R&S®DDF255 Digital Direction Finder

Accurate direction finding with measurement and analysis capabilities in a single unit

Key Facts

  • Tried and tested DF method used by 24 regulatory authorities worldwide
  • High-precision DF method at an excellent price/performance ratio (patented method)

Brief Description

The R&S®DDF255 combines the extremely powerful R&S®ESMD wideband monitoring receiver with the accurate correlative interferometer DF method. This combination yields a high-precision wideband direction finder featuring extensive measurement and analysis functions.

Features

  • Extended applications
  • Effective measurements in line with ITU recommendations
  • Wideband direction finding with realtime bandwidth of up to 20 MHz

Specifications

Base unit Frequency range
receive mode

 

20 MHz to 3.6 GHz

 

DF mode

 

20 MHz to 3 GHz

 

Key Facts

  • Tried and tested DF method used by 24 regulatory authorities worldwide
  • High-precision DF method at an excellent price/performance ratio (patented method)
  • Reliable DF results even in difficult environments (e.g. urban areas with up to 50 % reflection)
  • Direction finding of signals in the frequency range up to 8.2 GHz
  • Detection of extremely short emissions at unknown frequencies due to high-speed panorama scan (optional)
  • Measurement methods in line with ITU recommendations (optional)
  • Realtime event capture (REC) for I/Q recordings and realtime replay (optional)

Brief Description

The R&S®DDF255 combines the extremely powerful R&S®ESMD wideband monitoring receiver with the accurate correlative interferometer DF method. This combination yields a high-precision wideband direction finder featuring extensive measurement and analysis functions. With its high integration density and optional DC power supply, the R&S®DDF255 is also ideal for mobile applications.

Features & Benefits

  • Extended applications
    • Fast direction finding and spectrum monitoring, analysis and demodulation of wideband signals
    • Parallel monitoring and demodulation of one plus four signals within realtime bandwidth
    • Time domain analysis up to 20 MHz bandwidth with R&S®DDF255-ZS zero span option
  • Effective measurements in line with ITU recommendations

    The R&S®DDF255 fulfills all ITU recommendations for monitoring direction finders and receivers.

    • Option for ITU-compliant measurements on signal parameters for AM, FM and PM-modulated signals (e.g. modulation index, occupied bandwidth and phase deviation)
    • Offline measurements on digitally modulated signals using the R&S®CA100IS software and suitable options (in line with ITU recommendation SM1600)
  • Wideband direction finding with realtime bandwidth of up to 20 MHz
    • Parallel determination of bearings of all transmitters within the realtime bandwidth
  • Fast and reliable radiolocation due to high DF accuracy
    • High-precision correlative interferometer DF method using multi-element DF antennas (VHF/UHF/SHF)
  • High-resolution IF spectrum
    • All spectrum details visible in DF mode
  • Direction finding up to 8.2 GHz
    • Fast, effective interference detection
  • Recording and replaying of up to 80 MHz wide I/Q data
    • Never miss an event: activation of recordings with flexible realtime event capture (REC)
    • Signals as received from an antenna: all receiver functions available when replaying I/Q data
    • Detailed display: replay of I/Q data with increased time resolution
    • Replay in realtime: realtime replay of recorded data in the receiver
  • Map display with GPS position
    • Map display of current direction finder location
    • Selectable display of recorded results (e.g. spectra) relative to a position
    • Map material based on OpenStreetMap (OSM)
    • For receivers with front panel operation or for external R&S®DDF255 GUI software
  • Hardware-accelerated multichannel signal processing
    • Multichannel signal detection and analysis in a networked system
    • Parallel multichannel output of more than 100 channels
    • Multichannel digital downconversion (DDC) signal extraction from the R&S®DDF255 realtime bandwidth with R&S®DDF255-DDCE and R&S®CA120FFP
    • Automatic detection of fi xed frequency and burst signals with R&S®DDF255-HRP and R&S®CA120DSC
    • Automatic detection of frequency agile short-time signals with R&S®DDF255-ST
  • TDOA ready with high-accuracy timestamps and GPS synchronization of frequency and time
    • Synchronization of receiver frequency and time using the R&S®DDF255-IGT internal GPS module
    • High-accuracy timestamps in I/Q baseband data stream for use in TDOA systems

Specifications

Frequency range, receive mode
base unit 20 MHz to 3.6 GHz
with R&S®DDF255-SHF option 20 MHz to 26.5 GHz
with R&S®DDF255-HF option 8 kHz to 3.6 GHz
Frequency range, DF mode
base unit 20 MHz to 3 GHz
with R&S®DDF255-SHF option 20 MHz to 8.2 GHz1)
with R&S®DDF255-HF option 300 kHz to 3 GHz
DF mode
DF method VHF/UHF/SHF correlative interferometer
  HF Watson-Watt
Instrument DF accuracy   0.5º RMS
System DF accuracy2) depends on DF antenna (i.e. R&S®ADD119, R&S®ADD196 and R&S®ADD075), in reflection-free environment, with lightning protection, in line with report ITU-R SM.2125 (limited
to one modulation type) and recommendation ITU-R SM.854
  300 kHz to 30 MHz ≤ 2°
  20 MHz to 80 MHz typ. 1° RMS
  80 MHz to 1.3 GHz typ. 0.5° RMS
  1.3 GHz to 8.2 GHz typ. 1° RMS
System DF sensitivity depends on DF antenna (i.e. R&S®ADD119, R&S®ADD196 and R&S®ADD075), for 5º RMS DF fluctuation, 5 s integration time and 250 Hz (HF)/600 Hz (VHF/UHF/SHF) DF bandwidth, in line with report ITU-R SM.2125
  300 kHz to 80 MHz typ. 14 μV/m to 4 μV/m
  80 MHz to 1.3 GHz typ. 1 μV/m
  1.3 GHz to 6 GHz typ. 2 μV/m
  6 GHz to 8.2 GHz typ. 3 μV/m to 14 μV/m
Realtime bandwidth for wideband direction finding   up to 20 MHz
Minimum signal duration for a single burst signal, in line with report ITU-R SM.2125
  VHF/UHF/SHF 1 ms
  HF 2 ms
Receive mode
Realtime bandwidth for analysis/demodulatio base unit up to 20 MHz
with R&S®DDF255-ADC2 and R&S®DDF255-WB
options
additionally 40 MHz and 80 MHz
Scan speed with R&S®DDF255-PS option up to 270 GHz/s
(in-band)
with R&S®DDF255-ADC2, R&S®DDF255-WB and
R&S®DDF255-PS options
up to 850 GHz/s
(in-band)
Minimum signal duration VHF/UHF/SHF 1 ms
HF 2 ms

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

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