共查询到20条相似文献,搜索用时 125 毫秒
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采用传统设备结合虚拟仪器的方法,研制了一套宽可调谐取样光栅DBR(SampledGratingDBR,SG-DBR)激光器的波长测试控制系统。系统能自动向SG-DBR激光器提供电流扫描,同时对激光器输出的光谱数据进行采集、处理,生成SG-DBR激光器的“波长-电流”数据查询表;通过快速查找数据查询表数据,并对激光器提供相应驱动电流,准确控制SG-DBR激光器输出波长。系统数据处理采用了一种新颖的算法,利用输出光边模抑制比(SMSR)来筛选激光器模式稳定工作点,确保数据查询表中的工作点数据均不会发生模式跳变。实验证明,本系统稳定、可靠,波长控制精度高,波长控制误差不超过±0.02nm。 相似文献
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卫星天线测试摇摆台系统能够代替车辆,模拟动中通卫星天线在车上的安装情况,在不同工况下行驶的状态,来对卫星天线进行测试。 相似文献
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本文对安装于非固定平台上红外前视设备的像移产生的机理进行了详细分析,在此基础上提出了采用微机械加速度传感器获取像移矢量的方法及算法,并研制了可安装于红外前视设备上的像移矢量测量系统,利用三维摇摆台进行了像移测量和稳像试验,并与纯软件化稳像效果进行了比较,验证了本文提出的理论和方法的正确性,以及试验装置的有效性. 相似文献
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基于阶跃温度响应的热电偶时间常数测试系统 总被引:1,自引:0,他引:1
为了更方便地测试热电偶时间常数,设计了一套热电偶时间常数测试系统,包括工控机、信号调理电路、A/D采集、数据采集处理软件和打印机等。根据热电偶对阶跃温度的响应,提出了一种全新的热电偶时间常数测试方法,设计功能完善的信号调理电路,通过PCL818L数据采集卡将采集的数据送交上位机应用软件进行分析处理,得到所需要的热电偶参数,应用软件提供各类报表输出及数据打印功能。 相似文献
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Distributed data fusion algorithms for inertial network systems 总被引:1,自引:0,他引:1
New approaches to the development of data fusion algorithms for inertial network systems are described. The aim of this development is to increase the accuracy of estimates of inertial state vectors in all the network nodes, including the navigation states, and also to improve the fault tolerance of inertial network systems. An analysis of distributed inertial sensing models is presented and new distributed data fusion algorithms are developed for inertial network systems. The distributed data fusion algorithm comprises two steps: inertial measurement fusion and state fusion. The inertial measurement fusion allows each node to assimilate all the inertial measurements from an inertial network system, which can improve the performance of inertial sensor failure detection and isolation algorithms by providing more information. The state fusion further increases the accuracy and enhances the integrity of the local inertial states and navigation state estimates. The simulation results show that the two-step fusion procedure overcomes the disadvantages of traditional inertial sensor alignment procedures. The slave inertial nodes can be accurately aligned to the master node. 相似文献
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捷联惯性导航系统误差参数标定的准确程度对于系统的导航和定位精度具有重要影响.针对常规速率标定法不能辩识陀螺零偏,未充分预热时光纤陀螺的误差标定易受温度变化影响这两个问题,提出了一种用于光纤陀螺捷联惯性导航系统的新标定算法--自适应递推最小二乘法(ARLS).在建立光纤陀螺误差及其补偿模型的基础上,通过大量温度实验研究了自适应遗忘因子的求取方法,详细推导了ARLS算法及其实现思路.最后通过算法仿真和速率试验证明了在器件特性不稳定条件下,ARLS算法能有效辨识陀螺的误差参数及减小温度变化对光纤陀螺误差标定的影响. 相似文献
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针对采用轨道贴片法测量冲击速度时,操作繁琐、误差大且不可实时显示速度等缺点,研制了一套车辆冲击试验速度测量装置。装置以MCS-51单片机为核心,通过测量冲击车辆驶过冲击点前固定间距的时间计算冲击速度,且可实现冲击速度值的实时显示与无线传输。经实验室速度标定试验,结果表明速度测量装置具有较高精度,可为车辆冲击试验提供一种较准确的速度测量方法。 相似文献
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为满足惯导组件的多种信号输出测量需求,设计一种基于SOPC的惯导组件多模式测量系统。该系统以FPGA和ISP1581USB为核心,既能对两个惯导组件输出的24路脉冲信号每5 ms进行一次无缝计数,也能对4个惯导组件输出的4路串口数据每10ms进行一次采集。USB总线把采集的数据上传到PC机,进行实时地处理、保存和显示,以此来满足测量的要求。与传统测量设备相比,该设计具有较高的可靠性和稳定性,提高了测量效率,降低了成本。 相似文献
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针对惯性器件全量程气压灵敏度校准难题,发明了一种可抗高离心加速度的气压箱结构,并研制了离心-气压复合校准装置,实现了大g值条件下惯性器件气压特性的校准。本装置设计了两种工作模式:离心机静止时,利用真空泵、高精度压力传感器等气压精密测控系统实现离心-气压复合校准装置的精密控压;离心机工作时,通过密封技术等实现离心-气压复合校准装置保压。本装置通过对安装在离心机上的试验箱内气压进行精密控制,将高线加速度与气压环境有机结合在一起,为加速度计提供可靠的加速度、气压复合计量校准环境。实验结果验证了所设计的气压箱结构可以实现气压范围1~100 kPa,气压偏差优于10 Pa的精密控制。 相似文献
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The characteristic features are indicated of a device for measuring absolute acceleration in inertial navigation systems. 相似文献
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Transfer alignment is used to initialize SINS (Strapdown Inertial Navigation System) in motion. Lever-arm effect compensation is studied existing in an AUV (Autonomous Underwater Vehicle) before launched from the mother ship. The AUV is equipped with SINS, Doppler Velocity Log, depth sensor and other navigation sensors. The lever arm will cause large error on the transfer alignment between master inertial navigation system and slave inertial navigation system, especially in big ship situations. This paper presents a novel method that can effectively estimate and compensate the flexural lever arm between the main inertial navigation system mounted on the mother ship and the slave inertial navigation system equipped on the AUV. The nonlinear measurement equation of angular rate is derived based on three successive rotations of the body frame of the master inertial navigation system. Nonlinear filter is utilized as the nonlinear estimator for its capability of non-linear approximation. Observability analysis was conducted on the SINS state vector based on singular value decomposition method. State equation of SINS was adopted as the system state equation. Simulation experiments were conducted and results showed that the proposed method can estimate the flexural lever arm more accurately, the precision of transfer alignment was improved and alignment time was shortened accordingly. 相似文献