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Frequency modulated RF pulses with square envelopes are synthesized to mismatch a specified inhomogeneous ionized medium. These pulses when incident on the ionized medium result in compressed and enhanced reflected signals. Three ionization profiles, which are usually used to model the lower part of the ionosphere, are considered. The frequency modulation of the incident pulses that mismatch an ionized medium is found to depend on the ionization profile, the incidence angle, and frequency range used.