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This paper provides a method for estimating peak power for impulse-radio ultra-wideband signals. By analyzing the required measurement procedure, a set of equations is derived, which are verified with simulated and measured results. The IEEE 802.15.4a standard is used as an example. The idiosyncracy of IEEE 802.15.4a is the usage of bursts of pulses. Hence, we in this paper propose a method to correctly analyze it. The deviation from the established calculation is shown together with the advantages of using this new method, which is valid for both frequency- and time-domain analysis. The latter turns out to be the preferred way of working. Using the proposed method enables usage of up to 16-24 dB more pulse amplitude, depending on the equipment available and burst width used.