共查询到20条相似文献，搜索用时 156 毫秒
1.
A new algorithm, called as Double-Epoch Algorithm (DEA) is proposed in GPS rapid positioning using two epoch single frequency phase data in this paper. Firstly, the structure characteristic of the normal matrix in GPS rapid positioning is analyzed. Then, in the light of the characteristic, based on TIK-HONOV regularization theorem, a new regularizer is designed to mitigate the ill-condition of the normal matrix. The accurate float ambiguity solutions and their MSEM (Mean Squared Error Matrix) are obtained, using two epoch single frequency phase data. Combined with LAMBDA method, DEA can fix the integer ambiguities correctly and quickly using MSEM instead of the covariance matrix of the ambiguities. Compared with the traditional methods, DEA can improve the efficiency obviously in rapid positioning. So, the new algorithm has an extensive application outlook in deformation monitoring, pseudokinematic relative positioning and attitude determination, etc. 相似文献
2.
单频GPS短基线快速定位中的少数历元算法 总被引：2，自引：0，他引：2
研究了短基线时利用少数历元的单频GPS载波相位观测值进行快速定位的一种算法。基于TIK-HONOV正则化原理，选择了一种具有物理意义的正则化矩阵，以减弱法矩阵的病态性。新算法只需解算几个历元的单频GPS相位数据，就可得到比较准确的模糊度浮动解及其相应的均方误差矩阵，用均方误差矩阵代替协方差阵，结合LAMBDA方法，可准确、快速地确定模糊度，最后得到基线向量的解。结合短基线算例，将少数历元算法与最小二乘估计的结果作了比较分析，得出了新解法的有效性。 相似文献
3.
4.
单频GPS快速定位中病态问题的解法研究 总被引：20，自引：3，他引：17
研究只利用少数历元GPS载波相位观测值进行快速定位时的新解法.在分析病态法矩阵结构特性的基础上,基于TIKHONOV正则化原理,提出一种选择正则化矩阵R的新方法,减弱法方程的病态性.与其他方法相比,新方法得到与模糊度准确值更接近的浮动解及其相应的均方误差矩阵.结合LAMBDA方法,用均方误差矩阵代替协方差阵确定模糊度的搜索范围,可准确快速地确定模糊度,最后得到基线向量的解.结合算例,将新解法与最小二乘估计、岭估计和截断奇异值法分别结合LAMBDA方法解算模糊度的结果进行比较分析,展示新解法的效果. 相似文献
5.
用遗传算法搜索GPS单频单历元整周模糊度 总被引：10，自引：2，他引：10
介绍了短基线利用单频单历元双差载波相位定位时模糊度固定的基本理论，探讨了利用遗传算法快速搜索GPS单频单历元整周模糊度的一些理论和实现的方法．提出了用改进的正则化方法改善浮动解来提高搜索成功率的新思路。算例分析表明，在一定的条件下．应用遗传算法搜索整周模糊度成功率高、稳键性较好。 相似文献
6.
一种GPS测定姿态的新方法——具有坐标函数约束的单历元阻尼LAMBDA算法 总被引：7，自引：1，他引：7
在作者提出的GPS单历元阻尼LAMBDA算法的基础上,结合固定边长条件,给出了一种GPS姿态定位的新方法。该方法的特点在于:(1)仅利用当前一个历元的GPS观测数据;(2)在单历元法方程中添加阻尼矩阵,克服了LAMBDA方法的局限性,提高了模糊度搜索速度;(3)利用三台接收机的固定边长条件直接平差,可以提高模糊度解算的可靠性和定位精度。 相似文献
7.
针对单频GPS动态定位中常用模糊度求解方法存在的问题,提出一种整周模糊度快速解算方法。首先通过对双差观测方程中坐标参数的系数阵进行QR分解变换以消除坐标参数,从而仅对模糊度参数建立Kalman滤波方程进行估计,然后利用排序和双Cholesky分解对滤波得到的模糊度进行降相关处理,并结合收缩模糊度搜索空间的思想来搜索固定整周模糊度。以实测的动态数据为例对该方法进行测试。分析结果表明,该方法不但可以改善模糊度浮点解精度,而且具有良好的模糊度降相关效果,可正确有效地实现整周模糊度的快速解算。 相似文献
8.
