Development procedures of the on-board attitude control software for the SAX satellite

The Italian/Dutch SAX satellite, launched at April 30, 1996, is a scientific spacecraft, built to explore celestial X-ray sources. The software for the Attitude and Orbit Control Subsystem onboard computer for SAX consists of special purpose Basic Software, which performs operating system functions, and of Application Software (ASW). The ASW has...

Product assurance for the development of the SAX AOCS application software

The Italian/Dutch SAX satellite, to be launched end of April 1996, is a scientific spacecraft, built to explore celestial X-ray sources. The software for the Attitude and Orbit Control Subsystem on-board computer for SAX consists of special purpose Basic Software, which perfonns operating system functions, and of Application Software (ASW). The...

Het gebruik van case tools bij de ontwikkeling van on-board ruimtevaartprogrammatuur

Bij het ontwikkelen van de standregelprogrammatuur voor de Italiaanse satelliet SAX is gebruik gemaakt van een aantal CASE tools. Naast een beschrijving van de standregelprogrammatuur, met als hoofdeisen een hoge mate van bedrijfszekerheid en een hoge flexibiliteit, worden de ontwikkelsituatie en de ontwikkelomgeving beschreven. Geschetst wordt...

The development of flexible sotfware for the Italian/Dutch satellite SAX : Advantages and disadvantages of the use of CASE tools

The Italian/Dutch satellite SAX is a scientific satellite which has the mission to study röntgen sources. One main requirement for the Attitude and Orbit Control Subsystem (AOCS) is to achieve and maintain a stable accuracy with a limit cycle of less than 90 arcsec during pointings of maximal 28 hours. The main SAX instrument, the Narrow Field...

Study on NAVSAT system evaluation, final report on phase 2. Part 1. Study results

Under contract to ESA, NLR has developed a flexible simulation package, named PROMISE, and a set of simulation models of the ESA proposed NAVSAT satellite-based navigation system. These were completed in 1984. In a continuation contract, described in this report, a number of extensions have been developed and implemented, and a number of...

Study on NAVSAT system evaluation, final report on phase 2. Part 2. Detailed simulation results

Fatigue load measurements and evaluation of the 25 m hawt at Petten, the Netherlands

Load measurements on the 25 m. Horizontal Axis Wind Turbine (HAWT) have been carried out to establish fatigue load spectra for 7 load channels in 9 modes of operation, i.e. 7 wind speed classes and the start and stop at the cutout wind speed. Special attention has been paid to the location of the zero levels for the different recordings. The...

A simulation tool for the study of satellite based navigation systems

Reliability aspects of software for digital avionics

Modern commercial transport aircraft contain digital avionics systems for more and more safety critical functions. The reliability and safety of those new systems depend on the hardware reliability and on the reliability of the embedded software. In this report, an overview is given of available methods and techniques to develop reliable...

A software-cost database for the development of aerospace software

Cost estimation of software development and control of the cost dioring the development are difficult due to the lack of an accurate cost estimation and management method. For the development of such a method cost figures from previous projects are needed and these are not readily available. In order to improve this situation, a user-friendly...

A software-cost database for aerospace software development

Cost estimation of software development and control of the cost during the development are difficult due to the lack of applicable cost figures from previous projects, and consequently due to the lack of an accurate cost estimation and management method. In order to improve this situation, a user-friendly method for the collection, storage and...

Functional requirements for a software cost database

Cost estimation of software development and control of the cost during the development, are difficult due to the lack of useful cost figures from previous projects, and consequently due to the lack of an accurate cost estimation and management method. This report describes the results of the first phase of a study to develop a software cost...