Abstract
In this paper, a type of effective electronic counter-countermeasures (ECCM) technique for suppressing the high-power deception jamming using an orthogonal frequency division multiplexing (OFDM) radar is proposed. Concerning the velocity deception jamming, the initial phases of the pulses transmitted in a coherent processing interval (CPI) are designed to minimize the jamming power within a specific range, forming a notch around the jamming in the Doppler spectrum. For the purpose of suppressing the range deception jamming and the joint range-velocity deception jamming, the phase codes of the subcarriers belonging to the OFDM pulses are optimized to minimize the jamming power, distributing some specific bands in the range and the range-velocity domain, respectively. According to Parseval’s theorem, the phase encoding, acting as the coding manner of the OFDM subcarriers can ensure that the energy of each OFDM symbol stays the same. It is worth noticing that the phase codes of the OFDM subcarriers can influence the peak-to-average power ratio (PAPR). Thus, an optimization problem is formulated to optimize the phase codes of the subcarriers under the constraint of global PAPR, which can regulate the PAPRs of multiple OFDM symbols at the same time. The proposed problem is non-convex; therefore, it is a huge challenge to tackle. Then we present a method named by the phase-only alternating direction method multipliers (POADMM) to solve the aforementioned optimization problem. Some necessary simulation results are provided to demonstrate the effectiveness of the proposed radar signaling strategy
Highlights
The electronic countermeasures (ECM) have experienced a rapid development with the military radar over the past three decades [1,2]
We present the signal models based on a monostatic orthogonal frequency division multiplexing (OFDM) radar with the ability of pulse diversity in the presence of the different types of deception jamming
Since the variation of the phase codes of the subcarriers (PCSs) caused the change of the pulse peak-to-average power ratio (PAPR), the OFDM pulses are supposed to be optimized under the constraint of the global PAPR
Summary
The electronic countermeasures (ECM) have experienced a rapid development with the military radar over the past three decades [1,2]. In these two cases, two optimization problems are, respectively, formulated for the first time, and both of them comply with the criterion of minimizing the jamming energy near the false targets by designing the phase codes of the subcarriers (PCSs) of the OFDM pulses. Two optimization problems are, respectively, formulated for the first time, and both of them comply with the criterion of minimizing the jamming energy near the false targets by designing the phase codes of the subcarriers (PCSs) of the OFDM pulses They boil down to the same kind of non-convex optimization model. The operators, Diag(·) and diag(·), are, respectively, the diagonal matrices formed by the entries of the vector argument and the column vector containing the principal diagonal of the matrix argument. 5 denotes the gradient operator and vec(·) represents the vectorization of an input matrix
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