基于低存储量的相控阵指向精度优化

doi:10.16180/j.cnki.issn1007-7820.2025.05.008

Abstract

Abstract:

In view of the contradiction between high pointing accuracy requirement and low storage requirement, a method of obtaining phase shifter value based on linear interpolation is proposed in this study. A small step sweep is performed under the premise of the storage capacity of a large step sweep. The relationship between the sweep accuracy and the required storage capacity is calculated, and the feasibility of linear interpolation is analyzed. The position data and angle data in the phase shifter value are scaled differently, and the performance of the proposed algorithm is evaluated using three quantitative indexes including Phase shifter value error, pattern error and beam pointing error. The results show that the wave control memory is reduced by 98%, the phase shifter error is less than 1°, the pattern error is less than 20 dB, and the beam pointing error is less than 0.1°.

Key words: phased array antenna, phase shifter value, linear interpolation, pointing accuracy, beam forming, storage content, electric scanning, directional pattern

CLC Number:

TN821.8

WANG Yan, ZHAO Peng, LIU Cheng, ZHAO Yongzhi. Phased Array Pointing Accuracy Optimization Based on Low Storage[J].Electronic Science and Technology, 2025, 38(5): 53-59.

Figures/Tables 12

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Table 1.

Size of data matrix"

数据	矩阵维度大小
$360 λ$ y_i	256×1
$360 λ$ z_i	256×1
cos(θ+dθ)sin(ϕ+dϕ)-cosθsinϕ	1 801×1 801
sin(θ+dθ)-sinθ	1 801×1
cosθsinϕ	181×181
sinθ	181×1
总和	3.3×10⁶

Table 1.

Table 2.

Table 3.

Figure 5.

Table 4.

Figure 6.

Table 5.

Figure 7.

References 18

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过程	条件1	条件2	条件3
初始值	10.3	10.3	10.3
缩放倍数	2²	2	2^-2
缩放后值	41.2	20.6	2.575
就近取整	41	21	3
转二进制	101 001	10 101	11
反缩放	1 010	1 010	1 100
转十进制	10	10	12
误差	-0.3	-0.3	1.7

缩放倍数	ky_i	kz_i	二进制所需位数
无	[-1 350.93,1 350.93]	[-1 350.93,1 350.93]	无
1	[-1 351,1 351]	[-1 351,1 351]	12
2	[-2 702,2 702]	[-2 702,2 702]	13
0.50	[-675,675]	[-675,675]	11
0.25	[-338,338]	[-338,338]	10

缩放倍数	d(cossin)	d(sin)	二进制所需位数
无	[-0.008 7,0.008 7]	[-0.008 7,0.008 7]	无
2⁹	[-4.4]	[-4.4]	4
2¹⁰	[-9.9]	[-9.9]	5
2¹¹	[-18,18]	[-18,18]	6
2¹²	[-36,36]	[-36,36]	7

位置数据缩放倍数	角度数据缩放倍数	移相器值误差/(°)	方向图误差/dB	波束指向误差/(°)
0.25	2⁹	1.60	21.27	0.14
	2¹⁰	0.80	14.33	0.14
	2¹¹	0.42	14.33	0.12
	2¹²	0.21	14.33	0.10
0.50	2⁹	1.59	15.31	0.10
	2¹⁰	0.79	12.61	0.06
	2¹¹	0.40	6.32	0.06
	2¹²	0.20	6.32	0.04
1.00	2⁹	1.59	17.20	0.10
	2¹⁰	0.79	10.49	0.06
	2¹¹	0.40	7.20	0.06
	2¹²	0.20	7.20	0.04
2.00	2⁹	1.58	17.21	0.08
	2¹⁰	0.79	10.50	0.06
	2¹¹	0.40	6.60	0.06
	2¹²	0.20	6.60	0.04

Phased Array Pointing Accuracy Optimization Based on Low Storage

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