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Description: 硕士学位论文捷联惯性系统初始对准研究
惯导系统的初始对准是影响系统使用性能的关键技术之一，对准的精度与速度直接关系到惯性统的精度与启动特性。对卡尔曼滤波及其在初始对准中的应用进行了研究。首先介绍了卡尔曼滤波理论的应用背景，然后推导了离散卡尔曼滤波方程，并对连续系统的状态方程进行离散化提出了适用于舰载捷联惯性系统的动基座对准的2通道10个状态变量和2通道12个状态变量的系统动态模型，并建了相应的速度匹配和位置匹配量测模型。
-master's degree thesis SINS initial alignment study INS initial alignment is affecting system performance one of the key technologies, the alignment precision and speed is directly related to the precision inertial reunification with the startup characteristics. The Kalman filter and the initial alignment of the study. First introduced the theory of Kalman filtering background, and then reasoned a discrete Kalman filter equations, also for the state of discrete equations apply to the carrier SINS System Moving Base Alignment of two channels 10 state variables and two 12-channel system state variables dynamic model and built a corresponding speed matching and position matching measurement model.
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Size: 8600889 |
Author: 王琴 |
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Description: Carrier-phase synchronization can be approached in a
general manner by estimating the multiplicative distortion (MD) to which
a baseband received signal in an RF or coherent optical transmission
system is subjected. This paper presents a unified modeling and
estimation of the MD in finite-alphabet digital communication systems. A
simple form of MD is the camer phase exp GO) which has to be estimated
and compensated for in a coherent receiver. A more general case with
fading must, however, allow for amplitude as well as phase variations of
the MD.
We assume a state-variable model for the MD and generally obtain a
nonlinear estimation problem with additional randomly-varying system
parameters such as received signal power, frequency offset, and Doppler
spread. An extended Kalman filter is then applied as a near-optimal
solution to the adaptive MD and channel parameter estimation problem.
Examples are given to show the use and some advantages of this scheme.
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Size: 827601 |
Author: 吴大亨 |
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Description: 硕士学位论文捷联惯性系统初始对准研究
惯导系统的初始对准是影响系统使用性能的关键技术之一，对准的精度与速度直接关系到惯性统的精度与启动特性。对卡尔曼滤波及其在初始对准中的应用进行了研究。首先介绍了卡尔曼滤波理论的应用背景，然后推导了离散卡尔曼滤波方程，并对连续系统的状态方程进行离散化提出了适用于舰载捷联惯性系统的动基座对准的2通道10个状态变量和2通道12个状态变量的系统动态模型，并建了相应的速度匹配和位置匹配量测模型。
-master's degree thesis SINS initial alignment study INS initial alignment is affecting system performance one of the key technologies, the alignment precision and speed is directly related to the precision inertial reunification with the startup characteristics. The Kalman filter and the initial alignment of the study. First introduced the theory of Kalman filtering background, and then reasoned a discrete Kalman filter equations, also for the state of discrete equations apply to the carrier SINS System Moving Base Alignment of two channels 10 state variables and two 12-channel system state variables dynamic model and built a corresponding speed matching and position matching measurement model.
Platform: |
Size: 8600576 |
Author: 王琴 |
Hits:
Description: Carrier-phase synchronization can be approached in a
general manner by estimating the multiplicative distortion (MD) to which
a baseband received signal in an RF or coherent optical transmission
system is subjected. This paper presents a unified modeling and
estimation of the MD in finite-alphabet digital communication systems. A
simple form of MD is the camer phase exp GO) which has to be estimated
and compensated for in a coherent receiver. A more general case with
fading must, however, allow for amplitude as well as phase variations of
the MD.
We assume a state-variable model for the MD and generally obtain a
nonlinear estimation problem with additional randomly-varying system
parameters such as received signal power, frequency offset, and Doppler
spread. An extended Kalman filter is then applied as a near-optimal
solution to the adaptive MD and channel parameter estimation problem.
Examples are given to show the use and some advantages of this scheme.
