SCIENTIA SINICA Informationis, Volume 50 , Issue 3 : 375-395(2020) https://doi.org/10.1360/SSI-2019-0184

Feasibility of reinforcement learning for UAV-based target searching in a simulated communication denied environment

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  • ReceivedAug 27, 2019
  • AcceptedOct 4, 2019
  • PublishedFeb 27, 2020


Target searching is crucial in real-world scenarios such as search and rescue in disaster sites and battlefield target reconnaissance. Unmanned aerial vehicles (UAVs) are an ideal technical solution for target searching in large-scale and high-risk areas because they are agile, low cost, and able to collaborate and carry different sensors. In complex scenarios like battlefields, due to the lack of communication infrastructures and the intensive interference, UAVs often operate in communication denied environments. As a result, fast and reliable communication channels between UAVs and ground operators are difficult to establish. Thus, in such conditions, UAVs must be able to complete tasks autonomously and intelligently, without receiving real-time commands from the operators. With the rapid advances in artificial intelligence, reinforcement learning has shown potentiality for solving continuous decision problems. The target searching problem studied in this paper falls into this category and is suitable for adopting reinforcement learning technologies. However, the feasibility of reinforcement learning in UAV-based target searching in communication denied environments is not clear and, thus, requires in-depth investigations. As a pilot study in this direction, this paper models the target searching problem in communication denied and confrontation situations and proposes a simulation environment based on this model. Extensive experiments are conducted to answer the following questions. (1) Can reinforcement learning be applied in target searching by multi-UAVs in communication denied environments? (2) What are the advantages and disadvantages of different reinforcement learning algorithms in solving this problem? (3) How the degree of communication denial influences the performance of these algorithms? The current mainstream reinforcement learning technologies are adopted to perform simulations, whose results are analyzed quantitatively, leading to the following observations. (1) Reinforcement learning can effectively solve target searching problems for multi-UAVs in communication denied environments. (2) Compared with other algorithms, an autonomous decision-making UAV cluster based on a deep Q-network (DQN)exhibits the best problem-solving ability. (3) The algorithm performance changes with the degree of communication denial but remains largely stable when the communication condition varies.

Funded by

2018年度科技创新2030 —“新一代人工智能"重大项目(2018AAA0102302)



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  • Figure 1

    (Color online) Simulation environment. (a) Overview of battlefield simulation environment; (b) partial enlargement

  • Figure 2

    (Color online) RQ1 result. (a) The mean of target acquired; (b) mission complete rate; (c) the mean of mission complete time

  • Figure 3

    RQ3 result. (a) Mission complete rate; (b) the mean of mission complete time; (c) the mean of target acquired

  • Table 1   Reward settings
    Environmental feedback Reward
    Finding a target 1000
    Destorying a drone on enemy side 125
    A drone being destroyed $-$125
    Moving a step $-$1
  • Table 2   RQ1 experiment settings
    Number Algorithm (red) Algorithm (blue)
    1 Random walk Random walk
    2 DQN Random walk
    3 L-QL Random walk
    4 A3C Random walk
    5 DPPO Random walk
  • Table 3   RQ2 experiment settings
    Number Algorithm (red) Algorithm (blue)
    1 DQN L-QL
    2 DQN DPPO
    3 L-QL DPPO
  • Table 4   Score settings
    Missing result Score
    One target acquired 1
    Both targets acquired 2
    No target acquired 0
    Each drone being destroyed $-0.1$
  • Table 5   Victory rate (VR) (%)
    DQN 72.2 90.1
    L-QL 14.9 42.7
    DPPO 5.1 28.4
  • Table 6   Mission complete rate (MCR) (%)
    DQN 49.1 72.0
    L-QL 4.6 20.4
    DPPO 0.7 2.6
  • Table 7   Mission complete time steps ($\overline{\rm~MCT}$)
    DQN 358.56 297.79
    L-QL 484.61 613.55
    DPPO 905.14 683.58

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