A Low Frequency Blind Survey of the Low Earth Orbit Environment using Non-Coherent Passive Radar with the Murchison Widefield Array

Abstract

We have extended our previous work to use the Murchison Widefield Array (MWA) as a non-coherent passive radar system in the FM frequency band, using terrestrial FM transmitters to illuminate objects in Low Earth Orbit LEO) and the MWA as the sensitive receiving element for the radar return. We have implemented a blind detection algorithm that searches for these reflected signals in difference images constructed using standard interferometric imaging techniques. From 20 hours of archived MWA observations, we conduct a survey of LEO, detecting 74 unique objects over multiple passes and demonstrating the MWA to be a valuable addition to the global Space Domain Awareness network. We detected objects with ranges up to 977 km and as small as 0.03 m^2 radar cross section. We found that 30 objects were either non-operational satellites or upper-stage rocket body debris. Additionally, we also detected FM reflections from Geminid meteors and aircraft flying over the MWA. Most of the detections of objects in LEO were found to lie within the parameter space predicted by previous feasibility studies, verifying the performance of the MWA for this application.

arXiv commentSubmitted to PASA

References in corpus (8)

• The NumPy array: a structure for efficient numerical computation
• The Low Earth Orbit Satellite Population and Impacts of the SpaceX Starlink Constellation
• An optimized algorithm for multi-scale wideband deconvolution of radio astronomical images
• On the Impact of Satellite Constellations on Astronomical Observations with ESO telescopes in the Visible and Infrared Domains
• Surveillance of Space using Passive Radar and the Murchison Widefield Array
• Quantifying Excess Power from Radio Frequency Interference in Epoch of Reionization Measurements
• Improved Techniques for the Surveillance of the Near Earth Space Environment with the Murchison Widefield Array
• The Development of Non-coherent Passive Radar Techniques for Space Situational Awareness with the Murchison Widefield Array

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