Abstract
The payloads being the principle performance
drivers for a satellite, must work properly throughout the
lifetime of a satellite to ensure space mission success. An
onboard Payload Processing Unit (PPU) is required for
payload data storage and its processing. Different
design and implementation techniques are employed to
achieve a reliable and computationally efficient PPU. Due to
the high computational capabilities of modern FPGAs at
relatively low power and cost, they can be used in the design
and implementation of PPUs. Their support for soft-core
processors and real time operating systems helps in increasing
the efficiency of PPU in terms of performance and flexibility.
This paper presents a fault tolerant PPU using commercial
off-the-shelf (COTS) components for Pakistan National
Student Satellite -1 (PNSS-1). The proposed PPU implements
a LEON3 processor on a Xilinx Virtex 4 FPGA using Triple
Modular Redundancy (TMR) and employing RTEMS for real
time operations of the PPU software.
Salim Ullah, Laiq Hasan, Asif Ali Khan, Asif Ali Khan, Muhammad Jaleed Khan, Abdullah, Asim Shahzad. (2015) An FPGA Based Fault Tolerant PPU for PNSS-1, Journal of Space Technology , Volume 5, Issue 1.
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