WP10: Aperture synthesis imaging radar
The major activity of this Work Package is the determination of the optimum number of outlying passive phased array antennas and their optimum localisation (antenna configuration) in order to fulfil the imaging (across-beam) spatial resolution criteria of the Aperture Synthesis Imaging Radar (ASIR) technique, which is a major innovation of the EISCAT_3D radars. Close coordination will be maintained with WP2, which covers site selection, in order that the size and geometry of the required sites will be well understood.
Operational software for interferometric image inversion based on the prototype software worked out in the framework of the EISCAT_3D Design Study and using extended simulations will be produced in this Work Package. The software will be employed in the evaluation of candidate antenna configurations. Evaluations will be made of methods other than the Maximum Entropy Method (MEM) for image inversion, feasibility of electron temperature imaging in the ionosphere, and beam coding to improve the matching between the transmitting and receiving patterns used for imaging. Possible impact on other Work Packages (such as the beam-forming aspects of WP7 and WP11) will be analysed. The number and localization of the outlying antennas have a decisive impact on the choice of site for the main radar station, with a consequent interplay of technical and financial issues.
This Work Package contains the following activities:
- Development of software for the simulation of incoherent scatter signals, so that imaging algorithms can be tested using different configurations of the antenna arrays.
- Evaluation of different algorithms for image inversion to be used in the aperture synthesis data analysis.
- Determination of the optimum number of outlying passive phased array antennas and their optimum localisation (antenna configuration) in order to fulfil the imaging (across-beam) spatial resolutions of the Aperture Synthesis Imaging Radar (ASIR) technique.
- Development of operational software for interferometric image inversion, and its employment in the evaluation of candidate antenna configurations.
- Beam matching of the transmitting and receiving phased array antennas.
In addition to the normal travel costs, the project plan includes a consultancy cost of 4 k€, to allow an external consultant to visit the University of Tromsø in order to work with the team developing the radar imaging applications.