首先对超宽带线性调频信号进行脉冲压缩处理得到短脉冲信号，在详细阐述BP算法原理的基础上，利用此短脉冲信号推导其BP算法成像公式；然后将子孔径思想应用于BP算法，得到一种快速BP(FBP)算法；最后对BP算法和FBP算法的计算量进行理论分析，同时结合点目标和多点目标应用BP算法和FBP算法分别成像，给出两种算法成像所花费的时间，其结果证明了FBP算法的快速性和有效性。

In this paper, the UWB chirp pulses are processed by pulse-compression and short pulses are abtained. Using them, the imaging formula is derived according to detailed explanation of the BP theory. Then by applying sub-aperture theory to the BP algorithm, a fast BP algorithm is developed. Finally the computation amount of BP and FBP algorithms are theoretically analyzed and at the same time spot target and multi-spot targets are imaged by applying these two algorithms and the time spent on imaging are obtained. The speediness and validity are verified by computed results.

TN957.52