共查询到19条相似文献,搜索用时 109 毫秒
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本文提出了几种通过软件算法来减小测距误差的方法,并对其可行性和实现方案进行了分析研究。这些减小测距误差的方法均通过了实验验证,有的已应用于工程,取得了较好的效果。 相似文献
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本文用统计的方法对多套相控阵天线的试验结果进行分析.根据测试数据.对本相控阵天线指向精度误差产生的原因做出分析.指出了相控阵天线指向精度随机误差产生的主要原因是生产和装配带来的.系统误差主要来自天线单元方向图影响的结论。 相似文献
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靶场测控装备的管控与状态预测对于确保靶场试验任务的顺利开展有着重要的意义,也是状态/故障处理研究领域的发展方向。结合装备结构关系网络,通过对状态信号的分析,给出了靶场测控设备单元的状态预测方法。依据电子元器件寿命规律,结合状态异常出现的分布函数,重点构建了离散型状态变量的预测模型,提出了相应的预测流程和方法。仿真计算表明,提出的状态及故障预测模型和方法有效,可为提高任务期间装备的可靠性提供判断依据。 相似文献
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ZHAO Ruibin LI Rui HUANG Zhigang SHAO Bo 《电子学报:英文版》2014,(1):194-198
An Analytic estimation method (AEM) which has less execution time is proposed to calculate the User range accuracy (URA) used by the user to detect the integrity potential risk. It shows that the most important thing of computing URA is to find the maximum error vector in the error vector space. By using the covariance matrix of the error vector, the searching of the maximum error vector is converted to an analytic geometry problem. The value of the maximum error vector can be obtained di- rectly by mathematical derivation. Experiments are made to compare the performance between the proposed AEM algorithm and the Exhaustive grid search (EGS) method. The related results show that the AEM algorithm can re- duce more than 92% of execution time. This algorithm is more suitable for computing URA at the Master control station (MCS) for the engineering applications. 相似文献
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The paper deals with instruments for radio-noise measurements according to the CISPR recommendations; however, the ideas described can be applied also in non-CISPR-type meters. A limited instantaneous dynamic measurement range is a common drawback of the classic CISPR (and non-CISPR) meters currently used. One of the most important factors limiting this range is a nonlinearity of the measuring channel. The paper describes two new methods of improving the channel linearity and extending its dynamic measurement range. The first of them is based on application of a precision quasi-peak detector, whereas the second method is founded on splitting the measured signal into several separate subehannels, and synthesing the resulting output. A simplified theory is outlined, and experimental results are presented. The precision quasi-peak detector application results in a linear input-output relation, whereas the signal-splitting/synthesizing technique makes this relation logarithmic. An increase of dynamic range by 20 to 40 dB has been demonstrated practically in experimental models built. 相似文献
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动态范围是比幅测向设备一项重要指标,在分析了比幅测向设备测向误差来源和机理基础上,针对目前常用的比幅测向动态范围定义和测试方法在检验样本设计上不尽合理之处,提出了符合简单随机抽样条件的比幅测向动态范围定义和测试方法,对比幅测向设备动态范围设计、分析、测试具有一定指导作用。 相似文献
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红外辐射特性是武器装备的一项重要指标。目前,通过理论计算对其进行设计,并基于风洞进行静态试验,最后通过外场实际动态试验进行验证。与设计及风洞试验相比,外场试验具有很多复杂因素,因此对外场设备的精度进行检验是十分必要的。阐述了在外场对红外辐射测量标定精度进行验证的方法流程,并给出了实际测量结果。 相似文献
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设计、仿真并制作了基于认知无线电的零中频射频接收机。该接收机工作于698-806MHz频段,采用三级数控衰减器和高线性、高增益低噪声放大器获得了70dB的动态范围和-81dBm的灵敏度,全平衡I/Q解调器和差分输入的本振源减小了二阶失真和本振泄漏的负面影响。为了在工作频段的14个连续信道中准确选取所需信道,文章提出了一种信道选择电路结构。测试结果显示,整个频带内的噪声系数(NF)为3.4dB,在输入信号为-81dBm时,系统的误差矢量幅度(EVM)为7.5%。 相似文献