估息誤差 的英文怎麼說
中文拼音 [gūxīwùchā]
估息誤差
英文
error of estimation-
Experiment results show : ? he theory and method of information content could play an important role in the case study on the accuracy and application of dem. ( 2 ) in the loess plateau area, there are much difference between 5m resolution dems of 1 : 10000 map scale and 25m resolution dems of 1 : 50000 map scale while gathering terrain characteristic information, and yet the spatial structure of dem error have discipline and measurability on statistics. ( ? the results could offer fundamentals and methods to people on their work to research the terrain information content of dems with different scale level
研究結果顯示： 1 、地形信息容量的理論與方法對于dem精度與應用適宜性的研究具有重要的作用； 2 、在黃土丘陵溝壑區，同1 ： 1萬比例尺5米解析度的dem相比， 1 ： 5萬比例尺25米解析度dem在提取地形特徵方面具有較大的差異，但誤差的量值與空間分佈具有統計上的規律性與可估算性； 3 、以上研究結果可望為其它各級比例尺dem地形信息容量的研究提供新的理論基礎與技術方法，也可為有關規范、標準的制定提供依據。From the result we get the following conclusion : for narrow - band signal, the effect of the method based on fft is best. for wide - band signal, when snr is up to certain degree ( higher than - 7db or so ), the curves of square error of modified methods are more obvious and closer to crb. for an echo composed of more than one frequency or direction, space - frequency distribution could show more direct information of frequency and direction, which is more advantaged to make precise judge and estimation for doa of echo
從估計結果發現，對于窄帶回波信號，基於fft的方法估計性能大大優于其他方法；對于寬帶回波信號，在信噪比達到一定程度（高於約- 7db ）時，補償后的幾種估計法的性能改善均比較明顯，誤差曲線越來越接近crb曲線；對于回波中存在多頻率多方位的情況，空間?頻率分布圖能提供較為直觀的頻率及方位信息，因此應用空間?頻率估計法來進行方位估計，更有利於進一步對回波的具體方位進行準確判斷和估計。As far as the system observation for accuracy evaluation of carrier rocket is concerned, there may exist different types of observed data and priors. heterogeneous information means that the different information describing the different characteristics of the same object. since all of the information is relevant to the same object, the fusion is possible. it is a key problem that how to fuse the heterogeneous information to obtain the better evaluation result. therefore, the different heterogeneous information and data is thoroughly studied, moreover, the mathematical description for information fusion of different parameter priors and data is constructed in this paper. based on their relationship between different parameters, indirect prior and observation data is transformed into prior in impact point observation space, which is fused with original prior by weight determined by maximum entropy rule to obtain the mixed posterior distribution. therefore, the test results can be given by combining posterior distribution and impact error observed data. then its application on evaluating guidance systematic error is elaborated as it applies trajectory tracking data, test value of coefficients of guidance instrumentation systematic error, impact point observation data and prior. especially, the advantage of this method lies in its application in case that guidance instrumentation systematic error may not be computed precisely. finally a detailed example on evaluation of carrier rocket is given to verify the theory
為充分利用運載火箭觀測中的不同觀測空間和過程的信息來進行精度評估，針對該背景建立了異質先驗融合的數學描述.研究了飛行試驗中不同觀測空間和過程的異質先驗信息和數據，基於不同觀測過程的解析關系，將間接過程的先驗和觀測數據算出的后驗分佈轉換成落點觀測空間上的先驗，與原落點的先驗進行了最大熵加權融合，得到混合后驗分佈，從而結合落點觀測數據給出評定結果.在無法解算出精確的制導工具誤差系數的情況下，這種方法充分利用了彈道跟蹤數據、工具誤差系數的地面測試先驗值、落點先驗及落點數據，穩健性更好，準確性更高Through applying the three methods of term structure estimation to the construction of zero - yield curve and to the pricing of zero - bond, zero - bond option, coup bond, interest rate swap, interest rate swap option, interest rate cap, interest rate floor, forward rate agreement. comparing the calculation errors of the three methods of term structure estimation
通過將這三種期限結構估測方法應用於零息收益曲線構造，應用於零息國債及其期權、附息債券、利率互換、利率互換期權、遠期利率協議、利率上限、利率下限等利率衍生產品價格的估測，並比較所估測結果的誤差，得出的結論是：三種期限結構估測方法會導致在計算不同利率衍生產品價格時產生差異。The error propagation path is changed because that the different substream sets are selected for specific spatial and temporal resolution, but this rate - distortion model is adaptive with different error propagation paths. we can easily estimate the distortion at different error propagation situation
