Coherent Fast Frequency Hopping Doppler Local Oscillator Based on DDS

Abstract

The Coherent Fast Frequency Hopping (CFFH) technique can improve the anti-jamming ability of wireless communication, and the digital local oscillator whose signal is completely coherent with the received signal is an indispensable component. According to the CFFH system model, a method for accurately simulating Fast Frequency Hopping (FFH) carrier is proposed, which has considered both frequency offset and time scaling caused by the Doppler Effect. The structure of the FFH Doppler digital local oscillator is devised referring to the DDS principle and it has been demonstrated by the software radio platform. The results indicate that the frequency offset within ±400KHz can be set on the 15G Radio Frequency (RF) carrier, and the frequency resolution reach 1.3733Hz.