Syd ATIS showed earlier in the day that ILS 16R wasn't available due testing so i would think that this was the aircraft conducting the tests.
Time gone by, the old Department of transport used to have an F28 with calibration equipment which used to do the same thing and it was real fun watching it conduct the ILS approach then break off at the last minute and climb out like a bat out of hell!
If I remember correctly there are a number of threads on this forum with details of exactly this subject.
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