Improvement of IFM receivers' accuracy using the hybrid method based on the MMSE algorithm

This article proposes a hybrid method to calculate the frequency in the instantaneous frequency measurement (IFM) receivers. This method improves the frequency accuracy of the corresponding receiver by performing a process of effective and targeted signal operation can provide the basis for improving the efficiency of the intelligent function of all types of ground-based and air-based jammers. To efficiently process the output data of IFM discriminators and increase the accuracy of frequency measurement, instead of the previous methods that usually change the structure of the separator in the RF field, new ideas in the digital field such as minimum mean square error (MMSE) algorithm is used. In this research, using a special combined method based on the MMSE algorithm and related optimization, frequency accuracy with RMS error of 2.1582 MHz in 2 GHz bandwidth is achieved in IFM receivers.
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