Searched for: author%3A%22Bosgra%2C+J.A.%22
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Ambrosius, B. (author), Bosgra, J.A. (author), van Driel, N. (author), Joosten, L.J.M. (author), Klinker, F. (author), Monkel, A. (author), Pietersen, O.B.M. (author), Slippens, C. (author)
In order to come to a unified concept for the future civil satellite navigation system, it was studied which characteristics of the two major proposed concepts, NAVSAT and GRANAS, would be preferred for such a system. This investigation encompassed the preferred orbit configuration, the satellite position determination principle and the...
report 1987
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Bosgra, J.A. (author)
Deze lijst van ruimtevaart-acronymen is het resultaat van een alfabetisch gesorteerd letterwoordenbestand op de Cyber. Het is de derde aangevulde uitgave. Bij het gebruik van de lijst wordt de lezer verzocht om in gedachten te houden dat voor het acronym ACRONYMS de volgende tekst gegeven kan worden: Artifices to Confuse the Reader; by...
report 1986
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Bosgra, J.A. (author), Prins, J.J.M. (author)
The first part of the paper presents the results of measurements on torque and force irregularities of running reaction wheels. Six different, current technology European wheels, both with ball- and magnet bearings, and with d.c. and a.c. drive motors are examined. Time-domain behaviour around zero wheel speed as well as noise at certain...
report 1982
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Bosgra, J.A. (author), Reumers, J.J.M. (author)
Noise measurements have been performed on two identical space-qualified gyroscopes of the floated rate-integrating type (Ferranti Type 125) in an analogue rebalance-loop configuration of selectable loop bandwidth, running under space representative conditions. The noise frequency range of interest was 0.005 to 50 Hz. The noise results have been...
report 1981
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Bosgra, J.A. (author), Reumers, J.J. (author)
Noise measurements have been performed on two identical space-qualified gyroscopes of the floated rate-integrating type (Ferranti Type 125) in an analogue rebalance-loop configuration of selectable loop bandwidth, running under spacerepresentative conditions. The noise frequency range of interest was 0.005 to 50 Hz. The noise results have been...
report 1981
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Rahlfs, D. (author), Bosgra, J.A. (author)
This Memorandum resulted from a co-operation between department "Kreiselgerate und Tragheitsortung" of DFVLR - Braunschweig and "Spaceflight Department" of NLR - Noordoostpolder.
report 1980
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Bosgra, J.A. (author)
Noise measurements were performed on two identical space qualified gyroscopes of the floated rate integrating type (Perranti Type I25) in an analog rehalance loop configuration of selectable loop bandwidth, running under space representative conditions. The noise frequency range of interest was O.OO5 Hz to 50 Hz. The noise results were processed...
report 1979
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Bosgra, J.A. (author), Mooy, A.J. (author), Smilde, H. (author)
In this report the phenomenon of cross-coupling drift (both S-IA and S-OA) due to vehicular angular movements is investigated. In a hardware test set-up, using an experimental Single Axis Platform composed of surplus parts from the former Eldo-A program, the theoretical result as well as a proposed method of compensation is verified.
report 1976
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Bosgra, J.A. (author)
The paper describes a rudder actuating system for attitude control of a sounding rocket with a fast forced roll during its ascending flight. A description is given of the mechanism that converts a continuous rotation of the driving d-c servomotor into sinusoidal rudder movements, synchronized by a phaselock loop. It is shown that in the case of...
report 1971
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Boersma, G. (author), Bosgra, J.A. (author), Kruisbrink, H.A. (author), Schmeitink, C.A. (author)
A comparison is made between unguided rockets, attitude stabilized rockets and rockets with control of the horizontal velocity components, all with one or two stages. Special emphasis is placed on impact dispersion, which is treated analytically. The best system appears to be a two stage rocket with unguided first stage and velocity control on...
report 1970
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