Results 21 to 30 of about 947,716 (287)
An independent distance estimate to the AGB star R Sculptoris [PDF]
, 2017 For the carbon AGB star R Sculptoris, the uncertain distance significantly affects the interpretation of observations regarding the evolution of the stellar mass loss during and after the most recent thermal pulse.
Brunner, M. +3 more
core +2 more sources
Absolute distance measurements using two-mode laser telemetry [PDF]
International Conference on Space Optics — ICSO 2008, 2017 A novel laser ranging method is described that uses a two-mode laser source, and detection of the phase of the return beam. The design eliminates the cyclic error usually associated with phase measurements and provides unambiguous, absolute distance determination. Measurements of an ≈ 8m path are obtained at a beat frequency of 13 GHz.
Lintz, Michel +3 more
openaire +2 more sources
High-Stable RF-Frequency Generation Using a Microcontroller for Amplitude Modulation Based Absolute Distance Measurement [PDF]
한국정밀공학회지, 2019 In this paper, we describe high-stable RF-frequency generation using a low-cost 8-bit microcontroller for amplitude-modulation based distance measurement, which is one of the indispensable technologies for cost-effective Lidar application.
Yeongjin Yu, Joohyung Lee
doaj +1 more source
Interferometry for High Resolution Absolute Distance Measuring by Larger Distances [PDF]
, 1994 Among the incoherent techniques the phase measurement of modulated light seem to have reached some limitation with an resolution of less than 1 mm. This limitation is set by the bandwidth of the photodetector. The coherent techniques operate with two wavelengths to extend the unambiguity range of the classical interferometry.
Dalhoff, Ernst +3 more
openaire +1 more source
The distance to the Vela pulsar gauged with HST parallax oservations [PDF]
, 2001 The distance to the Vela pulsar (PSR B0833-45) has been traditionally assumed to be 500 pc. Although affected by a significant uncertainty, this value stuck to both the pulsar and the SNR. In an effort to obtain a model free distance measurement, we have
A. De Luca +12 more
core +2 more sources
Applied Sciences, 2020 We report an absolute interferometer configured with a 1 GHz microwave source photonically synthesized from a fiber mode-locked laser of a 100 MHz pulse repetition rate.
Wooram Kim +5 more
doaj +1 more source
Why GPS makes distances bigger than they are [PDF]
, 2015 Global Navigation Satellite Systems (GNSS), such as the Global Positioning System (GPS), are among the most important sensors for movement analysis. GPS is widely used to record the trajectories of vehicles, animals and human beings.
Brunauer, Richard +4 more
core +2 more sources
Dual-Comb Absolute Distance Measurement Based on a Dual-Wavelength Passively Mode-Locked Laser
IEEE Photonics Journal, 2017 A new absolute distance measurement system is demonstrated in this paper, which is based on a dual-wavelength passive mode-locked fiber laser. By controlling the intracavity loss and spectral filtering, the cavity mode-locked by a single-wall carbon ...
Baike Lin +9 more
doaj +1 more source
Research on absolute ranging technology of resampling phase comparison method based on FMCW
Open Physics, 2023 As an advanced optical precision ranging method, FMCW (frequency-modulated continuous-wave) laser interferometric ranging technology can achieve a large-scale and high-precision absolute distance measurement, so it has high research and application value
Sun Bin +4 more
doaj +1 more source
Elimination of systematic errors in two-mode laser telemetry [PDF]
, 2009 4p.International audienceWe present a simple two-mode telemetry procedure which eliminates cyclic errors, to allow accurate absolute distance measurements.
Brillet, Alain +2 more
core +4 more sources