We consider the quantum mechanical SU(2) transformation e^2λJzJ±e^-2λJz = e^±2λJ±as if the meaning of squeezing with e^±2λ being squeezing parameter. By studying SU(2) operators (J±,...We consider the quantum mechanical SU(2) transformation e^2λJzJ±e^-2λJz = e^±2λJ±as if the meaning of squeezing with e^±2λ being squeezing parameter. By studying SU(2) operators (J±, Jz) from the point of view of squeezing we find that (J±,Jz) can also be realized in terms of 3-mode bosonic operators. Employing this realization, we find the natural representation (the eigenvectors of J+ or J-) of the 3-mode squeezing operator e^2λJz. The idea of considering quantum SU(2) transformation as if squeezing is liable for us to obtain the new bosonic operator realization of SU(2) and new squeezing operators.展开更多
近年来北斗2号卫星导航接收机在军民用领域得到广泛应用。随着北斗3号卫星导航系统的不断发展和完善,北斗3号单模多频点卫星导航接收机的研制成为北斗卫星导航领域重要研究方向之一。结合北斗3号卫星导航系统不同频点卫星信号特点,从工...近年来北斗2号卫星导航接收机在军民用领域得到广泛应用。随着北斗3号卫星导航系统的不断发展和完善,北斗3号单模多频点卫星导航接收机的研制成为北斗卫星导航领域重要研究方向之一。结合北斗3号卫星导航系统不同频点卫星信号特点,从工程实际应用的角度出发,设计了一种基于FPGA(field-programmable gate array)+DSP(digital signal processing)架构的北斗3号单模多频点卫星导航接收机。通过对接收机总体架构进行设计,详细阐述了不同频点卫星信号射频模块、基带信号捕获跟踪模块、导航定位解算模块的机理,设计了对应的北斗3号卫星导航接收机硬件驱动电路。最后,通过卫星导航信号模拟器端设置静态、高动态定位场景,验证设计方案的可行性。试验结果表明,设计并实现的接收机能够满足技术指标要求,进一步验证了本文提出方案的有效性。展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.11175113 and 11275123)the Key Project of Natural Science Fund of Anhui Province,China(Grant No.KJ2013A261)
文摘We consider the quantum mechanical SU(2) transformation e^2λJzJ±e^-2λJz = e^±2λJ±as if the meaning of squeezing with e^±2λ being squeezing parameter. By studying SU(2) operators (J±, Jz) from the point of view of squeezing we find that (J±,Jz) can also be realized in terms of 3-mode bosonic operators. Employing this realization, we find the natural representation (the eigenvectors of J+ or J-) of the 3-mode squeezing operator e^2λJz. The idea of considering quantum SU(2) transformation as if squeezing is liable for us to obtain the new bosonic operator realization of SU(2) and new squeezing operators.
文摘近年来北斗2号卫星导航接收机在军民用领域得到广泛应用。随着北斗3号卫星导航系统的不断发展和完善,北斗3号单模多频点卫星导航接收机的研制成为北斗卫星导航领域重要研究方向之一。结合北斗3号卫星导航系统不同频点卫星信号特点,从工程实际应用的角度出发,设计了一种基于FPGA(field-programmable gate array)+DSP(digital signal processing)架构的北斗3号单模多频点卫星导航接收机。通过对接收机总体架构进行设计,详细阐述了不同频点卫星信号射频模块、基带信号捕获跟踪模块、导航定位解算模块的机理,设计了对应的北斗3号卫星导航接收机硬件驱动电路。最后,通过卫星导航信号模拟器端设置静态、高动态定位场景,验证设计方案的可行性。试验结果表明,设计并实现的接收机能够满足技术指标要求,进一步验证了本文提出方案的有效性。