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LCR—G／D重力仪静电反馈装置转换参数的确定 总被引：1，自引：0，他引：1
装配了静电反馈装置的ＬＣＲ－Ｇ／Ｄ型重力仪是目前世界上观测精度最好的相对重力仪，静电反馈装置的转换参数确定正得正确与否是影响观测精度的重要因素之一。本文在研究了转换参数数学模型及精度的基础上，介绍了它的标定方法和计算方法，并根据ＬＣＲ－Ｇ－７９３、Ｇ－８５４两台仪器的标定结果，分析了转换参数的变化特征及影响标定精度的诸多因素，最后提出了标定和使用转换参数的注意事项。 相似文献
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通过理论分析研究和计算机搜寻得到几种频谱特性优良的高价标定脉冲波形，将其与我国台网广泛使用的阶跃脉冲相比较，可大幅度提高通带短周期段的标定精度，与国外使用的平衡二阶或三阶脉冲比较，具有响主尖波形特征，既可提高通带短周期段标定精度，又不降低通带长周期段精度，此外，具有生成较容易，技术难度适中，便于推广使用等特点。 相似文献
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为提高标定仪器的技术性能和功能，满足台网地震遥测系统分段标定的使用要求，研制了ＢＤ—１型标定信号发生器．该仪器采用比较先进的单板机技术，用数字合成的方法产生标定需要的十八点频正弦波信号． 相似文献
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针对地震仪器分段标定方法以及按分段标定方法设计的标定仪器的不足，设计整机系统一次标定的短周期地地义标定器。新型的地震仪标定器，采用８０３１单片机为ＣＰＵ，程序控制数模转换产生各种标定信号，程控衰减电路实现信号的定量输出，恒流变换电路实现标定信号的恒流输出和地震仪的恒流标定，采用系统标定方法和相应的标定器将提高地震仪器的标定精度。 相似文献
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为了提高地震台上测震仪所用脉冲标定器的技术性能，根据沈阳台多年来对脉冲标定器的不断改进，研制了ＳＹ－１型脉冲标定器，通过在沈阳台、新民台近一年多的试验和使用表明：ＳＹ－１型脉冲标定器技术先进，性能稳定，适合于地震台站的工作环境与条件。 相似文献
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本文讨论了标定电流对标度值测量的影响，并介绍了研制的数字表标度值稳定仪及其使用效果，该仪器标定电流在４－１９ｍＡ范围可手动选定，电流稳定精度小于０．０２ｍＡ，电流升，降的转换时间约３０ｓ，仪器结构紧凑，操作简便，可以满足地磁台工作需要。 相似文献
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统计分析了山西省地震台网观测报告测震震级的现状。发现单台震级偏离台网平均震级较大，讨论了这些值偏大的原因，指出这是原始量规函数的地区差异及系统偏差所致，提出求算适合山西地区高精度量规函数的建议 相似文献
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Worldwide, radiocarbon (14C) wiggle-match dating is increasingly used to produce high-resolution, ‘near-absolute’, chronologies in a range of different contexts, yet the exact properties and limitations of the technique are not well understood. Here we present the results of extensive and systematic simulations that allow the precision limits of wiggle-match dating to be quantified for different time periods. We have also been able to quantify the effect of modeling decisions on possible precision in terms of how many measurements to make, how far apart to space them, and which calibration curve to employ. While recent trends towards large numbers of annually spaced measurements can improve precision, the effect is generally small, except when the dated sequence falls on a plateau in the calibration curve. Finally, we demonstrate that wiggle-matching against an unsmoothed record of atmospheric 14C can provide better precision than wiggle-matching against the smoothed IntCal20 or SHCal20 curves. We argue, however, that until intra-hemispheric variation in 14C is better understood, the hemispheric averages provided by IntCal20 and SHCal20 will be the more appropriate datasets for most wiggle-match applications. 相似文献
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本软件采用Ｆｏｘｐｒｏ２．５新一代数据库管理系统编写，主要用于遥测地震台网的设备管理及常规系统标定参数的计算，并已在１９９５年系统标定中得到了实践检验。 相似文献
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航空电磁系统校准是开展实际测量工作的基础,校准情况直接影响数据处理和解释.传统校准方法通常假设在自由空间中进行,忽略导电大地耦合影响.然而,实际工作中很难找到绝对高阻的校准场地,导电大地对系统校准和观测数据的影响无法忽视.本文以频率域航空电磁系统为例,对导电大地上航电系统校准技术和校准误差改正方法进行研究.我们首先推导了层状导电大地上水平共面和直立共轴线圈系统的校准公式,结果表明导电大地对航电系统校准尤其是水平共面装置的高频信号影响很大.针对校准过程中大地电导率已知的情况,本文采用非线性方程求解技术一次性确定校准线圈位置和Q值;在没有任何辅助信息情况下,也可直接利用实测数据计算校正因子进行迭代求解.测试结果表明该方法快速、准确、有效.考虑到系统相位和增益调整直接影响观测数据,本文提出了航空电磁数据校准误差的改正算法.实测数据误差改正结果表明,导电大地对高频信号影响严重,校准误差改正后的航空电磁数据与实际地质资料更好吻合. 相似文献
