深空测控通信通常采用提高载波频率、增大抛物面天线口径等措施来增强设备的跟踪性能,但同时带来了天线的半功率波束宽度变窄、动态特性降低和天线抗阵风扰动能力变弱等问题。大风扰动引起的天线变形和指向偏差会导致深空探测的增益损失...深空测控通信通常采用提高载波频率、增大抛物面天线口径等措施来增强设备的跟踪性能,但同时带来了天线的半功率波束宽度变窄、动态特性降低和天线抗阵风扰动能力变弱等问题。大风扰动引起的天线变形和指向偏差会导致深空探测的增益损失,增益下降会引起测控跟踪不稳定、数据误码率增加、接收机失锁和遥控无法完成等情况,影响测控任务的正常执行。针对大风扰动对我国某深空站转台式35 m A-E座架双反射面天线执行深空探测任务的影响,通过实测数据统计分析了场区全年风速、风向的变化特点,对跟踪弧段内风速与天线指向角度误差数据进行了对比分析,仿真计算了在不同风速、风向情况下天线指向角度误差及对上下行测控链路增益的影响,结合设备现有技术设施,提出了在执行实时任务中的应对策略,降低了大风扰动对测控任务的影响,提高了设备任务执行能力。展开更多
From April 9 to 27, the Chinese Music Orchestra of China National Opera ＆ Dance Drama Theater traveled to Shaanxi, Henan and Anhui provinces. The 2018 Classic Art on Campus -- the Folk Concert On the Road by the Chin...From April 9 to 27, the Chinese Music Orchestra of China National Opera ＆ Dance Drama Theater traveled to Shaanxi, Henan and Anhui provinces. The 2018 Classic Art on Campus -- the Folk Concert On the Road by the Chinese Music Orchestra of China National Opera ＆ Dance Drama Theater was held in 12 colleges and universities. Students and teachers got to appreciate the melodious Chinese folk music.展开更多
Chen Sicheng,China's most commercially successful filmmaker,talks with NewsChina about his landmark Detective CT7//75toiw7franchise,Hollywood influence and the challenges facing the Chinese film industry.Start wit...Chen Sicheng,China's most commercially successful filmmaker,talks with NewsChina about his landmark Detective CT7//75toiw7franchise,Hollywood influence and the challenges facing the Chinese film industry.Start with a Jack the Ripper-type killer haunting San Francisco's Chinatown.Feature a mismatched detective duo reminiscent of Holmes and Watson,but way less competent.Then add rising anti-Chinese sentiment in tum-of-the-cen-tury America,the struggles of Chinese laborers who built the railroads and the crumbling Qjng Dynasty(1644-1911).展开更多
The once lucrative business of tiger breeding has dwindled due to increased animal protection regulations,leaving owners out of pocket and tigers in a precarious position.
Forced to perform circus tricks for years,the ongoing saga of Molly the Asian elephant has once again trigered calls to end animal performances and finally set China's animal abuse iaws in stone,Looking exhausted,...Forced to perform circus tricks for years,the ongoing saga of Molly the Asian elephant has once again trigered calls to end animal performances and finally set China's animal abuse iaws in stone,Looking exhausted,an Asian elephant calf stands in the sun,holding a harmonica in her trunk.Her legs are shackled to keep her put during the show.This was among the handful of videos of Molly that went viral on Chinese social media in recent months.展开更多
As China attempts to impose a system of urban garbage recycling,are the informal waste collectors that have kept the cities clean for decades about to be thrown on the trash heap?
文摘深空测控通信通常采用提高载波频率、增大抛物面天线口径等措施来增强设备的跟踪性能,但同时带来了天线的半功率波束宽度变窄、动态特性降低和天线抗阵风扰动能力变弱等问题。大风扰动引起的天线变形和指向偏差会导致深空探测的增益损失,增益下降会引起测控跟踪不稳定、数据误码率增加、接收机失锁和遥控无法完成等情况,影响测控任务的正常执行。针对大风扰动对我国某深空站转台式35 m A-E座架双反射面天线执行深空探测任务的影响,通过实测数据统计分析了场区全年风速、风向的变化特点,对跟踪弧段内风速与天线指向角度误差数据进行了对比分析,仿真计算了在不同风速、风向情况下天线指向角度误差及对上下行测控链路增益的影响,结合设备现有技术设施,提出了在执行实时任务中的应对策略,降低了大风扰动对测控任务的影响,提高了设备任务执行能力。
文摘From April 9 to 27, the Chinese Music Orchestra of China National Opera ＆ Dance Drama Theater traveled to Shaanxi, Henan and Anhui provinces. The 2018 Classic Art on Campus -- the Folk Concert On the Road by the Chinese Music Orchestra of China National Opera ＆ Dance Drama Theater was held in 12 colleges and universities. Students and teachers got to appreciate the melodious Chinese folk music.
文摘Chen Sicheng,China's most commercially successful filmmaker,talks with NewsChina about his landmark Detective CT7//75toiw7franchise,Hollywood influence and the challenges facing the Chinese film industry.Start with a Jack the Ripper-type killer haunting San Francisco's Chinatown.Feature a mismatched detective duo reminiscent of Holmes and Watson,but way less competent.Then add rising anti-Chinese sentiment in tum-of-the-cen-tury America,the struggles of Chinese laborers who built the railroads and the crumbling Qjng Dynasty(1644-1911).
文摘The once lucrative business of tiger breeding has dwindled due to increased animal protection regulations,leaving owners out of pocket and tigers in a precarious position.
文摘Forced to perform circus tricks for years,the ongoing saga of Molly the Asian elephant has once again trigered calls to end animal performances and finally set China's animal abuse iaws in stone,Looking exhausted,an Asian elephant calf stands in the sun,holding a harmonica in her trunk.Her legs are shackled to keep her put during the show.This was among the handful of videos of Molly that went viral on Chinese social media in recent months.
文摘As China attempts to impose a system of urban garbage recycling,are the informal waste collectors that have kept the cities clean for decades about to be thrown on the trash heap?
