Term 术语 Definition 定义
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)。
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。
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。
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系统重复精度规定的距离,是两个LORAN-C位置的距离,这两个位置是在不同时间用同样的台站和时间差读数建立的。已知或未知的地理坐标和系统坐标间的相互关系。
achromat
消色差透镜
See ACHROMATIC LENS.
参见achromatic lens(消色差透镜)。
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
A compound LENS that has been partly corrected forchromatic aberration.Such a LENS is customarily made to bring green and red LIGHT RAYS to approximately the same point focus. Also calledachromat. See ABERRATION OF LIGHT.
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(像差)。
aclinic line
无倾线
See EQUATOR: MAGNETIC.
参见magnetic equator(磁赤道线)。
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。
acoustic bearing
声学定位,声方位
See BEARING: SONIC.
参见sonic bearing(声方位)。
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)。
acoustic navigation
声学导航
See NAVIGATION: SONIC.
参见sonic navigation(声波导航)。
acoustic sounding
声波测深,回声测深
See ECHO SOUNDING.
参见echo sounding(回声测深)。
acoustic wave
声波
See WAVE: SOUND.
参见sound wave(声波)。
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
An artificial satellite which transmits an electromagnetic signal. A satellite with the capability to transmit, repeat, or retransmit electromagnetic information as contrasted with passive satellite. 2. As defined by the International Telecommunication Union (ITU), an earth satellite carrying a station intended to transmit or retransmit radiocommunication signals.
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.按照国际电联(ITU)的定义,指搭载无线电信号发射或转发台站的地球卫星。
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)。
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。
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
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 adiabatic process, compression always results in warming, expansion in cooling.
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。在绝热过程中,压缩总是引起增温,膨胀总是引起降温。
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。
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。
adjusted position
平差位置
See POSITION.
地球上某点坐标的平差值。