Considering the urgent need for the construction of marine ship defense system under the new situation and the present condition about rapid development of unmanned system swarm technology as a new type of threat,a kind of defense concept and alternative solution from the aspects of the detection and interception in a setting of marine ship encountering the threat of unmanned aerial vehicle (UAV) swarms and UUV is proposed unmanned underwater vehicle swarms.In detail,different defense concepts under the circumstances of air and underwater are given from two perspectives of defense strategy which are passive defense after alarming and active defense for pre-detecting.what’s more,the relevant technologies involved in the defense concept is explained,suggestions about corresponding development and the key technologies which need to be solved are given.The conception has a positive reference value and practical significance for the future ship defense system,and provides preliminary and feasible research ideas for the future ship equipment construction.

Considering the two issues of range migration and Doppler spectrum extension in the detection of high maneuvering targets in space-air based bistatic radar (SABBR), and on the basis of the establishment of the echo signal model and the analyses of the signal migration feature, a novel target detection algorithm suitable for SABBEWR is proposed. The Keystone transform is used to compensate the range migration in range frequency slow time domain, and the discrete chirp-Fourier transform (DCFT) is modified to estimate the target's acceleration and frequency divisor. A quadratic phase compensation function is constructed to make up for the Doppler migration. The coherent integration is performed for target detection. Simulation results show that the radial acceleration is estimated precisely, the energy of the high maneuvering target is accumulated effectivelly, and the performance detection is improved in low signal to noise ratio background.