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This article proposes a cooperative jamming (CJ) architecture based on the coded signal of interest (SOI). The CJ is superimposed on the coded SOI directly at the transmitter, and the authorized user reconstructs the received signal and cancels the CJ based on the prior knowledge of the coding information, then different radiation patterns after cancellation are created for SOI and CJ, which effectively cancels CJ while retaining SOI. Eavesdropper, however, is unaware of the coding information and will cause significant loss to the SOI while cancelling the CJ, therefore unable to achieve eavesdropping on communication signals. Numerical results verify the feasibility of the proposed method.This article proposes a cooperative jamming (CJ) architecture based on the coded signal of interest (SOI). The authorized user reconstructs the received signal and cancels the CJ and retains the SOI based on the prior knowledge of the coding information. Eavesdropper, however, will cause significant loss to the SOI while cancelling the CJ, therefore unable to achieve eavesdropping on communication signals [ABSTRACT FROM AUTHOR]

In radar detection of multiple targets, the large difference in echo energy of coexisting targets leads to the phenomenon that strong targets cover weak targets. To tackle this problem, a peak self-seeking track before detect (TBD) algorithm based on parallel line coordinate transformation is proposed. By comparing the sum of the maximum energy of measurement point in the parameter unit where each measurement point is located after accumulation, the unit with the maximum energy accumulation value is found, by which a new binary accumulation result is formed. Then peak value extraction, track back-tracking, and track correction are performed with the threshold. The simulation results show that the improved algorithm has a high global detection probability for multiple targets, and can initiate multiple targets with different echo energies. [ABSTRACT FROM AUTHOR]