Digital Processing Method used to Improve the Frequency Measurement Accuracy for Vibrating-Wire Transducers

2019 ◽  
Author(s):  
S. Pop ◽  
V. Bande
Keyword(s):  
Measurement Accuracy ◽  
Digital Processing ◽  
Frequency Measurement ◽  
Processing Method ◽  
Vibrating Wire

scholarly journals Erratum: Corrigendum: High-Resolution Group Quantization Phase Processing Method in Radio Frequency Measurement Range

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Baoqiang Du ◽  
Dazheng Feng ◽  
Yaohua Tang ◽  
Xin Geng ◽  
Duo Zhang ◽  
...  
Keyword(s):  
High Resolution ◽  
Radio Frequency ◽  
Frequency Measurement ◽  
Measurement Range ◽  
Processing Method ◽  
Group Quantization

Error Analysis and Improvement of Equal Precision Frequency Measurement

2014 ◽  
Vol 687-691 ◽  
pp. 841-846 ◽  
Author(s):  
Rong Xiang Wang ◽  
Xia Zhang
Keyword(s):  
Error Analysis ◽  
Measurement System ◽  
Measurement Accuracy ◽  
Frequency Measurement ◽  
Frequency Count ◽  
Frequency Multiplication ◽  
Circuit Performance ◽  
Standard Frequency ◽  
Synchronization Signal ◽  
Precision Frequency

In accordance with the principle of equal precision frequency measurement and theory of errors, in this paper, the problems are discussed that the equal precision frequency measurement eliminates the standard frequency count error. In order to reduce the relative error and improve the measurement accuracy, a method is proposed for phase coincide detection between standard frequency multiplication and measurement frequency demultiplication to open or shut the gate, at the same time, a signal selector is also used to improve circuit performance. This method can effectively solve the problem that the frequency can not be detected without the synchronization signal and improve the performance of the frequency measurement system.

scholarly journals Low Altitude Measurement Accuracy Improvement of the Airborne FMCW Radio Altimeters

Electronics ◽  
2019 ◽  
Vol 8 (8) ◽  
pp. 888 ◽  
Author(s):  
Ján Labun ◽  
Pavol Kurdel ◽  
Marek Češkovič ◽  
Alexey Nekrasov ◽  
Ján Gamec
Keyword(s):  
Traffic Safety ◽  
Basic Equation ◽  
Measurement Accuracy ◽  
Digital Processing ◽  
Critical Height ◽  
New Findings ◽  
Low Altitude ◽  
The Difference ◽  
Definition Of ◽  
Dynamic Formation

This manuscript focuses on the analysis of a critical height of radio altimeters that can help for the development of new types of aeronautical radio altimeters with increased accuracy in measuring low altitudes. Altitude measurement accuracy is connected with a form of processing the difference signal of a radio altimeter, which carries information on the measured altitude. The definition of the altitude measurement accuracy is closely linked to the value of a critical height. Modern radio altimeters with digital processing of a difference signal could shift the limit of accuracy towards better values when the basics of the determination of critical height are thoroughly known. The theory results from the analysis and simulation of dynamic formation and the dissolution of the so-called stable and unstable height pulses, which define the range of the critical height and are presented in the paper. The theory is supported by a new method of derivation of the basic equation of a radio altimeter based on a critical height. The article supports the new theory of radio altimeters with the ultra-wide frequency deviation that lead to the increase the accuracy of a low altitude measurement. Complex mathematical analysis of the dynamic formation of critical height and a computer simulation of its course supported by the new form of the derivation of the basic equation of radio altimeter guarantee the correctness of the new findings of the systematic creation of unstable height pulses and the influence of their number on the altitude measurement accuracy. Application of the presented findings to the aviation practice will contribute to increasing the accuracy of the low altitude measurement from an aircraft during its landing and to increasing air traffic safety.

scholarly journals Possibilities of Increasing the Low Altitude Measurement Precision of Airborne Radio Altimeters

Electronics ◽  
2018 ◽  
Vol 7 (9) ◽  
pp. 191 ◽  
Author(s):  
Ján Labun ◽  
Martin Krchňák ◽  
Pavol Kurdel ◽  
Marek Češkovič ◽  
Alexey Nekrasov ◽  
...  
Keyword(s):  
Traffic Safety ◽  
Pulse Shaping ◽  
Measurement Accuracy ◽  
Continuous Wave ◽  
Digital Processing ◽  
Measurement Precision ◽  
Frequency Increase ◽  
Height Measurement ◽  
Low Altitude ◽  
Double Channel

