Features

 
 
  • Two simultaneously operating TX/RX channels:
    • high-speed OFDM channel (up to 40 Mbit/s);
    • noise-immune channel correlation based receive - CBA (up to 3 Mbit/s).
  • Long communication range (up to 100 km - 6 Mbit/s, more than 150 km – CBA 2 Mbit/s).
  • Ability to operate the CBA channel with presence of in-band interference up to a signal-to-noise ratio -3 dB.
  • Highly efficient ECC (turbo codes). Steady performance at 0.9 dB of Shannon limit.
  • Time division multiplexing (TDMA).
  • Light weight and small size
  • Tested on frequences for 3.4 GHz - 3.6 GHz, 5.9 GHz - 6.2 GHz.
  • Frequency range from 100 MHz to 6.3 GHz.
  • Possibility of making a «point-to-multipoint» communication scheme, using diversity technologies to increase the stability of radio communication.
  • Possibility of combining ground stations «into a single network» to organize a continuous communication channel when the onboard modem is connected to at least one ground modem.
  • Multi-beam antenna control (smart antennas or antenna arrays).
  • Suppression of the influence of reflected signals.
  • The lower, upper level, as well as the «hardware»" of the modem can be flexibly adapted to the requirements of the customer.
  • Possibility of determining direction and distance between communication points (accuracy up to 5 meters) without using GPS/GLONASS.
  • Completely its own lower level OFDM (IP-core Verilog).
  • Completely its own lower level CBA (CDMA-like signals) (IP-core Verilog).
  • Completely its own top level digital modem (ARM, gcc).
  • When using an antenna with a higher gain and/or more powerful radio module, the communication range can be raise up to 300 km or more.
  • Multipoint mode: providing low speed (up to 1Mbit/s) telemetry/control communication channels for more than 32 on-board modems simultaneously, combined with the allocation of a high-speed channel(ex: video stream at 8Mbit/s) for one of them.

Application examples

  • Point-to-point line-of-sight mode to create communication channel with UAV at long distance for control and transmission of HD video stream and high resolution photos.
  • The option of using a third modem as a repeater to create communication channel with a ground mobile object in complex conditions of rough terrain.
  • Option to use the communication system in no-line-of-sight conditions at distances up to 1 km for communication with a mobile object.
  • Point-to-multipoint mode for simultaneous data transfer between the ground control terminal and several UAVs.
  • Multiple antennas receive mode in conditions limited visibility.

Diversity reception

Diversity reception

Ground stations can be combined into a single network to provide continuous communication with a mobile object that moves along desired path over long distances.

The control server coordinates reception from several(up to hundreds) ground stations to provide continuous communication with a mobile object or objects. Server is implemented on Linux and can run on platforms that support this OS (PC, Raspbery Pi, etc.)

Ground stations constantly transmit(via the tcp/ip network) data about their state and the quality of communication with a moving object (SNR, CRC, received signal level, etc.) to server.

Due to this, server can choose the best ground station that provides communication with the mobile object in real time. That grants the ability to organize diversity reception(for traffic from a mobile unit to a server). Several ground stations simultaneously receive data from a mobile unit and send them to a server for merging. Thereby communication errors from different stations are compensated.

Modem 5.9 GHz - 6.2 GHz

Variant 1

Modem
Modem
Modem
Modem

Variant 2

Modem
Modem
Modem
Modem
Modem
Modem
Modem
Modem

Hardware

 
 

Modem 3.4 GHz – 3.6 GHz

Modem 3.4 GHz – 3.6 Ghz
Modem 3.4 GHz – 3.6 Ghz
  • The rate of the information high-speed channel OFDM QPSK ½ with bands:
    • 7 MHz — 5 Mbps;
    • 12 MHz — 8,5 Mbps;
    • 24 MHz — 17 Mbps.
  • For data rates over 24 Mbps, OFDM QAM16 ½, OFDM QAM16 ¾ modulation is used.
  • Interfaces: 2×RS-232 12 V, 1×UART 3.3 V, 1×I2C, 1×ADC, 12-pin GPIO, Ethernet 100 Mbit/s
  • Supply voltage: 12–32 V.
  • Weight:100 g.
  • PCB size: 80 × 110 mm.

Smart antenna RF module 3.4 GHz – 3.6 GHz

Rf-module 3.4 GHz – 3.6 GHz
Rf-module 3.4 GHz – 3.6 GHz
  • Frequency range: 3.4 GHz – 3.6 GHz.
  • Average output power: 350 mW.
  • Sensitivity for 7 MHz band:
    • CBA: –114 dbm (0,8 Mbps);
    • OFDM QPSK ½: –90 dbm (5 Mbps);
    • OFDM QPSK ¾: –87 dbm (7,5 Mbps);
    • OFDM QAM16 ½: –83 dbm (10 Mbps);
    • OFDM QAM16 ¾: –79 dbm (15 Mbps).
  • Weight: 50 g.
  • PCB size: 80×60 mm.
  • Interface: mezzanine connection.

