The Advanced Topographic Laser Altimetry System (ATLAS) is the sole instrument on the Ice, Cloud, and land Elevation Satellite 2 (ICESat‐2). Without some method of reducing the transmitted data, the volume of ATLAS telemetry would far exceed the normal X‐band downlink capability or require many more ground station contacts. The ATLAS Onboard Flight Science Receiver Algorithms (hereinafter Receiver Algorithms or Algorithms) control the amount of science data that is telemetered from the instrument, limiting the data volume by distinguishing surface echoes from background noise, and allowing the instrument to telemeter data from only a small vertical region about the signal. This is accomplished through the transfer of the spacecraft's location and attitude to the instrument every second, use of an onboard Digital Elevation Model, implementation of signal processing techniques, and use of onboard relief and surface type reference maps. Extensive ground testing verified the performance of the Algorithms. On‐orbit analysis shows that the Algorithms are working as expected from the ground testing; they are performing well and meeting the mission requirements.

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ICESat / 2 / ATLAS机载飞行科学接收器算法：目的，过程和性能

先进的地形激光测高系统（ATLAS）是冰，云和陆地高程卫星2（ICESat-2）上的唯一仪器。如果没有减少传输数据的方法，ATLAS遥测的规模将远远超过正常的X波段下行链路能力，或者需要更多的地面站联系。ATLAS机载飞行科学接收器算法（以下称接收器算法或算法）控制从仪器遥测的科学数据的数量，通过区分表面回声和背景噪声来限制数据量，并允许仪器仅对很小的数据进行遥测信号周围的垂直区域。这是通过每秒将航天器的位置和姿态转移到仪器上，使用机载数字高程模型，实施信号处理技术，并使用机载浮雕和表面类型参考图。广泛的地面测试验证了算法的性能。在轨分析表明，这些算法正在按地面测试的预期进行工作；他们表现良好，符合任务要求。