SMAP L1A Radar Time-Ordered Parsed Telemetry, Version 1

This Level-1A (L1A) product provides all data downlinked from the Soil Moisture Active Passive (SMAP) radar during 6:00 a.m. descending and 6:00 p.m. ascending half-orbit passes. The product also contains information about the spacecraft position and attitude, as well as the antenna azimuth position over the same time period that the radar telemetry covers. The major contents of the product include high resolution synthetic aperture radar data, low resolution real aperture radar data, instrument loopback data, instrument health and status data, and standard operating conditions at antenna rotation granularity.

本Level-1A（L1A）级产品包含土壤湿度主动被动（Soil Moisture Active Passive, SMAP）雷达在凌晨6:00降轨半轨与傍晚6:00升轨半轨过境期间下传的全部数据。该产品还涵盖了雷达遥测覆盖的同一时段内的航天器位置与姿态信息，以及天线方位位置数据。该产品的主要内容包括高分辨率合成孔径雷达（synthetic aperture radar）数据、低分辨率真实孔径雷达（real aperture radar）数据、仪器回送数据、仪器健康与状态数据，以及天线旋转粒度级别的标准运行工况。