75 Ah锂离子蓄电池作为IGSO卫星储能电池得到在轨应用,数据表明两组蓄电池在轨性能一致性高,单翼蓄电池组内22串电池的电压离散度小于20 m V,蓄电池温度梯度小于3.5℃,一个长光照期内,蓄电池荷电态保持在70%~80%,进行补充充电3次。蓄电...75 Ah锂离子蓄电池作为IGSO卫星储能电池得到在轨应用,数据表明两组蓄电池在轨性能一致性高,单翼蓄电池组内22串电池的电压离散度小于20 m V,蓄电池温度梯度小于3.5℃,一个长光照期内,蓄电池荷电态保持在70%~80%,进行补充充电3次。蓄电池在轨实践表明蓄电池设计合理,性能稳定可靠,在轨管理方法合理有效。展开更多
The Combined-GEO-IGSO constellation is the combination of Geostationary Earth Orbit(GEO) satellite and Inclining GeoSynchronous Orbit(IGSO) satellite.The Combined-GEO-IGSO constellation can integrate the advantages of...The Combined-GEO-IGSO constellation is the combination of Geostationary Earth Orbit(GEO) satellite and Inclining GeoSynchronous Orbit(IGSO) satellite.The Combined-GEO-IGSO constellation can integrate the advantages of GEO and IGSO to achieve regional coverage.In order to discuss the performances of the Combined-GEO-IGSO constellation,the performances of coverage,elevation,diversity,and transmission are simulated in China and surrounding regions by Satellite Tool Kit(STK).The simulation results show that:the combined constellation can reach higher multi-satellite coverage and higher communication elevation in China and surrounding areas;the Doppler shift,delay,and propagation loss of this constellation have little impact on the system.As regional coverage constellation,the Combined-GEO-IGSO is feasible.展开更多
针对北斗B1频段MEO/IGSO卫星上NH码调制导致捕获难度增大的问题,对GPS所用的差分捕获算法进行改进,得出了一种适合北斗B1 MEO/IGSO卫星的捕获算法。通过本地生成经NH调制的C/A码作为新的伪随机码,加长相干积分时间,以差分累加的方式对...针对北斗B1频段MEO/IGSO卫星上NH码调制导致捕获难度增大的问题,对GPS所用的差分捕获算法进行改进,得出了一种适合北斗B1 MEO/IGSO卫星的捕获算法。通过本地生成经NH调制的C/A码作为新的伪随机码,加长相干积分时间,以差分累加的方式对相干积分结果进行运算,并按照累加结果最大准则判断差分项的符号,找出最佳搭配组合。仿真结果表明,改进算法能提高2 d B^3 d B的增益。展开更多
文摘75 Ah锂离子蓄电池作为IGSO卫星储能电池得到在轨应用,数据表明两组蓄电池在轨性能一致性高,单翼蓄电池组内22串电池的电压离散度小于20 m V,蓄电池温度梯度小于3.5℃,一个长光照期内,蓄电池荷电态保持在70%~80%,进行补充充电3次。蓄电池在轨实践表明蓄电池设计合理,性能稳定可靠,在轨管理方法合理有效。
基金Supported by the National Natural Science Foundation of China (No. 60972061,No. 60972062,and No. 61032004)the National High Technology Research and Development Program of China ("863" Program) (No. 2008AA12A204)the Natural Science Foundation of Jiangsu Province(BK2009060)
文摘The Combined-GEO-IGSO constellation is the combination of Geostationary Earth Orbit(GEO) satellite and Inclining GeoSynchronous Orbit(IGSO) satellite.The Combined-GEO-IGSO constellation can integrate the advantages of GEO and IGSO to achieve regional coverage.In order to discuss the performances of the Combined-GEO-IGSO constellation,the performances of coverage,elevation,diversity,and transmission are simulated in China and surrounding regions by Satellite Tool Kit(STK).The simulation results show that:the combined constellation can reach higher multi-satellite coverage and higher communication elevation in China and surrounding areas;the Doppler shift,delay,and propagation loss of this constellation have little impact on the system.As regional coverage constellation,the Combined-GEO-IGSO is feasible.
文摘针对北斗B1频段MEO/IGSO卫星上NH码调制导致捕获难度增大的问题,对GPS所用的差分捕获算法进行改进,得出了一种适合北斗B1 MEO/IGSO卫星的捕获算法。通过本地生成经NH调制的C/A码作为新的伪随机码,加长相干积分时间,以差分累加的方式对相干积分结果进行运算,并按照累加结果最大准则判断差分项的符号,找出最佳搭配组合。仿真结果表明,改进算法能提高2 d B^3 d B的增益。
