双基地宽带成像雷达时间及调频率同步方法

doi:10.12305/j.issn.1001-506X.2024.04.07

Abstract

Abstract:

Bistatic wideband imaging radar generates time synchronization errors and chirp rate errors due to different sources. To address this issue, for low-cost and miniaturized radar receivers, synchronization methods are designed. To solve the time synchronization problem, the nonuniformity time synchronization scheme with transmitting and receiving pulse width triggered by direct wave is proposed, which is using direct-wave-to trigger receive window enable moments, while increasing the receive window length and low-pass matching filtering to complete the time synchronization. To solve the chirp rate synchronization problem, it is proposed to estimate the chirp rate frequency error using Lv's distribution, and to further compensate it to complete the chirp rate synchronization. The time and chirp synchronization method basically does not need to increase the receiver hardware cost and can be adapted to the miniaturized receiving radar ' s requirements. Based on the small wideband radar to build indoor bistatic wideband radar model, the experimental validation is conducted to realize the bistatic radar synchronization as well as data acquisition and imaging. The experimental results verify the effectiveness of the proposed method.

Key words: bistatic radar, time synchronization, chirp rate synchronization, wideband imaging radar

CLC Number:

TN957

Liang LI, Yang HUANG, Guanghu JIN, Zhen DONG, Feng HE, Mulan ZOU. Time and chirp rate synchronization method of bistatic wideband imaging radar[J]. Systems Engineering and Electronics, 2024, 46(4): 1193-1203.

Figures/Tables 17

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场景参数	取值
金属球直径D/m	0.1
收发雷达起始间距L/m	1.3
发射雷达与目标起始间距R_t/m	2.6
接收雷达与目标起始间距R_r/m	2.2
初始双基地角β_init/(°)	30
合成孔径长度L_a/m	0.192
最终双基地角β_final/(°)	26

雷达参数	接收雷达	发射雷达
起始频率f_ini/GHz	77	77
调频率S/(MHz/μs)	19.553	19.553
带宽B/MHz	2 002.23	-
采样点数	1 024	-
采样率f_s/MHz	10	-
滤波器截止频率f_cut/MHz	35	-

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Time and chirp rate synchronization method of bistatic wideband imaging radar

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