Results 91 to 100 of about 533,452 (194)
Conical-scan tracking with the 64-m-diameter antenna at goldstone [PDF]
, 1976 The theory and experimental work which demonstrated the feasibility of conical-scan tracking with a 64 m diameter paraboloid antenna is documented. The purpose of this scheme is to actively track spacecraft and radio sources continuously with an accuracy
Ohlson, J. E., Reid, M. S.
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Minimizing Change-Point Estimation Error
, 2023 In this paper we consider change-points in multiple sequences with the objective of minimizing the estimation error of a sequence by making use of information from other sequences. This is in contrast to recent interest on change-points in multiple sequences where the focus is on detection of common change-points.
openaire +2 more sources
Pointing compensation system for spacecraft instruments [PDF]
, 1987 A closed loop system reduces pointing errors in one or more spacecraft instruments. Associated with each instrument is a electronics package (3) for commanding motion in that instrument and a pointing control system (5) for imparting motion in that ...
Gamble, Donald W., Plescia, Carl T.
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Is the Pre-WMAP CMB Data Self-consistent?
, 2003 Although individual observational groups vigorously test their data sets for systematic errors, the pre-WMAP CMB observational data set has not yet been collectively tested.
Bennett +14 more
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Thermal-distortion analysis of a spacecraft box truss in geostationary orbit [PDF]
The Mission to Planet Earth enlists the use of a geostationary platform to support Earth science monitoring instruments. The strongback for a proposed geostationary platform is a deployable box truss that supports two large diameter passive microwave ...
Cosgrove, Patrick A. +2 more
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Pointing a ground antenna at a spinning spacecraft using Conscan-simulation results [PDF]
The results are presented for an investigation of ground antenna pointing errors which are caused by fluctuations of the receiver AGC signal due to thermal noise and a spinning spacecraft.
Mileant, A., Peng, T.
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Disturbance torque rejection properties of the NASA/JPL 70-meter antenna axis servos [PDF]
Analytic methods for evaluating pointing errors caused by external disturbance torques are developed and applied to determine the effects of representative values of wind and friction torque.
Hill, R. E.
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IEEE Open Journal of Vehicular TechnologyIn this article, exact expressions are presented for the probability density function, cumulative distribution function, moment generating function, and higher-order moments of the instantaneous signal-to-noise ratio, considering the product and the sum ...
Pedro H. D. Almeida +5 more
doaj +1 more source
Active retrodirective arrays for SPS beam pointing [PDF]
The basic requirement of the SPS beam pointing system is that it deliver a certain amount of S-band (lambda = 12.5 cm) power to a 9.6 km diameter receiving rectenna on the ground.
Chernoff, R.
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