![]() For the planar surface the achieved improvement was of around 200 μm. Three surfaces were used for this evaluation: plane, turbine blade and engine cover. The efficiency of the proposed algorithm was evaluated by comparison with data from a coordinate measuring machine (CMM). Transformation enabling displacement of characteristic points from optical measurement to their match from contact measurements is determined and applied to the whole point cloud. ![]() In each pair the coordinates of the point from contact measurements is treated as a reference for the corresponding point from non-contact measurement. In the proposed method the concept of virtual markers is used to find a representation of pairs of corresponding characteristic points in both sets of data. In this paper a method for fusion of data from two measurements of fundamentally different nature: high density low accuracy (HDLA) and low density high accuracy (LDHA) is presented to overcome the limitations of both measuring methods. Thus the drawback of contact methods is low density of data, while for non-contact methods it is low accuracy. On the other hand optical methods gather high density data of the whole object in a short time but with accuracy at least one order of magnitude lower than for contact measurements. Contact measurements are characterized by low density and high accuracy. R.Ĭoordinate measuring techniques rely on computer processing of coordinate values of points gathered from physical surfaces using contact or non-contact methods. Rak, Michal Bartosz Wozniak, Adam Mayer, J. The use of low density high accuracy (LDHA) data for correction of high density low accuracy (HDLA) point cloud Some improvements to the LITTON Auto-Surveyor System II are suggested which would improve the accuracies even further. On missions over 750 m ( 8 stations, 25 minutes duration, 3.5 minute ZUPT intervals, mean offset distances 9 metres) accuracies of 37 mm (one sigma) in position and 8 mm in elevation were achieved. An offsetting system based on a Hewlett-Packard HP 3820A electronic tacheometer has been tested in Sydney (Australia) in connection with a vehicle mounted LITTON Auto-Surveyor System II. The loss in accuracy caused by the coordinate transfer between IMU and ground marks is investigated and an offsetting system based on electronic tacheometers is proposed. The accuracy requirements of urban surveys are usually high. Today, a new type of ISS application is emanating from an increased need for survey control densification in urban areas often in connection with land information systems or cadastral surveys. Traditionally Inertial Surveying Systems ( ISS) are used for missions of 30 km to 100 km length. Given this need, new model high accuracy calibration techniques for bipolar junction transis- tors have been developed and are described in this report.« less Thus, models that meet these stipulations also enable the calculation of quantifi- cation of margins with respect to a functional threshold and uncertainties in these margins. Since these accurate models have low error in transistor descriptions, these models can be used to describe part to part variations as well as an accurate description of a single circuit instance. In contrast, circuits that have very stringent accuracy requirementsmore » require modeling techniques with higher accuracy. The use of these types of models describes expected performances considering the extremes of process or transistor deviations. Correspond- ingly, when using this approach, high degrees of accuracy of the transistor models are not expected since the set of models is a surrogate for a statistical description of the devices. These models consists of differing parameter values that describe the location and the upper and lower limits of a distribution of some transistor characteristic such as current capacity. Typically, transistors are modeled by the application of calibrated nominal and range models. ![]() High Accuracy Transistor Compact Model Calibrations ![]()
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