盡管在復雜的可擴展視頻編碼技術中，誤差傳遞路徑會隨著選擇播放的子碼流集不同而變化，本文建立的模型卻能夠自適應誤差傳遞路徑的變化，估計出較為準確的失真信息。Traditional inertial mechanized - platform uses velocities to damp the system attitude to improve the precision of attitude, when the system acceleration is small. referring to the idea, this paper designeda damp kalman filter in strap - down attitude heading reference system ( ahrs ). the new method makes use of 3 - d accelerometer ' s measurements to estimate the system attitude, which is measured to compensate attitude errors. because the acceleration affected the precision of fiher directly, the fuzzy adaptive system was presented. the fuzzy logic inputs are three accelerations and the output is to control the measurement noise covariance matrix. simulations and experimental results prove that the damp algorithm can damp most of schuler oscillation and foucauh oscillation, so that to assure the filter convergence and efficiently improve the precision of strap - down ahrs
在系統機動性不強的情況下，傳統的平臺內阻尼演算法將系統本身的速度信息通過阻尼網路加到系統中，達到提高姿態角精度的目的.將這種平臺內阻尼的思想引入到捷聯慣性航姿系統中，在系統加速度較小的情況下，利用加速度計的輸出估計系統姿態角，通過卡爾曼濾波的形式補償系統姿態誤差.由於加速度的大小直接影響濾波器精度，本文設計了模糊自適應卡爾曼濾波演算法，根據三軸加速度計的輸出調整內阻尼量測誤差方差陣，從而避免了濾波器的發散.模擬和實驗驗證，內阻尼演算法可明顯抑制舒勒周期振蕩和傅科周期振蕩，避免了系統姿態漂移，有效提高了捷聯慣性航姿系統的精度After the system has been synchronized, we first use the least square method to make channel estimation, then separate the channel response information from the channel noises by dft. a weighting function based on the minimum mean square error ( mmse ) criteria can be applied to the time domain channel impulse response
在系統同步條件下，首先使用最小平方方法來估計通道響應，然後利用離散傅利葉變換的性質把通道響應信息和通道噪聲分離，並在時域按最小均方誤差準則做加權處理。Performance simulation of the proposed estimator including mean squares error ( mse ) of channel and uncoded bit error rate ( ber ) have been taken, and the results show the estimator is efficient and very flexible
對通道盲估計的均方誤差（ mse ）和由此演算法獲得的通道的狀態信息，對無編碼的ofdm系統進行解一調的誤比特率進行了模擬。The data used in the risk assessment of regional natural disasters imply the information not only on time but also on space. when the spatial information of the data is incomplete, it is necessary to optimize the data in order to reduce the error of the assessment. in the counterpart of the paper in last issue of the journal the theoretical investigation of the problem was carried out and the imcomplete information occured in risk assessment of regionalnatural disasters were class ifiedinto two types with treatment of interpolation model and correcting model res pectively. the former model is for insufficiency of the data and the later is for the case in which the accuracy of the data is not enough. inthispaper, taking the flood sustained by rural area plant in hunan province as an example, it is explained how to use the models to calculate. the models are examined as well
區域自然災害風險評估中所用的數據不僅具有時間的意義，而且具有空間的意義，當數據的空間信息不完備時，需要對其進行優化處理，以減小風險評估的誤差，作者在本刊上一期的一篇文章中已進行了這方面的理論探討，將區域自然災害風險評估中所遇到的空間不完備信息分為兩類，分別用插補模型和校正模型進行了處理，插補模型是針對空間數據缺失情況的，而校正模型是針對空間數據不符合精度需要情況的，本文以湖南省農村種植業水災為例，進一步說明如何應用這些模型來進行計算，並對其進行了檢驗Use the magnetic vector for the observation information, the paper estimate the location and rate of the satellite, analysis of simulation results and the sources of error. to further enhance navigation accuracy, the paper study the unscented kalman filter, compare with the extend kalman filter. in the same initial conditions of the extend kalman filter, we do the simulation
其次，基於磁環境模擬系統的測量數據，本文研究了擴展卡爾曼濾波演算法，建立了衛星的運動學和動力學方程，以地磁場矢量為觀測信息，對衛星位置速度進行了估計，並分析了模擬結果及誤差來源，為了進一步提高導航精度，本文又研究了unscented卡爾曼濾波演算法，給出了原理及步驟，並與擴展卡爾曼濾波進行了比較分析。The discussion includes : fast real - time simulation algorithms ; real - time combining algorithms and real - time parallel algorithm on net parallel computers ; real - time simulation algorithms and real - time simulation parallel algorithms for differential - algebraic system ; real - time discontinuity treatment ; information transference error of simulation model ; investigation of spurious solutions of digital simulation for dynamic systems, etc. some new ideas and methods of constructing real - time simulation algorithms are given
