Joint Polar Satellite System (JPSS) is the latest generation of US polar-orbiting environmental satellites. JPSS will aid in fulfilling the mission of the US National Oceanic and Atmospheric Administration (NOAA). Data and imagery obtained from the JPSS will increase timeliness and accuracy of public warnings and forecasts of climate and weather events, thus reducing the potential loss of human life and property and advancing the national economy.
The JPSS constellation contains two satellites, JPSS-1 and JPSS-2, which supplement and replace the NPOESS Preparatory Project (NPP) satellite. As with NPP, JPSS-1 will carry the Ozone Mapping and Profiler Suite (OMPS) and four other instruments.
The challenge for the JPSS Common Ground System (CGS) is that it will not only support two JPSS satellites, but also support NPP, defense mission satellites such as DWSS and international partner's mission, such as GCOM from Japanese Space Agency.
OMPS monitors ozone from space. From the photon collected by sensor to final data products, data format evolves each step. The instrument performs on-board processing and sends sensor data to spacecraft in CCSDS packet format via an IEEE 1553 interface. The Communication and Data Handling (C&DH) subsystem will perform multiplexing, encryption, and encapsulation of the packets in a Channel Access Data Unit (CADU). CADUs are sent to CGS during contact. CGS will then decrypt and de-multiplex the CADUs and extract the CCSDS packets. CGS will also wrap the packets in HDF5 (Hierarchical Data Format) as a Raw Data Record (RDR). The next step, CGS will produce Sensor Data Records (SDR) by unpacking and decommutating the packet, applying calibration (radiometric, geometric and engineering), and geo-locating using ephemeris, attitude and earth model information. The final CGS data products produced are Environmental Data Records (EDRs) and Application Related Products (ARPs).
Our end-to-end data modeling and simulation strategy will demonstrate how the OMPS science data format transformation from a CCSDS packet to an EDR. Commercial Off The Shelf (COTS) tools will be used to develop the product and generate the model in standard format. We also will try to import the data definition to the modeling tool from the xml files associated with the Data Format Control Book.
The end-to-end data modeling and simulation will provide a robust, independent verification and testing environment for all instruments and all missions using JPSS CGS.