Range-angle performances of coherent MIMO long-range radars

Active antennas and modular generation and reception opens the way to radar systems where different waveforms are simultaneously transmitted and received through multiple channels (MIMO radars). Such an increase in the degrees of freedom is shown to allow improvements in angular resolution compared to standard wide beam. It can also be used to optimize the trade-offs between angular and range resolution and sidelobes. In this paper, the basic properties are analyzed on a new class of space-time circulating codes adapted to 2D antennas, and the benefits are demonstrated through fair comparisons of transmit/receive ambiguity functions.