关键词: FDA-MIMO, 无线电近炸引信, 低截获, 点状波束设计原理

Abstract: At present, radio fuzes are facing a severe information-based jamming environment. To ensure that radio fuzes can stably exert their damage effectiveness on the battlefield, technologies related to anti-information-based jamming have become a research hotspot in the field of anti-jamming for radio fuzes. Based on the working process of the fuze jammer, which first intercepts and then retransmits jamming signals, this paper focuses on the low probability of intercept (LPI) beam design of radio fuzes. Combined with the unique "S"-shaped curved array pattern of the Frequency Diverse Array (FDA) - Multiple-Input Multiple-Output (MIMO) technology, it explores the design principle of the LPI point-like beam for radio fuzes based on FDA-MIMO. After analyzing the beam function of FDA-MIMO, it concentrates on the key point of the impact of the frequency offset setting of array elements on beam synthesis. By setting the peak point and the power drop point within a relatively close distance range ( ), the goal is achieved that the beam amplitude is relatively large within a small neighborhood with a radius of within the vicinity of the peak point, while the beam amplitude drops rapidly in other ranges. Then, the frequency offsets of each array element are calculated by using the beam function, and the design principle of the LPI point-like beam with the frequency offset setting formula of array elements as the core is obtained. Simulations show that under the guidance of the LPI point-like beam design principle proposed in the paper, the FDA-MIMO beam has a range dimension half-power beam width of 1 meter and an angular dimension half-power beam width of 9 degrees. Its beam convergence performance and LPI performance are significantly better than those of other classic frequency offset setting methods. The design principle proposed in the paper provides theoretical support for the LPI beam design of radio fuzes based on FDA-MIMO, which can improve the LPI performance of radio fuzes and better exert their battlefield damage effectiveness.

Key words: FDA-MIMO, radio proximity fuze, low intercept, principles of point-like beam design