l惯性基准系统——此系统输出例如像航向、高度及飞机当前位置等关键导航参数。
L IRS— this system provides outputs of key navigation parameters such as heading, attitude, and airplane present position.
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。
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。
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.
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