Method for high-precision distance estimation and dispersion mismatch compensation in frequency scanning interferometry

2019 ◽  
Author(s):  
Hao Pan ◽  
Xinghua Qu ◽  
fumin zhang
Keyword(s):  
High Precision ◽  
Distance Estimation ◽  
Frequency Scanning ◽  
Frequency Scanning Interferometry

scholarly journals A method of suppressing vibration for high precision broadband laser frequency scanning interferometry

2016 ◽  
Vol 65 (20) ◽  
pp. 209501
Author(s):  
Liu Guo-Dong ◽  
Xu Xin-Ke ◽  
Liu Bing-Guo ◽  
Chen Feng-Dong ◽  
Hu Tao ◽  
...  
Keyword(s):  
High Precision ◽  
Laser Frequency ◽  
Frequency Scanning ◽  
Broadband Laser ◽  
Frequency Scanning Interferometry

scholarly journals High-Precision RTT-Based Indoor Positioning System Using RCDN and RPN

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3701
Author(s):  
Ju-Hyeon Seong ◽  
Soo-Hwan Lee ◽  
Won-Yeol Kim ◽  
Dong-Hoan Seo
Keyword(s):  
High Precision ◽  
Distance Estimation ◽  
Sampling Period ◽  
Multipath Fading ◽  
Indoor Positioning ◽  
Positioning System ◽  
Positioning Systems ◽  
Positioning Errors ◽  
Location Determination ◽  
Indoor Positioning System

Wi-Fi round-trip timing (RTT) was applied to indoor positioning systems based on distance estimation. RTT has a higher reception instability than the received signal strength indicator (RSSI)-based fingerprint in non-line-of-sight (NLOS) environments with many obstacles, resulting in large positioning errors due to multipath fading. To solve these problems, in this paper, we propose high-precision RTT-based indoor positioning system using an RTT compensation distance network (RCDN) and a region proposal network (RPN). The proposed method consists of a CNN-based RCDN for improving the prediction accuracy and learning rate of the received distances and a recurrent neural network-based RPN for real-time positioning, implemented in an end-to-end manner. The proposed RCDN collects and corrects a stable and reliable distance prediction value from each RTT transmitter by applying a scanning step to increase the reception rate of the TOF-based RTT with unstable reception. In addition, the user location is derived using the fingerprint-based location determination method through the RPN in which division processing is applied to the distances of the RTT corrected in the RCDN using the characteristics of the fast-sampling period.

scholarly journals An efficient method for the compensation of dispersion mismatch in the frequency-scanning interferometry

2021 ◽  
Author(s):  
Qiang Zhou ◽  
Tengfei Wu ◽  
Yang Liu ◽  
yue shang ◽  
Jiarui Lin ◽  
...  
Keyword(s):  
Efficient Method ◽  
Frequency Scanning ◽  
Frequency Scanning Interferometry

scholarly journals Vibration Compensation of the Frequency-Scanning-Interferometry-Based Absolute Ranging System

2019 ◽  
Vol 9 (1) ◽  
pp. 147 ◽  
Author(s):  
Fu-Min Zhang ◽  
Ya-Ting Li ◽  
Hao Pan ◽  
Chun-Zhao Shi ◽  
Xing-Hua Qu
Keyword(s):  
Standard Deviation ◽  
Vibration Frequency ◽  
Phase Modulation ◽  
Vibration Velocity ◽  
Sinusoidal Vibration ◽  
Vibration Effect ◽  
Frequency Scanning ◽  
Blind Area ◽  
Frequency Scanning Interferometry ◽  
Vibration Compensation

The frequency-scanning-interferometry-based (FSI-based) absolute ranging technology is a type of ranging technology possessing a high precision and no ranging blind area, so it can be used for non-cooperative targets. However, due to a tiny movement of a target, the Doppler shift and the phase modulation are introduced into the beat signal which results in ranging accuracy decrease. In order to solve this problem, first the model of vibration effect is established, and then the beat signals of two adjacent scanning periods are processed to produce a signal that is immune to vibration. The proposed method is verified by the experiments, and the experimental results show that the effect of vibration compensation is better for the target with a lower vibration velocity and at a lower vibration frequency (lower than 6 Hz). When the target is subjected to a sinusoidal vibration with an amplitude of 10 μm at a frequency of 1 Hz, by using the proposed method the standard deviation is reduced from 775 to 12 μm. Moreover, in the natural environment, by using vibration compensation the standard deviation is reduced from 289 to 11 μm.

Double sideband frequency scanning interferometry for distance measurement in the outdoor environment

2018 ◽  
Vol 425 ◽  
pp. 176-179 ◽  
Author(s):  
Keshu Zhang ◽  
Tian Lv ◽  
Di Mo ◽  
Ning Wang ◽  
Ran Wang ◽  
...  
Keyword(s):  
Distance Measurement ◽  
Outdoor Environment ◽  
Frequency Scanning ◽  
Frequency Scanning Interferometry
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