11 papers · ranked by Valyu relevance
Fuqian Li, Wenjing Chen, Liang Zhang, Mohammed Bennamoun + 1 more
'Mingtao Feng'] Crossed-grating phase-shifting profilometry (CGPSP) has great utility in three-dimensional shape measurement due to its ability to acquire horizontal and vertical phase maps in a single measurement. However, CGPSP is extremely sensitive to the non-linearity effect of a digital fringe projection system…
Bo Li, Falin Liu, Chongbin Zhou, Yuanhao Lv + 2 more
'Ram M. Narayanan'] Defocus of the reconstructed image of synthetic aperture radar (SAR) occurs in the presence of the phase error. In this work, a phase error correction method is proposed for compressed sensing (CS) radar imaging based on approximated observation. The proposed method has better image focusing ability…
Alexander Schultze, Dennis Weise, Alexander Sell, Claus Braxmaier
The delay of photodetectors can be affected by intensity, reverse bias, and temperature through different effects. An optical pilot tone superimposed on the detectors allows the independent measurement of such phase errors in the complete photodetection chain and provides an opportunity to correct them. This allows…
Lorant A. Muth
This study was conducted to verify that the probe-position error correction can be successfully applied to real data obtained on a planar near-field range where probe position errors are known. Since probe position-error correction is most important at high frequencies, measurements were made at 60 GHz. Six planar…
Л. Б. Лиокумович, Konstantin Muravyov, Philipp V. Skliarov, Nikolai Ushakov
'Nikolai Ushakov'] In the current paper, we have developed an analytical apparatus, allowing to calculate the phase error, produced by miscalibration of modulation parameters. The case of harmonic modulation is considered, the analysis is performed for cases of two parameters miscalibration: amplitude and start phase.…
Pengcheng Hu, Jinghao Zhu, Xuanbiao Guo, Jiubin Tan
This paper presents a real-time method to compensate for the variable cyclic error in a homodyne laser interferometer. The parameters describing the quadrature signals of the interferometer are estimated using simple peak value detectors. The cyclic error in the homodyne laser interferometer was then corrected through…
Rongjun Mu, Teng Long, Kamil Krasuski, Chris Rizos
For the tracking of high-dynamic satellite navigation signals, the conventional scalar tracking loop (STL) is vulnerable. Frequent signal-tracking interruption affects the continuity of navigation. The vector tracking loop (VTL) can overcome this disadvantage. However, there are some difficulties in implementing…
Haijin Fu, Yue Wang, Pengcheng Hu, Jiubin Tan + 1 more
Even after the Heydemann correction, residual nonlinear errors, ranging from hundreds of picometers to several nanometers, are still found in heterodyne laser interferometers. This is a crucial factor impeding the realization of picometer level metrology, but its source and mechanism have barely been investigated. To…
Л. Б. Лиокумович, А. В. Медведев, Konstantin Muravyov, Philipp V. Skliarov + 1 more
'Philipp V. Skliarov' 'Nikolai Ushakov'] In current paper, distortions in digital demodulation schemes with harmonic phase modulation for interferometric optical sensors are considered. In particular, the influence of target signal variations on phase demodulation errors is theoretically evaluated. An analytical…
Lutz Rapp
Existing unrepeatered submarine links are increasingly upgraded to the most advanced modulation format currently available for commercial applications. Quite often the use of third–order codirectional Raman amplifiers is necessary. Power fluctuations of the involved high–power pump induces phase shifts in phase…
Philipp Euringer, Gerald Hechenblaikner, Francis Soualle, Walter Fichter
'Walter Fichter'] Abstract—Future space observatories achieve detection of gravitational waves by interferometric measurements of a carrier phase, allowing to determine relative distance changes, in combination with an absolute distance measurement based on the transmission of pseudo-random noise chip sequences. In…