ID 原文 译文
21825 其次，随机森林比其它常见的机器学习方法具有更高的预测精度，从而提供实时可靠的短时交通出行信息。 Besides, the Random Forest has higher prediction accuracy than other common machine learning methods, thus providing the short-term traffic information timely and reliably.
21826 大气折射误差是影响各类无线电系统同步、跟踪、导航、定位精度的一个主要误差源。 Atmosphere refraction error is a main error factor to affect synchronization accuracy, tracing accuracy, navigation accuracy and positioning accuracy for various radio systems.
21827 射线描迹法利用几何光学原理可以实现对该误差的精确修正。 On the basis of geometrical optics, the ray tracing method can precisely make this error correction.
21828 针对传统射线描迹法无法处理异常大气折射误差修正的问题，该文推导了射线描迹法的微分形式，并基于此提出适用于任意大气的折射误差修正方法。 For the problem that traditional ray tracing method can not deal with the abnormal atmosphere, ray tracing differential form is derived and then acorrection method suitable for arbitrary atmosphere is proposed.
21829 选取某地面测控站对目标的跟踪数据，验证了所提方法的可行性。 The tracing data from ground station are taken to test this method.
21830 此外，利用该方法对比分析了蒸发波导环境和标准大气环境对大气折射误差的影响。 In addition, the refractive error in evaporation duct is compared with that instandard atmosphere.
21831 结果表明：完全陷获在蒸发波导内部的电波引入的大气折射误差是最显著的。 The results show that the refractive error of radio wave trapped entirely in the duct has the biggest influence.
21832 所提方法为提高无线电系统在任意大气环境下的测量精度提供一种新的技术支持。 The proposed method provides technique support for improving the measurement precision of radio system in arbitrary atmosphere.
21833 针对现有机载自组织网络密钥管理存在的预分配密钥更新困难、公钥证书传递开销大、分布式身份密钥传递需要安全信道的问题，该文提出一种无需安全信道的基于身份密码体制的动态密钥管理方案。 Because of nowadays airborne network's updating difficulty of pre-allocated symmetrical key, high communication cost of public key certificate and the requirement of security channel for distributed identity-based key management, identity-based dynamic key management of airborne network is proposed.
21834 该方案包括系统密钥自组织生成和用户私钥分布式管理两个算法； It is composed of two algorithms: self-organized generation of master key without the trusted third party and distributed management of user's private key.