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Radio Astronomy Spectrum Management in practice – Australia (ATNF)

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Presentation on theme: "Radio Astronomy Spectrum Management in practice – Australia (ATNF)"— Presentation transcript:

1 Radio Astronomy Spectrum Management in practice – Australia (ATNF)
Tasso Tzioumis Australia Telescope National Facility 10 June 2002

2 Tasso Tzioumis Greenback
Overview Radio telescopes in Australia RFI characterisation Measured spectra Computed spectra INTER Projects SKA radio-quiet reserve 3/12/2018 Tasso Tzioumis Greenback

3 Radio Telescopes in Australia
3/12/2018 Tasso Tzioumis Greenback

4 Tasso Tzioumis Greenback
ATCA RFI measurements April 1995, ATCA short baselines 20, 13, 5, 3 cm bands April 1997, 13 cm band 3/12/2018 Tasso Tzioumis Greenback

5 Tasso Tzioumis Greenback
20cm band April 1995 13cm band April 1995 3/12/2018 Tasso Tzioumis Greenback

6 Tasso Tzioumis Greenback
6cm band April 1995 3cm band April 1995 3/12/2018 Tasso Tzioumis Greenback

7 Tasso Tzioumis Greenback
13cm band April 1997 3/12/2018 Tasso Tzioumis Greenback

8 Tasso Tzioumis Greenback
13cm band April 1995 13cm band April 1997 3/12/2018 Tasso Tzioumis Greenback

9 Tasso Tzioumis Greenback
RFI Characterisation Predictions from ACA Database John Sarkissian, Parkes RF plots at each band, Integrated flux, RFI at each Oz telescope Includes satellite services where known 2nd and 3rd harmonics can be shown Interactive Interference Characterisation (INTER) 3/12/2018 Tasso Tzioumis Greenback

10 Tasso Tzioumis Greenback
Integrated Flux GHz 3/12/2018 Tasso Tzioumis Greenback

11 Tasso Tzioumis Greenback
RF Flux Distribution 3/12/2018 Tasso Tzioumis Greenback

12 RF Transmitters near Parkes
3/12/2018 Tasso Tzioumis Greenback

13 RFI monitoring and Mitigation
Parkes program (Mal Smith) Identify internal interference Screen observatory equipment Interference Monitoring System (IMS) Radiometer system sampler/correlator lower noise floor  dBW/m^2/Hz 3/12/2018 Tasso Tzioumis Greenback

14 Terrestrial Interference
Forte satellite: 131MHz 3/12/2018 Tasso Tzioumis Greenback FORTÉ satellite: MHz

15 Possible SKA configuration
3/12/2018 Tasso Tzioumis Greenback

16 SKA location Radio Quiet Reserve
3/12/2018 Tasso Tzioumis Greenback

17 Square-Kilometre Array Australia
Luneburg Lens All sky coverage multiple simultaneous beams Possible design 5-m spheres Each patch 100 m diameter 100s of patches 3/12/2018 Tasso Tzioumis Greenback

18 SKA Location WA Radio Quiet Reserve
RFI measurement system Funded by WA state government First results march-April 2001 MHz MHz Site comparison 2002 Noise floor > 30db ITU IMS under construction 3/12/2018 Tasso Tzioumis Greenback

19 RFI measurement equipment
Antenna LNA SpecAn RBW = 3kHz (100Hz) Determines band • Sensitivity determined by external noise Maximum gain used • Gain ~ 40 dB 3/12/2018 Tasso Tzioumis Greenback

20 Tasso Tzioumis Greenback
IMS Modified Multibeam sampler/correlator 1024 or 2048 channel autocorrelation Sampler: 2-bit, 3-level,128Msamp/sec, IF bandwidth 64 MHz Under testing Sensitivity: For G=8dBi, at 1400 MHz, Tsys=440K, 1024ch, 64 MHz BW, 5s integ., average  dBW/m^2/Hz 3/12/2018 Tasso Tzioumis Greenback

21 Tasso Tzioumis Greenback
Summary RFI characterisation at Australian telescopes Measured spectra Computed spectra – ACA database INTER – interactive characterisation Projects – monitoring and mitigation SKA radio-quiet reserve 3/12/2018 Tasso Tzioumis Greenback

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