How many messages are needed to process the Doppler curve?
Four or more messages are needed. Messages need to be well distributed along the satellite pass in order to enable proper determination of the Doppler curve, and in particular of the inflection point which corresponds to the actual transmit frequency. What is the impact of the maximum speed of my platform, which value should I give? The maximum speed is used to validate the locations (see plausibility tests in FAQ above). Note that this test is given special weight as it is the only one clearly related to the nature of the platform. When both tests (max. speed and minimum distance from previous location) fail, the validation fails and the location is given a class Z. It is in your interest to provide a realistic maximum speed of your platform. • If the maximum speed is underestimated, this will not suppress all the locations but may reduce their number. As an example, you should still receive some locations from your drifter when it is on its way for deployment on the ship deck though
