R&S®DDF255 Digital ­ irection Finder D Accurate direction ­finding with measurement and analysis capabilities in a single unit

R&S®DDF255 Digital Direction Finder At a glance The R&S®DDF255 combines the new, 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. Due to the use of wide-aperture DF antennas and a very large number of antenna elements, the correlative inter­ ferometer DF method offers a high degree of accuracy...

R&S®DDF255 Digital Direction Finder Benefits and key features Extended ­applications ❙❙ Fast direction finding and spectrum monitoring, analysis and demodulation of wideband signals ▷▷ page 4 Effective measurements in line with ITU ­ recommendations The R&S®DDF255 fulfills all ITU recommendations for monitoring direction finders and receivers. ❙❙ Option for comprehensive, ITU-compliant ­ easurement m methods ▷▷ page 5 Wideband direction finding with ­ ealtime ­ r b ­ andwidth of up to 20 MHz ❙❙ Parallel determination of bearings of all transmitters ­ within the realtime bandwidth ▷▷ page 6 Fast...

Extended ­applications Fast direction finding and spectrum monitoring, analysis and demodulation of wideband signals Due to the extensive functionality of the R&S®ESMD digital wideband monitoring receiver, the R&S®DDF255 offers more standard features than a conventional direction f ­ inder. With the appropriate options, the R&S®DDF255 transforms into a complete, integrated solution for radiomonitoring and radiolocation. When controlled through a PC or laptop, the R&S®DDF255 offers the following capabilities, for example: ❙❙ Extremely fast spectrum monitoring with scan speeds of up to 100 GHz/s...

Effective ­measurements in line with ITU recommendations The R&S®DDF255 meets, and in many cases clearly surpasses, the ITU recommendations for monitoring direction finders and receivers. For example, the R&S®DDF255 receiver offers large-signal immunity clearly better than the minimum values recommended by the ITU (higher intercept points, lower phase noise). Option for comprehensive, ITU-compliant ­measurement methods As an option, the R&S®DDF255 can be furnished with comprehensive, ITU-compliant measurement methods. These include: ❙❙ Frequency and frequency offset in line with ITU-R SM.377 1)...

Wideband ­direction finding with ­realtime ­bandwidth of up to 20 MHz Parallel determination of bearings of all t ­ ransmitters within the realtime bandwidth By using high-speed signal processing, the R&S®DDF255 can take the bearings of all signals in a wide frequency range of up to 20 MHz with selectable resolution. For all signals above the level threshold, bearings are calculated in parallel and displayed. Wideband direction finding offers a variety of applications and benefits: ❙❙ All channels in the aeronautical or maritime frequency bands can be displayed and their bearings taken in parallel...

Fast and reliable r ­ adiolocation due to high DF ­ ccuracy a High-precision correlative interferometer DF ­ ethod using multi-element DF antennas m (VHF/UHF/SHF) In the VHF/UHF/SHF range, the R&S®DDF255 uses the correlative interferometer DF method (see page 12). In contrast to other direction finders using simple amplitude comparison methods, the R&S®DDF255 offers significantly higher DF accuracy up to class A in line with ITU recommendations. This high DF accuracy relies on the precise measurement of the phase angles between the reference antenna element and the other elements. Measuring the...

Direction finding up to 6 GHz Fast, effective interference detection Together with the new R&S®DDF255-SHF option and the R&S®ADD075 DF antenna, the R&S®DDF255 delivers precise DF results up to 6  GHz. Until now, this has been possible only up to 3 GHz. For the first time, bearings can now be taken on transmitters up to 6 GHz, for example in the frequency bands of the following services: ❙❙ WLAN ❙❙ WiMAX™ ❙❙ Microwave systems The R&S®DDF255 effectively detects interference in the corresponding frequency bands. Locating target transmitters previously required the use of rotatable directional antennas,...

Hardware-­ accelerated multichannel signal processing Multichannel digital downconversion (DDC) signal ­ extraction from the R&S®DDF255’s realtime b ­ andwidth with R&S®DDF255DDCE The R&S®DDF255 digital direction finder optionally provides hardware-accelerated signal processing for the R&S®GX435 multichannel signal analysis system. For this purpose, the R&S®DDF255 needs to be equipped with the R&S®DDF255-SP signal processing board. The board supports up to four different high-performance signal processing functions, implemented in field programmable gate array (FPGA) technology. If multiple signals...

Automatic detection of fixed frequency and burst signals with R&S®DDF255-DT Automatic detection of short-time signals ( ­hoppers) with R&S®DDF255-DS When used with R&S®GX435, the R&S®DDF255-DT ­ ption o delivers a result for each signal that is detected within the R&S®DDF255’s realtime bandwidth and matches user-­ defined selection criteria. When used with R&S®GX435, the R&S®DDF255-DS option delivers a result for each short-time signal that is detected within the R&S®DDF255's realtime bandwidth and matches user-defined selection criteria. The detection threshold automatically adapts to the noise...

signal analysis The R&S®GX435 multichannel signal analysis system per- forms multichannel automatic and manual processing of detected signals (product brochure: PD 5214.0582.12, data sheet: PD 5214.0582.22). The R&S®DDF255 comes with options to support these functions. These options are Detections Filter: [show classified detections only Center Freq. Det. Bandwidth Class. Bandwidth Symbol Rate With its automatic detection and classification capability, R&S*GX435 can monitor complete signal scenarios and informs the user about any signals Rohde&Schwarz R&S«DDF255 Digital Direction Finder 11