unwrap() command resulting in phase bump

2019 9 19
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更新时间：2019 9 19
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I have raw phase and gain data where the phase data wraps at 90deg (expected). When I tried to unwrap the data for plotting I noticed a "bump" in the phase that did not seem consistent with the phase trajectory.
% Unwrap the phase data
phase_deg = unwrap(phase_deg, 90);
I then manually unwrapped the data at 90 degrees and the result is what I expected from unwrap.
% Unwrap the phase data
if(phase_deg(ii) > 90 )
phase_deg(ii) = phase_deg(ii) - 360;
end
I'm not sure what I'm misunderstanding in how to use unwrap, or why it is not handling my data as expected.
See image below for the data:freqResp_unwrap_comp.png

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