One measurement of the quality of a linear FM chirp is Impulse Response. The linearity of frequency or phase of the chirp tells part of the story. If a reflection or other time-related mechanism results in a delayed copy of the intended pulse (a secondary pulse) added to the main pulse, a linearity measurements may not easily discover the problem.
Such a secondary pulse can be simultaneously measured for both time delay and relative amplitude by plotting the impulse response of the main chirp pulse. This is functionally equivalent to a TDR using the chirp itself as the excitation signal.
The method described here adds an amplitude correction to such an impulse response measurement so that the amplitude of the secondary pulse relative to the main pulse will be correctly reported throughout the measurable range of delay time.