通道幅相差的存在会导致直接定位算法(DPD)精确度下降。分析了通道幅相差对多阵列直接定位算法的影响，并在通道幅相差存在的情况下提出了一种改进算法。该算法利用各阵列通道幅相差的校正结果对阵列流型矢量进行补偿，然后用直接定位算法估计目标位置。仿真表明该算法较之无校正直接定位算法，具有更高的精确度。

In order to solve the problem of accuracy decrease of Direct Position Determination(DPD) in the presence of gain-phase error, the effect of the gain-phase error on the DPD algorithm is analyzed, and an improved DPD algorithm with gain-phase error is introduced. In this algorithm, array response vector is compensated by the correction results of gain-phase error, and the target location is estimated by DPD algorithm. Simulation result shows that the improved algorithm has higher accuracy than the DPD algorithm without correction.