基于歐拉四面體的下降軌雷達(dá)圖像定位方法

冉聃; 鄧歡; 李亞超; 全英匯; 邢孟道

doi:10.11999/JEIT160512

基于歐拉四面體的下降軌雷達(dá)圖像定位方法

doi: 10.11999/JEIT160512

基金項(xiàng)目:

國(guó)家自然科學(xué)基金(61471283, 61303035)

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- 文章訪問(wèn)數(shù): 1333
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出版歷程
- 收稿日期: 2016-05-19
- 修回日期: 2016-09-30
- 刊出日期: 2017-03-19

Radar Image Positioning Method on Decent Trajectory Based on Euler Tetrahedron

Funds:

The National Natural Science Foundation of China (61471283, 61303035)

摘要

摘要: 導(dǎo)彈在末制導(dǎo)階段因慣導(dǎo)誤差導(dǎo)致彈體實(shí)際位置和慣導(dǎo)指示位置存在較大偏差，影響導(dǎo)引頭對(duì)目標(biāo)的準(zhǔn)確定位，無(wú)法滿足精確打擊的應(yīng)用需求。由于彈載合成孔徑雷達(dá)在導(dǎo)彈俯沖下降段特殊的成像幾何構(gòu)型，目標(biāo)點(diǎn)對(duì)應(yīng)斜視角所在的平面與成像平面異面，因而傳統(tǒng)的基于多普勒測(cè)角的定位方法已不再適用。該文利用圖像匹配獲取的高精度地面點(diǎn)相對(duì)位置信息和雷達(dá)到各目標(biāo)點(diǎn)的高精度斜距信息，通過(guò)構(gòu)建歐拉四面體幾何模型，以場(chǎng)景數(shù)字高程作為先驗(yàn)信息篩選參考點(diǎn)，解算出以目標(biāo)點(diǎn)為原點(diǎn)構(gòu)建的北天東坐標(biāo)系下的彈體實(shí)際位置，從而為彈體修偏提供準(zhǔn)確信息。仿真實(shí)驗(yàn)驗(yàn)證了該定位方法能很好地滿足導(dǎo)彈末制導(dǎo)階段的目標(biāo)定位需求。
- 聚束合成孔徑雷達(dá) /
- 圖像匹配 /
- 彈載下降段 /
- 定位
Abstract: There is a large deviation between the actual position of the missile and inertial guidance position in the final guidance stage due to the inertial navigation error, which influences seeker,s accurate on positioning to the target, so it can not meet the application needs of precision strike. Due to the special imaging geometry of the missile borne Synthetic Aperture Radar (SAR) in the descending section, the squint angle plane of the target point is different from the imaging plane, so the traditional positioning method based on Doppler angle measurement is no longer applicable. This paper uses image matching to obtain high precision ground point relative position information and the high precision slant range information between radar and target point. By constructing a Euler tetrahedral geometry model, using the scene digital elevation as a priori information to screen the reference point, the actual position of the missile in the established North-sky-East coordinate system with an origin of the target point is calculated. Then it can provide accurate information for the missile maintenance. Simulation results show that this method can meet the requirements of target positioning on missile terminal guidance stage well.
- Spotlight Synthetic Aperture Radar (SAR) /
- Image matching /
- Decent section of missile-borne /
- Positioning

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