中文摘要：

针对设想的三种近空间飞行器巡航方案，分析了不同巡航方式可能采用的推进系统，建立了相应的动力学模型，对各方案进行了弹道计算，研究了巡航高度对动力巡航方案航程的影响。依据计算结果，对不同方案的弹道特性进行了比较分析，结论认为现阶段应优先发展无动力滑翔和弹道跳跃式近空间飞行器。

英文摘要：

Aiming at different cruise scenario of near space vehicle, the dynamics models were built and the possible propulsion system was established. After building dynamic equations, the ballistic trajectory of each scenario was obtained and the influence of cruise altitude on range was studied. Based on the calculation result, the different characteristics of each scenario were analyzed. It is concluded that the unpowered glide scenario and trajectory skip scenario should have a prior claim to development.