DATA LINK
Encryption capacity and management
The communication system supports encryption using an internal AES.256 (CBC) encryption algorithm. The cipher block can be omitted to enable the unencrypted mode of operation. The system supports key injection by the customer using a designated key loader provided by the customer or developed by the vendor.
Video compression
The communication system includes a video encoder and decoder using the H.264 video compression standard. The remote transceiver can be connected to an analog composite video source or SDI interface through the use of a Commtact video encoder unit.
The Central Terrestrial Data Terminal transmits the video to the video player installed in the control station computers.
Software defined radio
Commtact products are based on software defined radio (SDR) architecture that enhances system capabilities and reliability. The SDR design allows Commtact to provide our customers with state-of-the-art technology that can be easily adapted to their requirements. To meet evolving technological demands, customers can easily upgrade SDR systems. The upgrade is based on a software and firmware update without the need to change the hardware.
Transmission Security (TRANSEC)
The system implements two complementary techniques: Direct Sequence Spread Spectrum Spread Spectrum (DSSS) or Frequency Hopping (FH) aimed at counteracting hostile jammers and reducing the electromagnetic footprint of the transmission thus reducing its exposure to hostile parties achieving a low probability of interception (LPI) and achieving privacy thus increasing the robustness of the system.
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Modulation
The DLS provides full duplex digital communication. Gaussian digital minimum shift keying (GMSK) modulation is used due to its spectral efficiency and allows the use of efficient power amplifiers, which substantially reduces the platform’s power consumption. This is a critical factor for unmanned tactical platforms that have a limited power budget.
The transceiver uses digital techniques for demodulation and provides high data link performance with a high fading margin. Having outstanding spectrum efficiency with data rate selectivity. The direct error correction (FEC) technique is key to advanced system performance.