集中式多输入多输出雷达等效阵列增益推导

为便于分析集中式多输入多输出雷达性能,给出了一种集中式MIMO雷达等效阵列增益的近似推导.分析了集中式MIMO雷达阵列处理输出信号相对于匹配滤波器输出信号的信噪比提高因子,推导了SISO雷达和MIMO雷达阵列输出信号的信噪比公式,在此基础上,给出了集中式MIMO雷达阵列等效合成增益表达式,并对结果进行了仿真分析.仿真结果表明,阵元数增加一倍,相控阵雷达阵列增益增加3.0dB,而集中式MIMO雷达等效阵列增益只增加1.5dB.集中式MIMO雷达可通过长时间积累的方法来解决由于阵列等效增益减小带来的检测性能下降问题.

Derivation of Colocated Multiple-Input Multiple-Output Radar Equivalent Array Gain

To evaluate the detection performance of colocated multiple-input multiple-output (MIMO) radar, this paper proposes an approximate derivation of colocated MIMO radar equivalent array gain. First, the signal-to-noise ratio (SNR) improvement factor of the colocated MIMO radar array output from coherent integration perspective was analyzed. Then, the array output's SNR expression was derived. Eventually, the colocated MIMO radar equivalent array gain could be achieved via comparing the array output's SNR expressions of colocated MIMO and SISO radar. Simulation shows that, if the number of array element is increased two times, the array gain of phased-array radar would be increased by 3.0 dB, while the colocated MIMO radar would just be increased by 1.5 dB. It seems that, in order to achieve the same detection performance as phased-array radar, the colocated MIMO radar could use long-time integration method to compensate the loss of equivalent array gain.