scispace - formally typeset
Search or ask a question
Institution

Saab Automobile AB

About: Saab Automobile AB is a based out in . It is known for research contribution in the topics: Radar & Antenna (radio). The organization has 760 authors who have published 890 publications receiving 11811 citations.


Papers
More filters
Proceedings ArticleDOI
01 Mar 2008
TL;DR: In this article, the appropriateness of initial preventive maintenance task intervals and the improvement of changed intervals are evaluated based on logic found in the RCM (Reliability-Centered Maintenance) methodology.
Abstract: In this paper the appropriateness of initial preventive maintenance task intervals and the improvement of changed intervals are evaluated. The evaluation criteria are partly derived from logic found in the RCM (Reliability-Centered Maintenance) methodology. Empirical data is related to the whole life cycle of the Swedish military aircraft system FPL 37 Viggen, from 1977 to 2006. The analysis shows that the maintenance intervals are partly appropriate and that some performed changes are improvements. These conclusions are strengthened if the phase-out of the aircraft system is considered, where the preventive maintenance strategy has been replaced with a corrective one, in order to achieve cost-effectiveness. Considering the perfect repair assumption, it seems that the overhaul tasks essentially bring the items back to a state as good as new. The performed evaluation mostly considers when the failures are recognized, i.e. during operation or during maintenance. Hence, aspects such as item accessibility, personnel skill levels, and maintenance task intervals for other items are not included in the evaluation.

5 citations

Proceedings ArticleDOI
13 Aug 1997
TL;DR: A multispectral imaging MWIR sensor developed by us utilizes the high frame rate made possible by modern FPA arrays and has the capability to perform two point correction in real time, thereby compensating for the different dynamic ranges in each spectral band.
Abstract: There is a trend today towards a reduction in target signatures, the signatures becoming increasingly adapted to the background in which the targets operate. In addition, new types of countermeasures are making the task for optical seekers increasingly difficult. One way to increase the capability of detecting low-signature targets in a countermeasure environment is to utilize not only the magnitude of the signature but also its distribution over the spectrum. For collection of information regarding the spectral signatures of targets, countermeasures and backgrounds, a multispectral imaging MWIR sensor has been developed by us. This device utilizes the high frame rate made possible by modern FPA arrays. Such an array has been combined with a rapidly rotating filter wheel, thereby producing images of 128 by 128 pixels in six wavelength bands in the 2 - 5 micrometer region at a frame rate exceeding 30 Hz in each band. The sensor has a field-of-view of 3.7 degrees and a pixel resolution of 0.5 mrad. The sensor has the capability to perform two point correction in real time, thereby compensating for the different dynamic ranges in each spectral band. An extensive measurement program is in progress for gathering data for targets, countermeasures and backgrounds. Selected results from this program are presented.

5 citations

Patent
11 Feb 2011
TL;DR: In this paper, the authors proposed a method for measuring isolation of an electrical system in a vehicle, the system comprising an AC/DC inverter (2), an AC motor (3), and an energy storage system (1), the ESS having a positive bus (16) and a negative bus (17) connectable to a first and second terminal (4, 5) of the DC-side of the inverter, respectively, a charging resistor (25), connectable in series with ESS during charging of a capacitance (30), and a discharge resistor (26
Abstract: A method for measuring isolation of an electrical system in a vehicle, the system comprising an AC/DC inverter (2), an AC motor (3), and an energy storage system (1), the ESS having a positive bus (16) and a negative bus (17) connectable to a first and second terminal (4, 5) of the DC-side of the inverter, respectively, a charging resistor (25), connectable in series with the ESS during charging of a capacitance (30) of the inverter, and a discharge resistor (26) connectable between said first and second terminals for discharge of said capacitance (30). The method comprises connecting said discharge resistor (26) between said first and second terminals (4, 5), connecting one bus (16 or 17) of said ESS to one of said first and second terminals (4, 5), and conducting an isolation measurement of said ESS. According to this method, an isolation measurement can be performed for the entire electrical system, i.e. the energy storage system, the motor, and the inverter, also before system start-up and post drive, i.e. when the inverter is deactivated and not in high voltage mode.

5 citations

Proceedings ArticleDOI
H. Berg1, Heiko Thiesies1, E. Hemmendorff1, G. Sidiropoulos2, J. Hedman1 
01 Oct 2008
TL;DR: In this article, phase and amplitude controlling ICs realized in a low cost standard silicon process are demonstrated and the design of several ICs at S-, C- and X-band has shown that silicon germanium is a strong contender to gallium arsenide where lowest noise figure is not vital.
Abstract: Phase and amplitude controlling ICs realized in a low cost standard silicon process are demonstrated. The design of several ICs at S-, C- and X-band has shown that silicon germanium is a strong contender to gallium arsenide where lowest noise figure is not vital. This applies also to the T/R-modules suited for military AESA-radars. The circuits presented in this paper are manufactured by austriamicrosystems in their 0.35 mum SiGe-BiCMOS process with an fT of 70 GHz.

5 citations

Proceedings Article
19 Jun 2013
TL;DR: In this paper, a comparison of some fundamental parameters of active radars used nowadays widely as sources of information on situation in the air space used for air traffic control or defense systems with parameters achieved by passive radars (PCL) is presented.
Abstract: Passive radars have some renown advantages when used as sources of information for air surveillance and air space control systems. Their main advantage is a concealed operation due to the usage of signals of opportunity and especially signals emitted by commercial broadcasting stations. Many parameters of the passive radars and namely: resolution and estimation of air object coordinates depend on quality of captured signals. Some examples of range resolution achieved using UHF radio and TV broadcasting signals as given in the enclosed references are discussed.. The range uncertainty is explained and its influence on range estimation accuracy is indicated. The influence of air coverage volume on the number and localization of emitters has been explained. A comparison of some fundamental parameters of active radars used nowadays widely as sources of information on situation in the air space used for air traffic control or defense systems with parameters achieved by passive radars (PCL) is then presented. Conclusion resulting from the discussion of both active and passive radars features is that passive radars do not match several of temporary requirements obligatory for the ATC or air defense systems and presently they are not able to replace active radars but can be used only as a supporting sources of information, which can improve the active radar coverage for small RCS objects (“stealth”) and also improve low altitude detection.

5 citations


Authors

Showing all 760 results

NameH-indexPapersCitations
Christer Larsson6427212916
Björn Johansson6263716030
David C. Viano482328283
Thomas Schiex4713811031
Robin Hanson281143519
Per Lötstedt281092960
Brigitte Mangin26482652
Lars Hanson191171138
Carl Gustafson17341035
Magnus Carlsson1637808
Per-Johan Nordlund14262738
David Allouche1426680
Mark A. Saab13161153
Andreas Gällström1334402
Hans Hellsten1237549
Network Information
Related Institutions (5)
Langley Research Center
37.6K papers, 821.6K citations

80% related

Ames Research Center
35.8K papers, 1.3M citations

78% related

Georgia Institute of Technology
119K papers, 4.6M citations

78% related

Polytechnic University of Milan
58.4K papers, 1.2M citations

78% related

United States Naval Research Laboratory
45.4K papers, 1.5M citations

78% related

Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202123
202019
201925
201830
201727
201633