Orbit Design and Analysis of Phobos Close Approach Exploration Mission for Tianwen-1 Mars orbiter
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摘要:针对“天问一号”火星环绕器火卫一抵近探测拓展任务设想开展了任务轨道设计与分析,将主任务结束后的状态作为拓展任务的输入,对拓展任务轨道、变轨策略及燃料代价进行设计。通过分析得出,可利用火星摄动力调整近火点幅角使得环绕器轨道与火卫一轨道相交,且相交频率与半长轴和偏心率相关。为提高相交次数需进行降轨,进一步分析了利用火星大气辅助降轨以降低燃料消耗、提高轨道相交次数的可能性,最后通过调相机动的方式使环绕器完成火卫一抵近探测任务。仿真结果表明:所设计的拓展任务轨道及变轨策略的速度增量代价合理可行,可为后续火星环绕探测任务轨道设计提供参考。
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关键词:
- 火卫一抵近探测/
- 轨道设计/
- “天问一号”火星环绕器
Abstract:In this paper, the mission orbit design and analysis of a potential extended mission, Phobos close approach exploration, was carried out. The state at the end of the main mission was used as the input of the extended mission in this paper. Through analysis, it was concluded that Mars perturbation force could be used to adjust the argument of perigee, and the intersection frequency was related to the value of semi-major axis and eccentricity. Orbit descent maneuver should be performed to increase the number of intersections. As a result, the possibility of conducting aero-braking in order to reduce fuel consumption was analyzed. Finally, phase adjustment maneuver was calculated to complete the Phobos close approach exploration mission. The orbit design results and the velocity increment are given by simulation. The results of this paper can provide reference for orbit design of Tianwen-1 orbiter’s extended missions.Highlights● Under the condition that the remaining fuel of Tianwen-1 Mars orbiter was considerably limited and the Orbiter could not be directly transferred to the orbit of Phobos, this paper utilized Mars perturbation force in adjusting the argument of perigee to make the orbit of the orbiter intersect with the orbit of Phobos. ● The intersecting frequency between the orbit of Tianwen-1 Mars orbiter and Phobos is related to the value of semi-major axis and eccentricity. The intersecting frequency can be maximized by designing appropriate orbital parameters. ● In order to complete the close approach detection of Phobos, the Orbiter has to maneuver from the remote sensing orbit to the extended mission orbit. The Mars aero-braking is adopted as the orbital descent maneuver strategy, which can reduce fuel consumption by 80%. ● By designing an appropriate phase adjustment orbit period, the phase adjustment velocity increment can be controlled to within 10m/s under the worst conditions of approach detection phase. -
表 1各探测器的大气辅助降轨效果
Table 1Aero-braking results of Probes
任务名称 大气辅助降轨前
远星点高度/km大气辅助降轨后
远星点高度/km节省燃料/kg 大气辅助
降轨时长Magellan 8 450 540 490 约70 d MGS 54 200 430 330 约300 d Odyssey 26 200 540 320 约76 d MRO 44 000 500 580 约6个月 MAVEN 6 200 4 500 100 约50 d ExoMars 33 000 1 000 300 约8个月 表 2调相速度增量数据表
Table 2Velocity increment data of phase adjustment
速度增量/(m·s-1) M= 1.5 M= 2.5 M= 3.5 M= 4.5 M= 5.5 M= 6.5 M= 7.5 M= 8.5 M= 9.5 M= 10.5 N= 4 886.50 102.64 453.90 642.17 762.06 846.19 909.00 957.99 997.46 1030.05 N= 5 1 486.94 214.42 225.15 458.69 606.74 710.31 787.49 847.60 895.97 935.87 N= 6 2 090.17 517.29 9.33 286.58 461.54 583.58 674.35 744.94 801.68 848.45 N= 7 2 713.29 811.61 197.69 122.46 323.55 463.42 567.25 647.89 712.63 765.94 N= 8 3 375.24 1 101.08 398.48 35.750 190.98 348.25 464.76 555.12 627.59 687.21 N= 9 4 103.44 1 388.38 594.80 189.48 62.64 237.00 365.93 465.77 545.75 611.51 N= 10 4 949.3 1 675.71 787.94 339.71 62.34 128.91 270.06 379.20 466.55 538.30 N= 11 6 052.94 1 964.97 978.88 487.22 184.59 23.430 176.65 294.96 389.54 467.17 N= 12 8 316.15 2 257.98 1 168.44 632.59 304.62 79.880 85.310 212.69 314.41 397.82 N= 13 8 652.11 2 556.62 1 357.31 776.32 422.82 181.36 4.2600 132.11 240.88 330.01 N= 14 8 966.79 2 862.92 1 546.11 918.81 539.51 281.30 92.310 52.990 168.76 263.54 N= 15 9 263.22 3 179.21 1 735.37 1 0 0.41 654.97 379.93 179.06 24.860 97.870 198.26 N= 16 9 543.78 3 508.35 1 925.64 1 201.41 769.43 477.44 264.67 101.59 28.060 134.02 N= 17 9 810.42 3 854.00 2 117.43 1 342.09 883.09 574.00 349.30 177.34 40.790 70.71 N= 18 10 064.71 4 221.13 2 311.26 1 482.7 996.13 669.77 433.07 252.22 108.78 8.24 N= 19 10 307.97 4 616.95 2 507.66 1 623.48 1 108.71 764.86 516.09 326.33 176.01 53.470 N= 20 10 541.30 5 052.75 2 707.22 1 764.64 1 220.97 859.40 598.47 399.77 242.55 114.51 N= 21 10 765.65 5 548.5 2 910.56 1 906.4 1 333.06 953.48 680.28 472.60 308.47 174.94 N= 22 10 981.82 6 146.91 3 118.39 2 048.97 1 445.09 1 047.2 761.61 544.89 373.84 234.81 N= 23 11 190.51 6 987.04 3 331.51 2 192.58 1 557.18 1 140.66 842.53 616.72 438.72 294.18 表 3同一火卫运行圈数筛选对应的最小速度增量
Table 3The minimum velocity increment corresponding to the same number of Phobos cycle
参数 M= 1.5 M= 2.5 M= 3.5 M= 4.5 M= 5.5 M= 6.5 M= 7.5 M= 8.5 M= 9.5 M= 10.5 最小速度增量/(m·s-1) 886.50 102.64 9.33 35.75 62.34 23.43 4.26 24.85 28.06 8.24 探测器运行圈数N N= 4 N= 4 N= 6 N= 8 N= 10 N= 11 N= 13 N= 15 N= 16 N= 18 调相轨道周期/min 141.1 294.3 268.5 257.4 251.3 272.1 265.0 260.0 273.3 268.2 表 4环绕器与火卫一不同初始相位差下的最小速度增量
Table 4Minimum velocity increment at different initial phase differences between satellite and Phobos
参数 值 环绕器与火卫一初始相位差 30° 45° 90° 135° 180° 最小速度增量/(m·s-1) 3.37 2.56 1.83 0.98 4.26 火卫一运行圈数 8.08 8.13 9.25 6.375 7.5 探测器运行圈数 14 14 16 11 13 表 5拓展任务轨道机动速度增量
Table 5Maneuver velocity increment of additional tasks
机动动作 速度增量/(m·s–1) 远火点机动,降低近火点高度至110 km 10.2 远火点机动,抬高近地点高度至260 km 13.4 近火点调相机动 9.33 合计 32.93 -
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