  Phased multiple-input multiple-output (Phased-MIMO) radar has received
increasing attention for enjoying the advantages of waveform diversity and
range-dependency from frequency diverse array MIMO (FDA-MIMO) radar without
sacrificing coherent processing gain through partitioning transmit subarray.
This two-part series proposes a framework of electronic countermeasures (ECM)
inspired by frequency diverse array (FDA) radar, called FDA jamming, evaluating
its effectiveness for countering airborne phased-MIMO radar. This part
introduces the principles and categories of FDA jammer and proposes the FDA
jamming signal model based on the two cases of phased-MIMO radar, phased-array
(PA) radar and FDA-MIMO radar. Moreover, the effects of FDA jamming on matched
filtering and spatial filtering of PA and FDA-MIMO radar are analyzed.
Numerical results verify the theoretical analysis and validate the
effectiveness of the proposed FDA jamming in countering phased-MIMO radar.
