ASIAA Summer Student Program 2011
1 Jul. - 31 Aug., 2011 at ASIAA, Taipei
Understanding the instrumental bandpass feature in radio astronomical receiver system [Instrumentation and Engineering]
Dr. Chau-Ching Chiong
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Task Description and Goals• Modern radio astronomical receiver is a very complex system including antenna, amplifiers, mixers, and filters, before going into the correlator. These components affect the delay, phase, and spectral shape of the astronomical signals.
• In interferometry observation, accurate bandpass phase information in visibility data is critical. Typically, bandpass calibration towards strong astronomical source with a flat spectrum is performed before every session to remove the instrumentation effect. However, it is time-consuming and may limit the accuracy of the data.
• To solve this problem, in this project we would like to re-exam the signal path and to identity the key components in the system which affect the phase. We also want to try other alternatives to see if it can improve the accuracy of the conventional bandpass calibration.
Required BackgroundRequired Background
• Microwave engineering
• Circuit and Electro-magnetic simulation tools (HFSS, Sonnet, MWO, ADS etc.)
• Layout tools (AutoCAD etc.)