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基于多极化目标特性测量雷达的设计,结合实际应用,给出了多极化目标特性测量雷达跟踪接收机的设计与工程实现,并对影响跟踪精度的因素进行了分析。 相似文献
3.
Fault-accommodation with intelligent sensors 总被引:1,自引:0,他引:1
Giacomo Tortora Author Vitae Author Vitae David Clarke Author Vitae 《Automatica》2003,39(7):1227-1233
Optimal sensor fault-accommodation is considered for faults modelled by an increase in measurement noise. This noise is taken to be bounded and its probabilistic properties unknown. It is assumed that intelligent (e.g. self-validating) instrumentation is in use and estimates of the noise bounds are available. The fault-tolerant controller is designed to optimize a noise rejection and a nominal reference tracking index and leads to a mixed norm minimization problem (l1/l2). We exploit known results and a particular feedback configuration to show that it is possible to optimize simultaneously without a trade-off the two performance indices. The results are applied to systems where the presence of auxiliary measurements allows for an optimal fault-accommodation strategy. Using properties of the optimal solution, we define a factorization for the optimal controller alternative to the Youla parametrization, leading to an algorithm which is optimal, transparent and efficient. 相似文献
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自控温电伴热材料在仪表测量管线上的应用 总被引:2,自引:0,他引:2
文章就化工自动化仪表测量管线的伴热问题,介绍了自控温电伴热材料的特点、伴热设计、施工方案以及运行中的注意事项。 相似文献
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James L. Gardner 《Color research and application》2006,31(5):374-380
The spectral bandwidth formulae of Stearns and Stearns are generalized for an arbitrary slit function. Correction coefficients are derived in terms of moments of the slit function. Application to model LED spectra measured with a compact, fiber‐coupled spectrometer having bandwidth of order 12 nm, and a nonlinear wavelength scale shows that accurate LED color measurements may be obtained with such an instrument. Fitting of the relatively broad slit function to line spectra for accurate wavelength calibration is also described. Such fitting, coupled consistently with the bandpass correction, improves the accuracy color measurements with a broad‐response spectrometer. © 2006 Wiley Periodicals, Inc. Col Res Appl, 31, 374–380, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/col.20242 相似文献
6.
James Rodgers Kaye Wolf Norm Willis Don Hamilton Ralph Ledbetter Curtis Stewart 《Color research and application》1994,19(5):322-331
A multiplant Quality Improvement Team [QIT] was firmed to develop and implement an evaluation program for various color measurement .systems as potential replacements for the then-current aging systems. The emphasis qf this article is the analytical methodology utilized to evaluate the various color systems. The evaluation program consisted cf two phases. Phase I was a general overview/review of several systems, while Phase II was an extensive internal comparative evaluation measurement systems. These were Milton-Roy's ColorMate HDS, HunterLab's Ultrascan, Datacolor's CS-5, and BYK-Gardner's The Color Sphere [TCS]. The main comparison criteria were interinstrument agreement [agreement between two instruments ofthe same system], user-friendly software and computer interface capability, vendor amenability to a long-term logistical and maintenance relationship, and price. All systems were evaluated by duplicate measurements on various color tiles, yarns, and polymer flakes-over 1600 measurements on each system. The systems were compared with an instrument matrix, a decision matrix, and a product matrix. The instrument matrix was a comparison qfinstrument parameters, software/math treatments, and economics. The decision matrix was a forced ranking of each system by each criteria category [1–4 scale, with 1 representing the best and 4 representing the worst]. The product matrix accentuated the relative importance ofone criterion category over another by multiplying the forced ranking by the criticality of the category. The criticality of a given category wus determined by consensus within the QIT. Thr combination qf the three matrices allowed the evaluator[.s] t o select the color rneasuremmt system that best satixfied the color measurement needs and requirements of their facility and their products. For this evaluation, all ofthe evaluated systems were superior to the then-current agingsystems. As a result of this methodology, one instrument emerged as clearly superior. © 1994 John Wrley & Sons, Inc. 相似文献
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缓冲区溢出是C程序中众多安全隐患的根源之一,以C程序代码为目标对象,提出了一个基于底层虚拟机中间代码的缓冲区溢出检测工具PathChecker.该工具基于动态符号执行方法,使用无量词谓词公式刻画缓冲区操作的安全性质,并利用可满足模型理论求解器技术检验缓冲区操作的安全性.实验结果表明,该工具能有效检测C代码中的缓冲区溢出漏洞,且易于推广至其他高级程序语言代码和其他类型安全漏洞的检测. 相似文献
8.
存储测试非常适合于旋转轴扭矩测试,但是存储测试需事后回收处理,无法现场观测数据,且参数设置固定。针对上述问题,结合履带式车辆传动轴扭矩测试情况,以存储测试为基础结合Zigbee无线技术,设计了基于LabVIEW上位机控制的无线存储测试系统,利用Zigbee无线网络实现无线触发和多次重触发,并回传测试开始后的少量数据,根据回传数据调整测试单元的参数。实验结果表明该测试系统存储测试与无线技术能有效结合,充分发挥各自的技术优势,提高了测试效率和数据的可靠性,具有良好的应用前景。 相似文献
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浅析X荧光成份分析仪在水泥生产过程中的应用 总被引:1,自引:1,他引:0
阐述了X荧光成份分析仪在水泥生产过程运行的现状及其测量原理,结合现代新型干法大规模生产线对产品质量的控制要求,对X荧光成份分析仪在水泥生产过程应用的必要性进行了说明。 相似文献