AM186EM处理器的地址空间优化及应用

本文介绍了一种基于 AM186 EM 处理器的地址空间优化应用,当系统需要处理器支持的最大容量内存时, FLASH 和外围存储器(例如双口 RAM等)可以共用处理器的UCS选通信号,从而实现 FLASH 和外围存储器共用尽可能大的地址空间。同样,当系统需要最大容量的FLASH 时,内存 RAM和外围存储器可以共用处理器的LCS选通信号,从而实现 RAM和外围存储器共用尽可能大的地址空间。     

A reservoir serves as refuge for adults of the endangered Macquarie perch

Home‐range estimates are an important input to species recovery plans. Our aim was to estimate the home‐range size of the endangered Macquarie Perch in the lower Cotter River catchment, Australia. In total, fourteen home‐range estimates were calculated from intensive radio‐tracking of adult individuals over a minimum of five diel periods in either autumn (n = 5) or spring (n = 9). Home‐range (95% Kernel) and core area (50% Kernel) were calculated by Kernel estimation and corrected for overlap with land. Seasonal estimates of home‐range and core area were not asymptotic in relation to cumulative number of radio‐fixes in four of fourteen cases. The mean within‐season home‐range of adult Macquarie perch was 5.5 ha ranging from 0.2 to 18.4 ha, based on 10 cumulative estimates that were asymptotic in relation to radio‐tracking effort. All five individuals radio‐tracked in autumn occupied a single core area, whereas in spring, six individuals occupied a single core area and three individuals each occupied three core areas. Despite individuals moving on a scale almost comparable to Cotter Reservoir (48.5 ha), only a single radio‐tagged individual was found to leave the reservoir and enter the river. Regional fisheries managers are generally aware of the requirement for Macquarie perch to access flowing water for spawning in south‐eastern Australia; however, in the Cotter River catchment, the protection of habitat for this species within Cotter Reservoir is also paramount. Our study highlights the importance of reservoirs for conserving a threatened aquatic species.     

基于DBF技术的星载SAR宽测绘带实现方法

在研究距离向使用数字波束形成(Digital Beanforming,DBF)实现星载SAR宽测绘带原理的基础上,分析了星载DBF-SAR距离模糊与传统星载SAR距离模糊的不同,并利用阵列天线零点指向技术实现宽零陷的原理,展宽模糊点所对应位置零陷宽度,从而在提高星载SAR宽测绘带基础上有效地减小距离模糊,提高成像质量.通过仿真和比较分析,表明使用具有宽零陷指向特性的DBF技术实现星载SAR宽测绘带模式的可行性.     

测距传感器数据在线自适应加权融合

针对移动机器人的测距系统,采用了红外线传感器与超声波传感器共同测距,避免了因使用单个传感器进行多次测量而降低系统的实时性和产生信号串扰问题;应用自适应加权数据融合估计算法对实时测量数据进行在线融合估计,只对当前采样时刻的测量数据进行自适应加权融合,而各传感器的加权因子则通过传感器的测量数据进行方差在线学习估计以自适应方式进行调整,使融合结果的均方误差始终最小,实现两种传感器在功能上的互补;实验结果表明,该方法提高了整体测距精度,得到了被测距离更加准确的估计.     

Ambient‐light sensor system with wide dynamic range enhanced by adaptive sensitivity control

Abstract— A new digital ambient‐light sensor system is presented which employs two linear light sensors with different sensitivities and automatically adjusts the sensitivity based on the illumination condition. The adaptation mechanism allows a very wide range of light intensity to be detected, and the input dynamic range of the system is substantially improved from 22.5 to 45.1 dB. The proposed method does not require any additional precision bits for output data. Due to the small number of the output bits and the simple conversion process, the system can be easily integrated on the display panel.     

