Abstract: In order to improve the interpretability of virtual test scenarios for autonomous vehicles and the coverage of high-risk scenarios, a virtual test scenario generation algorithm combining game theory and neural network SIG-GAN (social interactive gaming-generative adversarial network) is proposed. Taking the high-speed ramp merging scenario as an example, a converging interaction game model is constructed by capturing the interaction characteristics of ramp converging vehicles and vehicles traveling in the main lane. The converging data are used to obtain the vehicle priority probability to calculate the Nash equilibrium solution of the game strategy, and are integrated into the S-GAN neural network model for trajectory generation. At the same time, PICT (pairwise independent combinatorial testing) model is introduced to combine the real trajectories of interacting vehicles in the observation area, which is combined with SIG-GAN algorithm to generate a large number of high-risk interaction trajectories with realistic game interaction behavior. Through the comparison experiment with LSTM, S-LSTM, S-GAN and other trajectory generation algorithms, the results show that: (1) The model generates trajectories with an average decrease of 25.30%, 18.98%, 7.02% in ADE and 17.33%, 16.06%, 7.65% in FDE compared with other algorithms in the time domains of 3.2 s and 4.8 s, and generates trajectories more accurately. (2) The number of generated trajectories after the combination test is 150 times of the original trajectories, with higher coverage. The TTC (time to collision) of the generated trajectory and the original trajectory is concentrated in 1.057 7 s and 3.513 5 s respectively, with a greater degree of scene risk, which is of practical significance for the virtual scene enhancement test of autonomous vehicles.

Key words: autonomous vehicle, scene generation, game theory, generative adversarial network

摘要： 为提高自动驾驶车辆虚拟测试场景的可解释性和高风险场景覆盖度，提出了一种将博弈论与神经网络相结合的虚拟测试场景生成算法SIG-GAN（social interactive gaming-generative adversarial network）。以高速匝道合流场景为例，通过捕捉匝道汇入车辆与主车道行驶车辆的交互特征，构建汇入交互博弈模型。利用汇入数据获得车辆优先通行概率来计算博弈策略的纳什均衡求解，并融入S-GAN神经网络模型中进行轨迹生成。同时引入PICT（pairwise independent combinatorial testing）模型对观测区域交互车辆的真实轨迹进行组合测试，结合SIG-GAN算法生成大量具有现实博弈交互行为的高风险交互轨迹。通过与LSTM、S-LSTM、S-GAN等轨迹生成算法进行对比实验，结果显示：（1）模型较其他算法在3.2?s与4.8?s时域下，生成轨迹ADE平均下降25.30%、18.98%、7.02%，FDE平均下降17.33%、16.06%、7.65%，生成精度更为准确；（2）通过组合测试后生成轨迹数量为原始的150倍，覆盖度更高。生成轨迹与原轨迹的碰撞时间（time to collision，TTC）分别集中在1.057?7?s、3.513?5?s，场景风险程度更大，对自动驾驶汽车的虚拟场景强化测试具有实际意义。

关键词: 自动驾驶汽车, 场景生成, 博弈论, 生成对抗网络