Design of Access Scheme for Detection Swarm for Satellites in HEO

doi:10.12382/bgxb.2022.0354

Abstract

Abstract:

Using satellites in high earth orbit (HEO) to return swarm detection data to gain decision-making advantages is indispensable in modern warfare. The access delay needs to be shortened to realize the real-time transmission of detection data. To deal with the scenario of large swarm size and long and intermittent communication links of satellites in HEO, we propose a formation maintenance information based non-orthogonal multiple access (FMI-NOMA) mechanism to solve the problem that the existing mechanism needs retransmission in the case of large single access delay. FMI-NOMA mechanism utilizes the interaction between nodes and uses an election algorithm to aggregate information so that only part of the nodes are allowed to attempt access at a time. Moreover, this mechanism combines the power domain non-orthogonal method to improve the probability of successful node access and avoid repeated attempted access, so that the access performance and system resource efficiency can be further increased. We model the service delay and resource efficiency and establish the optimization model of resource efficiency to analyze the key factors affecting the performance of the proposed mechanism considering the number of swarm nodes, the outage probability between the formation nodes, and the outage probability of satellite-ground links and other factors. The simulation results show that the mechanism improves the resource efficiency by about 45% and reduces the access delay by about 12% compared with the CRDSA mechanism and the improved CRDSA3 mechanism in the literature which has advantages in the HEO satellite communication systems with expanding formation scale and intermittent satellite-ground links.

Key words: HEO satellite networks, access scheme for swarm formation, distributed election, power domain

CLC Number:

TN927⁺.23

TONG Xin, LI Xu, LIU Yin. Design of Access Scheme for Detection Swarm for Satellites in HEO[J]. Acta Armamentarii, 2023, 44(8): 2354-2367.

Figures/Tables 12

Fig.1 Application scenario of HEO satellite swarm access

Fig.2 Diagram of frame structure

Fig.3 Process of FMI-NOMA

Fig.4 Diagram of election algorithm

Fig.5 An example of access process based on FMI-NOMA

Table 1 Value ranges of parameters

参数	取值范围
H	3
N	90~200
N_access	1~N
p_out-c	0.1, 0.2
p_out-s	0.1, 0.2
K	≥1
θ	0.6
S_a	⌊480/T_s」
T_c/μs	500
T_s/ms	6.48^[7,20]
T_tr/ms	120
T_serv/s	3^[27]

Fig.6 Access success probability

Fig.7 Access delay of FMI-NOMA

Fig.8 Resource efficiency of FMI-NOMA

Fig.9 Diagram of optimal resource efficiency

Fig.10 Access delay of different mechanisms

Fig.11 Resource efficiency of different mechanisms

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