Fixed Means


Fixed Unattended Measuring Station


  • Station is intended for search, detection, measurement of parameters, direction finding, recording, technical analysis and classification of signals within HF, VHF, UHF and SHF ranges, as well as for localization of their emitters while operating as a part of automated spectrum monitoring systems.

Antenna systems of ARCHA-INM Station

Typical Configuration:

  • DF antenna system (operating frequency range 20-3000 MHz, simultaneous bandwidth 5 MHz)
  • ARGAMAK-IS Panoramic Field Strength Meter (simultaneous bandwidth up to 22 MHz, operating frequency range 0,009-3000 MHz, Certificate of Approval of Measuring Equipment Type No. 47238, certified measuring procedures), mast-mounted design:
  • Additional coherent trunk of signal reception and processing, providing for direction finding based on correlative interferometer
  • EFSU External Field Sensor Unit (omni-directional measuring antenna)
  • Mast
  • Controller with software for remote control
  • Thermostatic moister proof cabinet for installation of the equipment (external temperature range -20C+30C)
  • Operator's automated workstation (AWS) with SMO-PAI, SMO-STA, SMO-ASPD Software Packages.
  • ARC-GIS Geoinformation Server.
  • Backup power supply system with remote control (battery-run time of the Station's radio monitoring equipment is 2 hours minimum)
  • Communication and data transmission equipment.

Structural diagram of ARCHA-INM Station


  • Extension of operating frequency range in measuring mode up to 8000 MHz
  • Extension of operating frequency range in DF mode (1.5 – 3000 MHz)
  • Extension of simultaneous DF bandwidth up to 24 MHz
  • Extension of operating temperature range for outdoor operation: additional heat Insulation (down to -55C), conditioner (up to +55C)
  • External remote controlled ARC-KNV4 (3 - 18 GHz) Frequency Down-Converter for Measuring Equipment
  • Navigation and timing equipment GLONASS/GPS for location finding and synchronization of the stations when joint operating.
  • Equipment of back-up communication channel (2G/3G/4G modem)
  • SMO-BS Software Packages for Wireless Data Communication System Analysis: BS 3GPP (GSM, UMTS, LTE), BS CDMA (IS-95, cdma2000, EV-DO), BS TETRA, BS DECT, BS TRUNK (DMR, APCO P25)
  • SMO-CT Software Package for Digital TV Signal Analysis
  • SMO-PVP Cross Talk Detection Software Package


  • It meets the following ITU-R recommendations: SM.328, SM.377, SM.378, SM.443, SM 1047, SM 1050, SM.1139, SM 1268, SM 1370, SM 1392, SM 1537, SM 1600, SM 1682, SM 1836, SM 1837, SM 1838, SM 1840, SM 2039, SM 1880
  • It meets the requirements of Unified Technical Policy (ETP) of RF Federal Service for Supervision in the Sphere of Telecom, Information Technologies and Mass Communications concerning fixed radio monitoring systems
  • DF and measuring antenna systems are mounted on the same mast
  • Combined direction finding and measuring paths
  • To prevent overloading in complicated electromagnetic environment, digital radio receiver includes additional analogue path with 500 kHz bandwidth
  • ARGAMAK-IS is located close to antenna system, which allows avoiding antenna effect and provides high sensitivity and accuracy of direction finding
  • Power supply system, controller and communication equipment are placed inside thermostatted moisture protected cabinet that provide an ability of outdoor location
  • The distance between antenna system and location of controller unit can be up to 100 m
  • Joint operation of several stations, including being a part of ASMS (ARMADA, AREAL etc.)

