Abstract:

The interference between military very high frequency (VHF) radios in the same vehicle is producing more trouble with the increasing complication of the tactical command and control system. A radio frequency (RF) interference cancellation method based on exploring the mutual near-field coupling between antennas, is proposed to cancel the mutual interference of radios on the co-vehicle. In addition, an analytical expression is derived to reflect the relationship between coupling calculation error and convergence time of the system. This method builds the near-field analysis model between transmitting and receiving antennas over one vehicle in advance, meanwhile, the mutual coupling and phase distortion are deduced. Then the calculation result is utilized to set the original parameters of the adaptive interference canceling chain, and efficiently cancel the RF interference. Finally, the simulations verify that the system convergence time is 30% less than that of the existing adaptive cancellation method, and prove the validity of the analytical expression reflecting how the coupling calculation error impairs system convergence time.