Nonlinearity in the frequency modulation of the transmitted pulse of a homodyne linear-FM radar will degrade performance. Analysis and computer simulation were performed which provide quantitative results of the effects of nonlinearity on resolution and signal levels obtained from returns from point targets. The anlaysis is based on the expansion of the phase modulation of an individual transmit pulse in a power series in time. Input quantities to the model include magnitudes of non-linearity coefficients, radar parameters, range to target. Experimental data obtained with a laser radar was analyzed and the measured deviation of the frequency modulation from linearity used to predict performance at arbitrary target ranges. Statistical studies of the experimental data yielded information on the consistency of the nonlinearity. Range images obtained with the system are presented which show better than 1 m single-look range resolution.