一種提高海洋SAR定位精度的方法
A Means of Improving Accuracy of Positioing for Ocean SAR
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摘要: 在無參考點(diǎn)海洋SAR定位方法中,多普勒中心頻率估計(jì)對(duì)定位精度有著重要的影響.該文從理論和仿真兩個(gè)角度研究了信噪比對(duì)多普勒中心頻率估計(jì)的影響,給出了多普勒中心頻率和信噪比的理論及仿真關(guān)系曲線.在此基礎(chǔ)上針對(duì)海洋回波信號(hào)較弱的特點(diǎn),在海洋SAR系統(tǒng)設(shè)計(jì)中增加一個(gè)多普勒測(cè)量模式.和普通成像模式相比,該模式通過降低帶寬的方式來提高回波的信噪比,從而提高了定位精度.
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關(guān)鍵詞:
- 海洋SAR定位; 多普勒中心頻率估計(jì); 信噪比
Abstract: Estimation of Doppler central frequency has an important effect to accuracy of fixed position in the fixing approach with no reference points for ocean SAR. The effect of Signal-Noise-Ration （SNR） to the estimation of Doppler central frequency has been studied using theoretical method and simulation technique, and results are given in curves. Based on above results, a Doppler measurement mode is adopted in the design of ocean SAR. Compared to common imaging mode, this mode increases SNR of ocean echo by decreasing the bandwidth, then accuracy of fixed position can be improved. -
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