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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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