ID 原文 译文
5254 球面近似计算模型的定位误差次之，随纬度升高而增加； Positioning error of the spherical approximation calculation model is worse than the first model, andincreases with the increase of latitude.
5255 等距离正圆柱投影模型在低纬度地区定位误差较小，但在中、高纬度地区定位误差大； The equidistant orthographic cylindrical projection model has a small positioning errorin the low latitudes. However, it has a large positioning error in the middle and high latitudes.
5256 等角度正圆柱投影模型和等面积正圆柱投影模型的定位误差比较大，在任何纬度时均在 26%左右，不可用。 The equiangular orthographiccylindrical projection model and the equiareal orthographic cylindrical projection model have a relatively large positioningerror, which is around 26% at any latitude and is not applicable.
5257 信道容量反映了系统无差错传输信息的能力。 Channel capacity reflects the ability of the system to transmit information without errors.
5258 基于遍历微小单元法求出系统的路径损耗和脉冲响应，然后对脉冲响应采样序列进行离散傅里叶变换，得到系统的频率响应，计算出系统的 3 dB 带宽。 The path loss and im-pulse response of the system were calculated based on traversing tiny unit method, and then the frequency response of thesystem was obtained by the discrete Fourier transform of the impulse response sampling sequence, and the 3 dB bandwidthof the system was calculated.
5259 考虑信号光引起的散粒噪声，根据量子极限法求出系统的信噪比，进而用香农公式仿真分析非直视非共面紫外光通信系统信道容量和收发端几何参数之间的关系。 Considering the shot noise caused by signal light, the signal-to-noise ratio of the system wasobtained according to the quantum limit method, and then the relationship between the channel capacity and the geometricparameters of transmitter and receiver in non-line-of-sight noncoplanar ultraviolet communication system were simulatedand analyzed by Shannon formula.
5260 结果表明，信道容量随着接收端偏轴角和通信距离的增大而减小， The results show that the channel capacity decreases with the increase of the off axis an-gle and the communication distance.
5261 当收发仰角小于 40°时，随着收发仰角增大，信道容量快速减小，并且发射端仰角对信道容量的影响更显著； When the elevation angles of transmitter and receiver are less than 40°, the channel ca-pacity decreases rapidly with the increase of the elevation angles of transmitter and receiver, and the transmitter elevationangle has a great influence on the channel capacity.
5262 当发散角增大时，系统信道容量几乎不变；而当视场角增大时，系统信道容量增大。 The system channel capacity is almost constant with the increase of di-vergence angle, and the larger the receiver field of view angle, the greater the system channel capacity.
5263 用户撤销是基于身份的代理重签名方案在应用中必须解决的重要问题。 User revocation is necessary to the practical application of identity-based proxy re-signature scheme.