beam pattern design in phased mimo radars for known target locations

multiple input multiple output (mimo) radars are new generation of array radars that employ orthogonal waveforms for their transmit probing signals. despite of several advantages, this strategy results in transmission of uniform power in all angle of array’s viewing field. therefore, possibility of transmit beamforming and achieving coherent processing gain will be lost. many efforts have been made to overcome this week point by modifying the correlation of transmit signals. recently, new proposed phased mimo radar partitions the transmitting array into a number of subarrays, each of which is allocated a waveform that is orthogonal to the waveforms transmitted by other subarrays. in this radar, designing the weight vectors of each sub array, provides a means of forming desired beam pattern. this paper proposes a method for selecting weights based on conventional beamforming to maximize power around targets of interest. unlike method used for mimo radars, in this procedure both transmitted power from antennas and distribution of power among targets can be controlled and desired beam pattern is obtained with less calculation and less orthogonal waveforms. the method will also be extended to planner array.