Design Application of Frequency Diverse Array in Secondary Radar

doi:10.3969/j.issn.1009-086x.2025.04.012

Abstract

Abstract:

To enhance the combat survival ability of secondary radar， the application of frequency diverse array in secondary radar is proposed， making use of the distance-angle-time coupling characteristics of frequency diverse array. The method of digital baseband composite frequency offset is used to reduce the implementation cost and complexity of FDA； optimize the beam sidelobe through differential logarithmic frequency offset to achieve the irradiation of dot-shaped beam at specific positions， improving the covertness and security of signal transmission； and propose the optimization design method of long dwell beam based on time-varying weighting to ensure the effective reception and recognition probability of secondary radar signals. The application research of FDA in identifying secondary radar lays the foundation for the development of new equipment and also provides reference for other system applications.

Key words: frequency diverse array, distance-angle-time coupling characteristics, array channel design, dot-shaped beam, beam agility

摘要：

为提升识别二次雷达防侦收、抗截获能力，利用频控阵天线波束距离-方位-时间多维耦合特性，提出了频控阵识别二次雷达应用总体思路。采用数字基带复合频偏控制方法，降低频控阵阵列通道实现成本和复杂度；通过差异对数频偏优化波束旁瓣，实现对特定位置点状波束的照射，信号发射更隐秘、更安全，提高防侦收、截获的能力；提出基于时变加权的长驻留波束优化设计方法，确保识别二次雷达通信信号的有效接收和识别概率达成。频控阵识别二次雷达的应用研究为新型装备的研制奠定基础，也为其他系统应用提供借鉴和参考。

关键词: 频控阵天线, 距离-方位-时间多维耦合, 阵列通道设计, 点状波束, 波束捷变

CLC Number:

TN958

Zhenmei KANG. Design Application of Frequency Diverse Array in Secondary Radar[J]. Modern Defense Technology, 2025, 53(4): 112-120.

康振梅. 频控阵在识别二次雷达中的设计应用[J]. 现代防御技术, 2025, 53(4): 112-120.

Figures/Tables 11

Fig. 1 Array element signal of FDA

Fig. 2 Beam patterns of phased array and FDA

Fig. 3 Beam illumination diagrams of FDA at different times

Fig. 4 Block diagram for the design of FDA secondary radar

Fig. 5 Design scheme of transmission channel for FDA

Fig. 6 Variation curve of beam gain error with frequency error

Fig. 7 Antenna beam with different linear frequency offset

Fig. 8 Antenna beam with different element spacing

Fig. 9 Dot-shaped beam of FDA

Fig. 10 Beam illumination of point O at different times

Fig. 11 Schematic diagram of transmit beam agility

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