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针对高机动三坐标雷达系统车的力学性能进行分析研究,介绍了雷达系统车的组成,分析了系统的力学边界条件,提出了系统优化的目标;对天线车系统结构布局、力学性能进行分析和优化,并对分析结果进行验证测试.通过仿真优化分析结果与测试数据的对比,提出了该雷达系统车的结构设计方案和改进建议. 相似文献
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天线作为辐射和接收雷达电磁波的主体,要求有相当高的阵面精度、刚度和强度。本文分析了机动型雷达平面阵列天线结构设计的特点,结合某机动雷达天线系统的设计,着重介绍了在该类天线设计中如何解决机动性与有限空间尺寸,空间与刚度,刚度与重量,高精度与可分解性等诸多矛盾,指出恰当处理这些问题是该类天线设计成功的关键所在。 相似文献
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天线作为辐射和接收雷达电磁波的主体,要求有相当高的阵面精度、刚度和强度。本文分析了机动型雷达平面阵列天线结构设计的特点,结合某机动雷达天线系统的设计,着重介绍了在该类天线设计中如何解决机动性与有限空间尺寸,空间与刚度,刚度与重量,高精度与可分解性等诸多矛盾,指出恰当处理这些问题是该类天线设计成功的关键所在。 相似文献
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机动重载天线平台调平精度的分析与实现 总被引:1,自引:1,他引:0
当机动三坐标雷达天线载荷超过一定重埴,运转天线时会引起天线车平台的复杂形变,从而导致天线无法满足三坐标雷达要求的动态水平精度指标.该文用ANSYS有限元软件及I-DEAS软件研究分析天线车平台变形情况,并分析影响天线车平台调平精度的因素,提出用半挂车作为天线车平台,采用主调平支撑腿结合辅助支撑腿支撑天线车平台的方法,可以改善重载三坐标天线运转时的天线变形恶劣的情况,从而满足了相关的技战术指标. 相似文献
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伺服调平系统是相控阵雷达的重要配套设备,按照雷达系统的工作过程,实现雷达天线车的自动调平和撑腿收回。本文介绍一种基于倾角传感器的伺服调平系统,将天线车的倾角值作为自动调平和撑腿收回的依据,可靠性高,降低了伺服调平系统虚腿和单腿承载过重的风险。 相似文献
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The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde. 相似文献
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By means of exact conformal mapping method we have defined character of dependence of squares amounts of angular part of film
element on angled part dimension. We propose relations, approximating obtained dependence. Calculation results and experimental
researches of large-scale models are represented. 相似文献
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解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1968,56(6):1024-1032
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature. 相似文献
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Moshrefzadeh R.S. Radcliffe M.D. Lee T.C. Mohapatra S.K. 《Lightwave Technology, Journal of》1992,10(4):420-425
The temperature dependence of refractive index of polymer films was determined for a number of slab waveguides by a grating coupling method. This dependence was examined as a function of parameters such as molecular weight and glass transition temperature of the polymer. Temperature-induced changes in N TE-N TM , N being the effective index, were studied systematically for different slab waveguide compositions. It is shown that with proper device design and choice of polymeric materials, thermal effects can be reduced 相似文献
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The approaches to prepare a uniform and unified scientific terminology of chemical carcinogenesis are presented. The main definitions proposed (carcinogen, initiation, promotion, mutagen, multistage carcinogenesis, anti-carcinogen, cocarcinogen, carcinogenic risk, etc.) are based on the current state of comprehending mechanisms of the action of chemical carcinogens. 相似文献
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上市公司为了增强市场竞争力,不断扩大生产规模,追求规模经济,但是由于我国较低生产力水平、政府干预、体制等原因,上市公司的规模经济效果并不明显。同时,20世纪90年代以来,科学技术的日益发展,改变了企业发展的外部环境和条件,使得规模经济的实现方式发生了新的变化。在信息化时代下,规模经济理论需要进一步创新和拓展,企业按照新形势来选择合适的经济规模。 相似文献