大视场面阵数字航摄仪检测关键技术探讨

针对常规室内检校场无法满足大视场面阵数字航摄仪检测的问题,文章提出了一种适合此类航摄仪检校的野外检校场的建立方法,通过对检校场控制点布设方案设计、适合影像识别的地标形状设计和地标点三维坐标的精确测定方案研究,实现了检测场内控制点的高精度测量:建立适合大面阵数字航空摄影仪几何误差改正的数学模型,并通过多摄站拍摄足够数量的检校场影像,自动识别并测定每幅影像上全部地标点的影像坐标,用最小二乘平差计算间接求出相机的内方位元素和各项畸变参数,最后通过多组检测参数对比,验证了数学模型及其参数的可靠性与稳定性。     

基于嫦娥二号CCD数据的核线影像生成方法

对于缺少嫦娥二号激光数据问题,本文提出了基于RPC有理多项式系数(Rational Polynomial Coefficient)的嫦娥二号CCD影像的核线影像生成方法.它利用了嫦娥一号激光高度数据与嫦娥二号CCD影像控制点相结合的方法生成月面控制点,通过月面控制点建立正确的校正公式,获得分辨率较高的正射影像图,并在此基础上提取核线影像.     

城市地下管网普查物探方法分析与验证

地下管网是城市正常运转的基础设施,承载着城市各种物质流、能源流和信息流,保证了城市的有序运转和居民的正常生活。探测地下管线的主要设备是英国雷迪RD8000,但这种设备恰巧是测绘仪器检定的盲区。为保证探测精度,需对物探方法进行分析,对设备进行校验,对不同埋深、不同地电条件下金属管线探测的工作参数进行试验,对探测仪性能、方法、最佳收发距离进行综合评定,旨在最大限度地发挥探测仪的潜能,从而保证地下管网的探测精度。     

InFOCμS Hard X-ray Imaging Telescope

InFOCμS is a new generation balloon-borne hard X-ray telescope with focusing optics and spectroscopy. We had a successful 22.5-hour flight from Fort Sumner, NM on September 16,17, 2004. In this paper, we present the performance of the hard X-ray telescope, which consists of a depth-graded platinum/carbon multilayer mirror and a CdZnTe detector. The telescope has an effective area of 49 cm² at 30 keV, an angular resolution of 2.4 arcmin (HPD), and a field of view of 11 arcmin (FWHM) depending on energies. The CdZnTe detector is configured with a 12 × 12 segmented array of detector pixels. The pixels are 2 mm square, and are placed on 2.1 mm centers. An averaged energy resolution is 4.4 keV at 60 keV and its standard deviation is 0.36 keV over 128 pixels. The detector is surrounded by a 3-cm thick CsI anti coincidence shield to reduce background from particles and photons not incident along the mirror focal direction. The inflight background is 2.9 × 10⁻⁴ cts cm⁻² sec⁻¹ keV⁻¹ in the 20–50 keV band.     

CCD photometry of asteroids (58) Concordia, (360) Carlova and (405) Thia

Three selected asteroids, numbered 58, 360 and405, were observed during 2000at Yunnan Observatory, China. Thenew lightcurves are presented inthis paper. The synodic period of (58)Concordia is estimated as 9.90 ± 0.01hfor the first time. The synodic period of (405) Thia derived from ourobservation is 9.96 ± 0.01h, which is slightly different from the previousresult. For 360, we obtained the synodic period of 6.18 ± 0.02h which isconsistent with previous values. Additionally, the BV and UB-colourindexes for the three asteriods were also determined.     

Monte-Carlo Simulations of Cosmic-ray and Internal Radiation Effects on ISOCAM on Board ISO

One of the main limitations to the sensitivity of the infrared camera ISOCAM on-board the Infrared Space Observatory (ISO) comes from responsivity variations and glitches caused by the impacts of charged particles in photo-detectors. Glitch rate measurements, glitch properties and removal methods have already been addressed during the first ISO detector workshop(Madrid, 1998) and published in a special issue of Experimental Astronomy. It appeared that glitch rate and most of glitch properties could be reproduced by Monte-Carlo simulations. This is very interesting in order to predict before launch the effect of charged particles in photo-detectors operated in space. This paper presents results of Monte-Carlo simulations of radiation effects on ISOCAM detectors. Glitch rates, spatial and energetic properties of glitches have been computed and are compared with measured values. This revised version was published online in July 2006 with corrections to the Cover Date.     

带相敏检波器的线性可变差动变压器(LVDT)读出电路的设计

本文简单介绍了LVDT、相敏检波器和三角波发生器的工作原理及自行设计的一种实用的LVDT相敏检波读出电路。     

LC元件参数的数字测量方法与设计

本文着重说明如何将LC元件的諸参数转换为相应的数字量,以适应数字測量的要求。本文采用的方法与设计,具有电路结构简单,易于实现的特点。     

气测录井技术的进展及气测资料新用途的探讨

过去,由于气测录井技术的限制,气测数据被认为是不可靠的,其应用的范围也因此受到了制约。现在,随着气测获取及分析技术所取得的进步,可以得到更为准确的气测数据。为了能充分利用气测资料,通过分析气测数据不同比值的深度曲线图,利用曲线的形态及趋势可以划分岩性界面、划分油气水界面、判断地层流体的渐变、推测盖层的封堵效率、预测石油是否遭受了生物降解以及对不同层位的油源进行初步分析。     

二维CCD图象数据压缩

本文着重指出了在今后处理大面积CCD图象数据过程中,所将面临的数据存贮困难问题.本文提出了一种有效的不丢失天文信息的压缩CCD图象数据的方法,对银纬b=-60°的一个天区的试验表明,压缩后的图象数据仅为原图象数据的1/30左右,并且可以十分方便地进行图象再现及再处理。在压缩数据过程中,我们在剑桥APM底片扫描机参数化施密特照相底片的基础上,重新安排了CCD图象上天体的对应参数,并视天体的大小及形状,有效地提取保存了天体周围矩阵信息.