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This tweet by deep space SDR enthusiast and amateur radio operator Edgar Kaiser @df2mz shows a squiggly tone from MRO.

Mars Reconnaiscance Orbiter (MRO) X-band downlink. The signal shows this kinky behavior due to a specific uplink protocol keeping the uplink signal frequency within the optimum bandpass of the spacecraft's coherent transponder. Distance was 193 million km.

Question: I would like to understand the details of shape of this frequency versus time plot of received signals from MRO.

It runs about 13 minutes long and shows a general quadratic behavior with some superimposed stepping. Is there a name for this, or documentation? How does this relate specifically to MRO's orbit?

CLICK for full size:

enter image description here

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