討論包括：快速實時模擬演算法研究；實時組合演算法與網路計算機上的實時并行演算法；微分代數系統的實時演算法與實時并行演算法；實時間斷處理；模擬模型信息傳輸誤差估計；動力學系統模擬假解研究等一些新的思想和方法。Because the ins error equation is unstable, some initial states error will cause error floating and error accumulating, if the filter observations were only position error, kalman filter will converge very slowly, and some states error ( such as yaw error ) will be great. since the milemeter altimeter and piloting could only output position information, this paper put forward a method, firstly estimateing states and then kalman filtering, to improve filtering effect. simulation proved that this method could effectively reduce the system states error, quicken filtering convergence and improve filtering precision
由於慣導系統（ lsins ）的誤差方程是發散的，某些初始狀態的誤差會引起誤差的漂移和積累，當觀測量只有位置誤差時，卡爾曼濾波的收斂速度很慢，某些狀態（如方位角）誤差很大，而以上除慣導外的其它導航傳感器直接提供的只是位置信息，為了改善濾波器性能，本文根據里程計等傳感器的特點，提出了首先對狀態做出估計，然後在狀態估計的基礎上，進行卡爾曼濾波的方法。But according to the concluding process of dd model, actually the residuals from dd model regression, are only the proxies of the estimations errors of current accruals. but total accruals contain current accruals and non - current accruals, so if we directly use the proxies of current accruals as the proxies of total accruals, is it correct ? jones model is usually used to calculate the abnormal accruals reflecting the extent to which the management manipulate the earnings, but the management intent to manipulate is unobservable and likely idiosyncratic and sporadic
但從理論上分析，由於利用dd模型回歸計算殘差過程中未考慮非流動性應計，因此該殘差中未能含有非流動性應計的錯誤信息，可能會使該指標在計量盈餘質量時產生一定的噪音;對于瓊斯模型，其更多地反映的是基於管理者有一定意圖的盈餘管理，而不能有效地計量無意圖的評估錯誤，因此使用該指標也可能會在計量盈餘質量時產生一定的誤差。Data reconciliation is one of the key elements of cims ( computer integrated manufacture system ) in process industry. by using the redundancy in measurements and process models, it can eliminate mesaurements with gross error ( mges ). reduce random measurment errors and estimate unmeasured variables by using statistical methods
數據協調技術是流程工業cims的關鍵，它利用信息的冗餘性，結合各種統計分析方法和生產過程機理，剔除原始數據中的顯著誤差，降低隨機誤差的影響，並設法估計出未測變量，保證了cims信息源的真實性。Take the hoc based blind modulation detection algorithm as an example, the relationship between the blind modulation detection algorithm and synchronization is investigated. an unproved detection algorithm robust to frequency offset is proposed which solves the problem caused by the error in carrier synchronization. how to synchronize a received signal with unknown modulation type is studied and a blind algorithm to estimate symbol timing of the signals with unknown modulation type is presented
研究了載波同步和碼元定時同步與調制方式盲檢測演算法的關系；以自適應單載波中高階累積量調制方式盲檢測演算法為例，對于載波同步誤差引起的頻偏問題，提出一種基於頻偏穩健的mdpsk信號調制方式盲檢測演算法；對于未知調制方式信號的定時同步問題，提出一種盲定時估計演算法，該演算法可以估計mdpsk和mqam信號的定時同步信息，實現數字信號的同步分類；提出了一種基於調制方式盲檢測的自適應接收機結構，把調制方式盲檢測，信噪比估計和同步解調聯合起來進行，實現調制方式隨通道質量而自適應變化的信號的正確接收。The method estimates the loss of actuator effectiveness based on the augmented error, which is composed of the output estimation error generated by an adaptive observer and the auxiliary error. the actuator fault estimation can be used to reconfigure the control law to recover the system performance
增廣誤差不僅包括自適應觀測器所獲得的反映故障信息的輸出殘差，還包括由輸入構造的輔助誤差，利用該誤差信息設計了一種自適應參數估計的演算法估計執行器故障，根據估計出的故障給執行機構以相應的補償，恢復系統的性能。For the image sequences super - resolution, we develop a new motion estimation algorithm in image sequences. instead of using only two frames from the sequence, the new algorithm uses the whole sequence to estimate the motion vector of each frame, and is more accurate and robust than the former classical motion estimation algorithms. the algorithm also provides a reliability measure of the estimated result, which was introduced into the super - resolution image reconstruction to overcome the influence of the estimation error
在光學圖像序列超解析度方面，提出了融合多次估計的圖像序列運動估計方法，將圖像序列作為一個整體來計算每一幀的運動矢量，克服了以往的運動估計中只利用兩幀圖像的信息的局限，提高了運動估計的準確性和穩健性；給出了運動估計的置信度度量，並將其引入到圖像恢復演算法中，進一步克服了運動估計誤差的影響。分享友人