新疆奇台拟建的110m全可动射电望远镜(QiTai Radio Telescope,QTT),在引力波探测、黑洞发现、恒星形成、星系起源等基础科学研究领域将发挥重要作用,并可发展应用于深空探测,如探月工程与火星和金星探测.满足众多科学需求需装备超宽带...新疆奇台拟建的110m全可动射电望远镜(QiTai Radio Telescope,QTT),在引力波探测、黑洞发现、恒星形成、星系起源等基础科学研究领域将发挥重要作用,并可发展应用于深空探测,如探月工程与火星和金星探测.满足众多科学需求需装备超宽带、多波束、高灵敏度接收机系统,而大口径射电望远镜接收机技术面临众多挑战.本文论述了国内外射电天文领域大口径射电望远镜接收机技术发展,包含超宽带馈源/极化器、超宽带低噪声放大器、多波束接收机技术的发展与现状,分析了接收机研制过程中的难点与挑战.基于QTT科学目标和技术进展,给出了初期的接收机系统配置方案,分析了接收机的馈电形式、关键器件研制与选型、关键问题与难点.展开更多
On-off keying (OOK) is one of the modulation schemes for non-coherent impulse radio Ultra-wideband systems. In this paper, the utilization of the kurtosis detector (KD) and fourth power detector (FD) receivers for OOK...On-off keying (OOK) is one of the modulation schemes for non-coherent impulse radio Ultra-wideband systems. In this paper, the utilization of the kurtosis detector (KD) and fourth power detector (FD) receivers for OOK signaling is introduced. We investigate the effect of integration interval and the optimum threshold on the performance of energy detector (ED), KD and FD receivers. The semi analytic expression of BER is obtained by using generalized extreme value distribution function for KD and FD receivers. From performance point of view, the simulation results show that FD receiver outperforms KD and ED receivers. In contrast, the sensitivity to the optimum threshold is greatly reduced in KD receiver compared to ED and FD receivers.展开更多
文摘新疆奇台拟建的110m全可动射电望远镜(QiTai Radio Telescope,QTT),在引力波探测、黑洞发现、恒星形成、星系起源等基础科学研究领域将发挥重要作用,并可发展应用于深空探测,如探月工程与火星和金星探测.满足众多科学需求需装备超宽带、多波束、高灵敏度接收机系统,而大口径射电望远镜接收机技术面临众多挑战.本文论述了国内外射电天文领域大口径射电望远镜接收机技术发展,包含超宽带馈源/极化器、超宽带低噪声放大器、多波束接收机技术的发展与现状,分析了接收机研制过程中的难点与挑战.基于QTT科学目标和技术进展,给出了初期的接收机系统配置方案,分析了接收机的馈电形式、关键器件研制与选型、关键问题与难点.
文摘On-off keying (OOK) is one of the modulation schemes for non-coherent impulse radio Ultra-wideband systems. In this paper, the utilization of the kurtosis detector (KD) and fourth power detector (FD) receivers for OOK signaling is introduced. We investigate the effect of integration interval and the optimum threshold on the performance of energy detector (ED), KD and FD receivers. The semi analytic expression of BER is obtained by using generalized extreme value distribution function for KD and FD receivers. From performance point of view, the simulation results show that FD receiver outperforms KD and ED receivers. In contrast, the sensitivity to the optimum threshold is greatly reduced in KD receiver compared to ED and FD receivers.
