Underwater Acoustic Image Transmission System Based on DSP

The underwater acoustic image transmission system based on the high-speed DSP device TMS320C549 has been studied.We use Goertzel algorithm for source decoding and MFSK for modulation.Turbo code is used for channel coding and decoding.The purpose is to implement underwater video image data transmission.     

灾害性海冰航空遥感监测实时传输系统

本文介绍应用遥感技术，电子技术，计算机技术，无线通信技术为一体的综合研究，实现了海洋航空遥感监测数据实时传输系统，文中对该系统的总体设计，系统组成，工作原理，遥感信息的采集处理，数据通信，地面数据接收及试验结果作了详细的说明。     

海洋硬骨鱼类卵黄囊期生物能学研究

卵黄囊期是鱼类早期发育中的一个重要阶段，是鱼类由内源营养向外源营养转化的一个关键时期。在此期间，游离氨基酸、蛋白质、脂肪酸、总脂和碳水化合物等基本生化成份的变化表现出一定的规律性，并具有种的特异性。从能量学的角度来分析，则表现为主要能源物质在发育过程中有规律的变化，各能量物质是按一定顺序被利用的。 鱼卵是一个高度特化的自组织系统，它在发育过程中，用于细胞活动的物质基础主要是卵黄。在卵黄期，卵细胞的代谢过程可描述为依生化成份变化的生化代谢过程和依能量转移和释放的能量代谢过程。从受精到卵黄囊消耗完全的卵黄囊期，以开口摄食为标志分为前后两个阶段，开口之前为全部利用自身营养的内源营养阶段，开口之后为利用自身营养和外源营养相结合的混合营养阶段。探素卵黄囊期海洋硬骨鱼类的能量转化规律，定量分析发育过程中生化成分和能量物质的变化，预测维持仔稚鱼生命活动和提供生长所必需的合适饵料营养成分，已成为鱼类早期发育生物学研究的热点课题。     

油轮系泊墩式码头时撞击能量的概率分布研究

利用某煤油轮系泊墩式码头靠泊力整体模型试验的资料，分析油轮系泊码头时，在不规则波作用下总撞击能量的分布。计算表明，在不规则波作用下，无因次总撞击能量的概率分布符合ＰⅢ型分布曲线。     

A Numerical Model for Natural Backfill of Pipeline Trenches Subjected to Unidirectional／Oscillatory Flows

A numerical model for the self-burial of a pipeline trench is developed. Morphological evolutions of a pipeline trench under steady-current or oscillatory-flow conditions are simulated with/without a pipeline inside the trench. The oscillatory flow in this study represents the action of waves. The two-dimensional Reynolds-averaged continuity and Navier-Stokes equations with the standard k-e turbulence closure, as well as the sediment transport equations, are solved with the finite difference method in a eurvilirrear coordinate system. Both bed and suspended loads of sediment transport are included in the morphological model. Because of the lack of experimental data on the backfilling of pipeline trenches, the numericalmodel is firstly verified against three closely-relevant experiments available in literature. A detailed measurement of the channel migration phenomenon under steady currents is employed for the assessment of the integral performance of themodel. The two experimental results from U-tube tests are used to validate the model‘s ability in predicting oscillatory flows. Different time-marching schemes are employed for the morphological computation under unidirectional and oscillatory conditions. It is found that vortex motions within the trench play an important role in the trench development.     

能量分析在台风短期预报业务中的应用

本文以９４１４、９４１５号两个连续北上台风为例，证明能量场的分布与台风移向有着明显的对应关系。     

Effect of Multipoint Heterogeneity on Nonlinear Transformations for Geological Modeling： Porosity-Permeability Relations Revisited

An analysis of statistical expected values for transformations is performed in this study to quantify the effect of heterogeneity on spatial geological modeling and evaluations. Algebraic transformations are frequently applied to data from logging to allow for the modeling of geological properties. Transformations may be powers, products, and exponential operations which are commonly used in well-known relations (e.g., porosity-permeability transforms). The results of this study show that correct computations must account for residual transformation terms which arise due to lack of independence among heterogeneous geological properties. In the case of an exponential porosity-permeability transform, the values may be positive. This proves that a simple exponential model back-transformed from linear regression underestimates permeability. In the case of transformations involving two or more properties, residual terms may represent the contribution of heterogeneous components which occur when properties vary together, regardless of a pair-wise linear independence. A consequence of power- and product-transform models is that regression equationswithin those transformations need corrections via residual cumulants. A generalization of this result isthat transformations of multivariate spatial attributes require multiple-point random variable relations. This analysis provides practical solutions leading to a methodology for nonlinear modeling using correct back transformations in geology.     

基于卫星短消息通信的大地测量信息传输技术

无线通信是大地测量内外业一体化生产中的瓶颈问题。首先介绍了大地测量信息传输系统的基本功能,给出了通信管理功能的基本结构,然后重点讨论了通信管理中的一些关键技术:用户终端与计算机控制程序之间的信息组织、利用CRC校验和多重确认进行误码控制、建立传输队列来防止信号失锁造成的信息拥塞。最后通过试验分析,验证了利用卫星短消息通信进行大地测量信息传输的可行性。     

FPAR的Monte Carlo模拟研究

FPAR (fraction of photosynthetically active radiation absorbed by the canopy)是植被冠层阻截太阳光合有效辐射的比例,是遥感估算陆地生态系统植被净第一性生产力(NPP)的重要参数.利用Monte Carlo方法模拟光子在植被冠层中的辐射传输过程,以植被冠层二向反射分布函数的模拟来验证模拟的正确性;在此基础上对400-700nm光合作用波段范围内的植被叶片吸收光子辐射比例的FPAR进行模拟.FPAR的Monte Carlo模拟结果,揭示了FPAR与太阳天顶角及植被冠层参数之间的关系.     

基于小波变换的全色和多光谱遥感图像融合

基于多分辨率小波变换,针对高分辨率全色图像和多光谱图像的融合,提出了一种基于方向可调滤波器的区域能量测量的小波变换融合算法.将此方法与HIS和传统小波的融合方法比较,结果表明,该方法在保留多光谱图像光谱信息的同时,能够更好地保留高分辨率图像的空间信息,融合效果有较大改善.