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Since 2014 NIM has also started to design and develop one kind of homemade calibration system for the time link calibration on the basis of NIMTFGNSS-2 receiver. The system has been constructed preliminarily and calibrated, and in the near future, with this calibrator we might implement the calibration campaigns of some TAI links under the APMP(Asia Pacific Metrology Programme) scheme.
The techniques of GPS time and frequency transfer (code based and carrier phase) and TWSTFT are widely used in remote clock comparison and in the computation of TAI and UTC. Many timing laboratories in the world utilize both techniques (GPS and TWSTFT transfer links) to compare each other's clocks. A time link must be calibrated to assure the time transfer accuracy. In many cases, calibration campaigns...
This paper gives a test method of BeiDou timing receiver delay. A BeiDou System simulator and a time interval counter were used in the experiments. During the process, the most important step is to calibrate the delay of the simulator. The uncertainty of this method is analyzed to be less than 1.5ns. Using this method, some typical Chinese commercial timing receivers were tested, and the results are...
Since 2010 ROA has supported the coordination of the EURAMET Technical Committee for Time and Frequency (TC-TF) Project 1156, a response from EURAMET TC-TF to Recommendation 2 of CCTF 2009: to study the characterization of GNSS equipment in use for establishing the time links between institutes contributing with their clocks to TAI. Starting that year, a GPS calibration campaign was organized between...
In almost all the studies, the differential receiver calibration and the link calibration had been discussed separately as if the two calibrations were completely independent. In fact, in the sense of the total delay for UTC time transfer, the difference between the receiver and link calibrations is not how to perform the calibration measurement but how to use the measurement data. The two calibration...
In this paper, a method that is capable of handling simultaneously gain, phase and location as well as mutual coupling uncertainties is proposed for calibrating a planar array of general geometry. The proposed technique assumes that the array gain and phase errors are non-directional and that three time-disjoint pilot sources are available. The efficiency and the potential benefits of the proposed...
This paper reports that uncertainty of detected edges on a fish-eye image depends on the direction to observe the edges. In fish-eye cameras, dimensions of observation space corresponding to a pixel greatly change with the pixel location. This dimension is defined as “spatial uncertainty” in this paper and formulated with typical projection models of fish-eye cameras. Experimental results showed that...
The test suite specification (TSS) provides organizations that are testing phasor measurement unit (PMU) performance with a suite of unambiguous test plans. For Corporate or Institutional Access, request a custom quote for your organization at www.ieee.org/go/synchrophasor-subscriptions.
This paper describes an extensible framework for real-time self-calibration of cameras in the simultaneous mapping and localization (SLAM) setting. The system is demonstrated to calibrate both pinhole and fish-eye camera models from unknown initial parameters while seamlessly solving the maximum likelihood online SLAM problem in real-time. Self-calibration is performed by tracking image features,...
This paper presents a procedure for calibrating a Vector Network Analyzer (VNA) calibration kit, mechanical short, open, and load or electronic calibration unit, as a black box. The uncertainty is associated with each connector type in the calibration kit in the form of an uncertainty two-port. The method is validated by comparing results using different VNA test set configurations as well as a comparison...
Electronic weighing instruments consist of a load receptor, an electromechanical converter, an electronic processing unit, a display and an interface. The object of the calibration is the indication provided by the instrument in response to an applied load. The results are expressed in units of mass. When is not possible to use only standard weights, the substitution loads may be used. With each substitution...
The aim of this paper is to achieve an evaluation of the measurement uncertainty in electrostatic discharge immunity tests, in order to improve their repeatability. We described the main stages of budget uncertainty implementation and then we prepared a budget uncertainty, taking into account the error sources. Finally, we calculated the combined uncertainty and the expanded uncertainty for the current...
This paper provides an overview of the comparison tests on two current shunts performed on March 2012 in ICMET Craiova as well as the consequences of this comparison for the demonstration of the traceability of the calibrations carried out by the ICMET Calibration Laboratory “C.L. - High Currents”, and other issues about the measurement uncertainties. The two current shunts which underwent the comparison...
The physical process modeling of an estuary is a complex mechanism that comes along with the existence of uncertainty. In contrast, due to significant variability of flows in space and time, an extensive modeling effort must be accommodated with the application of parallelization technology. Therefore, the implication of estuary model parallelization to the model result uncertainty must be examined...
In the passive localization, the estimate error of sensor position and velocity is inevitable. By the use of the calibration, the sensor position and velocity will be improved, especially, to the Cramer-Rao lower bound (CRLB) under the ideal circumstance. The CRLB for the estimate of sensor position and velocity is derived at beginning. Then the CRLB for the estimate of source is followed. Finally,...
Generally, there are many of the error evaluation methods which employed for the length measurement system. The reversal error is one of the important sources of the error. Normally, it is compensated by using the linear error compensation but some residual error is found for measurement uncertainty evaluation. This paper presents a method which is a new design of an automated line scale measuring...
The paper deals with magnetic field measurement, carried out by using a broadband and isotropic instrument. These measurements are characterized by a very high uncertainty values if compared with the ones usually related to other electrical measurements. For these reasons, if the measurements are performed to assess the exposure of human beings, these large uncertainty values imply a high risk of...
It has been shown that ATE systems which are targeted at families of products can have a significant positive impact on the cost of test and capacity availability. In addition it has been shown that the quality (accuracy and repeatability) of the test system reduces the overall cost of test and rework. The historical challenge has been that test systems are traditionally targeted at an individual...
An uncertainty calculation method for the D-band power meter calibration factor is reported. In this method, the propagation of uncertainty from type-B uncertainty components is calculated using the Monte Carlo method. Then, the combined standard uncertainty is calculated as the square root sum of the uncertainty propagation and waveguide flange connection repeatability.
A compact quasioptical setup is designed and optimized for material characterization in the frequency range 50 GHz to 500 GHz. The S-parameters are measured with a commercial Vector Network Analyzer (VNA) together with its mm/sub-mm frequency extenders. A simple practical calibration process is used to determine the diffracted waves on the material surface. A new method is proposed to extract the...
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