Ground antenna 3.4 GHz – 3.6 GHz

Ground antenna 3.4 GHz – 3.6 GHz
Ground antenna 3.4 GHz – 3.6 GHz
  • Frequency range: 3.4 GHz – 3.6 GHz.
  • SWR < 1,4.
  • Gain: 23 dB.

Onboard antenna system 3.4 GHz – 3.6 GHz

Onboard antenna system 3.4 GHz – 3.6 GHz
  • Frequency range: 3.4 GHz – 3.6 GHz.
  • SWR < 1,5.
  • Gain: 6 dB.
  • Optimization of the antenna system for a specific mobile object (ground or air).
  • Antenna type - omnidirectional antenna array.

Modem 5.9 GHz – 6.2 GHz

Modem 5.9 GHz – 6.2 GHz
Modem 5.9 GHz – 6.2 GHz
  • The rates of the high-speed OFDM channel QPSK ½ using bands:
    • 7 MHz — 5 Mbps;
    • 12 MHz — 8,5 Mbps;
    • 24 MHz — 17 Mbps.
  • For data rates over 24 Mbps, OFDM QAM16 ½, OFDM QAM16 ¾ modulation is used.
  • Interfaces: 2×RS-232 12 V, 1×UART 3.3 V, 1×I2C, 1×ADC, 12-pin GPIO, Ethernet 100 Mbit/s
  • Supply voltage: 9–48 V.
  • Weight:110 g.
  • PCB size: 80 × 110 mm.

Smart antenna RF module 5.9 GHz – 6.2 GHz

Rf-module 5.9 GHz – 6.2 GHz
  • Frequency range: 5.9 GHz – 6.2 GHz.
  • Average output power: 350 mW.
  • Sensitivity for 7 MHz band:
    • CBA: –114 dbm (0,8 Mbps);
    • OFDM QPSK ½: –90 dbm (5 Mbps);
    • OFDM QPSK ¾: –87 dbm (7,5 Mbps);
    • OFDM QAM16 ½: –83 dbm (10 Mbps);
    • OFDM QAM16 ¾: –79 dbm (15 Mbps).
  • Weight: 50 g.
  • PCB size: 80×60 mm.
  • Interface: mezzanine connection.

Ground antenna system 5.9 GHz - 6.2 GHzRFE 6000/23HV

Ground antenna system 5.9 GHz - 6.2 GHz
  • Frequency range: 5.9 GHz – 6.2 GHz.
  • SWR < 1.5.
  • Gain: 23 dB.
  • Option: monoblock (modem integrated into the antenna).
  • Possibility of connecting up to 3 antennas to expand the antenna pattern.

Onboard antenna system 5.9 GHz – 6.2 GHz

Onboard antenna system 5.9 GHz – 6.2 GHz
Onboard antenna system 5.9 GHz – 6.2 GHz
  • Frequency range: 5.9 GHz – 6.2 GHz.
  • SWR < 1.5.
  • Gain: 6 dB.
  • Antenna type - a sector antenna with two sectors of 60 degrees in the horizontal plane.
  • Number of antennas: 3.

Full-scale tests

 

Unmanned aircraft

Test conditions: rough terrain. Ground antenna - 20 dB (40 × 40 cm). Communication range (video at a speed of 6 Mbit/s) - 84 km with altitude of aircraft more than 700 meters (line of sight). The CBA control channel has a large margin of range. Two switched on-board antennas minimized the effects of shadowing during aircraft maneuvers.

Quadcopter

Test conditions: rough terrain. Ground antenna 19 dB (30 × 30 cm). Communication range (video at a speed of 6 Mbit/s) - 12 km (max altitude of the quadcopter 120 meters). Low-speed CBA control channel (2 Mbit/s) has a large margin of range.

Ground Radio Controlled Robot

Test conditions: urban environment, no line of sight (iron fences, concrete buildings, radio holes) only CBA channel. Ground antenna 8 dB. Communication range 1 km (video at 2 Mbit/s).

Questions?

Feedback

Regarding the development of communication systems to meet your requirements or the purchase of ready-made solutions, you can write to us by email info@greencode.su or use the form on the right.

Our field of activity includes:

  • Development of circuit solutions for communication systems.
  • Development of the topology of printed circuit boards.
  • Assembly and debugging of devices under development.
  • Creating IP-core: synchronization modules, equalizers, modulators, demodulators, FEC, predistortion for the linearization transmitter.
  • Software development for microcontrollers.
  • Software development for control and debugging communication systems.

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