A super‐resolution imaging method in connection with spectral synthesis is presented. The basic idea is to apply the sampling theorem to the heterodyned signal in the frequency domain and to estimate the data obtainable within a wide frequency range through matrix calculation, using the data obtained within a narrow bandwidth. The principle and some practical problems in the use of this method, such as the required number of the raw data and the effect of additive noise in the received signal, are described theoretically, and the effectiveness of super‐resolution in range is demonstrated by using the results of computer simulation and laboratory experiment.