IMPLEMENTATION OF DIGITAL SIGNAL PROCESSING WITH HIGH DATA RATE SENSORS FOR DATA COMPRESSION

Abstract

The onboard telemetry system of Korea Space Launch Vehicle-II (KSLV-II) acquires acoustic, vibration, and piezoelectric pressure sensors that require high data rate over several kilo samples per second, so the compression method is needed to expand link margin of telemetry system. This paper implements third-octave and FFT signal processing algorithms to reduce sensor data with high compression ratio depends on data acquisition requirements. The developed signal processing hardware module is composed of analog signal conditioning block and digital signal processing block on FPGA, and the digital block is fully implemented with dedicated hardware using HDL. For digital hardware implementation, multistage structure with ANSI standard octave filter bank is used for third-octave processing, and pipelined architecture is used for FFT. The performance of data acquisition and signal processing is evaluated and compared to the commercial data acquisition equipment.