Design Note #54
OTEC selected the Texas Instruments TMS320C6713 floating point DSP Processor for this four-channel LORAN receiver design. Built for flexibility and power, the 500MHz TMS320C6713 provides high performance floating point processing performance to make this receiver highly configurable. Working with Code Composer Studio, OTEC fashioned drivers, data acquisition modules and a number of low-level utilities.
LORAN signal groups must be received by a distortion-free, highly selective analog front-end amplifier chain. That analog front-end amplifier chain must provide distortion-free operation over a very wide dynamic input range. OTEC designed a multistage variable gain front-end amplifier and over- sampling data acquisition system. This highly selective system provides software controlled gain selection over 120 dB of dynamic range. The scope trace below shows a typical LORAN signal burst:
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