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2.5.2 MWR Level 0 products Definition

The Microwave Radiometer operates only in the MWR-ON mode. When in this mode, the instrument measures in two frequencies (24 GHz and 36 GHz), operating continuously in the whole orbit. The data coming from the instrument are packed in binary format and sent to ground in the form of Source Packets. Structure

The Microwave Radiometer is a Low Bit Rate Instrument, and its Level 0 products, that correspond to one full orbit of data, have a standard LBR Level 0 data format:

  • a Main Product Header (MPH) containing the product identification, the UTC time of data sensing, the geographical location of the product scene, the orbit parameters to generate the product, the On Board Time (OBT) to UTC conversion table, etc.
  • a Secondary Product Header (SPH) containing information specific of the instrument/ data processing/ overall quality of the product, the instrument status at the time of product generation, etc., and
  • a number of data set records (MDSRs) in one only MDS

The MPH is not specific of the product level, while the SPH is specific of each level.

The number of Data Sets attached in the L0 MWR products is always 1, although there are DSs referred to in the SPH, through DSDs, for the auxiliary data used to build the products.

The MWR Level 0 Data Set records are composed of some FEP and PF-HS annotations, and quality indicators, common to all ENVISAT instruments, and a dedicated part called Instrument Source Packets. The ISPs are organised with a Packet Header and a Packet Data Field. Packet Header

The Packet Header contains general information about the data contained in the Source Packet, like packet identification, packet sequence control and packet length, an has fixed length (3 words). Packet Data Field

The Packet Data Field contains the scientific data and any auxiliary data which are specific to the generating source on board the spacecraft (Instrument Mode definition, ICU on board time code, etc,) and has variable length.

The scientific data will be inserted in Science data field composed of a certain number of CEU generated Telemetry data (TM data) and contain information on calibration status, operational mode flag, source packet counter and radiometer output data.

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry