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accuracy | 精度
| The extent to which a measured or enumerated value agrees with the assumed or accepted value. See PRECISION. | 测量值或计算值与假定值或可接受值之间相一致的程度。参见precision（精密度）。 |
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accuracy: absolute | 绝对精度
| The evaluation of all errors encountered in defining the position of a single feature or point on a GEODETIC DATUM or system. | 确定单要素或大地基准及大地坐标系中点的位置时，对所有误差的估算值。 |
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accuracy: relative | 相对精度
| The evaluation of the RANDOM ERRORS in determining the positional orientation of one point or feature with respect to another. | 在确定一个点或要素相对于另一个点的位置时对随机误差的估算值。 |
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accuracy: repeatable | 重复精度
| See REPEATABLE ACCURACY. | 在导航系统中，能使用户返回到仅适合该系统所确定之坐标位置的精度。例如，用于LORAN-C系统重复精度规... more |
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achromat | 消色差透镜
| See ACHROMATIC LENS. | 参见achromatic lens（消色差透镜）。 |
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achromatic lens | 消色差透镜
| A compound LENS that has been partly corrected forchromatic aberration.Such a LENS is customarily made to bring green and red LIGHT RAYS to ... more | 对色差进行了部分修正的组合镜头，这种透镜通常使红绿光线聚焦在大致相同的焦点。见aberration of light（... more |
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aclinic line | 无倾线
| See EQUATOR: MAGNETIC. | 参见magnetic equator（磁赤道线）。 |
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acoustic | 声学
| Science of sound, including its production, transmission and effects. | 关于声音产生、传输和效果的科学。 |
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acoustic bearing | 声学定位，声方位
| See BEARING: SONIC. | 参见sonic bearing（声方位）。 |
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acoustic line of position | 声响位置线
| See SONIC LINE OF POSITION. | 参见sonic line of position（声测位置线）。 |
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acoustic navigation | 声学导航
| See NAVIGATION: SONIC. | 参见sonic navigation（声波导航）。 |
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acoustic sounding | 声波测深，回声测深
| See ECHO SOUNDING. | 参见echo sounding（回声测深）。 |
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acoustic wave | 声波
| See WAVE: SOUND. | 参见sound wave（声波）。 |
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active satellite | 有源卫星，主动卫星
| An artificial satellite which transmits an electromagnetic signal. A satellite with the capability to transmit, repeat, or retransmit electr... more | 1.发送电磁信号的人造卫星。相对于被动卫星，主动卫星具备发送、重发或转发电磁信息的能力。
2.按照... more |
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active system | 有源系统
，主动系统 | Any electromagnetic or sonic position fixing system operating with an interrogation-response procedure. See also PASSIVE SYSTEM. | 任何以应答方式工作的电磁或声响定位系统。参见passive system（被动系统，无源系统）。 |
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active tracking system | 主动跟踪系统
| A satellite system which operates by transmission of signals to and receipt of responses from the satellite. | 向卫星发射信号和接收其应答信号的卫星系统。 |
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adiabatic process | 绝热过程
| A thermodynamic change of state of a system in which there is no transfer of heat or mass across the BOUNDARIES of the system. In an adiabat... more | 在系统与外界不发生热交换或没有物质穿过系统界面的情况下，系统内部所发生的热力变化。在绝热过程... more |
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adiabatic temperature change | 绝热温度变化
| RISE or fall of temperature due to compression or expansion without gain or loss of heat to the surroundings. | 在不向外界吸热或放热的情况下，由于压缩或膨胀而引起的温度升降。 |
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adjacent coasts | 相邻海岸
| The coasts lying either side of the land boundary between two adjoining States. | 位于两个邻国之间陆地边界任一侧的海岸。 |
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adjusted position | 平差位置
| See POSITION. | 地球上某点坐标的平差值。 |