Bearings only target tracking with signal time delay using the IRPUKF algorithm

2006 ◽  
Author(s):  
Anke Xue ◽  
Yunfei Guo
Keyword(s):  
Time Delay ◽  
Target Tracking ◽  
Signal Time

scholarly journals Underwater 3D Doppler-Angle Target Tracking with Signal Time Delay

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 3869
Author(s):  
Jun Su ◽  
Yaan Li ◽  
Wasiq Ali ◽  
Xiaohua Li ◽  
Jing Yu
Keyword(s):  
Time Delay ◽  
Target Tracking ◽  
Unscented Kalman Filter ◽  
Signal Propagation ◽  
The State ◽  
Estimation Accuracy ◽  
Target Range ◽  
Implicit Equations ◽  
Passive Acoustic ◽  
Signal Time

The traditional target tracking is a process of estimating the state of a moving target using measurement information obtained by sensors. However, underwater passive acoustic target tracking will confront further challenges, among which the system incomplete observability and time delay caused by the signal propagation create a great impact on tracking performance. Passive acoustic sensors cannot accurately obtain the target range information. The introduction of Doppler frequency measurement can improve the system observability performance; signal time delay cannot be ignored in underwater environments. It varies with time, which has a continuous negative impact on the tracking accuracy. In this paper, the Gauss–Helmert model is introduced to solve this problem by expanding the unknown signal emission time as an unknown variable to the state. This model allows the existence of the previous state and current state at the same time, while handling the implicit equations. To improve the algorithm accuracy, this paper further takes advantage of the estimated state and covariance for the second stage iteration and propose the Gauss–Helmert iterated Unscented Kalman filter under a three-dimensional environment. The simulation shows that the proposed method in this paper shows superior estimation accuracy and more stable performance compared with other filtering algorithms in underwater environments.

Calibration of ultrasound tester delay time by cutting a wooden beam

2020 ◽  
Vol 110 ◽  
pp. 131-139
Author(s):  
Zbigniew Karwat
Keyword(s):  
Time Delay ◽  
Ultrasonic Wave ◽  
Independent Method ◽  
Measured Signal ◽  
Test Results ◽  
Measuring Device ◽  
Reliable Test ◽  
Metal Disc ◽  
Standard Calibration ◽  
Signal Time

Obtaining precise and reliable test results requires specific tools on one hand, and at the same time, reliability of the results should not be questioned. One of the necessary steps to achieve this goal is the calibration of the measuring device before the test. This article describes an experiment involving calibration of the device by an independent method called cutting beam calibration carried out on the ultrasonic material tester UMT 01. The standard calibration of this device is carried out by using a dedicated metal disc as a template. Calibration of the tester consisted of determining the time delay of the measured signal. The obtained results were used to prepare charts and to determine of signal time delay, called correction, which also allowed determining the velocity of ultrasonic wave in the tested material in three ways. The experiment was conducted on samples of three species of wood: Norway spruce, Scots pine and sycamore. The velocity of ultrasonic wave from research was compared with literature data.

scholarly journals Adaptive Wide-Area Damping Control Scheme for Smart Grids with Consideration of Signal Time Delay

Energies ◽  
2013 ◽  
Vol 6 (9) ◽  
pp. 4841-4858 ◽  
Author(s):  
Guowei Cai ◽  
Deyou Yang ◽  
Cheng Liu
Keyword(s):  
Time Delay ◽  
Smart Grids ◽  
Wide Area ◽  
Damping Control ◽  
Control Scheme ◽  
Signal Time

scholarly journals Seismic coherence in the presence of signal time-delay fluctuations

2018 ◽  
Vol 40 (2) ◽  
pp. 30-47
Author(s):  
Yu. K. Tyapkin ◽  
I. V. Mendrii ◽  
O. Yu. Shchegolikhin ◽  
O. M. Tiapkina
Keyword(s):  
Time Delay ◽  
Signal Time

The Homicidal Chauffeur Problem With Time Delayed Feedback

2003 ◽  
Author(s):  
Nejat Olgac ◽  
Rifat Sipahi ◽  
Ali Fuat Ergenc
Keyword(s):  
Time Delay ◽  
Feedback Control ◽  
Target Tracking ◽  
Critical Parameter ◽  
Delayed Feedback ◽  
Control Law ◽  
Pursuit Evasion ◽  
Parking Lot ◽  
Homicidal Chauffeur ◽  
Time Delayed Feedback

The classical pursuit-evasion scenario (target tracking) is studied with an interesting perspective. A homicidal chauffeur (pursuer) tries to capture an evader on a 2-dimensional platform (a parking lot). It utilizes a certain feedback control law, which enables the capture. If, however, a time delay is introduced for the sensory perception of the pursuer the performance of the pursuer can show dramatic changes. It may or may not capture its victim depending on this very critical parameter, the sensory time delay. The unique perspective is introduced at this feature.

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