Abstract:

Overthehorizon radar (OTHR) looks down its targets from the ionosphere. Compared with conventional radar systems, it has superiorities, such as large observing range, wide cover areas, anticoncealed capability. But signal echoes are usually contaminated by transient interference. To filter out the interference is available while it destroys the integrity of signals in time domain. What is more, a modern OTHR system is usually required to be multimode and is able to detect multitarget simultaneously under different backgrounds. To satisfy these requirements, an incontinuous sampling mode is usually applied resulting in parts of signal missing. A novel algorithm is proposed to reconstruct the full spectrum of OTHR with partial clear signals. The spectrum reconstruction problem is shifted into a problem of a norm l constrained optimal problem. By solving this problem with a greedy algorithm efficiently, the integrate frequency spectrum of OTHR signals is reconstructed optimally. Both simulated and real measured data are used to validate the proposal.