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The navtec GmbH developed a DSP card to realise a digital receiver for the Genitron GmbH, a company which produces radio activity measurement instruments. Procedures for signal identification and digital signal demodulation in a digital reception system were examined and tested as well.
The system was realised using an 80-MHz
DSP. You will find the technical specifications
at the end of this page.
|The DSP board||(Foto: R. Dielmann / Genitron
(Layout: ProDesign GmbH)
Genitron produces sondes to measure radio activity and also automatic data loggers, which readings have to be transmitted via long distances (up to 100 km) to reach a receiving station.
The problem is to transmit data daily for as long as several years with just one battery. Due to the limited capacity of the battery, this can only be done using very low transmitting power (aprox. 10 mW). However, transmission must be guaranteed. The problem was solved with a sensible combination of modulation type, source- and channel-encoding.
|DSP clock and instruction rate||80 MHz / 40 MIPS|
|memory||1 M - words at 24 Bit|
|ZF-ADC||interface via SSI, up to 1 MHz|
|Ref.-ADC||8 x 12 Bit, max. 100 kHz|
|Ref.-DAC||1 x 12 Bit, ca 70 kHz|
|I/Os||V24, several Port-I/Os|