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Size: 827392 |
Author: 吴大亨 |
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Description: GPS信号的基带处理在IEEE发表的文章有关信号捕获和跟踪的-GPS baseband signal in the IEEE published articles related to signal acquisition and tracking of
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Size: 103424 |
Author: 刘旭东 |
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Description: INTER-CARRIER INTERFERENCE CANCELLATION FOR OFDM SYSTEMS:
Orthogonal Frequency Division Multiplexing (OFDM) is an emerging multi-carrier modulation scheme, which has been adopted for several wireless standards such as IEEE 802.11a and HiperLAN2. A well-known problem of OFDM is its sensitivity to frequency offset between the transmitted and received carrier frequencies. This frequency offset introduces inter-carrier interference (ICI) in the OFDM symbol. This project investigates three methods for combating the effects of ICI: ICI self-cancellation (SC), maximum likelihood (ML) estimation, and extended Kalman filter (EKF) method. These three methods are compared in terms of bit error rate performance, bandwidth efficiency, and computational complexity. Through simulations, it is shown that the three techniques are effective in mitigating the effects of ICI. For high values of the frequency offset and for higher order modulation schemes, the ML and EKF methods perform better than the SC method.
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Size: 390144 |
Author: redami |
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Description: 通过此卡尔曼滤波，可获得比较精准的载体位置，速度，加速度等信息。-Through the kalman filter, can get a more accurate carrier position, velocity, acceleration and other information.
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Size: 1024 |
Author: xue |
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Description: 星间精密测距是导航星座实现自主导航的核心技术。针对导航星座中码测量值精度低但无整周模糊度，载
波相位测量值精度高但存在整周模糊度的特点，该文根据贝叶斯递推原理提出了一种衰减记忆高斯和滤波(Fading
Memory Gaussian Sum Filter,FMGSF)的伪距估计方法。该方法用高斯和形式近似表示系统后验概率密度，并根
据卡尔曼滤波原理来更新高斯项的均值和方差，同时引入衰减记忆因子克服由于模型失配导致的滤波结果发散问
题，利用重采样解决由于载波相位测量值不确定导致的算法复杂度增加问题。理论分析和仿真结果表明，该文提出
的方法不仅能够克服周跳对伪距估计的影响，而且可以获得更好的测距精度。
-Precise ranging is the core technology of autonomous navigation.For code measurements yield noisy but
unambiguous pseudorange estimates and the pseudorange obtained with carrier phase measurements are almost
noiseless but are affected by integer ambiguity,a Fading Memory Gaussian Sum Filter(FMGSF)algorithm based
on Bayesian recursive relations is proposed.Posteriori probability density is approximated as a finite Gaussian
mixture,the means and variances of Gaussian terms are updated according to the principle of Kalman filter.
Fading memory factor is imported to avoid the issue of filter divergence due to mismodeling and resampling is
performed to resolve the issue of increasing in computational complexity caused by carrier phase measurement
uncertainty.Theoretical analysis and simulation results show that this algorithm can overcome the effect of cycle
slips to a certain extent and achieve higher range accuracy.
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Size: 1083392 |
Author: wangmingxiao |
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Description: 态导航与定位的质量取决于对动态载体扰动和观测异常扰动的认知和控制。首先介绍机动载体的
当前统计模型，分析该模型存在的问题，提出一种基于“当前”加速度模型的抗差自适应卡尔曼滤波算法。跟以
往建立的自适应Kalman滤波进行比较，计算结果表明，该算法不仅可以提高滤波器的精度，而且更能有效地控
制观测异常和动态扰动异常对导航解的影响，使导航解更能反映导航系统的真实情况。-The quality of the state of navigation and positioning depends on the awareness and control of dynamic vector perturbations and observing abnormal disturbances. First introduced motor carrier current statistical model to analyze the problems of the model proposed a current acceleration model Robust adaptive Kalman filter algorithm. Comparison with the previously established adaptive Kalman filtering, and calculation results show that the algorithm can not only improve the accuracy of the filter, and control the observational anomalies and dynamic disturbances exception navigation solution more effectively, make navigation solution to better reflect the navigation the real situation of the system.
