R&S®DDF1GTX High-Speed Scanning HF Direction Finder

Extremely fast and accurate direction finding

Overview
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Key facts

Fastest DF measurement speed thanks to N-channel architecture and 30 MHz realtime bandwidth
Superior DF accuracy, sensitivity and immunity to reflections due to N-channel architecture with parallel sampling of all antenna elements and 30 MHz realtime bandwith

Brief description

Features & Benefits

Fastest scan speed and highest probability of intercept
Exceptionally high detection sensitivity
Wideband super-resolution

Specifications

R&S^®DDF1GTX specifications in brief
Frequency range	base unit	300 kHz to 30 MHz
Realtime bandwith	adjustable	up to 30 MHz

Key facts

Fastest DF measurement speed thanks to N-channel architecture and 30 MHz realtime bandwidth
Superior DF accuracy, sensitivity and immunity to reflections due to N-channel architecture with parallel sampling of all antenna elements and 30 MHz realtime bandwith
Maximum sensitivity and suppression of co-channel interference in receive mode using the optional beamforming
Super-resolution DF method (optional)
Complies with all relevant ITU recommendations; ITU-compliant measurements available as an option

Brief description

The R&S^®DDF1GTX high-speed scanning HF direction finder allows parallel direction finding of all signals across the entire HF range, ensuring the fastest speed while delivering outstanding DF accuracy, sensitivity and immunity to reflections. The optional super-resolution DF method in conjunction with the optional beamforming ¹⁾ makes the direction finder ideal for complex signal scenarios.

¹⁾ Available on request.

Features & Benefits

Fastest scan speed and highest probability of intercept
- N-channel architecture with 9 coherent receive channels
- 30 MHz realtime bandwidth
- Parallel measurement of all signals across the HF range in just one test step
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
- High immunity to strong signals thanks to sophisticated preselection
- Superior frequency accuracy and stability
Innovative DF antenna technology
- Extra-large antenna aperture
- Connection to non Rohde & Schwarz HF DF antennas
- Active/passive switchover with just one mouse click
Exceptionally high detection sensitivity
- Particularly low digital inherent noise through use of high bit depth in digital signal processing
- Particularly high adjustable channel resolution
Accurate and reliable location of short-duration signals
- Synchronization of multiple R&S^®DDF1GTX for time-synchronized DF scan mode
- Integrated GPS module as a high-precision time and frequency reference
- Optional preclassifier for detecting LPI signals and summarizing individual DF results into a condensed result
Wideband super-resolution
- Direction finding for co-channel signals
- Optional wideband super-resolution
- Maximum performance
Effective measurements in line with ITU recommendations
- Option for ITU-compliant measurements on signal parameters for AM, FM and PM-modulated signals
Signal analysis in parallel with direction finding
- Output of I/Q data for parallel signal analysis with R&S^®CA120

Specifications

R&S^®DDF1GTX specifications in brief
Frequency range	base unit	300 kHz to 30 MHz
DF method	base unit	correlative interferometer (CI mode)
	with R&S^®DDFGTX-SR option	wideband super-resolution (SR mode)
Number of coherent measurement channels		10
Instrument DF accuracy		typ. 0.2° RMS
System DF accuracy¹⁾	with R&S^®ADD011SRX (model .1x)	typ. 0.5° RMS
Realtime bandwith	adjustable	up to 30 MHz
DF sensitivity		on request
Instrument DF sensitivity	100 Hz channel spacing, 2 MHz	typ. -147 dBm
DF scan speed²⁾	100% channel occupancy, CI mode, normal selectivity, in line with Report ITU-R SM.2125
	1.25 kHz channel spacing	> 35 GHz/s
Processing speed²⁾	CI mode	up to 28 000 000 channels/s
Minimum signal duration	for single burst signal, 95% POI, normal selectivity, in line with Report ITU-R SM.2125	40 µs
Preselection	highpass/lowpass filters per measurement channel	10, switchable
Frequency resolution (channel spacing)	adjustable, depends on realtime bandwidth setting	up to 10 Hz
Dynamic range	depends on realtime bandwidth and channel spacing setting (incl. AGC)	up to 173 dB

¹⁾ Measurement in reflection-free environment. The RMS error is calculated from the bearings of evenly distributed samples versus azimuth and the frequency according to ITU-R SM 2125.

²⁾ DF scan range narrower than realtime bandwidth.

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