Saab AB

About: Saab AB is a company organization based out in Thun, Switzerland. It is known for research contribution in the topics: Antenna (radio) & Signal. The organization has 862 authors who have published 928 publications receiving 8807 citations. The organization is also known as: Saab AB & Svenska Aeroplan AB.

Particle Filtering Approach for Data Association

Abstract: An initial work has been performed to implement a sequential Monte Carlo method to solve the data association problem. The main motivation is to overcome the incorrect association when the state estimates are inaccurate. The solution is based on modeling the data association as a stochastic variable and estimated with a bootstrap particle filter. Two variants of the proposal function are evaluated, one with the uniform distribution over possible associations, and the other one with the distribution depending on the measurements and state estimates. The performance of both proposals is evaluated on the small simulation example, and compared to a purely deterministic approach, Nearest-Neighbour, as well. The obtained initial results are quite promising, and more evaluation and expansion to more examples and real data sets is suggested for the future work.

Method and arrangement for protecting a trusted network

Abstract: The invention further relates to a security arrangement (30) in a first end terminal (10), connected to a first network (40), for protecting against accidental breach of classified data to a second network (60). The security arrangement (30) is configured to receive a request to transmit real-time communication data (35) to a second end terminal (61) in a second network (60) and retrieve a security classification level for the second network (60). If the second network (60) has a lower security classification level than said first network (40), said security arrangement (30) is further configured to establish an inverse tunnel (100) from the first end terminal (10) to a trusted gateway (50) interconnecting the first network (40) and the second network (60). Said security arrangement (30) is further configured to receive realtime source data (13) generated by a communication means (1) and media stream data (23) comprising header data and payload data generated by a media application (20), wherein said real-time source data (12) is used to generate said media stream data (23) in said media application (20). Yet further, said security arrangement (30) is further configured to create real-time communication data (35) by replacing the payload data in said media stream data (23) with said real-time source data (13), said real-time communication data (35) comprising header data from said media stream data (23) and payload data from said real-time source data (13). Finally, said security arrangement (30) is further configured to transmit said real-time communication (35) data through the inverse tunnel (100). The invention further relates to a method in a first end terminal (10), connected to a first network (40), for protecting against accidental breach of classified data to a second network (60).

Method of manufacture of fillets for aircraft assemblies or the like and a forming device

Abstract: A forming device and a method of manufacture of a fillet of plastic for aircraft assemblies. The fillet has a pre-determined profile for filling a cavity of a structural element. The fillet is formed using a former of a forming device. The method includes applying at least one blank of a base material of plastic between at least two opposed press beds of the former and at least one of the press beds including an elongated groove. At least one press bed is towards another press bed, until the press beds are in position for completed compression of the fillet. Each groove for forming of the fillet generates a fillet in correspondence with the pre-determined profile. The press beds are separated from each other for releasing the formed fillet. The formed fillet is removed from the former. The formed fillet is applied in the cavity.

Method and a system for estimating the geographic position of a target

Abstract: The invention concerns a system (100) and a method for estimating the geographic position of a target (1). The method comprises the following steps: detecting a target (1); determining the characteristics of the target (1), which characteristics at least comprise a geographic position (3) and a category of the target; tracking the detected target (1) until at least one certain predetermined criteria is not fulfilled, wherein said criteria is associated to the level of certainty for determining the geographic position (3) of the target (1). The method further comprises determining a first point in time t1 when the predetermined criteria was last fulfilled, wherein, for a second point in time t2 the following step is performed: creating a pattern (2) defining at least one possible geographic position (3) of the target (1), said pattern (2) extends at least partially around the geographic position (3) of the target (1) at t1, wherein the dimension of said pattern (2) is determined based on at least one predetermined parameter.

Variable-geometry convergent-divergent exhaust nozzle for a jet engine and method for varying the nozzle

Abstract: The present invention relates to a variable convergent-divergent exhaust nozzle (14) for a jet engine (1) comprising a fixed structure (16), a first cross sectional area (Al), a second cross sectional area (A2), a plurality of first flap means (18) being pivotally connectable to the fixed structure (16), a plurality of second flap means (18') being pivotally connected to the plurality of first flap means (18), first actuator means (20, 20h, 24) being arranged to actuate said first flap means (18) for variation of the nozzles (14) first cross sectional area (Al) between a first position and a second position, and second actuator means (20', 20 'h, 24') being arranged to actuate said second flap means (18') for variation of the nozzles (14) second cross sectional area (A2) between a first position and a second position. The respective first flap means (18, 24, 26) comprises third flap means (24) and fourth flap means (26), each comprising a first sliding surface (22, 22') arranged in continuous contact with adjacent first flap means (18) during said variation. The respective second flap means (18') comprises fifth flap means (24') and sixth flap means (26'), each comprising a second sliding surface (22''', 22''''') arranged in continuous contact with adjacent second flap means (18') during said variation. The present invention also relates to method for varying a variable convergent-divergent exhaust nozzle (14) for a jet engine (1).