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Size: 391168 |
Author: 长沙 |
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Description: 运动载体的定位与导航一般应用Kalman滤波算法。可
靠的Kalman滤波算法要求有可靠的函数模型、随机模型以
及合理的估计方法。实际情况中运动载体一般难以确保规
则运动，因而精确的函数模型的构造十分困难。近年来，
有不少学者对机动载体运动模型进行了讨论，所属内容各
具特点，建立的各种模型包括微分多项式模型、常速度模
型、常加速度模型、时间相关模型，半马尔柯夫模型、
Noval统计模型及机动载体的“当前”统计模型-Moving vehicle positioning and navigation general application of the Kalman filter algorithm. Kalman filter algorithm requires a reliable function model, a stochastic model, as well as a reasonable estimation method. Moving carrier in the actual situation is generally difficult to ensure a regular motion, and thus the the precise function model structure is very difficult. In recent years, many scholars have discussed the movement of the motor carrier model, each with distinct characteristics of their respective content, establish various models including the differential polynomial model, constant velocity model, constant acceleration model, time-dependent model, semi-Markov model, Noval statistical model and motor carrier " current" statistical model
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Size: 267264 |
Author: 长沙 |
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Description: 系统方程维数为10,卡尔曼滤波以及根据轨迹发生器生成的理想轨迹数据计算载体的参数-System Fang Chengwei number of 10, Kalman filtering, and based on the ideal trajectory generator generates a parameter trajectory data carrier
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Size: 3072 |
Author: 杨丫 |
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Description: 很好的GPS/INS超紧组合导航的文章，关键词：GPS,INS，超紧组合导航，抗干扰-The performance of an Ultra-Tightly Coupled
(UTC) Global Positioning System/Inertial Navigation System
(GPS/INS) is evaluated using a system simulation of the GPS
receiver and navigation processing. The UTC system being
analyzed uses a bank of pre-filters to estimate code delay error
and Doppler frequency error for each satellite. These outputs are
sent to a central Kalman navigation filter. This central processor
generates estimates of inertial navigation position, velocity, and
attitude errors IMU biases and user clock errors, which are
used to correct the navigation solution. In the UTC approach,
outputs from the central navigation processor, after projection
into satellite line-of-sight coordinates, are used to control the
code and carrier replica signals for each satellite channel. In
contrast, a conventional tightly coupled GPS/INS system uses
separate tracking loops for each satellite channel, which operate
autonomously. As a result, the UTC desig
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Size: 461824 |
Author: lili |
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Description: matlab编程设计GPS中载波跟踪环路kalman滤波器的应用-matlab programmed the GPS carrier tracking loop kalman filter application
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Size: 2048 |
Author: guo |
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Description: In a rapidly fading environment in high data rate wireless communication systems the orthogonality of OFDM sub carrier signals destroyed and this phenomenon potentially results in Inter carrier interference (ICI).The novel contribution of the paper is that, the effects of ICI have been analyzed and solutions to ICI diminution have been presented in different frequency offset values such as 0.5,0.15 and 0.30 . The first method is a self-cancellation scheme, in which redundant data is transmitted onto adjacent subcarriers such that the ICI between adjacent sub carriers cancels out at the receiver. The other technique the Extended Kalman Filter (EKF) method statistically estimate the frequency offset and correct the offset using the estimated value at the receiver-In a rapidly fading environment in high data rate wireless communication systems the orthogonality of OFDM sub carrier signals destroyed and this phenomenon potentially results in Inter carrier interference (ICI).The novel contribution of the paper is that, the effects of ICI have been analyzed and solutions to ICI diminution have been presented in different frequency offset values such as 0.5,0.15 and 0.30 . The first method is a self-cancellation scheme, in which redundant data is transmitted onto adjacent subcarriers such that the ICI between adjacent sub carriers cancels out at the receiver. The other technique the Extended Kalman Filter (EKF) method statistically estimate the frequency offset and correct the offset using the estimated value at the receiver
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Size: 211968 |
Author: Fardeen |
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Description: 载机侧向交叉定位时，应用修正增益的扩展卡尔曼滤波程序进行定位的c程序-When the carrier aircraft side cross location, using the modified gain extended Kalman filter positioning program c program
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Size: 230400 |
Author: 梁云 |
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Description: 载机跟踪高速高机动目标时，使用交互式多模型算法，该算法中又用平方根容积卡尔曼滤波器进行滤波。-When the carrier aircraft tracking high-speed maneuvering targets, using interactive multiple model algorithm in the Kalman filter is also used to filter the square root of the volume.
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Size: 5120 |
Author: 梁云 |
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Description: 抑制载波型差分相位调制，BP神经网络的整个训练过程,各种kalman滤波器的设计。- Suppressed carrier type differential phase modulation, The entire training process BP neural network, Various kalman filter design.
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Size: 5120 |
Author: mie |
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Description: 抑制载波型差分相位调制，解耦，恢复原信号，各种kalman滤波器的设计。- Suppressed carrier type differential phase modulation, Decoupling, restore the original signal, Various kalman filter design.
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Size: 6144 |
Author: 环雪东 |
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Description: 抑制载波型差分相位调制，意信号卷积的运算,并且绘制图象，各种kalman滤波器的设计。- Suppressed carrier type differential phase modulation, Convolution operation is intended to signal and image rendering, Various kalman filter design.
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Size: 4096 |
Author: bansaoqoufing |
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