A simple inertial or Doppler navigation has a common defect that position errors are always increasing with flight time or distance, therefore an external reference system is necessary.
纯惯性导航或多普勒导航的一个共同缺点是：一般都具有随时问或距离增长的位置误差，这就需要有一个外基准系统。
The environment coefficient usually relates to some external environment factors, such as the distance to genetic sag and the contact degree to frontal sand body of delta.
环境系数通常与距离生油凹陷的远近及与三角洲前缘砂体的接触程度等外部环境因素有关。
The results show that the shock standoff distance, skin friction coefficient and surface heat flux all increase with the strengthening of the external dipole magnetic field.
计算结果表明，外加偶极子磁场使激波脱体距离增加，壁面摩擦系数和表面热流密度增大。
To select the global best position for each particle and update the external archive, a new crowding distance measure is adopted to evaluate particles'density.
通过定义的新拥挤距离测度计算微粒的分布密度，完成微粒全局最优点的选择以及外部储备集的更新。
External experimental results show that the method can improve the detection distance of the laser radar, and the head-on intercept capture distance can improve about 2 ~ 3 times.
外场实验结果表明：该方法可有效地提高激光雷达的测距能力，迎头截获距离可提高约2 ~3倍。
The results show that the shock standoff distance is increased and total drag coefficient and wall temperature are reduced with increasing external magnetic field.
结果表明，随着磁场的增强，激波脱体距离逐渐增加；总阻力系数和壁面温度逐渐减小。
Both the attendance machine and external card reader are mounted on the wall. A mental wall or gate will shorten greatly the distance to punch card, even make it unable to work.
本考勤机和外置的打卡头都是安装在墙壁上使用的，但是如果安装在金属墙壁或金属门上，将明显缩短打卡距离，甚至完全不能打卡。
The broken-end stop motion is controlled by synchronized tracking infrared photoelectric system capable of long-distance monitoring with less power and resisting external light interference.
断丝自停采用同步跟踪式红外光电控制，抗外界光干扰，耗电少但检测距离远。
The broken-end stop motion is controlled by synchronized tracking infrared photoelectric system capable of long-distance monitoring with less power and resisting external light interference.
断丝自停采用同步跟踪式红外光电控制，抗外界光干扰，耗电少但检测距离远。
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