| 1. | The debris falling back to earth may generate additional direct and surface-wave noise .
碎石落回地面可产生附加的直达波和面波噪声。 |
| 2. | Discussion on calculation method of peak pressure subjected to shallow - layer water explosion
浅层水中爆炸直达波压力峰值计算方法探讨 |
| 3. | Basically , the cross - well seismic data processing has two steps : traveltime velocity inversion tomography for direct arrival and seismic reflection stack image
井间地震资料的处理主要包括两个最基本的内容，即直达波旅行时速度反演层析成像和地震反射波叠加成像。 |
| 4. | Meanwhile , three los ( linear of sight ) location algorithms are analyzed . these algorithms are simulated both on the los situation and nlos situation
同时还分析讨论了现有的几种直达波定位算法,并在直达波环境下和非直达波环境下对现有的基本直达波算法进行了仿真。 |
| 5. | The sirt inversion operator can be applied to solve the large - scale sparse linear equation and velocity tomographic inversion can be performed based on direct arrival traveltime and accuracy could be 3 meters
研究成功的sirt反演算法可用于求解大型稀疏超定线性方程组，根据直达波旅行时进行速度层析反演，其精度可达到3米。 |
| 6. | The precondition for processing cross - well seismic data is that to perform the original data analysis thoroughly and determine the various waveforms and wave field as well as using the effective way to boost the direct arrival and reflection and suppress the disturbances and other noises
处理井间地震资料的前提是全面详尽地分析原始资料，判别确认记录上的各种波型与波场，采取有效手段突出直达波和反射波等有效波，压制干扰波和噪音。 |
| 7. | Wireless localization and tracking is a hot research topic , several theorestic and applied results have been in recent years . this paper addressed two problems : 1 . how to mitigate position error caused by non - line - of - sight ( nlos ) propogation when we use range - based tracking algorithm in cellular networks
本文探讨了其中的两个问题: 1 .在跟踪蜂窝移动通信网络中移动终端的运动轨迹时,如何利用粒子滤波器减弱非直达波传播对滤波跟踪算法精度的显著影响 |
| 8. | The simulation results show : if there are three base stations , the performance of those los algorithms is similar . but the location error of the nlos situation is bigger than the los situation ’ s . therefore , new algorithm on the nlos situation is necessary to be developed
仿真结果表明:在三基站参与定位的情况下, 5种直达波定位算法性能相当,但其非直达波环境下的定位精度差于直达波环境下的定位精度,因此有必要提出新的算法提高非直达波环境下的定位精度。 |
| 9. | Present a modified particle filter ( pf ) algorithm based on the los / nlos binary state information of propagation environment using the numerical method of the probability density function ( pdf ) about the hybrid noise . the key idea is using numerical method to calculate the hybrid noise pdf , and integrating binary environment information to get filtering result
2 .给出了应用粒子滤波器改进直达波与非直达波混合环境中移动终端跟踪性能的新算法,特色是利用数值方法计算混合噪声密度函数,结合二元环境信息完成滤波估计。 |
| 10. | Based on the facts that time of arrival ( toa ) of the first multipath signal is always most close to that of los propagation and angle of arrival ( aoa ) of the first multipath signal is not always most close to that of los propagation among all multipath signals in nlos propagation environment , a location algorithm is proposed to mitigate the influence of nlos propagation , which effectively reduces the feasible region of a ms in macrocells
依据在非视距传播环境下存在的以下两个事实：第一，最先到达多径信号的波达时间总是最接近直达波的波达时间。第二，最先到达多径信号的波达方向并不一定最接近直达波方向。针对宏蜂窝系统，从有效减小移动台可行域的角度，提出了一种减轻非视距影响的定位算法。 |
