随着智慧型 AFC 系统需要支持的票卡种类不断增多,以及客流的不确定性对后台服务器的要求越来越高,云技术在 AFC 系统中的应用也愈显重要。文章着重介绍智慧型 AFC 系统基于城轨云平台部署的系统架构、系统应用方案以及系统验证方案,并...随着智慧型 AFC 系统需要支持的票卡种类不断增多,以及客流的不确定性对后台服务器的要求越来越高,云技术在 AFC 系统中的应用也愈显重要。文章着重介绍智慧型 AFC 系统基于城轨云平台部署的系统架构、系统应用方案以及系统验证方案,并对几种部署方案进行比选,结合工程经验以及智慧型 AFC 系统基于云平台部署的优势,分析得出最优方案,为后期基于云平台的智慧型 AFC 系统部署提供借鉴和经验。展开更多
This paper proposes a method to improve the spu-rious-free dynamic ranges(SFDRs)of 1-bit sampled signals greatly,which is very beneficial to multi-tone signals detection.Firstly,the relationship between the fundamenta...This paper proposes a method to improve the spu-rious-free dynamic ranges(SFDRs)of 1-bit sampled signals greatly,which is very beneficial to multi-tone signals detection.Firstly,the relationship between the fundamental component and the third harmonic component of 1-bit sampled signals is analyzed for determining four contiguous special frequency bands,which do not contain any third harmonics inside and co-ver 77.8%of the whole Nyquist sampling frequency band.Then,we present a special 4-channel monobit receiver model,where appropriate filter banks are used to obtain four desired pass bands before 1-bit quantization and each channel can sample and process sampled data independently to achieve a good in-stantaneous dynamic range without sacrificing the real-time per-formance or computing resources.The simulation results show that the proposed method effectively eliminates the effect of the most harmonics on SFDRs and the mean SFDR is increased to to 20 dB.Besides,the multi-signals simulation results indicate that the maximum amplitude separation(dynamic range)of two signals in each channel is 12 dB while the proposed monobit re-ceiver can deal with up to eight simultaneous arrival signals.In general,the designing method proposed in this paper has a po-tential engineering value.展开更多
文摘随着智慧型 AFC 系统需要支持的票卡种类不断增多,以及客流的不确定性对后台服务器的要求越来越高,云技术在 AFC 系统中的应用也愈显重要。文章着重介绍智慧型 AFC 系统基于城轨云平台部署的系统架构、系统应用方案以及系统验证方案,并对几种部署方案进行比选,结合工程经验以及智慧型 AFC 系统基于云平台部署的优势,分析得出最优方案,为后期基于云平台的智慧型 AFC 系统部署提供借鉴和经验。
文摘This paper proposes a method to improve the spu-rious-free dynamic ranges(SFDRs)of 1-bit sampled signals greatly,which is very beneficial to multi-tone signals detection.Firstly,the relationship between the fundamental component and the third harmonic component of 1-bit sampled signals is analyzed for determining four contiguous special frequency bands,which do not contain any third harmonics inside and co-ver 77.8%of the whole Nyquist sampling frequency band.Then,we present a special 4-channel monobit receiver model,where appropriate filter banks are used to obtain four desired pass bands before 1-bit quantization and each channel can sample and process sampled data independently to achieve a good in-stantaneous dynamic range without sacrificing the real-time per-formance or computing resources.The simulation results show that the proposed method effectively eliminates the effect of the most harmonics on SFDRs and the mean SFDR is increased to to 20 dB.Besides,the multi-signals simulation results indicate that the maximum amplitude separation(dynamic range)of two signals in each channel is 12 dB while the proposed monobit re-ceiver can deal with up to eight simultaneous arrival signals.In general,the designing method proposed in this paper has a po-tential engineering value.
