Design And Implementation Of Multi-channel IR-UWB Receiving System

Ultra-wideband technology has many advantages such as high data rate,strong anti-multipath capability,good penetration,etc.Therefore,ultra-wideband technology has a wide range of applications in short-distance communication,area navigation and radar detection.At present,its typical applications include indoor high Accurate positioning,high-resolution imaging of underground targets,non-contact detection of vital signals(breathing,heartbeat),etc.However,the ultra-wideband signal has a narrow pulse and a large bandwidth,so it places higher requirements on its reception.To realize the reconstruction of ultra-wideband signals,the bandwidth of the ultrawideband receiver must match the transmitted signal,and the sampling rate must reach higher than GSPS.However,due to the limitations of the analog-to-digital converter(ADC)manufacturing process,it is difficult to achieve both high accuracy and high speed,so the design of ultra-wideband receivers is a challenging task.This article focuses on the research of UWB receiver technology,and designs and implements a three-channel pulse UWB receiving system.The receiver adopts sequential equivalent time sampling method,with adjustable clock frequency,scale of sampling time window and equivalent sampling rate up to 5000 GSPS.The measurement results of the principle prototype show that the scheme in this paper is feasible and has obvious advantages over the traditional scheme in terms of system complexity,efficiency,volume,flexibility and power consumption.Further optimization can be directly applied to the ultra-wideband system.The main contents of this article are:First,it introduces the research background of this subject,clarifies the development prospects of UWB technology,and points out the research significance of UWB receivers.Then it deeply analyzes the research status domestically and abroad,compares the technology gaps,and indicates the purpose of this article.Secondly,the UWB receiver is briefly introduced,incorporating the functional principle,conventional performance indicators,and the implementation methods and performance of five different receiver structures.Then,the equivalent time sampling method is analyzed,and the advantages and disadvantages are compared between random equivalent sampling and sequential equivalent sampling,and the traditional implementation of sequential equivalent sampling is introduced.Then the design method of this subject is proposed.Based on the functional principle of the direct digital frequency synthesizer,the traditional equivalent time sampling method is improved innovatively.On this basis,the system design plan of this subject is proposed.Then the specific contents of the program are elaborated one by one from the aspects of module circuit design,module function control and engineering implementation.Afterwards the test system was built,the experimental test of the principle prototype was carried out,and the experimental results were analyzed.Finally,it summarizes the content of the article,and points out the remaining shortcomings and ideas for improvement.