Phase Synchronization Network Construction Method Based on Coherent Accumulation

To ensure high coherent signal accumulation for distributed space-borne radar, this paper proposes a multi-node phase synchronization network construction method. Firstly, based on the principle of maximum output energy; we derive an objective function to achieve multi-node coherent accumulation optimization. Secondly, the objective function is simplified mathematically combined with the procedure of node to "node to node" phase synchronization and the statistical features of residual phase error. The reduction reveals the internal linkage between the optimal coherent accumulation and the architecture of synchronization topology. Then, the issue is transformed to a network tree hierarchy problem, of which the strategy if to generate a network tree with minimum levels. Finally, the distributed space-borne radar synchronization network is constructed with greedy algorithm. Simulation results show that the proposed method is optimal for distributed radar coherent accumulation and improves the radar's target detection capabilities.