The paper focuses on the new trend of increasing the accuracy of low altitudes measurement by frequency-modulated continuous-wave (FMCW) radio altimeters. The method of increasing the altitude measurement accuracy has been realized in a form of a frequency deviation increase with the help of the carrier frequency increase. In this way, the height measurement precision has been established at the value of ±0.75 m. Modern digital processing of a differential frequency cannot increase the accuracy limitation considerably. It can be seen that further increase of the height measurement precision is possible through the method of innovatory processing of so-called height pulses. This paper thoroughly analyzes the laws of height pulse shaping from the differential frequency presented by the number that represents the information about the measured altitude for this purpose. This paper presents the results of the laboratory experimental altitude measurement with the use of a so-called double-channel method. The application of obtained results could contribute to the increase of air traffic safety, mainly in the phase of the aircraft approaching for landing and landing itself.

scholarly journals Phase and Frequency Matching-based Signal Processing Method for Coriolis Mass Flowmeters

2016 ◽  
Vol 16 (2) ◽  
pp. 62-67 ◽  
Author(s):  
Yaqing Tu ◽  
Yanlin Shen ◽  
Haitao Zhang ◽  
Ming Li
Keyword(s):  
Signal Processing ◽  
Phase Difference ◽  
Cross Correlation ◽  
Measurement Accuracy ◽  
Frequency Estimation ◽  
Correlation Method ◽  
Processing Method ◽  
Transform Method ◽  
Frequency Matching ◽  
Signal Processing Method

AbstractSignal processing precision of Coriolis mass flowmeters affects the measurement accuracy directly. To improve the measurement accuracy of Coriolis mass flowmeters, a phase and frequency matching-based signal processing method for Coriolis mass flowmeters is proposed. Estimated phase difference is obtained by means of frequency estimation, 90° phase shift, generating reference signals and cross-correlation. Simulated results demonstrate that the proposed method has better phase difference estimation and anti-interference performance than the Hilbert transform method, cross-correlation method, data extension-based correlation method, and quadrature delay estimator. Measurement results of Coriolis mass flowmeters verify the effectiveness and superiority of the proposed method in practice.

Improved digital processing method used for image motion measurement based on hybrid opto-digital joint transform correlator

2010 ◽  
Vol 8 (10) ◽  
pp. 989-992 ◽  
Author(s):  
易红伟 Hongwei Yi ◽  
赵惠 Hui Zhao ◽  
李英才 Yingcai Li ◽  
汶德胜 Desheng Wen
Keyword(s):  
Digital Processing ◽  
Processing Method ◽  
Image Motion ◽  
Joint Transform Correlator ◽  
Motion Measurement

Time-to-peak of time derivative signals of pulsed eddy current testing for evaluating the thickness of ferromagnetic samples

2021 ◽  
Vol 63 (2) ◽  
pp. 88-94
Author(s):  
Dongdong Wen ◽  
Shuchen Wang ◽  
Lei Zhang ◽  
Jianhua Zhang
Keyword(s):  
Eddy Current ◽  
Measurement Accuracy ◽  
Time Derivative ◽  
Thickness Measurement ◽  
Processing Method ◽  
Current Testing ◽  
Time To Peak ◽  
Pulsed Eddy Current ◽  
Precision Evaluation ◽  
Lift Off

The time-to-peak serves as a popular signal feature of pulsed eddy current (PEC) signals and is widely used in thickness measurement and defect detection. In order to further improve the ability of time-to-peak independent of the lift-off effect, a time derivative processing method is proposed in this paper to obtain a better time-to-peak feature of time derivative signals of PEC for reducing the lift-off effect. The method is used to improve the thickness measurement accuracy of ferromagnetic samples. The results of simulation and experimentation demonstrate that a time-to-peak feature of time derivative signals of PEC can be obtained using the time derivative processing method and the timeto-peak obtained from time derivative signals of PEC can be used to measure the thickness and improve the thickness measurement accuracy of ferromagnetic samples. This means that the use of the time-to-peak of time derivative signals of PEC is feasible for high-precision evaluation of the thickness of ferromagnetic samples.

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