Use of close range photogrammetry in James Webb Space Telescope alignment testing under cryogenic conditions

In view of the heavy workload and possible intervention to the normal traffic flow during the performance testing of road traffic signs, this paper is designed to present a system that can be installed in an automobile and automatically track and analyze the performance of traffic signs. The system consists of a carrying vehicle, GPS, IMU, area-array cameras, frame grabbers, data acquisition software and data analysis software. Based on close-range photogrammetry technology, the system is designed with a set of effective road traffic signs automatic detection algorithms, which can automatically measure and analyze the properties of road traffic signs, such as dimensions, headroom and verticality of the column, etc.

Download Full-text

Determination of coating emittance at cryogenic temperatures for the James Webb Space Telescope: experimental methods and results

10.1117/12.624002 ◽

2005 ◽

Cited By ~ 2

Author(s):

Warren Tolson ◽

Chuen Or ◽

Stuart Glazer ◽

Mark Kobel ◽

Edward Packard

Keyword(s):

Experimental Methods ◽

Cryogenic Temperatures ◽

Space Telescope ◽

James Webb Space Telescope

Download Full-text

The James Webb Space Telescope (JWST)

Advances in Space Research ◽

10.1016/j.asr.2008.01.010 ◽

2008 ◽

Vol 41 (12) ◽

pp. 1983-1991 ◽

Cited By ~ 22

Author(s):

Mark Clampin

Keyword(s):

Space Telescope ◽

James Webb Space Telescope

Download Full-text

The mid-infrared instrument for the James Webb Space Telescope: performance and operation of the Low-Resolution Spectrometer

10.1117/12.2232887 ◽

2016 ◽

Author(s):

Sarah Kendrew ◽

Silvia Scheithauer ◽

Patrice Bouchet ◽

Jerome Amiaux ◽

Ruymán Azzollini ◽

...

Keyword(s):

Low Resolution ◽

Mid Infrared ◽

Space Telescope ◽

James Webb Space Telescope ◽

Resolution Spectrometer

Download Full-text

Observatory alignment of the James Webb Space Telescope

10.1117/12.926816 ◽

2012 ◽

Author(s):

J. Scott Knight ◽

D. Scott Acton ◽

Paul Lightsey ◽

Adam Contos ◽

Allison Barto

Keyword(s):

Space Telescope ◽

James Webb Space Telescope

Download Full-text

ILRS Reference Point Determination Using Close Range Photogrammetry

Applied Sciences ◽

10.3390/app11062785 ◽

2021 ◽

Vol 11 (6) ◽

pp. 2785

Author(s):

Michael Lösler ◽

Cornelia Eschelbach ◽

Thomas Klügel ◽

Stefan Riepl

Keyword(s):

Reference Point ◽

Reference Points ◽

Geodetic Reference System ◽

Unscented Transformation ◽

Local Ties ◽

Close Range Photogrammetry ◽

Crucial Component ◽

Space Geodetic Techniques ◽

Close Range ◽

Point Determination

A global geodetic reference system (GGRS) is realized by physical points on the Earth’s surface and is referred to as a global geodetic reference frame (GGRF). The GGRF is derived by combining several space geodetic techniques, and the reference points of these techniques are the physical points of such a realization. Due to the weak physical connection between the space geodetic techniques, so-called local ties are introduced to the combination procedure. A local tie is the spatial vector defined between the reference points of two space geodetic techniques. It is derivable by local measurements at multitechnique stations, which operate more than one space geodetic technique. Local ties are a crucial component within the intertechnique combination; therefore, erroneous or outdated vectors affect the global results. In order to reach the ambitious accuracy goal of 1 mm for a global position, the global geodetic observing system (GGOS) aims for strategies to improve local ties, and, thus, the reference point determination procedures. In this contribution, close range photogrammetry is applied for the first time to determine the reference point of a laser telescope used for satellite laser ranging (SLR) at Geodetic Observatory Wettzell (GOW). A measurement campaign using various configurations was performed at the Satellite Observing System Wettzell (SOS-W) to evaluate the achievable accuracy and the measurement effort. The bias of the estimates were studied using an unscented transformation. Biases occur if nonlinear functions are replaced and are solved by linear substitute problems. Moreover, the influence of the chosen stochastic model onto the estimates is studied by means of various dispersion matrices of the observations. It is shown that the resulting standard deviations are two to three times overestimated if stochastic dependencies are neglected.

Download Full-text