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Re: Navigation using satellite doppler shift
From: Paul Hirose
Date: 2016 Jan 31, 11:30 -0800

About 20 years ago I wrote a program to determine ham radio satellite orbits from the dopplers on their signals. Rather than the actual doppler shift, it used what I called "delta doppler": the change in received frequency between two accurately timed points of a satellite pass. The advantage of delta doppler is that it only requires the transmitter and receiver frequencies to remain stable during the pass. Their absolute frequency need not be known to high accuracy. Having been out of that for many years, it was difficult to interpret my old notes, but it looked like I was pretty happy with the results. The technique may work for low accuracy "just for fun" position determination.

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