Beam Tracking for UAV Mounted SatCom on-the-Move With Massive Antenna Array

Abstract

Unmanned aerial vehicle (UAV)-satellite communication has drawn dramatic attention for its potential to build the integrated space-air-ground network and the seamless wide-area coverage. The key challenge to UAV-satellite communication is its unstable beam pointing due to the UAV navigation, which is a typical SatCom on-the-move scenario. In this paper, we propose a blind beam tracking approach for Ka-band UAVsatellite communication system, where UAV is equipped with a large-scale antenna array. The effects of UAV navigation are firstly released through the mechanical adjustment, which could approximately point the beam towards the target satellite through beam stabilization and dynamic isolation. Specially, the attitude information can be realtimely derived from data fusion of lowcost sensors. Then, the precision of the beam pointing is blindly refined through electrically adjusting the weight of the massive antennas, where an array structure based simultaneous perturbation algorithm is designed. Simulation results are provided to demonstrate the superiority of the proposed method over the existing ones.Index Terms-UAV, SatCom on-the-move, beam tracking, mechanical adjustment, electrical adjustment, massive antenna array. ). 1 Geosynchronous satellite is usually used for UAV-satellite communication since its location relative to earth keeps invariant.

On the secrecy performance of integrated satellite‐aerial‐terrestrial networks

“…We can see that the objective function in (12) can be divided into two independent parts, Φ( r ) and R ′ s , where the former is the function of w r and the latter is the function of w t . Therefore, the maximum objective function can be obtained by maximizing Φ( r ) and maximizing R ′ s .…”

“…Until now, a lot of researchers have accept that using UAV as a relay for communications will play an important role in future communication system . In this context, the framework combining the UAV with SatCom referred as integrated satellite‐aerial‐terrestrial network (ISATN) has received wide attention …”

“…11 In this context, the framework combining the UAV with SatCom referred as integrated satellite-aerial-terrestrial network (ISATN) has received wide attention. 12,13 Compared with terrestrial communication facilities, however, a UAV acting as a relay and located at a high altitude is more vulnerable to security threats. Traditionally, the confidential transmission is guaranteed by using the cryptographic protocol at the upper layers, 14 which becomes unreliable in the event of a brute-force attack.…”

Reliable M2M/IoT data delivery from FANETs via satellite

“…This SNR value is then deteriorated by taking into account the rain attenuation effects for the UAV‐to‐satellite link according to the model in Section 4. The construction of effective antennas with suitable characteristics for these links remains a significant technical challenge in the case of FANETs …”

“…The construction of effective antennas with suitable characteristics for these links remains a significant technical challenge in the case of FANETs. [32][33][34] We recall that the satellite return link is used to send data from the FANET to the ground station. We used waveform ID 4, as detailed in Table 2: a period T = 10 s. 17 The Poisson distribution used for the time-driven fraction of the traffic has rate = 0.1 s −1 .…”