Weak target detection and speed estimation method for step frequency radar

The invention belongs to the technical field of radar identification, and particularly relates to a weak target detection and speed estimation method for a step frequency radar. The method comprises the following steps: firstly, grouping signals subjected to pulse compression, dividing pulses with the same carrier frequency into the same group, and performing RFT (Radio Frequency Transform) on the pulses in the group to realize coherent accumulation; carrying out coherent accumulation on an accumulation result between the groups; carrying out splicing dimension reduction processing on a result after inter-group coherent accumulation; and finally, the estimated speed and the HRRP of the target are obtained through detection. According to the method provided by the invention, full-coherent accumulation of a high-speed weak target can be realized, the precision of speed estimation and the effectiveness of target detection are ensured, the target HRRP can be obtained without motion compensation and synthetic broa