Space Time Code Design in Phased-MIMO Radars to Achieve High Resolution in Board and Velocity
Subject Areas : electrical and computer engineeringRoholah Vahdani 1 , Hossein Khaleghi 2 , Mohsen Fallah Joshaghani 3
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Keywords: Space-time code, phased-MIMO radar, resolution, ambiguity function, non-linear programming,
Abstract :
In this paper, space-time codes for MIMO radar are used to achieve high resolution at target range and speed. The two-dimensional ambiguity function is known as a tool to compare radar performance in terms of resolution. A space-time code can be designed based on minimizing the distance between the actual target parameters in range, speed and angle. For this purpose, high resolution can be achieved by analyzing the ambiguity function and narrowing it down as much as possible. In this paper, the ambiguity function with two variables of amplitude and speed mismatch is considered and a new criterion to achieve high resolution performance in this field is proposed. In this case, by optimizing the proposed cost functions, the optimal space-time code is extracted. The proposed design can also be extended to phased-MIMO radar. The simulation results also show that our proposed scheme has a very narrow ambiguity function around the origin, while it has a performance very close to the optimal state in terms of target identification probability.
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