R&S®DDF255 Digital Direction Finder

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

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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

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 GNSS 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 GNSS synchronization of frequency and time
- Synchronization of receiver frequency and time using the R&S^®DDF255IGT2 internal GNSS 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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