| 1. | Doppler centroid estimation of sas based on radon transform
变换的合成孔径声纳多普勒中心估计 |
| 2. | A study on synthetic aperture sonar movement compensation based on displaced phase center algorithm
基于位移相位中心算法的合成孔径声纳运动补偿研究 |
| 3. | As a detecting device working underwater , the synthesize aperture sonar is fixed in the underwater carrier
作为水下探测器的一种，该系统的水下探测部分载体内承装的是合成孔径声纳系统。 |
| 4. | The towed synthesize aperture sonar system will become an important weapon of our army in antisubmarine and antimine war and be applied widely
拖曳式合成孔径声纳系统将成为我军反潜、反水雷的重要武器，具有广泛的应用前景。 |
| 5. | Because of the unstability of platform and the complexity of the propagation characteristics of sound in ocean , the motion compensation problem of the sas is more serious than sar . the thesis studies deeply the motion compensation problem of sas based on echoes data
Sas基阵平台的不稳定性以及水声信道的复杂性使得其运动补偿问题较sar更为突出，论文对基于回波信号的合成孔径声纳运动补偿方法进行了较深入的研究。 |
| 6. | Interferometric synthetic aperture sonar ( insas ) provides a means of obtaining 3 - dimensional images of scene . three - dimensional information is derived from the phase difference between two ( or several ) complex images of sas taken from separate receiving array across the track
干涉合成孔径声纳( insas )是在合成孔径声纳( sas )基础上垂直航迹方向增加一副(或多副)接收基阵，通过比相测高的方法得到场景的高度信息，从而得到场景的三维图象。 |
| 7. | Aperture synthesis sonar , as its name implies , synthesizes an aperture by storing successive echoes obtained from a moving platform and by processing the results as if they had been obtained from a multi - element array enables a high azimuth resolution to be obtained from a physically small array
合成孔径声纳，顾名思义就是通过小孔径物理声阵的匀速直线运动，将沿航迹方向的回波数据相干累加，形成较大的虚拟孔径，从而提高方位分辨率。合成孔径技术相对于常规声纳技术的突出优势在于，它只利用小孔径的物理声阵，就可以得到与径向距离和频率都无关的高方位分辨率。 |
| 8. | The thesis involves all - aspect of the signal processing of interferometric synthetic aperture sonar , especially in the challenging problems such as phase - preserved sas imaging algorithm , image registration , interferogram denoising filtering and two - dimensional phase unwrapping . in allusion to difficulties and emphases , some new methods are proposed . the study is important to prompt the development of interferometric synthetic aperture sonar in china
本论文对干涉合成孔径声纳信号处理过程进行了全面的论述，对其中的关键技术如保相的二维成像算法、复图像配准、干涉图降噪滤波和二维相位展开作了重点分析，并提出了一些新的方法，论文对推动我国干涉合成孔径声纳信号处理技术的研究具有重要的意义。 |
| 9. | At the same time , the " stop - hop - stop " approximation is no longer valid in sas due to the low speed of sound . the receiver has unavoidable movement , when echoes get to receiver from different distances . in order to overcome the problem , an image forming algorithm of multi - aperture sas is presented in the thesis , which is suitable for the case of non - " stop - hop - stop "
为了解决测距、测速模糊问题， sas通常采用多子阵技术，而且由于sas “停?走?停”假设往往不再有效，即测绘带内不同距离回波到达基阵时，基阵存在不可忽略的运动，所以论文提出了一种“停?走?停”假设不成立条件下的多子阵合成孔径声纳逐点成像算法以得到相位保真度更高的复图像。 |
