The device in question is to replace an existing RF-to-baseband
component of a geographically distributed signal collection system.
Each receiving station samples the 6 MHz passband, detects a signal and
estimates a time-of-arrival, then sends it on to a central facility that
performs the multilateration calculations. The existing TOA codebase
(and other decoders) expects 2 ns samples.
If there is only a 6MHz passband, then you should be able to interpolate to 500MSPS from the 6MSPS sample rate and be fine with your existing code base.
Right?
Brian