基于频控阵的多普勒波束锐化高度表设计

doi:10.12305/j.issn.1001-506X.2021.09.02

Abstract

Abstract:

Doppler beam sharpening (DBS) is an important technology for aircraft to implement terrain following or terrain avoidance. Aiming at the radio frequency (RF) stealth requirement of the altimeter in the aircraft working under the DBS mode, this paper uses frequency diversity array (FDA) to study the DBS altimeter based on RF stealth. Firstly, the influence of the frequency increment dependence characteristic and distance periodicity of the FDA on the DBS mode is analyzed, by studying the characteristics of the FDA radiation pattern. Based on this, the constraint conditions for the DBS altimeter are given, including the frequency increment between FDA array elements, pulse repetition frequency, pulse width and so on. Meanwhile, the RF stealth model of the FDA-DBS altimeter is established. Simulation shows that the DBS altimeter based on FDA has the best RF stealth performance, compared to phased arrays and multiple input multiple output arrays.

Key words: radio frequency stealth, altimeter, frequency diversity array, Doppler beam sharpening

CLC Number:

TN959.73

Shanyue DOU, Fei WANG, Weiqiang YU, Jianjiang ZHOU, Jun CHEN. Design of Doppler beam sharpening altimeter based on FDA[J]. Systems Engineering and Electronics, 2021, 43(9): 2383-2391.

Figures/Tables 13

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References 25

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参数名称	取值
发射阵元个数	8
接收阵元个数	8
基准阵元频率/GHz	9.6
发射信号波长/m	0.03
阵元间距/m	0.015
频率增量/kHz	10
发射信号带宽/MHz	80
发射信号脉冲宽度/μs	10
脉冲重复频率/kHz	5
采样频率/MHz	100
接收天线角度/(°)	4
3 dB波束宽度/(°)	4.5
锐化比	64
飞行速度/(m/s)	150
景深中心斜径/km	20
飞行高度/km	15
覆盖方位角/(°)	0~30

参数名称	取值
高度表辐射功率/W	5
发射天线增益/dB	15
截获天线增益/dB	10
系统噪声系数/dB	5
玻尔兹曼常数/(J/K)	1.38×10^-23
标准噪声温度/K	290
传播损耗系数/(dB/km)	0.012 8
虚警概率	10^-6
截获接收机带宽/MHz	200

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Design of Doppler beam sharpening altimeter based on FDA

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