DSTO Scientific Publications

A 4-8 GHz CMOS Active Balun using a Compensated Single-FET Topology

Author: Milner, L.
Issue Date: Dec-2008
Citation: Milner L.E., "A 4-8GHz CMOS Active Balun using a Compensated Single-FET Topology", in Microelectronics: Design, Technology, and Packaging III, proceedings of SPIE Vol. 6798.

Abstract

A single-FET active balun has been developed with a phase imbalance of less than +-1.5 degrees and amplitude imbalance less than +-0.6dB from 4 to 8 GHz using 0.25um silicon-on-sapphire CMOS. The source terminal of the transistor has been compensated with a shunt capacitance to ground and increased value for the source resistance. The compensation network has improved the phase imbalance by 29 degrees at 8 GHz. The circuit dissipates 15mW and is 260x300um including AC coupling capacitors

Direct relative orientation from 5 and 6 points

Author: Fulton, John R.
Issue Date: 4-Jun-2008
Citation: 14th Remote Sensing and Photogrammetry Conference, September, 2008

Abstract

This paper defines a new algorithm for 6-point direct relative orientation using Singular Value Decomposition (SVD) and a Grbner basis method. This new algorithm works with coplanar points. A new strategy to pick the correct solution from the multiple possible solutions using both a 5- and 6-point algorithm is then provided. A number of camera and target geometries are presented which are then used to test the performance of new direct relative orientation algorithms. The results for a number of 5- and 6-point and the classical relative orientation algorithms are then reported. This methodology can be used by other photogrammetry and computer vision researchers for testing new direct relative orientation algorithms.

Active control of low frequency hull radiated noise

Author: Pan, X.; Juniper, R.
Issue Date: Jun-2008
Citation: Journal of Sound and Vibration 313 (1-2), pp. 29-45, 2008

Abstract

A theoretical analysis of the active control of low-frequency radiated pressure from a finite cylindrical pressure hull is presented. The control action is implemented through a Tee-sectioned circumferential stiffener driven by a pair of PZT stack actuators. The actuators are located under the flange of the stiffener and are driven out of phase to produce a control moment. This paper examines the effects of control actions, both structurally and acoustically, for a control moment applied around the circumference of the hull. The model considered is a water-loaded finite stiffened cylindrical shell with rigid ends caps. One end of the shell is excited by an axial force while the other end is free. Control action is achieved by using the PZT actuators and stiffener to minimize the structural response and radiated pressure. It was found that the control system was capable of reducing by approximately two-thirds of the radiated pressure for the first three axial modes.

DIRCM technology trends

Author: Lancaster, D.G.
Issue Date: May-2008
Citation: Association of Old Crows International Symposium, 26-27 May, 2008, Adelaide, Australia

Case Study 2: The Australian experience in developing a Defence CMD&V capability

Author: Pitt, M.
Issue Date: May-2008
Citation: Association of Old Crows International Symposium, 26-27 May, 2008, Adelaide, Australia

RFIC channelised EW receivers

Author: Knight, G.; Milner, L.; Palazzi, C.; Parker, M.; Reinhold, O.
Issue Date: May-2008
Citation: Association of Old Crows International Symposium, 26-27 May, 2008, Adelaide, Australia

TAPA maritime EW experiment

Author: Schellhase, A.
Issue Date: May-2008
Citation: Association of Old Crows International Symposium, 26-27 May, 2008, Adelaide, Australia

Self-protection chaff modelling using the TRIREME simulation environment

Author: Jasinski, T.; Cooke, M.
Issue Date: May-2008
Citation: Association of Old Crows International Symposium, 26-27 May, 2008, Adelaide, Australia

Use of communications EW in a network centric warfare environment

Author: Coat, I.
Issue Date: May-2008
Citation: Association of Old Crows International Symposium, 26-27 May, 2008, Adelaide, Australia

A modelling and simulation tool for the prediction of electronic attack effectiveness

Author: Baldwinson, J.; Antipov, I.
Issue Date: May-2008
Citation: Association of Old Crows International Symposium, 26-27 May, 2008, Adelaide, Australia