复杂环境分布式相参雷达无线频率同步方法

doi:10.12305/j.issn.1001-506X.2025.12.09

Abstract

Abstract:

To avoid the influence of multipath and noise on the wireless synchronization link of the distributed coherent aperture radar system in complex environments, and to reduce the frequency deviation measurement error to achieve high-performance frequency synchronization between nodes, a master-slave frequency deviation measurement architecture is proposed. By transmitting specific waveform signals from the master node and receiving them at the slave node, the frequency deviation between nodes can be measured. Linear frequency-modulated periodic pulse signals is used as the synchronization waveform, fully utilizing the waveform’s characteristics of noise suppression and multipath signal separation after correlation processing. A two-dimensional coherent method is adopted to calculate the frequency deviation, achieving system frequency synchronization. The performance limits of the proposed method for frequency synchronization is derived and the relationship between the synchronization waveform parameters is quantified. Simulation results show that the proposed method can achieve the theoretical limit of frequency synchronization performance under the noise-only conditions. Compared with the frequency synchronization methods in orthogonal frequency division multiplexing communication systems, the proposed method performs better in complex environments.

Key words: distributed coherent aperture radar (DCAR), wireless frequency synchronization, frequency deviation measurement, wireless synchronous link

CLC Number:

TN 952

Nan WANG, Yongjiang LUO, Jiali YANG, Yuhang BAI. Wireless frequency synchronization method for distributed coherent aperture radar in complex environments[J]. Systems Engineering and Electronics, 2025, 47(12): 4078-4083.

Figures/Tables 7

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References 30

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参数	说明
测量节点相对频率偏差η	−4×10⁻⁸
射频工作频点/GHz	10
节点间距/m	150
信号形式	线性调频脉冲信号
信号脉宽τ/μs	5
脉冲信号带宽B/MHz	8
脉冲重复周期PRT/μs	50
采样率/MHz	20
脉冲数N	128
信噪比/dB	−20~30
OFDM传输符号	4-相移键控调制
OFDM子载波数	52
OFDM的FFT长度	64
OFDM循环前缀	16
OFDM导频间隔	6

多径类型	信号参数	说明
α型长时延多径	数量	10
	幅度	0.1~0.3 （均匀分布）
	时延（＞1/B）/μs	1.3~2.3 （均匀分布）
β型短时延快变化多径	数量	10
	幅度	0.1~0.3 （均匀分布）
	时延（＜1/B）/μs	0~1.25 （均匀分布）
	相位	0~2π （均匀分布）
γ型短时延慢变化多径	数量	10
	幅度	0.1~0.3 （均匀分布）
	时延（＜1/B）/μs	0~1.25 （均匀分布）
	相位	0

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[5]	. Geometric arrangement constraints of distributed coherent aperture radar [J]. Systems Engineering and Electronics, 2017, 39(8): 1723-1731.

Wireless frequency synchronization method for distributed coherent aperture radar in complex environments

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