基于高精度POS航测相机影像快速生产体系的建立

ADS 40作为徕卡新的传感器,目前国内用于大规模航拍的不多。由于携带高精度POS系统,外业工作量大大减少,但同时,内业处理难度也有所增加。国内尚没有成熟的生产体系可供参考,建立起基于高精度POS系统的数字摄影测量快速生产体系至关重要。     

ADS40生产过程及精度研究

本文针对ADS40在1∶10000、1∶2000、1∶500地形图测绘工作中的问题进行了研究和探讨,重点针对ADS40应用中坐标系的定制及转换方法、大地水准面精化成果应用等进行了相关研究。实验证明,该设备在不同比例尺的摄影过程中获得的IMU/GPS数据精度相当,IMU/GPS解算数据与飞行比例尺无关;有地面基站和精密单点定位技术解算精度相当,适用于现行各种比例尺的成图需求。空三解算针对不同比例尺采用无野外控制点或少量野外控制点的方法,较大减轻了野外测量工作量;生产整体流程中,采用整航带作业模式,减少了图幅拼接、DOM生成等的工作量,较传统框幅式作业方法有较大的优势。     

Speckle observations with PISCO in Merate: VIII. Astrometric measurements of visual binaries in 2007 and new orbits of the multiple system Zeta Aqr

We present relative astrometric measurements of visual binaries made during the second semester of 2007, with the speckle camera PISCO at the 102 cm Zeiss telescope of Brera Astronomical Observatory, in Merate. Our sample contains orbital couples as well as binaries whose motion is still uncertain. We obtained 283 new measurements of 279 objects, with angular separations in the range 0″.17–4″.4, and an average accuracy of 0″.014. The mean error on the position angles is 0°.6. Most of the position angles were determined without the usual 180° ambiguity with the application of triple‐correlation techniques and/or by inspection of the long integration files. We also present the new orbit we have computed for Zeta Aqr AB (ADS 15971), for which our measurements lead to large residuals with the previously computed orbit. We were also able to compute the elements of the perturbation orbit Bb‐P caused by an invisible companion, whose mass is estimated at 0.7 M_⊙ (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Speckle observations with PISCO in Merate (Italy): XIV. Astrometric measurements of visual binaries in 2013 and new orbits for ADS 1097, 5871, 7203, 7775, 9378, 9578, and 11186

We present relative astrometric measurements of visual binaries made in 2013 with the speckle camera PISCO at the 102‐cm Zeiss telescope of Brera Astronomical Observatory, in Merate. Our observing list contains orbital couples as well as binaries whose motion is still uncertain. We obtained 134 new measurements of 129 visual binary stars, with angular separations in the range 0.≈23–5 and an average accuracy of 0.≈01. The mean error on the position angles is 0.°5. Most of the position angles were determined without the usual 180° ambiguity with the application of triple‐correlation techniques and/or by inspection of the long integration files. We also present new revised orbits for ADS 1097, 5871, 7203, 7775, 9378, 9578, and 11186, partly derived from PISCO observations. The corresponding estimated values for the masses of those systems are compatible with the spectral types. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

基于LPC2478的三相电力监测仪

介绍了国家智能电网需求的一款新型三相电力监测仪.该仪器采用LPC2478ARM处理器且外扩8通道同步采样ADC,标配RS485接口,主要参数测试精度优于0.2级,且通过了江苏省电力科学研究院的测试认证,整体测试性能达到国标A级.     

ADS40线阵影像空中三角测量数据处理与精度分析方法

讨论了线阵影像空三数据处理中的自动连接点匹配、粗差剔除、方差分量估计、GPS/IMU观测值权值设置、坐标转换等问题,归纳了ADS40空三精度分析方法及相应技术指标。通过实际生产项目对机载线阵影像的空三精度进行了分析,获得了满意的空三精度。     

利用ADS100影像进行航空摄影测量的实践

以"葫芦岛测区基础测绘项目"为例,阐述了ADS100数字航空摄影测量系统在空中三角测量、DEM制作、DOM制作和立体测图等生产过程中的应用,并通过精度统计验证了该方法的可行性,实践证明:ADS100数字航空摄影测量系统在投入实际生产中,能确保航摄质量、提高航摄效率、保证数据处理精度。     

基于PHOTOMOD6的ADS80 L1级影像DOM制作方法及精度评价

PHOTOMOD是俄罗斯Racurs公司生产的全数字摄影测量系统,本文介绍了基于PHOTOMOD软件利用ADS 80 L1级影像制作DOM的方法及发现的问题,并以试验测区的成果DLG和DOM为基准,评价了软件制作DOM的精度。总体上,在与成果DLG的套合检查中,分别将成果DLG中的房屋、地类界和等高线三类要素叠加在本文生成的DOM上,结果表明二者的套合情况较好;在与成果DOM的精度对比中,本文选取的253个检测点在x方向和y方向的平面中误差分别为0.96 m和1.25 m,总的平面中误差为1.58 m,可满足国家规范中DOM的精度要求。本文的试验和研究对正射影像生产具有一定的参考价值和借鉴意义。     

ADS40相机用于海岛(礁)大比例尺成图的试验

本文利用ADS40相机进行航空摄影,对海岛(礁)区域1∶2000比例尺成图精度进行了分析,比较了差分GPS与精密单点定位技术应用于ADS40航摄的精度。试验结果表明,ADS40相机可满足海岛(礁)大比例尺成图航摄的精度要求,缩短成图周期,精密单点定位技术的平面精度与差分GPS方法相当,高程精度较差,从工程角度考虑,海岛(礁)大比例尺成图时架设地面GPS基站比较稳妥。     

利用双高度层ADS40影像实现无控制点高精度定位

ADS40是一款目前广泛应用的三线阵机载数字航测相机,集成了高精度的POS系统,大大降低了对地面控制点的依赖。尽管在无控制点时,利用ADS40影像进行空中三角测量的精度已经相对较高,但仍然难以满足大比例尺、高精度测图;常规的方法是引入少量控制点,利用自检校光束法区域网平差来提高ADS40定位精度。本文将结合ADS40相机的特点,利用双高度层的ADS40影像实现完全不依赖控制点的高精度定位。