2.1 - Transhorizon over-sea propagation tests with Line-of-Sight Lygarion® Data Link technology
- ettc2018 - European Test and Telemetry Conference
2018-06-26 - 2018-06-28
- 2. Modulation & Coding
- A. Fihel, J. Mailleux, J. Ernst - HENSOLDT France, Plaisir (France)
- 29 - 36
This paper describes the experimental tests results of the transhorizon NLoS propagation over the sea, with Line-of-Sight Lygarion® Data Link technology, between an experimental ship and a low altitude ground station located on the cost border.
A series of experiments were performed in order to measure and to better understand the achievable performances (in terms of link coverage) for high data rate transmission over the sea and thereby to meet the needs of “command/control” and sensor data transmission for an unmanned marine vehicle systems USV.
The maximum range in NLoS conditions over the sea is a critical issue for major applications, such as the control of an USV for which the unavailability of the data link could be hazardous and, in some cases, catastrophic.
The experimental results have good agreement with the simulated values, obtained taking into account some propagation losses.
Our results and analysis show that some of the NLoS over-sea propagations phenomenon such as the reflection from sea surface and the multipath may be significantly overcome by the use of steerable directional antennas, double QoS double stream (DQDS) protected waveforms as well as efficient link management link acquisition functions.