capability of high rate, high resolution and high compression rate are urgently needed by users. [0003] The research on UWB signal sampling mainly has two aspects: electrical domain multi-channel parallel sampling and optical sampling technology. in: [0004] The multi-channel parallel sampling in the electrical domain is to use the time-alternating analog-to-digital conversion ADC structure fo...

AI Technical Summary

Problems solved by technology

In reality, the signals are complex and diverse, and many signals have a long duration in the time domain, which is a long-duration signal. Obviously, the compressed time width cannot include all the information of the chirp signal, resulting in the omission of signal information, that is, the long-duration signal is sampled, The recovered signal will be very different from the original signal, and the information carried in the original signal cannot be correctly obtained

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