基于截获因子评价的双基前视SAR成像LPI设计

降低雷达辐射信号被截获概率，是保障机载平台战场生存与作战效能发挥的重要方面。本文结合双基雷达在低截获（LPI）方面的优势，提出了基于截获因子评价的移不变双基前视条带合成孔径雷达（SAR）成像LPI探测设计方法。考虑利用截获因子评价双基SAR成像的LPI性能，针对移不变双基前视条带SAR成像模式，简要分析了成像分辨率，推导了截获因子表达式，在保证成像性能前提下，以降低截获因子为目标设计了LPI探测方法，并进行了仿真验证。实验结果表明，本文提出的方法能明显改善机载火控雷达SAR模式的抗截获性能。

LPI Design for Bistatic Forward-Looking SAR Imaging Based on Intercept Factor Evaluation

Reducing the intercept probability of radar emitter signals is important to improve the battle survivability and operational effectiveness of airborne platform. In this paper, combining the advantages of bistatic radar in low probability of intercept(LPI) aspect, the LPI design method for shift-invariant bistatic forward-looking stripmap synthetic aperture radar(SAR) imaging based on interception factor evaluation is proposed to improve the anti-interception performance. Interception factor is considered to evaluate LPI performance of bistatic SAR imaging. Firstly, in allusion to the shift-invariant bistatic forward-looking stripmap SAR imaging mode, we briefly analyse the imaging resolution and derive the expression of interception factor. Then, on the premise of keeping imaging performance, we design the LPI detection method to reduce interception factor. Finally, simulation experiments are performed. The experiment results show that the proposed method can obviously improve the anti-interception performance of SAR mode of airborne fire control radar.