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The utilisation of sound backscattered from sediments in suspension, to measure profiles of near-bed particle size and concentration, has been gaining increasing acceptance and usage by sedimentologists and coastal engineers over the past two decades. To obtain the sediment parameters from the backscattered signal requires an inversion to be conducted on the signal and this necessitates a system calibration. The calibration can be carried out by detailed acoustic and electronic measurements, or alternatively by measuring the backscattering from suspensions with known scattering characteristics. Here, we explore the latter approach and describe in some detail the calibration of a triple frequency acoustic backscatter system. The aim is to provide coastal scientists involved in using acoustics as a tool for sediment transport research, with a clear exposition of the calibration process. Suspensions of glass spheres of varying particle size were used as the calibration scatterers. To interpret the signal backscatter from the suspension of glass spheres a simple model for sphere scattering is presented. The results show that consistent calibration results can be obtained in a relatively simple and robust manner. 相似文献
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The use of distributed data for model calibration is becoming more popular in the advent of the availability of spatially distributed observations. Hydrological model calibration has traditionally been carried out using single objective optimisation and only recently has been extended to a multi-objective optimisation domain. By formulating the calibration problem with several objectives, each objective relating to a set of observations, the parameter sets can be constrained more effectively. However, many previous multi-objective calibration studies do not consider individual observations or catchment responses separately, but instead utilises some form of aggregation of objectives. This paper proposes a multi-objective calibration approach that can efficiently handle many objectives using both clustering and preference ordered ranking. The algorithm is applied to calibrate the MIKE SHE distributed hydrologic model and tested on the Karup catchment in Denmark. The results indicate that the preferred solutions selected using the proposed algorithm are good compromise solutions and the parameter values are well defined. Clustering with Kohonen mapping was able to reduce the number of objective functions from 18 to 5. Calibration using the standard deviation of groundwater level residuals enabled us to identify a group of wells that may not be simulated properly, thus highlighting potential problems with the model parameterisation. 相似文献
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氢气具有较强的映震灵敏性,氢气观测是探索地震短临预报的新途径。ATG-6118H痕量氢气在线自动分析仪是一种用于测量地下流体逸出氢气的新型数字化观测仪器,可以现场进行全自动连续测定,具有灵敏度高、自动化程度高、功耗低、操作简单等特点,具有网络远程诊断和数据处理分析功能,可以精确分析空气及井水中逸出的痕量氢背景值。目前我国尚未形成统一的痕量氢分析仪的检测规范,本文根据实际检测要求,对ATG-6118H痕量氢气在线自动分析仪进行了校准实验、检出限实验以及精确度实验,并对8台仪器性能进行了对比。通过指标评价确定了该仪器的性能检测方法的可行性,适合在具备数字化观测条件的全国地震地下流体台站以及具备断层气观测条件的台站推广应用。 相似文献