Due to the different signal frequencies for the GLONASS satellites, the commonly-used double-differencing procedure for carrier phase data processing can not be implemented in its straightforward form, as in the case of GPS. In this paper a novel data processing strategy, involving a three-step procedure, for integrated GPS/GLONASS positioning is proposed. The first is pseudo-range-based positioning, that uses double-differenced (DD) GPS pseudo-range and single-differenced (SD) GLONASS pseudo-range measurements to derive the initial position and receiver clock bias. The second is forming DD measurements (expressed in cycles) in order to estimate the ambiguities, by using the receiver clock bias estimated in the above step. The third is to form DD measurements (expressed in metric units) with the unknown SD integer ambiguity for the GLONASS reference satellite as the only parameter (which is constant before a cycle slip occurs for this satellite). A real-time stochastic model estimated by residual series over previous epochs is proposed for integrated GPS/GLONASS carrier phase and pseudo-range data processing. Other associated issues, such as cycle slip detection, validation criteria and adaptive procedure(s) for ambiguity resolution, is also discussed. The performance of this data processing strategy will be demonstrated through case study examples of rapid static positioning and kinematic positioning. From four experiments carried out to date, the results indicate that rapid static positioning requires 1 minute of single frequency GPS/GLONASS data for 100% positioning success rate. The single epoch positioning solution for kinematic positioning can achieve 94.6% success rate over short baselines (<6 km). 相似文献
9.
改进的ARCE方法及其在单频 GPS快速定位中的应用 总被引：4，自引：0，他引：4
基于TIKHONOV正则化原理，设计了一种正则化矩阵的构造方法，将ARCE(ambiguity resolution using constraint equation)方法进行了改进。通过新的正则化矩阵的作用，减弱了GPS快速定位中少数历元情形下法矩阵的病态性，得到了比较准确的模糊度浮动解，大大减小了模糊度的搜索范围，利用ARCE方法固定模糊度的成功率高。并结合一个算例，验证了本文改进方法的效果。 相似文献
10.
单频GPS快速定位方程是严重病态的,应用最小二乘原理得到的模糊度浮点解大大偏离其准确值,应用LAMBDA方法难以正确地固定模糊度。本文将GPS载波相位双差观测量在不同的小波空间和尺度空间进行分解和重构,去除高频测量噪声,可减小测量噪声对GPS快速定位中病态方程解的影响,提高模糊度浮点解的精度,缩小模糊度搜索空间。实验表明,对于GPS短基线,仅利用1min左右的单频载波观测数据,经过基于haar、db4、coif4和sym4小波的5尺度小波变换后,可获得较准确的模糊度浮点解,应用LAMBDA法可正确地固定模糊度,达到厘米级定位精度。 相似文献
11.
DAI LiwenHAN ShaoweiChris Rizos 《地球空间信息科学学报》2001,4(4):9-18
1 ＩｎｔｒｏｄｕｃｔｉｏｎＲｅａｌ＿ｔｉｍｅｋｉｎｅｍａｔｉｃＧＰＳｐｒｅｃｉｓｅｐｏｓｉｔｉｏｎｉｎｇｈａｓｂｅｅｎｐｌａｙｉｎｇａｎｉｎｃｒｅａｓｉｎｇｒｏｌｅｉｎｂｏｔｈｓｕｒｖｅｙｉｎｇａｎｄｎａｖｉｇａｔｉｏｎ ,ａｎｄｈａｓｂｅｃｏｍｅａｎｅｓｓｅｎｔｉａｌｔｏｏｌｆｏｒｐｒｅｃｉｓｅｒｅｌａｔｉｖｅｐｏｓｉｔｉｏｎｉｎｇ .Ｈｏｗｅｖｅｒ,ｒｅｌｉａｂｌｅａｎｄｃｏｒｒｅｃｔａｍｂｉｇｕｉｔｙｒｅｓｏｌｕｔｉｏｎｄｅｐｅｎｄｓｏｎｏｂｓｅｒｖａ ｔｉｏｎｓｕｐｏｎａｌａｒｇｅｎｕｍｂｅ… 相似文献
12.
长距离网络RTK是实现GPS/BDS高精度实时定位的主要手段之一,其核心是长距离参考站网GPS/BDS整周模糊度的快速准确确定。本文提出了一种长距离GPS/BDS参考站网载波相位整周模糊度解算方法,首先利用GPS双频观测数据计算和确定宽巷整周模糊度,同时利用BDS的B2、B3频率观测值确定超宽巷整周模糊度。然后建立GPS载波相位整周模糊度和大气延迟误差的参数估计模型,附加双差宽巷整周模糊度的约束,解算双差载波相位整周模糊度,并建立参考站网大气延迟误差的空间相关模型。根据B2、B3频率的超宽巷整周模糊度建立包含大气误差参数的载波相位整周模糊度解算模型,利用大气延迟误差空间相关模型约束BDS双差载波相位整周模糊度的解算。克服了传统的使用无电离层组合值解算整周模糊度的不利影响。采用实测长距离CORS网GPS、BDS多频观测数据进行算法验证,试验结果证明该方法可实现长距离参考站网GPS/BDS载波相位整周模糊度的准确固定。 相似文献
13.
