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首页> 外文会议>14th international technical meeting of the Satellite Division of the Institute of Navigation (ION GPS-2001) >Using the Canadian Active Control System(CACS) for Real-Time Monitoring of GPSReceiver External Frequency Standards
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Using the Canadian Active Control System(CACS) for Real-Time Monitoring of GPSReceiver External Frequency Standards

机译：使用加拿大主动控制系统 r n（CACS）实时监视GPS r n接收器外部频率标准

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摘要

The Canadian Active Control System is a nationalrnnetwork of twelve continuously operating geodetic qualityrnGPS receivers equipped with external atomic frequencyrnstandards. Each GPS tracking station provides dualfrequencyrnpseudorange and carrier phase measurements inrnreal-time at 1 Hz to a central computer where wide arearnGPS corrections are generated using filtered ionospherefreerncombined pseudoranges and predicted ultra-rapidrnGPS orbits. In contrast to the technique of fixing one ofrnthe station clocks, the central process estimates satelliternand station clock phase offsets with respect to a VirtualrnReference Clock (VRC) that is maintained as a weightedrnmean of all estimated receiver clocks. The VRC is relatedrnto the smoothed mean GPS system time as provided byrnthe broadcast clock parameters of tracked satellites, andrnits alignment is maintained by regular steering operations.rnThis approach mitigates the effects of instabilities ofrnindividual station frequency standards and providesrncontinuity of the time reference.rnThis paper discusses the use of this system to monitorrnGPS satellite and receiver clocks. First, the centralrncomputing system provides continuous synchronisation ofrnthe network of GPS receiver clocks and GPS satelliternclocks at the ns level. Second, using the wide arearnsatellite orbit and clock corrections, users can synchroniserndual-frequency GPS receivers in real time at a precisionrnconsistent with the satellite clock estimates.
机译：加拿大主动控制系统是由十二个连续运行的大地测量质量GPS接收器组成的全国性网络，这些接收器配备了外部原子频率标准。每个GPS跟踪站都以1 Hz的频率实时向中央计算机提供双频伪距和载波相位测量，在中央计算机上，使用滤波后的电离层自由组合伪距和预测的超快速GPS轨道生成宽域的GPS校正。与固定站时钟之一的技术相比，中央处理相对于虚拟参考时钟（VRC）估计卫星和站时钟的相位偏移，该虚拟参考时钟被保持为所有估计的接收器时钟的加权均值。 VRC与跟踪卫星的广播时钟参数所提供的平滑平均GPS系统时间有关，并通过常规的转向操作来保持其对齐。rn这种方法减轻了单个电台频率标准的不稳定性的影响，并提供了时间基准的连续性。使用该系统监视GPS卫星和接收器时钟。首先，中央计算系统在ns级别提供GPS接收器时钟和GPS卫星时钟的网络的连续同步。其次，使用宽范围的卫星卫星轨道和时钟校正，用户可以以与卫星时钟估计值一致的精度实时同步双频GPS接收机。

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