一種大轉(zhuǎn)角ISAR兩維自聚焦平動(dòng)補(bǔ)償方法
doi: 10.11999/JEIT170303 cstr: 32379.14.JEIT170303
基金項(xiàng)目:
國(guó)家自然科學(xué)基金重大研究計(jì)劃培育項(xiàng)目(91438106)，國(guó)家自然科學(xué)基金創(chuàng)新群體(61621005)
A Two Dimensional Autofocus Translation Compensation Method for Wide-angle ISAR Imaging
Funds:
The Major Research Plan of the National Natural Science Foundation of China (91438106), The Foundation for Innovative Research Groups of the National Natural Science Foundation of China (61621005)
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摘要: 針對(duì)ISAR目標(biāo)在大轉(zhuǎn)角情況下轉(zhuǎn)動(dòng)和平動(dòng)分量耦合在一起，難以對(duì)平動(dòng)分量精確補(bǔ)償?shù)膯?wèn)題，該文提出一種大轉(zhuǎn)角ISAR兩維自聚焦平動(dòng)補(bǔ)償方法。首先對(duì)平動(dòng)粗補(bǔ)償，再通過(guò)極坐標(biāo)格式算法(PFA)對(duì)轉(zhuǎn)動(dòng)和平動(dòng)2維解耦，最后利用自聚焦算法提取誤差相位，從中估計(jì)剩余平動(dòng)并補(bǔ)償。所提方法可以同時(shí)校正由平動(dòng)引起的包絡(luò)誤差和相位誤差，且相比于傳統(tǒng)的包絡(luò)對(duì)齊級(jí)聯(lián)自聚焦的平動(dòng)補(bǔ)償方法精度更高，相比于包絡(luò)相位聯(lián)合優(yōu)化求解方法效率更高。仿真數(shù)據(jù)和暗室實(shí)測(cè)數(shù)據(jù)的實(shí)驗(yàn)結(jié)果證了所提方法的有效性與實(shí)用性。
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關(guān)鍵詞:
- ISAR /
- 大轉(zhuǎn)角 /
- 兩維自聚焦 /
- 平動(dòng)補(bǔ)償 /
- 高精度 /
- 高效
Abstract: For non-cooperative ISAR targets, the rotation motion and the translation motion are coupled under wide-angle circumstance, and it is hard to compensate the translation motion precisely. A two dimensional autofocus translation compensation method for wide-angle ISAR imaging is proposed. Firstly, the translation motion is compensated coarsely; then, two dimensional coupling between rotation and translation is decoupled through Polar Format Algorithm (PFA); finally, the error phase is extracted by autofocus algorithm and then the residual translation is estimated from the error phase. The proposed method can correct the envelope and phase errors simultaneously, and compared with traditional translation compensation methods, range alignment combining with autofocus, the proposed method has a higher precision; compared with the methods of optimization for jointing alignment and phase, the proposed method is more efficient. The experimental results using both simulated data and measured data collected in microwave chamber confirm the validation and practicality of the proposed algorithm. -
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