Modern radar systems employ multiple transmit antennas on transmit and multiple receive antennas on receive to improve many aspects of the system performance including improved target detection performance, improved angle estimation accuracy, decreased minimum detectable velocity. However these advantages are obtained only when orthogonal probing waveforms are emitted from each of the transmit antenna elements. These waveforms further need to have good autocorrelation and crosscorrelation properties for good range resolution and multiple target return separability. Many previous works presented noise-like pseudo random phase coded waveforms with good correlation properties. However these waveforms suffered from limited family size, zero-lag non-orthogonality and hence non uniform distribution of transmit power in space. This paper presents the design of phase coded pulse waveforms with good correlation properties, zero-lag orthogonality property, delay and add property that support Doppler compensation, large family size, simpler generation, constant modulus etc.

Multiple Input Multiple Output Radar four phase waveforms orthogonal transmit waveforms uniform transmit beampattern