论文介绍了GPS/GLONASS组合静态相位相对定位模型,将GLONASS双差观测方程的模糊度参数表示成参考卫星的单差模糊度和双差模糊度参数;用误差分析法证明了单差模糊度按实参数估计不影响基线解算精度,而GLONASS双差模糊度必须按整参数进行解算;用Helmert方差分量估计确定GPS和GLONASS观测值的合理权比。实际观测数据处理结果表明：GPS/GLONASS组合定位较单一系统解算的基线精度均有提高,尤其比GLONASS单系统的解算精度有显著提高,比GPS单系统的精度也有适当提高,其中单历元基线解算精度约提高了10%,当单一系统的可用卫星数少于4颗时,GPS/GLONASS组合定位更具有应用价值。 相似文献
14.
15.
将一种求解病态法方程的新方法——谱修整迭代法应用于单频GPS接收机快速静态定位。根据对实测数据的计算表明谱修整迭代法使静态定位可以在较短得时间内获得较精确的整周模糊度浮点解,因而缩小了整周模糊度的搜索范围,加快了静态定位的速度。 相似文献
16.
中长基线GPS网络 RTK模糊度快速解算的一种新方法 总被引：3，自引：0，他引：3
提出采用选权拟合的正则化方法。利用参考站坐标准确已知的条件作为约束，设计出正则化矩阵，使法矩阵的病态性得到了较大的改善，只用几个历元的数据求解，能较准确得到模糊度的浮点解。在此基础上，结合LAMBDA方法可以快速地确定整周模糊度。以4条中长基线的实测数据为例，本文方法用5个历元的单频L1数据就能求解出整周模糊度。与现有方法相比，新方法可采用单频GPS数据实现中长基线GPS网络RTK的整数模糊度快速解算，而且可靠性好，有良好的应用前景。 相似文献
17.
基于区域参考站网的网络实时动态定位(real-time kinematic,RTK)方法是实现全球定位系统(global positioning system,GPS)、北斗卫星导航系统(BeiDou satellite navigation system,BDS)高精度定位的主要手段.研究了一种长距离GPS/BDS双... 相似文献
18.
Increasing GNSS RTK availability with a new single-epoch batch partial ambiguity resolution algorithm 总被引：7，自引：4，他引：3
Alex Parkins 《GPS Solutions》2011,15(4):391-402
GPS Single-epoch Real-Time Kinematic positioning is immune to cycle slips and can be immediately re-initialized after loss-of-lock,
providing high availability. This technique requires reliable ambiguity resolution: incorrect ambiguities can cause position
errors of several meters, and failed ambiguity resolution reduces availability. However, a bias or inaccuracy in a single
phase observation can prevent successful resolution of the whole set of ambiguities. Partial ambiguity resolution allows a
subset of ambiguities to be resolved with greater probability of success than the full set. A new algorithm for resolving
a subset of ambiguities with validation from previous epochs is described. If normal ambiguity resolution fails, all ambiguity
subsets are generated and ordered with the best subsets first. Each subset is then resolved in turn. Fixed subsets are validated
against values from previous epochs; this validation procedure greatly reduces the proportion of epochs with incorrect ambiguities.
An additional algorithm is described that uses the fixed ambiguities as precise ranges to resolve the remaining unfixed ambiguities.
In order to test these new algorithms, GPS data were collected from static and ship-based GPS receivers around Harwich harbor
and processed from reference stations at distances up to 111 km. In the static tests the distance over which a 90% ambiguity
resolution success rate for dual-frequency data was achieved was increased from 15 to 76 km. However, in some cases, the processing
time was too long for this algorithm to be practical without a time-based cut-off. There is also a risk of incorrect ambiguities
being propagated, particularly for single-frequency processing. In a ship-based test, the distance over which sufficient availability
to support harbor navigation was achieved using single-epoch dual-frequency RTK was increased from 1 to 66 km. 相似文献
19.
一种附约束的单频单历元GPS双差相位解算方法 总被引：8，自引：1，他引：8
在各类变形观测中，存在着2次观测的变形值不大及各种变形方向和大小可以比较精确预测等特点，可以把这些特征作为约束条件，对GPS单历元相位观测方程进行求解。基于以上几点，提出了一种含约束条件的单频单历元GPS相位求解算法和简单实用的模糊度搜索方法，本方法据观测值直接估计模糊度参数，并根据求出的模糊度估值进行搜索，还分析了最优解的获得和检验方法，最后用2个实例说明了该法的有效性和实用性。 相似文献