机动平台俯冲大斜视SAR脉冲重复频率设计

doi:10.3969/j.issn.1001-506X.2020.03.010

Abstract

Abstract:

In diving highly squinted synthetic aperture radar (SAR) imaging, the traditional sequence design method of pulse repetition frequency (PRF) has the disadvantage that the lower limit value is too high to increase the data acquisition, and the PRF value cannot be adjusted in real time with the altitude of platform changing. In order to solve the above problems, a diving high squint imaging model mounted on the maneuvering platform is constructed firstly. Furthermore, the azimuth bandwidth calculation method based on equal-range rings is proposed to get the lower limit of PRF which takes motion and system error into consideration. Finally, the method of dynamic selection of PRF by dividing altitude segments is proposed, which can be adjusted dynamically according to the platform position. A few adjusting times of PRF value can realize the echo data acquisition in the beam coverage area, which solves the problem that PRF value cannot be adjusted in real time with the change of the altitude.

Key words: maneuvering platform, synthetic aperture radar (SAR), diving highly squinted, pulse repetition frequency (PRF), altitude segments

CLC Number:

10.3969/j.issn.1001-506X.2020.03.010

Yanfeng DANG, Yi LIANG, Gang ZHANG, Yujie LIANG, Yuhong ZHANG. Pulse repetition frequency design for diving highly squinted synthetic aperture radar mounted on maneuvering platform[J]. Systems Engineering and Electronics, 2020, 42(3): 575-581.

Figures/Tables 8

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References 29

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参数	数值
载频/ GHz	16
脉冲宽度/μs	10
距离带宽MHz	80
水平波束宽度/(°)	4.5
俯仰波束宽度/(°)	5
距离向幅宽/km	2.5
平台高度范围/km	[30, 25]
收发保护时间/μs	2

斜距/km	PRF/Hz
[36, 46)	6 000
[46, 55)	4 900
[55, 60)	7 000
[60, 71)	6 000
≥71	5 000

斜距/km	PRF/Hz
[32, 46)	6 000
[46, 52)	5 000
[52, 60)	7 000
[60, 71)	6 000
≥71	5 000

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Pulse repetition frequency design for diving highly squinted synthetic aperture radar mounted on maneuvering platform

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