Double Interpolation Method in Time-Interval Measurement

2013 ◽  
Vol 753-755 ◽  
pp. 2153-2158
Author(s):  
Hui Qin Zhan ◽  
Shuo Li ◽  
Jun Gu
Keyword(s):  
Interpolation Method ◽  
Time Interval ◽  
Short Time Interval ◽  
Interval Measurement ◽  
Key Technology ◽  
Measurement Resolution ◽  
High Measurement ◽  
Time Interval Measurement ◽  
Short Time ◽  
Measurement Rate

Analog interpolation is the key technology of high-resolution short time-interval measurement. This study proposes a double interpolation method in time-interval measurement. The technique greatly improves the resolution of the analog time expander, which is based on the principle of charging and discharging of the capacitor. This method can significantly reduce the interpolation time, effectively solve the conflict between high measurement resolution and fast measurement rate. The principle of the time measurement expander based on double interpolation method is described in this paper and compared with the expander based on single interpolation method. Its measurement error is also analyzed in this study.

Accuracy Analysis of Sensor Array Direction-Finding Crossing for the Sound Location of Burst Point

2013 ◽  
Vol 823 ◽  
pp. 326-330
Author(s):  
Jun Jun Zong ◽  
Xun Xue Cui ◽  
Hui Yang ◽  
Kai Ping Yu ◽  
Yan Wu ◽  
...  
Keyword(s):  
Direction Finding ◽  
Baseline Length ◽  
Measurement Technology ◽  
Time Interval ◽  
Short Time Interval ◽  
Estimation Formula ◽  
Single Station ◽  
Precision Estimation ◽  
Time Interval Measurement ◽  
Short Time

With development of the short time interval measurement technology, array direction-finding technique for burst point localization has been applied to the actual. In this paper we conduct in the following order: the basic positioning principle will be elaborated at first. Then the precision estimation formula of the positioning will be deduced. Finally we perform the simulation experiment. The simulation results show that, if you want to improve the burst positioning accuracy, you need to decrease the measurement error of single station, and choose reasonable arrangement mode and the appropriate baseline length as far as possible.

Estimation of Time-Dependent Turning Fractions at Signalized Intersections

1998 ◽  
Vol 1644 (1) ◽  
pp. 142-149 ◽  
Author(s):  
Gang-Len Chang ◽  
Xianding Tao
Keyword(s):  
Signalized Intersections ◽  
Efficient Estimation ◽  
Estimation Accuracy ◽  
Time Interval ◽  
Short Time Interval ◽  
Simulation Experiments ◽  
Proposed Model ◽  
Short Time ◽  
Estimation Of Time ◽  
Additional Constraints

An effective method for estimating time-varying turning fractions at signalized intersections is described. With the inclusion of approximate intersection delay, the proposed model can account for the impacts of signal setting on the dynamic distribution of intersection flows. To improve the estimation accuracy, the use of preestimated turning fractions from a relatively longer time interval has been proposed to serve as additional constraints for the same estimation but over a short time interval. The results of extensive simulation experiments indicated that the proposed method can yield sufficiently accurate as well as efficient estimation of dynamic turning fractions for signalized intersections.

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