介绍了珠海一号卫星星座在轨卫星(高光谱卫星OHS和视频卫星OVS)的主要参数;列举了珠海一号影像产品在相关领域的专题产品及实际应用效果;对珠海一号星座的工程建设及其应用进行了展望.

农业干旱监测问题对农业生产具有重要影响,因此精确监测农业干旱具有现实意义.该研究基于MOD16A2全球蒸散产品,计算作物缺水指数(Crop Water Stress Index,CWSI),结合地表温度、植被指数、降水量以及土壤湿度等多源遥感数据为自变量,以3个月时间尺度的标准化降水蒸散指数(Standardized Precipitation Evapotranspiration Index,SPEI-3)为因变量,基于偏差校正随机森林算法构建山东省2000—2019年作物生长季(4—10月)的偏差校正随机森林干旱状况指数(Bias-corrected Random Forest Drought Condition Index,BRF-DCI).并分析CWSI对于构建山东省农业干旱监测模型的影响.结果表明:加入CWSI后,所提出的BRF-DCI指数与SPEI-3观测指数的决定系数为0.72～0.85,优于未加入CWSI之前;加入CWSI后提高了干旱等级监测的准确率;BRF-DCI指数能较好地拟合各月份的SPEI-3指数,决定系数均在0.94以上;BRF-DCI指数能够准确反映山东省典型干旱年的干旱情况,有效监测山东省农业干旱情况.该研究对山东省农业旱情监测及旱灾防御具有较大的应用潜力.

针对传统的舰船检测算法无法有效避免旁瓣效应对结果的影响,及多考虑舰船与背景之间的灰度对比度而未充分利用SAR影像上目标对象的几何特征造成检测精度较低的问题,提出了一种基于舰船多特征的目标检测算法.该方法利用方位角估算法与逐步逼近法剔除旁瓣效应对计算目标对象几何特征(面积、长宽比和矩形度)及灰度对比度特征的影响,利用变异系数法赋予4个特征不同的权重,计算出目标对象的置信度,选取最佳置信阈值,剔除非目标对象,优化检测结果.利用Sentinel-1影像数据对算法进行了验证,并将其与双参数CFAR算法和KSW双阈值算法进行了对比实验.实验结果表明:对于3张背景复杂度不同的影像,所提出的算法质量因子均超过了0.7且耗时最短,同时对于背景较为复杂的影像仍能保持较好的检测性能.

随着深空探测、载人航天、商业火箭和飞行器等各项航天任务的开展,各型号任务对硬件系统的智能化、可靠性、低功耗指标提出了更高的要求,作为系统“大脑”的SoC处理器亟需进行升级换代.本文综述了面向航天新任务应用的人工智能SoC芯片玉龙810,介绍了新一代国产自主可控、高智能、高可靠、低功耗SoC芯片的功能特点、关键技术,重点描述了玉龙810芯片的低功耗设计方法和实现结果,通过优化技术玉龙810芯片动态峰值功耗达到了低于5W的指标.玉龙810芯片采用多核异构架构,主要由4个SPARC V8核、8个GPU核和8个NNA核组成,片内通过AMBA3.0总线实现模块的互联互通,片上还集成H.264/H.265,JPEC2000等片上外设.

描述了立体封装芯片技术的发展概况,SIP立体封装嵌入式计算机系统模块的构成及欧比特公司总线型SIP立体封装嵌入式计算机系统模块产品简介等。

A kind of PCI data acquisition card is designed and realized, which can provide 2 high-speed high-precision analog signal convert channels, a CAN communication interface and a RS485 serial COM interface.

<正>随着航空航天以及武器装备电子信息化程度的日益提高,1553B总线的地位也日益突出,应用也越来越广泛。如何对1553B总线系统的电缆网络特性以及终端通讯协议进行全面有效的测试评估是长期以来的一个重要课题。本文参照GJB5185.5-2004以及GJB289-97等标准,阐述了一种新型的便携式1553B电缆测试系统的设计和实现。

This paper analyses the control theory of the memory controller in S698P4 SoC in detail and gives the corresponding scheme of design and simulation result. The memory controller could control the read and write of memory under the bit-width mode of 32 bit. Now, the processor is in lots production, and the result of test of the real hardware confirms that the memory controller of S698P4 SoC could work with high effect.

This article mainly introduces the S698P4 SoC system structure, multi-clock mechanism and multi-core scheduling mechanism and discusses the effect the mechanism takes for the chip performance. The related technology is verified in industry, and the result it brings infers the viability.

To meet the requirements of 1553B sub-system testing in aviation electronic equipment,a portable 1553B test system,which could test the 1553B cable network and the 1553B terminal communication protocol, was designed and realized.

The concept and basic principle of instruction pipeline was introduced,and it was pointed out that the function of applying pipeline was for improving throughput,and the advantage and disadvantage were also given.The structure of 5-stage pipeline in S698 series single core processors was analyzed,and it was divided into fetch,decode,execute,memory and write.The corresponding scheme of design and the simulation result were given.Now the processor is in lots production,and the result of test of the real hardware confirms that the instruction pipeline can improve the throughput of a processor indeed.

星务中心计算机是微小卫星电子系统的核心部件之一,本文介绍的星务中心计算机是由双TSC695F处理器加外围功能模块实现的,它的主要作用是诊断整星状态、安排整星任务的运行和调度,使卫星能正常的运行.

阐述了32位嵌入式处理器S698体系架构、功能,SOC设计,着重介绍了S698IP核在平台计算中的高可靠设计及在航天领域的广泛应用。