The FLP Microsatellite Platform by Jens Eickhoff

Author:Jens Eickhoff
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

9.2.3.2 PMC Internal Mission Product Data Handling

A matrix structure of all data sinks, data sources and data buffers is used to transfer payload data from one entity of the top level to another. During operations the matrix can be re-arranged so that each data sink has a single data source. A data source however can have several data sinks. By this means data can also be stored in multiple sinks with redundancy. Figure 9.7 depicts an example configuration where all data coming from the sensor payloads—the multi-spectral camera MICS (red channel as example here), PAMCAM or AIS receiver—are processed on the FPGA in parallel.

All data is handled by pipelining them from one entity to another. If a data sink—like an MMU bank, the DDS transmission system—is busy it signals the source to stop sending data to prevent data loss. As this will not work for payload hardware like a camera or the AIS receiver, intermediate SRAM buffers are implemented to guarantee a continuous data input sink for the hardware generated signals. These synchronous SRAM elements act like FIFO buffers.

As with the commanding architecture, all data sinks and sources have a standardized interface this means that a new entity for data handling can easily be implemented. E.g. an entity for formatting data into CCSDS frames using forward error correction can be implemented to the top level and added to the data matrix. Then the encoding mechanism for example can be placed between SSRAM 3 and DDS N depicted in Fig. 9.7.

Fig. 9.7Configuration example for parallel data handling on PLOC. © IRS, University of Stuttgart

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