R&S®DDF550 Wideband Direction Finder

Fast and precise direction finding

Key Facts

  • High DF accuracy, sensitivity and immunity to reflections
  • High DF scan speed due to outstanding 80 MHz realtime bandwidth (VHF/UHF/SHF)

Brief Description

The fast R&S®DDF550 wideband direction finder offers outstanding realtime bandwidth and DF scan speed as well as high DF accuracy, sensitivity and immunity to reflections.

Features & Benefits

  • Direction finding of short-duration signals with high probability of intercept
  • Reliable DF results even in challenging environments

Specifications

Models Frequency range
base unit 20 MHz to 6 GHz
base unit with R&S®DDF550-HF option2) 300 kHz to 6 GHz

Key Facts

  • High DF accuracy, sensitivity and immunity to reflections
  • High DF scan speed due to outstanding 80 MHz realtime bandwidth (VHF/UHF/SHF)
  • Easy integration into mobile platforms due to compact size and optional DC power supply
  • DF antennas with integrated, extendible lightning protection causing no impairment of DF accuracy
  • Direction finding of signals in the frequency range up to 6 GHz

Brief Description

The fast R&S®DDF550 wideband direction finder offers outstanding realtime bandwidth and DF scan speed as well as high DF accuracy, sensitivity and immunity to reflections. The unit has compact dimensions and is optionally available as a DC-powered model, which makes it ideal for mobile applications.

Features & Benefits

  • Direction finding of short-duration signals with high probability of intercept
    • High DF scan speed due to outstanding 80 MHz realtime bandwidth
    • Direction finding of short-duration and frequency agile signals with high probability of intercept
    • Enhanced measurement speed (option)
  • Reliable DF results even in challenging environments
    • Higher immunity to reflections due to DF antennas with a very large number of antenna elements (VHF/UHF/SHF)
    • Stable bearings in VHF/UHF/SHF range even with a 50 % share of reflections
  • Innovative DF antennas
    • Active/passive switchover with just a mouse click
    • Exceptionally high DF sensitivity
    • Integrated, extendible lightning protection
    • Easy replacement of DF antennas
  • Precise direction finding of weak signals
    • High DF sensitivity due to large number of antenna elements
    • Adjustable coherent signal integration in wideband DF and DF scan mode for enhanced DF sensitivity
  • Accurate and reliable location of short-duration signals
    • GPS based synchronization of multiple R&S®DDF550 (time-synchronized DF scan mode)
    • Optional preclassifier detects LPI signals and summarizes individual results into a condensed result
  • Special and exceptionally powerful receive path for signal measurement
    • Special and exceptionally powerful receive path
    • Improved analog architecture of the receive path
    • Especially powerful analog/digital converters
    • Considerable advantages in the case of weak signals and dense signal scenarios
  • Powerful hardware developed by Rohde & Schwarz
    • In-house development and manufacture of all DF system components, including the DF antenna
    • Signal processing at maximum speed based on powerful FPGAs
    • Use of powerful Rohde & Schwarz ASICs
    • High immunity to strong signals thanks to sophisticated preselection
  • Effective measurements in line with ITU recommendations

    The R&S®DDF550 fulfills all ITU recommendations for direction finders and receivers:

    • Option for comprehensive, ITU-compliant measurement methods including, for example:
      • Frequency and frequency offset, field strength, modulation, spectrum occupancy and bandwidth
  • Direction finding up to 6 GHz
    • Fast, effective radiolocation of interferers

Specifications

Frequency range
  base unit 20 MHz to 6 GHz
  with R&S®DDF550-HF, receive option 8 kHz to 6 GHz
  with R&S®DDF550-HF2, DF option 300 kHz to 6 GHz
DF mode
DF method VHF/UHF/SHF correlative interferometer
  HF Watson-Watt
Realtime bandwidth VHF/UHF/SHF 80 MHz
  HF 20 MHz
Instrument DF accuracy   ≤ 0.2° RMS (typ.)
System DF accuracy1) depends on DF antenna (i.e. R&S®ADD011SR (.1x), R&S®ADD050SR, R&S®ADD153SR and R&S®ADD078SR), in reflection-free environment, with lightning protection, in line with report ITU-R SM 2125
     300 kHz to 1300 MHz    0.5° RMS (typ.)
     1.3 GHz to 6 GHz    1° RMS (typ.)
DF sensitivity depends on DF antenna, for 2º RMS DF fluctuation, 2 s integration time and 250 Hz (HF)/ 600 Hz (VHF/UHF/SHF) DF bandwidth (i.e. R&S®ADD011SR (.1x), R&S®ADD050SR, R&S®ADD153SR and R&S®ADD078SR), in line with report ITU-R SM 2125
     300 kHz to 30 MHz    0.7 μV/m (typ.)
     20 MHz to 6 GHz    3 μV/m to 20 μV/m (typ.)
Minimum signal duration   1 ms
  with R&S®DDF550-EMS2) option 0.5 ms
Minimum burst duration for multiple burst emissions 20 μs
DF scan speed    
HF (1.25 kHz channel resolution, 100 % channel occupancy Watson-Watt method, wideband fixed frequency mode) base unit > 1 GHz/s, in line with report ITU-R SM.2125
VHF/UHF (25 kHz channel resolution, 100 % channel occupancy correlative interferometer method, wideband fixed frequency mode) base unit > 40 GHz/s, in line with report ITU-R SM.2125

1) Measurement in reflection-free environment. The RMS error is calculated from the bearings of evenly distributed samples versus azimuth and frequency.

2) The R&S®DDF550-EMS option is export restricted.

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