寬帶數(shù)字陣列雷達關(guān)鍵技術(shù)研究
[Abstract]:With the development of array radar technology and digital technology, digital array radar, especially narrow band digital array radar, has been developed and widely used. As the further development of narrowband digital array radar, wideband digital array radar integrates the advantages of active phased array radar, digital radar and wideband radar, which is the latest achievement and inevitable trend of radar development. Based on an experimental system of wideband digital array radar, this dissertation focuses on the development of wideband digital array radar, system structure, time domain wideband digital beamforming technology, subarray level wideband digital beamforming technology. Coherent wideband array signal processing technology based on coherent signal subspace method. The main contents are divided into four parts: the first part mainly introduces the development history and latest development of broadband digital array radar system and its related technologies at home and abroad. In this paper, the system structure and sub-system features of all-digital wideband digital array radar are studied, and some key technologies are briefly analyzed. In the second part, two kinds of time domain wideband digital beamforming methods are studied. Wideband digital array radar beamforming needs to consider aperture crossing effect. In this paper, the signal processing flow and processing error of wideband digital array radar beamforming in time domain are analyzed. The time domain wideband digital beamforming method based on if or RF integer delay and baseband fractional delay is studied. The effects of three commonly used fractional delay filter design algorithms and channel mismatch on the performance of time domain wideband digital beamforming are studied. In the third part, the time domain wideband digital beamforming method based on subarray level precise digital delay is studied, and the influence of different subarray partitioning of uniform linear array on beamforming is studied. In the fourth part, the DOA estimation of coherent wideband array signals based on coherent signal subspace method is studied. Because the traditional focusing algorithms almost all need to estimate or assume the signal angle in advance to construct the signal subspace, the prediction error or the hypothetical error will inevitably produce the uncontrollable focusing error. The result of the final signal angle estimation is deviated. In this paper, by constructing a signal subspace and a reference focusing matrix independent of the signal angle, a new subspace algorithm for the coherent signal subspace in the process of focusing without the prior information of the signal angle is proposed. Theoretical analysis and computer simulation show that compared with the traditional coherent signal subspace algorithm, the proposed algorithm has the advantages of not requiring prior signal angle information, computing complexity and signal angle estimation performance, and so on.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TN958
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