摘要：针对低轨小卫星星座的通信需求,设计了基于双棱镜和四象限雪崩光电二极管(QAPD)结构收发同轴的激光通信载荷,该方案是无信标光体制,具有体积小、轻量化和大视场的特点。文中针对双棱镜结构,给出了双棱镜输入输出光线的计算模型,在此基础上,提出了星间指向、捕获和跟踪的实现方式,并在XY-2号卫星上进行了在轨测试和验证,进行指向测试时,更新了指向偏移量,标定了QAPD跟踪点,并进行了双向建链测试。进行了15次双向建链测试表明,该激光通信载荷捕获时间小于20 s,捕获成功率达到100%,捕获后双星建链时间优于2 s,建链测试成功率达到了93%,建链后跟踪精度RMS值小于30μrad。

摘要：针对以闪存为存储介质的存储器设计参数化的实时RS编译码策略,能够适应不同的图像分辨率。给出完整的具有RS编译码的记录系统存储和读出方案,解决闪存数据翻转时系统的可靠存储问题,提高系统的可靠性,实时检纠错效果比较好,每个RS过程可纠正3个字节随机错误。在640×480像素的图像分辨率下,最大页纠错能力达72字节,信噪比提高2 dB以上。

摘要：To obtain the peak response at 532nm, narrow-band response GaA1As photocathodes with two GaAIAs ac- tive layers of different aluminum compositions are designed in consideration of the maximum absorptivity and quantum efficiency. The transmission-mode and the corresponding reflective-mode photocathodes are grown by metalorganic chemical vapor deposition. The results indicate that the peak response and the cut-off wavelength occur at 532nm for the two kinds of photocathodes respectively. The response of the reflection-mode photoeath- ode is an order of magnitude higher than that of the transmission-mode photocathode, whereas the better growth quality and the thicker second GaAIAs active layer can improve the transmission-mode response.

摘要：针对城市污水管网的维护和管理只能采取人工检测方式而缺乏有效手段的问题,提出基于插入式多因子探头的城市污水管网流量监测系统.该系统实现对污水管网中污水流量的自动实时监测,提高城市的污水排放管理水平,降低污水管网的维护成本.在实际应用中,可以实现对污水流量的监控、预警和故障点的报警定位等功能.