Radio Direction Finding System Based on Polynomial Manifold Interpolation

doi:10.12382/bgxb.2022.0320

Abstract

Abstract:

An anti-mutual coupling radio direction finding system based on the polynomial manifold interpolation algorithm is proposed, which aims to solve the deterioration of DOA estimation performance caused by mutual coupling. Based on the polynomial manifold interpolation DOA estimation algorithm, the system can effectively resist the mutual coupling effect and realize high-precision DF processing under small manifold samples. In the DOA estimation solution of the algorithm, the analytical formula can be obtained by the processing method of multiple precision interval successive approximation search, which avoids exhaustive search in the direction angle domain. On the basis of algorithm theory analysis and simulation, the prototype of the radio direction finding system based on the embedded processor is designed and tested. The test results show that the proposed system can effectively perform DOA estimation in mutual coupling and realize the real-time and reliable direction finding of LTE downlink signals.

Key words: direction finding, array antenna, mutual coupling, polynomial manifold interpolation

CLC Number:

TN822.3

LI Si, LIU Yinsheng, LI Xu, YANG Mingqiang. Radio Direction Finding System Based on Polynomial Manifold Interpolation[J]. Acta Armamentarii, 2023, 44(8): 2486-2494.

Figures/Tables 10

Fig.1 Schematic diagram of antenna array and signal

Fig.2 DOA estimation algorithm based on linear interpolation

Fig.3 Spatial spectrum of multiple signals with the same frequency

Fig.4 DOA estimation performance with different interpolation orders

Fig.5 Performance comparison between linear interpolation and polynomialmanifold interpolation algorithm

Fig.6 DF prototype system

Fig.7 Functional block diagram of software design

Fig.8 DOA estimation algorithm base on polynomial manifold interpolation

Table 1 PL resource utilization

资源类别	消耗量/个	消耗占比/%
查找表	19880	37.37
查找表存储器	3143	18.06
触发器	29619	27.84
块随机存取存储器	88	62.86
数字信号处理资源	156	70.91
时钟缓冲器	10	31.25
混合模式时钟管理器	2	50.00

Table 2 Root mean square error of direction finding results

来波角度/ (°)	载波频率/MHz
来波角度/ (°)	2330.0	2349.8	2585.0
3	0.23	0.24	0.23
15	0.33	0.32	0.33
23	0.71	0.69	0.75
-4	0.28	0.26	0.29
-16	0.49	0.46	0.50
-24	0.85	0.85	0.86

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