Research on the Design Method of Low Intercepting Point-like Beam of Radio Fuze Based on FDA-MIMO

doi:10.12382/bgxb.2024.1122

Abstract

Abstract:

At present,the radio fuzes are facing a severe information-based jamming environment.To ensure that radio fuzes can stably exert their damage effectiveness on the battlefield,the anti-information-based jamming-related technologies have become a research hotspot in the field of anti-jamming for radio fuzes.Based on the working process of fuze jammer,which first intercepts and then retransmits jamming signals,it is focused on the design of low intercepting point-like beam of radio fuze.A design principle of low intercepting point-like beam for radio fuzes based on the frequency diverse array (FDA)-multiple-input multiple-output (MIMO) is proposed on the basis of the unique S-shaped curved array pattern of FDA-MIMO technology.The impact of the frequency offset setting of array elements on beam synthesis is studied after analyzing the beam function of FDA-MIMO.A larger beam amplitude is achieved within a small neighborhood with Δr as radius in the vicinity of the peak point by setting a peak point and a power drop point within a relatively close distance Δr,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 method of the low intercepting point-like beam with the frequency offset setting formula of array elements as the core is obtained.Simulationed reults show that,under the guidance of the proposed low intercepting point-like beam design method,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 proposed design method provides theoretical support for the low intercepting point-like 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: frequency diverse array-multiple-input multiple-output, radio proximity fuze, low intercept, point-like beam design method

JIA Jinwei, GAO Min, HAN Zhuangzhi, WANG Yi, MENG Shuo, LI Chaowang. Research on the Design Method of Low Intercepting Point-like Beam of Radio Fuze Based on FDA-MIMO[J]. Acta Armamentarii, 2025, 46(9): 241122-.

Figures/Tables 18

Fig.1 Schematic diagram of FDA transmitting array

Fig.2 Comparison diagram of FDA-MIMO transmitting beam affected by array element frequency offset

Fig.3 Comparison of array patterns of frequency-controlled array and phased array

Fig.4 Logical diagram of derivation proof

Fig.5 Schematic diagram of low intercepting point-like beam design method

Table 1 Simulation parameter setting

仿真参数	数值
阵元数量	10
基础频率/GHz	10
各阵元频偏/MHz	0,-50.80,-51.10,-51.34, -51.64,-52.42,-52.83,-53.17, -53.27,-54.66
点状波束期望角度/(°)	45
点状波束期望距离/m	50

Fig.6 Three-dimensional beam diagram and its top view,section view

Table 2 Simulation parameter setting

仿真参数	数值
阵元数量	10
基础频率f₀/GHz	3
对数频偏情形各阵元频偏/Hz	0,3466,5493,6931,8047,8959,9729,10397,10986,11513
立方指数频偏情形各阵元频偏/MHz	0.005,0.040,0.135,0.320,0.630,1.080,1.720,2.560,3.650,5.000
倒数频偏情形各阵元频偏/MHz	5.00,2.50,1.70,1.25,1.00,0.83,0.70,0.63,0.56,0.50
本文方法各阵元频偏/MHz	0,45.7,46.1,46.3,47.2,47.5,47.7,47.8,48.0,48.2

Fig.7 FDA-MIMO beam pattern with logarithmic frequency offset method

Fig.8 FDA-MIMO beam pattern with cubic exponential frequency offset method

Fig.9 FDA-MIMO beam pattern with reciprocal frequency offset method

Fig.10 The FDA-MIMO beam pattern of the proposed method

Table 3 Point-like beam performance comparison

方法	PSR	HPBWDD/m	HPBWAD/(°)
对数频偏方法	0.54	1.62×10⁴	11.8
立方指数频偏方法	0.58	33	11.0
倒数频偏方法	0.87	3.87×10⁴	21.4
本文方法	0.41	1	9.0

Fig.11 Simulated results of beam entropy

Table 4 The optimal beam entropy in different simulation cases

对数频偏方法	立方指数频偏方法	倒数频偏方法	本文方法
14.81	11.52	12.41	10.85

Fig.12 Airspace low intercepting performance modeling

Table 5 Simulation parameter setting of airspace low intercepting performance

仿真参数	数值	方法	波束宽度/(°)
引信落角/(°)	15	对数频偏方法	11.8
离地高度/m	100~3700	立方指数频偏方法	11.0
干扰机分布密度/m^-2	0.0005	倒数频偏方法	21.4
单个干扰机的截获概率	0.7	本文方法	9

Fig.13 Simulation results of low intercepting performance of radio fuze beam space

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