Station provides:

  • Panoramic spectrum analysis within the entire operating frequency range or within separate intervals in complicated electromagnetic environment, accommodation to ambient radio environment and detection of its changes
  • Search for emission sources within selected frequency ranges, including frequency hopping signals
  • Plotting frequency-time diagram of loading within analyzed frequency ranges.
  • Signal parameter measurement
  • Field strength measurement
  • Automatic direction finding of radio emission sources with random modulation types and spectrum width in single-channel and multi-channel modes
  • Building of bearing panorama within operating frequency range
  • Real-time display of bearings, spectrum panorama, bearing history and signal amplitude history
  • Recording of radio emission spectrum
  • Recording of signal samples within the band up to 40 MHz
  • Technical analysis, including revealing of central frequency, signal type, modulation type, signal bandwidth
  • Detailed technical analysis (parsing of complicated signal-code structures, and analysis of transferred data bitstreams)
  • Check of frequency/time parameters and service information of base station of modern communication and data transmission systems (GSM, IS-95, cdma2000, EV-DO, UMTS, TETRA, DECT, LTE, DMR, APCO P25).
  • Measuring and monitoring of digital TV signal parameters (DVB-T/T2/H)
  • Automated radio monitoring based on preset schedule or under operator control
  • Automated control of equipment health
  • Remote control based on TCP/IP via wire and wireless communication channels
  • Review and processing of the data from DB
  • Mapping DB information on the electronic map
  • Generation of reports with radio monitoring and technical analysis results in Microsoft Office, OpenOffice, HTML and PDF file formats.

In case of joint operation, the stations provides in addition:

  • Interaction via wire and wireless channels
  • Assigning tasks on search, monitoring and direction finding from master unit to slave stations of the system
  • Transfer of radio monitoring data from slave stations to master station for further analysis and processing
  • Synchronization of all system stations based on GLONASS/GPS (when navigation timing equipment is available)
  • Synchronous direction finding of radio signal sources
  • Transmitter location evaluation based on direction finding data
  • Transmitter location evaluation based on time difference of arrival method (when navigation timing equipment is available).

Basic Technical Specifications of Station in Complete Configuration

Panoramic spectrum analysis and measuring
Operating frequency range 20 – 8000 MHz
Maximum simultaneous bandwidth 22 MHz
Intermodulation free dynamic range (3rd and 2nd order) 75 dB, min
Panoramic spectrum analysis rate up to 20 GHz/s
Detected signal minimum duration 1 s
Input radio signal level measurement limits 0 - +140 dBV
Error of Input radio signal level measurement 1 dB, max.
Error of field strength measurement 3 dB, max.
Error of sine signal frequency measurement max. 1×10-9
Bandwidth measurement error max. 5%
Relative error of occupancy measurement max. 1%
Single-Channel and Multi-Channel Direction Finding
DF method Correlative interferometer
Operating azimuth range 0° - 360°
Operating frequency range 1.5 – 3000 MHz
Simultaneous DF bandwidth Up to 22 MHz
Processed signal minimum duration 10 ms
Processed signal spectrum width Arbitrary
Multi-channel direction finding rate:
within 1.5-20 MHz range up to 10 MHz/s
within 20-3000 MHz range up to 2 500 MHz/s
DF field sensitivity, max.
within 1.5-20 MHz range 15 V/m (typical 10 V/m)
within 20-3000 MHz range 6 V/m (typical 2 V/m)
Instrument accuracy (RMS), max.
within 1.5-20 MHz range 5
within 20-3000 MHz range 2
Radio signal recording, and technical analysis
Max. recording bandwidth Up to 40 MHz
Continuous recording time Depends on the storage volume
General Parameters
Power consumption 1000 W, max.
Dimensions of uninterruptible power supply unit (W x D x H) 600 x 600 x 1500 mm, max.
Weight of uninterruptible power supply unit max. 80 kg
Dimensions of antenna system (diameter x height) 2005×2505 mm, max.
Weight of antenna system max. 40 kg
Operating temperature range -55C +55 C

Typical curve of RMS vs. frequency (MHz)

Typical curve of DF sensitivity (V/m) vs. frequency (MHz)

Fixed Means