Konstruktion av datainsamlingskort för mätsystemet COMET

Sammanfattning: During test flights SAAB uses the data acquisition system COMET 16. The part of the system that receives the signals from the sensors and converts them is called KSM 15. The purpose of this thesis is to develop a data acquisition module on stacked PC/104 modules with a lower production cost. Our work has been divided into one part about analog signal conditioning and a second part with digital filtering and memory management of the sampled data. The analog part, designed of regular components like instrument amplifiers, voltage references, operational amplifiers and multiplexers, adjusts the sensors signal levels for the ADC’s that converts the signals. In the digital part the sampling frequency is decimated by digital FIR filters in several stages down to 16 Hz. All the resulting data is temporarily stored in a SDRAM memory before being recovered by the HL-11 board that handles the communication with the other parts of the COMET system. We have made a design proposal that needs some additional work and testing before a prototype can be made. It’s primarily the C code in the digital part that needs further development. Our result and conclusions should be a great help in the future when developing a small,cheap data acquisition system.