cross-range造句
例句与造句
- Second , it introduces an additive phase component which induces defocus in cross - range
二是引入了附加的相位分量，在方位向造成散焦。 - So the match - filter function may be constituted to realize the cross - range compress
根据其调频斜率,构造方位向匹配滤波函数可实现方位向匹配压缩。 - Therefore , the compensation in range and cross - range towards the complex movement becomes a crucial step of isar imaging
对于目标的运动补偿是isar成像中的关键技术。 - The united signal for the isar signal processing is called the cross - range dimension signal . the cross - range dimension signal of the target with nearly tangent motion is a linear frequency modulated signal
由推导的准切向运动目标的方位向信号的相位表示式可以看出,此信号近似为线性调频信号。 - Isar transmits wide bandwidth signals to obtain high range resolution . the cross - range resolution is obtained by the doppler frequency information of the target ’ s rotation
逆合成孔径雷达通过发射大带宽信号获得好的距离分辨率,利用目标相对于雷达的转动产生多普勒频率梯度来获取好的方位向分辨力。 - It's difficult to find cross-range in a sentence. 用cross-range造句挺难的
- The former does not contribute to the imaging and is harmful . it influences isar imaging in two aspects : first , it causes the range misalignment of the range profiles which makes the processing in cross - range impossible
它对isar成像的影响有两个方面：一是使相邻的一维距离像在距离向错开，无法进行方位向分辨。 - They mainly work hard at softwares to accomplish special processing systems . the imaging quality has become better and better and now the range and cross - range resolution can be very high
系统设计者纷纷采用数字信号处理技术，在软件上多下功夫，做出专用处理设备，成像质量不断提高，其距离和方位向已达到了很高的分辨力。 - Because of the limited cross - range resolution , high frequency ( hf ) over - the - horizon ( oth ) radar has the poor ability to determine the number of group targets and identify the large warship such as aircraft carrier in engineering applications
我国的高频雷达已进入工程化应用阶段,但由于受分辨能力的限制,在群组目标的个数分辨及大型船只的识别等方面仍有不足之处。 - To improve this ability , a higher cross - range resolution is needed . an inverse synthetic aperture radar ( isar ) achieves high resolution in the cross - range dimension by taking advantage of the motion between radar and targets to synthesize the effect of a larger antenna aperture
逆合成孔径雷达( inversesyntheticapertureradar ,简称isar )信号处理对接收到的运动目标的回波信号进行相干处理,等价成一个大口径天线,很大程度上提高了方位向距离分辨力。 - Due to the short distance among the planes which fly in a group , the conventional low resolution radar can not distinguish them in both distance and azimuth ? if we use the technology of isar to resolve the difference among doppler frequency of the targets and obtain a fine resolution cross - cross image , we may separate them , but a long time of coherent processing is needed < , for the formation targets , it can be approximately divided to rigid body and nonrigid body , so for the formation targets , that can be regarded as rigid which has a relative position and an identical movement , can be approximately considered as a large target , and be compensated by translational phase with the rule of minimum entropy , but for the most those cannot accord with the approximation of rigid , being the doppler - frequency of the aim is linear changed , by the relax method with short data , increases the resolving performance of multiple target to the aim in the frequency domain , since cross - range resolution is based on the accumulative time , so it is greatly improve the resolution to formation targets by the instant cross - range image which produced by radon - wigner transformation
低分辨isan成像及干涉技术应用研究一因此直接无法分辨编队目标的架数，我们借鉴isar的技术，通过较长时间的相干积累，在多普勒频域上对目标进行分辨。而对于编队目标，可分为近似刚性的多目标和非刚性的多目标，所以对于可以近似为刚体的编队目标相对位置固定，运动方式一致，可以近似看作一个大目标，采用最小墒准则对平动相位的进行补偿，但是大多数并不满足刚体近似的编队目标，由于目标在相干积累时间的多普勒频率近似呈线性变化，通过对较短数据利用relax的时频分析方法，提高了频率域上目标分辨的性能。由于横向分辨率取块于横向积累时间，所以利用radnwigner变换得到瞬时的一维横向距离像大大提高了对编队目标的分辨，对仿真和实测数据的大量分析结果表明此方法的有效性和可行。 - After the compensation based on the rule of the minimum entropy , the resolution of the cross - range image is lower as the large size and non - uniform rotation , which cause the image to be not right at all sometimes . in order to eliminate effect of the non - stationary rotation , the first order approximation and relax algorithm are adopted to search the initial frequency , amplitude , frequency modulation rate and obtain the dynamic image of the target at any time
分析了低分辩雷达的成像算法，建立在最小熵补偿基础上的算法得到的横向像的分辨率仍然比较低，尤其对大的目标和机动目标，为此我们采取了一阶近似的relax算法搜索目标的初始频率、幅度、解调率从而获得目标的动态一维像，仿真数据和试验结果证明该方法是有效的。