منابع مشابه
INTEGRAL / SPI ground calibration
Three calibration campaigns of the spectrometer SPI have been performed before launch in order to determine the instrument characteristics, such as the effective detection area, the spectral resolution and the angular resolution. Absolute determination of the effective area has been obtained from simulations and measurements. At 1 MeV, the effective area is 65 cm 2 for a point source on the opt...
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AbstmctIn order to achieve highly accurate calibration of the SeaWinds scatterometer, a calibration ground station (CGS) was constructed by Jet Propulsion Lab (JPL) at White Sands, New Mexico, in association with the QuikSCAT mission. This receive-only system precisely measures the time, frequency, and power of the SeaWinds transmit signal as it passes overhead. From the CGS data, key instrumen...
متن کاملLinear Auto-Calibration for Ground Plane Motion
Planar scenes would appear to be ideally suited for selfcalibration because, by eliminating the problems of occlusion and parallax, high accuracy two-view relationships can be calculated without restricting motion to pure rotation. Unfortunately, the only monocular solutions so far devised involve costly non-linear minimisations which must be initialised with educated guesses for the calibratio...
متن کاملSelf-calibration of Unattended Ground Sensor Networks
We present an algorithm for locating and orienting a set of acoustic arrays that have been deployed in a scene at unknown locations and orientation angles. This self-calibration problem is solved using a number of source signals also deployed in the scene. We assume each array can estimate the time-of-arrival and direction-of-arrival (with respect to the array’s local orientation coordinates) o...
متن کاملCalibration of Seismometers Using Ground Noise
We have developed and tested a new technique for calibration of seismometers using continuous recordings of ground noise. The method is founded on analytic techniques recently developed for estimation of transfer functions in magnetotellurics. We find that the technique can produce precise, absolute calibration measurements on sensors that do not have calibration coils. The data used are obtain...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2003
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20031439