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A Parametric Model of the Ionospheric Electron Density Profile for JORN

This technical note describes how to interpret those parameters to produce an electron density profile at any place and time by defining the ten parameters in use, and the rules used to construct six quasi-parabolic segments (QPS) that combine to produce a robust, complete, and flexible representation of the overhead electron density profile, eN(z).

High Range Resolution Backscatter Sounder Ionograms

This paper describes methods used for high range resolution processing (6.1 km for 3 frequencies per 100 kHz) of the same raw data including superior radio frequency interference rejection.

Visualising Uncertainty for Decision Support

This report presents an overview of the theoretical concepts and definitions of uncertainty, and the uncertainty visualisation techniques that have been investigated to date.

Small satellites

Dr David Lingard discusses the 'Buccaneer' mission, one of DST's small satellite projects.

Wide Area Surveillance Activity Based Intelligence

Under a project known as WASABI (Wide Area Surveillance Activity Based Intelligence), DST Group is leveraging extensive experience with motion imagery to research wide area surveillance capabilities which contain vast amounts of unstructured information.

Implementation of the Scale Invariant Feature Transform Algorithm in MATLAB®

This report addresses the description and MATLAB implementation of the Scale-Invariant Feature Transform (SIFT) algorithm for the detection of points of interest in a grey-scale mage.

Sparse Reconstruction of a Scene and Camera Poses from the Scene Images with MATLAB®

This report addresses the description and implementation of numerical algorithms for the reconstruction of world points representing a scene, and pinhole camera poses from the scene images.

Optoelectronic Assessment of the Estimote Location Beacon

The Estimote Location BeaconTM is the latest addition to the Hybrid.Beacon DST Group project. This Technical Note will focus on one of the Beacon’s sensors, its ambient light capability.

Changing Coordinates in the Context of Orbital Mechanics

This note works through an example of switching between many coordinate systems using a modern matrix language that lends itself to describing arenas with multiple entities such as found in many Defence scenarios.

Signal Separation Of Helicopter Radar Returns Using Wavelet-Based Sparse Signal Optimisation

A novel wavelet-based sparse signal representation technique is used to separate the main and tail rotor blade components of a helicopter from the composite radar returns. The received signal consists of returns from the rotating main and tail rotor blades, the helicopter body, possible land or sea clutter, and other residual components, which may all overlap in time and frequency; and therefore conventional time and frequency separation techniques cannot be applied. A sparse signal representation technique is now proposed for this problem with the tunable Q wavelet transform used as the dictionary. The proposed algorithm is demonstrated using both simulated and real radar data (X and Ku-band), and is capable of extracting the components of interest successfully.

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