基于时间域读出的大动态范围CMOS图像传感器

设计了一款基于时间域读出的大动态范围CMOS图像传感器。传感器基于一种新型的结构,其可在时间域下探测高输入光强,在模拟域下探测低输入光强。该设计在传统电容反馈式跨阻放大器(CTIA)的基础上,新增了时间域测量电路,在不改变原有积分过程的同时可实现连续的大动态范围。基于0.35μm,5V-CMOS工艺进行了256×1线列CMOS图像传感器流片,光电二极管面积为22.5μm×22.5μm,并对器件的光电特性进行了后仿真验证。仿真测试结果表明,基于时间域读出的图像传感器可实现96dB的大动态范围,且时间域和模拟域的两路输出信号可同步输出,功耗为7.98mW。     

中短波红外图像传感器读出电路研究进展

随着红外技术和探测器性能的进步,中波和短波红外技术在恶劣天气中具有更优秀的成像性能,在民用、军事和航空航天等领域中得到了越来越广泛的应用。读出电路作为连接探测器阵列与后级图像处理电路的关键模块,其性能对中短波红外相机系统性能具有重要影响,决定了最终的成像质量。文章综述了中短波红外图像传感器读出电路的发展现状,分析了读出电路中噪声、动态范围、帧频等问题,重点探讨了针对以上问题的解决方案。最后对读出电路未来设计的改进方向进行了讨论。     

基于被动声信号解算方法的高速目标轨迹测量

声学测量作为新一代外场测量系统的重要组成部分,为实现全天候、全地形下目标的有效轨迹测量起到重要作用。现有外场测量系统多依靠光、雷达等手段对目标进行定位追踪,轨迹测量,但光学轨迹测量精度极易受自然光线的影响,而雷达轨迹测量精度易被复杂电磁环境干扰,无法实现所有时段各类目标的轨迹测量。本文所提出的声学轨迹测量方法,对于超音速目标其测量精度优于10m,对于高亚音速目标测量精度优于10m。声学测量手段的出现弥补了外场观测手段的空缺,极大程度丰富了外场的观测维度。     

DRBR-HDR: Dual-Branch recursive band reconstruction network for HDR with large motions

Ghosting artifacts due to misaligned imaging and missing content of the moving regions are major challenges of synthesizing high dynamic range (HDR) images from multiple low-dynamic range (LDR) with different exposures in dynamic scenes. Therefore, it hopes the HDR reconstruction model can align the LDRs’ features and restore the missing content without artifacts. In the paper, a new dual-branch recursive band reconstruction network for high dynamic range (DRBR-HDR) is proposed to generate credible result in missing content regions, which not only uses global features as supplementary information to help local features from different receptive fields for efficient feature alignment but also designs a series of coarse-to-fine band representation to better repair missing areas in the process of recursion. In addition, we introduce an interactive attention mechanism for local branches to alleviate ghosting artifacts. The experimental results demonstrate that DRBR-HDR achieves state-of-the-art performance compared with that of the prevailing HDR reconstruction methods in various challenging scenes.Index Terms—inverse tone mapping, band reconstruction, global features, high dynamic range images.     

变母线电压工况下开绕组PMSM单矢量模型预测转矩优化控制

为改善双电源供电型开绕组永磁同步电机(permanent magnet synchronous machine,PMSM)在采用传统单矢量MPTC控制策略时转矩脉动大、计算复杂度高、权重系数较难整定的问题,该文提出一种基于电压矢量幅值的最优矢量快速选取方法,利用无差拍预测转矩控制思想,直接预测出参考电压矢量,消除评价函数中的权重系数,分析变母线电压工况下的基本电压矢量变化趋势,结合扇区细分的思想,对不同电压比例下的矢量选取方法进行分析推导,充分考虑了双电源供电型开绕组PMSM拓扑的所有基本电压矢量,采用类似开关表的方法建立了不同扇区内的最优矢量选取方法,降低算法的计算复杂度,有效改善了电机的转矩脉动。实验结果表明,该文提出的单矢量模型预测转矩控制策略在宽母线电压比例范围内均能获得较好的电机控制效果。