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Navigation satellites are known to cause bursts of Radio Frequency Interference in some
AKSAP observations, as they transmit in bands that lie in ASKAPs 700 -- 1800 MHz band.
To evaluate the situation, we plotted the satellite
passes within 10 degrees of an ASKAP beam during a 10-hour observation
on 2019-09-25. The satellites shown here belong to four navigation
constellations: GPS, GLONASS, GALILEO and BEIDOU. The size of an ASKAP
beam was set to 1.5 degree. As illustrated in the plot, three
satellites entered the beam, leading to two bright RFI bursts in ASKAP
observations (one of the satellites was decommissioned). This plot
also shows that for multi-hour observations covering satellite band,
it is difficult to find a schedule/pointing to fully avoid satellite
RFI, because of the large the number of navigation satellites in orbit.
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