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Impact of oscillator noise in bistatic and multistatic SAR

机译:振荡器噪声对双基地和多基地SAR的影响

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This letter addresses the impact of limited oscillator stability in bistatic and multistatic synthetic aperture radars (SARs). Oscillator noise deserves special attention in distributed SAR systems since there is no cancellation of low-frequency phase errors as in a monostatic SAR, where the same oscillator signal is used for modulation and demodulation. It is shown that the uncompensated phase noise may cause a time-variant shift, spurious sidelobes, and a broadening of the impulse response, as well as a low-frequency phase modulation of the focused SAR signal. Quantitative estimates are derived analytically for each of these errors based on a system-theoretic model taking into account the second-order statistics of the oscillator phase noise.
机译:这封信解决了双静态和多静态合成孔径雷达(SAR)中有限的振荡器稳定性的影响。振荡器噪声在分布式SAR系统中值得特别关注,因为没有消除单相SAR中的低频相位误差的问题,在单站SAR中,相同的振荡器信号用于调制和解调。结果表明,未补偿的相位噪声可能会导致时变偏移,杂散旁瓣和脉冲响应变宽,以及聚焦SAR信号的低频相位调制。基于系统理论模型,考虑到振荡器相位噪声的二阶统计量,可以对这些误差中的每个误差进行定量估计。

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