With the continuous expansion of urban rail transit network, the traditional intelligent gate passing technology is difficult to meet the needs of passengers for urban rail transit. Technologies such as face recogniti...With the continuous expansion of urban rail transit network, the traditional intelligent gate passing technology is difficult to meet the needs of passengers for urban rail transit. Technologies such as face recognition and credit payment can well solve this problem. Through the innovative technology research and pilot practice research on the scientific research project "multimodal biometrics + credit payment" led by S metro, this paper summarizes and reviews the project organization, development process and technical route, refines the project results, and prospects and plans the application of the project scientific research results in the follow-up engineering projects of S metro.展开更多
In wireless communication system, there is a large frequency bias between carrier frequency and local oscillating frequency. AFC is contributed to eliminate it. A traditional AFC adopts analog loop filter that must wo...In wireless communication system, there is a large frequency bias between carrier frequency and local oscillating frequency. AFC is contributed to eliminate it. A traditional AFC adopts analog loop filter that must work consecutively. However, in W CDMA system, the pilot parts are discontinuous. A novel digital approach of AFC is presented. In this algorithm, we first estimate the fading channel to get the phases and amplitudes of the pilot part symbols, and then combine estimations of multiple paths in one slot length, i.e., obtain one decision variable in each slot. Finally, these judged variables adjust the local oscillating frequency to track the carrier frequency by NCO. The simulation results show that the new AFC algorithm is effective and credible.展开更多
随着全球环境问题与能源危机的加剧,绿色节能理念逐渐成为各行业发展的核心导向。自动售检票系统(Automatic Fare Collection System)简称AFC系统,是公共交通领域以及城市轨道交通的重要组成部分,其节能化、环保化发展对降低公共设施能...随着全球环境问题与能源危机的加剧,绿色节能理念逐渐成为各行业发展的核心导向。自动售检票系统(Automatic Fare Collection System)简称AFC系统,是公共交通领域以及城市轨道交通的重要组成部分,其节能化、环保化发展对降低公共设施能耗、实现可持续发展具有重要意义。本文从绿色节能需求出发,结合AFC系统的技术现状,分析其未来发展趋势,由此提出相关建议。展开更多
文摘With the continuous expansion of urban rail transit network, the traditional intelligent gate passing technology is difficult to meet the needs of passengers for urban rail transit. Technologies such as face recognition and credit payment can well solve this problem. Through the innovative technology research and pilot practice research on the scientific research project "multimodal biometrics + credit payment" led by S metro, this paper summarizes and reviews the project organization, development process and technical route, refines the project results, and prospects and plans the application of the project scientific research results in the follow-up engineering projects of S metro.
文摘In wireless communication system, there is a large frequency bias between carrier frequency and local oscillating frequency. AFC is contributed to eliminate it. A traditional AFC adopts analog loop filter that must work consecutively. However, in W CDMA system, the pilot parts are discontinuous. A novel digital approach of AFC is presented. In this algorithm, we first estimate the fading channel to get the phases and amplitudes of the pilot part symbols, and then combine estimations of multiple paths in one slot length, i.e., obtain one decision variable in each slot. Finally, these judged variables adjust the local oscillating frequency to track the carrier frequency by NCO. The simulation results show that the new AFC algorithm is effective and credible.
文摘随着全球环境问题与能源危机的加剧,绿色节能理念逐渐成为各行业发展的核心导向。自动售检票系统(Automatic Fare Collection System)简称AFC系统,是公共交通领域以及城市轨道交通的重要组成部分,其节能化、环保化发展对降低公共设施能耗、实现可持续发展具有重要意义。本文从绿色节能需求出发,结合AFC系统的技术现状,分析其未来发展趋势,由此提出相关建议。
