基于5G SSB信号外辐射源雷达虚拟基线测向技术

doi:10.16180/j.cnki.issn1007-7820.2025.07.013

Abstract

Abstract:

In view of the phase ambiguity problem that occurs between the phases of 5G SSB(Synchronization Signal Block) during the target detection process of 5G external radiation source radar, this study proposes a virtual baseline direction finding technology for external radiation source radar based on 5G SSB signals. The correlation of the signal structure in the 5G communication signal SSB is utilized to confirm the SSB index, and the phase angle information is extracted at the corresponding SSB index positions. A phase unwrapping algorithm is adopted to reduce the phase ambiguity, and the target angle is obtained through the virtual baseline direction finding algorithm. A 5G toolkit is used to generate simulated signals for simulation analysis. The results show that the proposed method has a better direction finding effect compared with the traditional direction finding method. When the SNR(Signal-to-Noise Ratio) is -15 dB, the ambiguity resolution probability of the proposed method is 88.48%, and the RMSE(Root Mean Square Error) is 1.15°. The experimental results indicate that the proposed method can measure the target angle more accurately and has a better measurement accuracy than the traditional direction finding method.

Key words: external radiation source radar, 5G communication signal, synchronization signal block, autocorrelation, phase unwrapping, interferometer direction finding, virtual baseline direction finding, target detection

CLC Number:

TN953+.5

SONG Yu, TU Gangyi, ZHAO Di, SUN Zhuwei, CHEN Yan. Virtual Baseline Direction Finding Technology Based on 5G SSB Signal External Radiation Source Radar[J].Electronic Science and Technology, 2025, 38(7): 97-104.

Figures/Tables 15

Figure 1.

Table 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

Table 2.

Performance requirements for interferometers"

参数	指标
信号中心频率/MHz	2 524.95
无模糊测向范围	-90°~90°
系统相位测量误差 $Δ φ$	30°
K₁	2.0
K₂	2.5
K₃	5.0
最小虚拟天线间距 $D 1$ /mm	39.6
最小天线间距 $d 1$ /mm	296.8

Table 2.

Table 3.

Baseline length"

参数	数值/mm
$d 1$	296.8
$d 2$	336.4
$d 3$	415.6
D	1 048.8

Table 3.

Figure 8.

Figure 9.

Figure 10.

Figure 11.

Table 4.

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参数	指标
中心频率	2 524.95 MHz
通道带宽	40 MHz
子帧数量	120
子载波间隔	30 kHz
采样率	61.44 MHz

算法	RMSE误差/(°)
传统干涉仪测向	0.601 9
本文算法	0.240 9

Virtual Baseline Direction Finding Technology Based on 5G SSB Signal External Radiation Source Radar

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