Abstract
MIMO radar with widely separated antennas enhances detection and estimation resolution by utilizing the diversity of the propagation path. Each antenna of this type of radar can steer its beam independently towards any direction as an independent transmitter. However, the joint processing of signals for transmission and reception differs this radar from the multistatic radar. There are many resource optimization problems which improve the performance of MIMO radar. But power allocation is one of the most interesting resource optimization problems. The power allocation finds an optimum strategy to assign power to transmit antennas with the aim of minimizing the target tracking errors under specified transmit power constraints. In this study, the performance of power allocation for target tracking in MIMO radar with widely separated antennas is investigated. Therefore, a MIMO radar with distributed antennas is configured and a target motion model using the constant velocity (CV) method is modeled. Then Joint Cramer Rao bound (CRB) for target parameters (joint target position and velocity) estimation error is calculated. This is utilized as a power allocation problem objective function. Since the proposed power allocation problem is nonconvex. Therefore, a SQP-based power allocation algorithm is proposed to solve it. In simulation results, the performance of the proposed algorithm in various conditions such as a different number of antennas and antenna geometry configurations is examined. Results affirm the accuracy of the proposed algorithm.
Highlights
The RADAR is a short form of Radio Detection And Ranging
There are some challenges in the power allocation problem for target tracking in multi-input multioutput (MIMO) radar with widely separated antennas which are not investigated in other papers and we consider them in this paper
In other researches about power allocation for target tracking in MIMO radar with widely separated antennas, joint estimation is not worked
Summary
Radar utilizes electromagnetic waves to detect, locate and measure the speed of reflected objects It transmits the electromagnetic waves into space and receives the echo signals [1,2]. The target is seen from different angles by antennas In this type of radars, each receiver should receive all signals from all transmitters and emit them to the central processor. This means that each receiver does not process or make a decision individually and sends its signals to the central processor to process all signals This feature is the main difference between multi-static and MIMO radar with widely separated antennas. Power allocation is usually performed in radar networks to find the Darzikolaei, Mollaei & Najimi, SQP-based Power Allocation Strategy for Target Tracking in MIMO Radar Network
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