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RFI measurements at the WSRT. Hans van der Marel ASTRON RFI Mitigation workshop, Groningen, 29-31 March 2010. Introduction. Astronomical observations Local or non-local interference Spectrum monitoring station National Frequency allocation table Test observations for less known bands

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rfi measurements at the wsrt

RFI measurements at the WSRT

Hans van der Marel

ASTRON

RFI Mitigation workshop, Groningen, 29-31 March 2010

introduction
Introduction
  • Astronomical observations
    • Local or non-local interference
  • Spectrum monitoring station
  • National Frequency allocation table
  • Test observations for less known bands
  • Investigations for local interference
spectrum monitoring station
Spectrum monitoring station
  • Current station operational since 2005
    • Latest antenna modification December 2007
  • Continuous coverage 20 - 3000 MHz
  • Scanning 24/7
  • Calibrated data
  • Data in RMDF format
  • Analysis program available
  • Data available to CRAF
set up of monitor station
Set-up of Monitor Station

R&S HF902

R&S HK309

Roof of construction hall

Construction hall

coax

Antenna switch

coax

Control cable

coax

converter

R&S EB200 receiver

coax

UTP

Field

Main building

Control computer

Glass fiber

To ASTRON network

rohde schwarz eb200 miniport receiver
Rohde & Schwarz EB200 Miniport receiver
  • Frequency range 10 kHz - 3 GHz
  • Noise floor -117 dBm @ 30 kHz BW
  • Scan speed 126 points/s 20 - 3000 MHz in 13.5 min @ 30 kHz BW
rohde schwarz antennae
HK 309

Freq range: 20 - 1300 MHz

Passive

Linear polarization

HF 902

Freq range: 1 - 3 GHz

Passive

Linear Polarization (V used)

Rohde & Schwarz antennae
schematic of control program
Schematic of Control Program

Measurement module

Measurement

file

measure.dat

Calibration

files

*.dat

TCP/IP connection

EB 200 measurement receiver

investigations of local or internal interference
Investigations of local or internal interference
  • Usually in 1 or few telescopes
  • Malfunctioning equipment
    • E.g. oscillating amplifiers, leaking of LO
  • Interfering equipment
    • Computers, networks, lab equipment

Tools:

  • Handheld antennas, probes, spectrum analyzer, receiver
  • Experience
summary
Summary
  • Astronomical observations are inspected,they are the most sensitive
    • Autoplots give first indication
    • Reports from astronomers
  • Spectrum monitoring station gives indication about possible RFI
  • Test observations can reveal real usability of frequency band
  • Good relation with National Agency is important
  • Know your enemy (e.g. Galileo)
  • Local and internal interference requires continuous attention
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