频率分集阵列的距离角度解耦的波束形成&nbsp;(in English)

项喆; 陈伯孝

doi:10.12000/JR16113

Range-angle Decoupled Transmit Beamforming with Frequency Diverse Array (in English)

doi: 10.12000/JR16113

Xiang Zhe,
Chen Baixiao^,

National Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China

Funds: The National Natural Science Foundation of China (61571344), Shanghai Academy of Spaceflight Technology (SAST2015064, SAST2015071)

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Author Bio:
Xiang Zhe was born in Anhui, China in 1992. He received the Bachelor Degree in 2009 from Xidian University. He is currently working toward his Ph.D. degree in Signal Processing at National Laboratory for Radar Signal Processing of Xidian University. His major interests are frequency diverse radar, polarimetric radar, and interference suppression. E-mail: xzysn152@163.com

Chen Baixiao was born in Anhui, China in 1966. He received the Master degree and the Ph.D. degree in 1994 and 1997, respectively, from Xidian University. He is a professor with National Laboratory for Radar Signal Processing of Xidian University. His research interests include array signal processing and polarimetric radar. E-mail: bxchen@xidian.edu.cn

Corresponding author: Chen Baixiao. E-mail: bxchen@xidian.edu.cn

摘要

摘要:
常规频率分集雷达(FDA)在发射阵元采用均匀的频率间隔，从而可以形成距离-角度耦合的波束方向图。但是该方向图在多个距离上均形成多峰值波束，当干扰位于任一波束最大指向的距离时，将会带来信干噪比损失。针对上述问题，该文通过分析波束形成的表达式，从原理上提出一个关于频率分集雷达阵列配置的基本原则，能够在指定的距离角度范围内，形成单峰值的波束方向图。几种特例和仿真结果均证明了该原则的有效性。
- 频率分集雷达 /
- 距离-角度耦合 /
- 单峰值波束 /
- 阵列配置
Abstract:
It has been shown that Frequency Diverse Arrays (FDA) exhibit a range-angle dependent beam steering feature by employing a uniform frequency increment across the array elements. However, this beam pattern generates maxima at multiple range values, possibly leading to loss of signal-to-interference-plus-noise ratio when the interferences are located at any of the maxima. Herein, we prove that the beam pattern of FDA is range-periodic and propose the basic criteria for the FDA configuration to decouple the range and angle. In an illuminated space, a single-maximum beam pattern can be obtained by configuring the frequency increment between the elements. Specific examples have been discussed herein, and the simulation results verify the proposed theory.
- Frequency Diverse Arrays (FDA) /
- Range-angle-dependent /
- Single-maximum beampattern /
- Configuration

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Figure 1. FDA configuration

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Figure 2. The range-angle distribution diagram for different element

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Figure 4. Range and angle section views of beampattern

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Figure 5. Range versus angle normalized beampattern (target position at (400 km, 20°))

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Figure 3. Range versus angle normalized beampattern

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Table 1. Parameters for simulations

Parameter	Value	Parameter	Value
Element number M	8	d	0.1 m
Reference frequency f₀	1 GHz	b	1.4
{\Delta}f	1 kHz	Desired point ( \theta_0, r₀)	(0°, 400 km)

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