IRCOS JSC

Technical Means for Radio Monitoring

Investigations - Design & Engineering - Manufacturing - Delivery - Maintenance

Direction Finders


This section presents the direction finders manufactured and supplies by the company. Their range includes fixed, mobile, transportable, portable and manpack designs. That make possible to choose appropriate type depending on application conditions.

Each of direction finders is a multi-functional tool, which provides not only for direction finding, but also for panoramic high-speed scan over entire frequency range or separated sub-ranges, automated monitoring of signal at separated frequencies, measuring of signal parameters, signal recording and technical analysis of radio signals.

Automatic direction finders includes digital radio receivers integrated with antenna systems. This feature enables high sensitivity and wide dynamic range, eliminates antenna effects and allows the use of very long flexible Ethernet lead-in cables.

All direction finders' parameters, including RMS and DF sensitivity, are measured based on standard test procedures given in Recommendations ITU-R SM.2060 and SM.2096. For each direction finder standard sensitivity is also specified being determined as its mean value within the frequency range for a group of products.

Direction finders operated as parts of fixed station allows remote control. Equipment is inside temperature controlled and moisture protected boxes and its placement does not require service premises. All equipment can be installed outdoors, e.g. on rooftop of building. Direction finders include an integrated diagnostics system of state and operation parameters of modules and units. Diagnostics results are transmitted on the basis of SNMP protocol. Remote control of direction finders through wire or wireless channels allows using them in automated spectrum monitoring systems.

To prevent overloading in complicated electromagnetic environment, digital radio receiver of direction finders includes additional analogue radio receiving path with narrow bandwidth in each receiving channel.

When a network of several direction finders is available, "hybrid" method of localizing radio emission sources can be implemented. In this case location of radio emission sources is calculated based on the integration of information: bearings, arrival time and radio signal levels.

Another key feature of fixed, mobile and transportable direction finders is the possibility of signal direction finding in short-wave range in HF range starting from 1.5 MHz. In the maximum configuration, the upper operating frequency of the direction finder is 8000 MHz.

Direction finders can include built-in automatic positioning system and determining the direction to the north.

DF error (RMS) of ARTIKUL-S doesn't exceed 1° within frequency range of 20-3000 MHz.

ARTIKUL-M1 Mobile Direction Finder based on correlative interferometry is designed for installation on a transport mean, for example on a car. Two-channel panoramic radio receiver (ARGAMAK) and navigation system is integrated inside the direction finding body. The direction finder can work in motion and at stop, controlled by automated system or in standalone mode. Even in stand-alone operation, the mobile direction finder provides localization of radio emission sources with high accuracy. DF error (RMS) doesn't exceed 1.5° within frequency range of 20-3000 MHz. There are two design options of the direction finder: quick-detachable and fixed. In case of quick-detachable design the direction finder is mounted in the vehicle's railings. In case of fixed design the direction finder is mounted on the vehicle roof under radome.

ARTIKUL-V1, ARTIKUL-V2, ARTIKUL-V3 Direction Finders are designed for installation to aircrafts. Small weight and dimensions of ARTIKUL-V1 Direction Finder makes possible to install it to small UAV, for example to unmanned helicopter. The direction finders includes remote control and communication systems, high efficient ARC-KNV3 Navigation System that provides not only for coordinates and course, but bank and pitch angles of the carrier as well.

ARTIKUL-T Transportable Automatic Direction Finder has the design very similar to ARTIKUL-S Direction Finder, but its operating frequency range is limited by 3000 MHz in order to decrease weight / dimensions and make easier transportation and deployment.

ARTIKUL-MT Transportable Direction Finder based on correlative interferometer principle, which has quite small weight and dimensions. ARTIKUL-MT is intended for monitoring of radio environment. It also uses ARGAMAK two-channel digital radio receiver installed into thermostatic waterproof case located right under the antenna system. With AS-HP-HF, AS-HP2, AS-HP5 replaceable antenna systems, DF operating frequency range is from 1.5 to 8000 MHz.

ARTIKUL-TAU2 Transportable Azimuth-Elevation Direction Finder provides for accurate finding of elevation and can be used for direction finding both ground and sky object, e.g. unmanned aircrafts with active control and data channel.

ARTIKUL-H1 is a manpack automatic broadband correlative interferometer direction finder. It is intended for mast-mounted and mobile operation. AS-HP-HF, AS-HP1, AS-HP2, and AS-HP5 replaceable antenna systems provide direction finding within operating frequency range from 1.5 to 8000 MHz. ARGAMAK-2K7 Two-Channel Radio Receiver is used as radio receiving unit. During work at a temporary stops the antenna system is mounted on an collapsible tripode. For mobile operation antenna system of the direction finder is mounted on the vehicle's roof with magnetic pad or radio transparent luggage box. Manpack operation mode is provided by special light frame with shoulder straps and belt, to which replaceable antenna system is mounted and ARGAMAK-2K7 Two-Channel Radio Receiver is attached.

For radiomonitoring and more accurate localization of radio emissions sources afield and inside the objects, ARC-RP3M Handheld Direction Finderis used. Apart from the panoramic spectrum analysis, detection and manual direction finding the direction finder performs identification and selective direction finding of GSM, DECT base and subscriber substations, Wi-Fi wireless devices. For field operation, the direction finder features a mode for automatic measurement of coordinates of the source for which bearings are taken and display of its position on the electronic map.



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