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公开(公告)号：US08120523B2
公开(公告)日：2012-02-21
申请号：US12473880
申请日：2009-05-28
CPC分类号： G01S7/2927 , G01S7/414 , G01S13/953 , Y02A90/18
摘要： The present invention relates to a method of eliminating ground echoes for a meteorological radar. The ground echoes being received from a predetermined area by a radar, the radar illuminating, for a predetermined number R of transmission recurrences, the area over a number P of distance cells, the method includes a step for calculating a spatial statistical parameter of the cluttered echoes received by the radar in response to the recurrences over an analysis path for distance cells, and a step to compare the spatial variation level of the spatial statistical parameter along the analysis path, the echoes being considered to be ground echoes when the level of said variation is greater than a predetermined threshold.
摘要翻译： 本发明涉及一种消除气象雷达地面回波的方法。 通过雷达从预定区域接收地面回波，雷达针对传输重复的预定数量R照射距离小区数目P上的区域，该方法包括用于计算杂乱的空间统计参数的步骤 由雷达接收的响应于距离单元的分析路径的复现的回波;以及比较沿着分析路径的空间统计参数的空间变化水平的步骤，当所述的 变化大于预定阈值。
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2.发明申请Method of determining the velocity field of an air mass by high resolution doppler analysis 失效通过高分辨率多普勒分析确定空气质量的速度场的方法公开(公告)号：US20070063887A1
公开(公告)日：2007-03-22
申请号：US11515952
申请日：2006-09-06
IPC分类号： G01S13/95
摘要： The invention relates to the general field of high resolution doppler analysis of a radiofrequency signal. It deals more particularly with the analysis of the movement of air masses by means of a meteorological radar. The subject of the invention is a high resolution spectral analysis method for a remotely sampled periodic radiofrequency signal, based on the application of a trellis autoregressive filtering Burg algorithm, which can be used to determine the natural frequencies of the received signal for each distance cell based on the determination of an optimum set of reflection coefficients N of the signal. According to the invention, the reflection coefficients are the object of a regularization operation aiming mainly to limit the numerical instabilities of the calculations. Also according to the invention, the regularized reflection coefficients are used to estimate the effective order of the identification model of the trellis filter, and ultimately to determine the natural frequencies of the signal by determining the arguments of the complex roots of the polynomial representing the transfer function of the trellis filter. Again according to the invention, there is determined, for each distance cell, which of the natural frequencies, determined for this distance cell, is the one that represents the doppler frequency of the air mass for this cell. The method according to the invention can advantageously be complemented by the application of an operation for spatially smoothing the reflection coefficients before determining the effective order of the model and searching for the roots of the polynomial. The method according to the invention is particularly well suited to carrying out a high resolution spectral analysis when the latter needs to be carried out based on a small number of signal samples.
摘要翻译： 本发明涉及射频信号的高分辨率多普勒分析的一般领域。 特别是通过气象雷达分析空气质量的运动。 本发明的主题是用于远程采样的周期性射频信号的高分辨率频谱分析方法，其基于网格自回归滤波Burg算法的应用，其可以用于确定每个距离单元的接收信号的固有频率 在确定信号的最佳反射系数集合N时。 根据本发明，反射系数是正常化操作的目的，其目的主要是限制计算的数值不稳定性。 同样根据本发明，使用正则化反射系数来估计网格滤波器的识别模型的有效顺序，并且最终通过确定表示传输的多项式的复根的参数来确定信号的固有频率 网格过滤器的功能。 根据本发明，对于每个距离小区，确定为该距离小区确定的哪个固有频率是表示该小区的空气质量的多普勒频率的哪一个。 根据本发明的方法可以有利地通过在确定模型的有效顺序并搜索多项式的根之前应用用于空间平滑反射系数的操作来补充。 根据本发明的方法特别适用于当后者需要基于少量的信号样本进行时执行高分辨率光谱分析。
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公开(公告)号：US20100176984A1
公开(公告)日：2010-07-15
申请号：US12473880
申请日：2009-05-28
IPC分类号： G01S13/00
CPC分类号： G01S7/2927 , G01S7/414 , G01S13/953 , Y02A90/18
摘要： The present invention relates to a method of eliminating ground echoes for a meteorological radar. The ground echoes being received from a predetermined area by a radar, the radar illuminating, for a predetermined number R of transmission recurrences, the area over a number P of distance cells, the method includes a step for calculating a spatial statistical parameter of the cluttered echoes received by the radar in response to the recurrences over an analysis path for distance cells, and a step to compare the spatial variation level of the spatial statistical parameter along the analysis path, the echoes being considered to be ground echoes when the level of said variation is greater than a predetermined threshold.
摘要翻译： 本发明涉及一种消除气象雷达地面回波的方法。 通过雷达从预定区域接收地面回波，雷达针对传输重复的预定数量R照射距离小区数目P上的区域，该方法包括用于计算杂乱的空间统计参数的步骤 由雷达接收的响应于距离单元的分析路径的复现的回波;以及比较沿着分析路径的空间统计参数的空间变化水平的步骤，当所述的 变化大于预定阈值。
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4.发明授权Method of determining the velocity field of an air mass by high resolution doppler analysis 失效通过高分辨率多普勒分析确定空气质量的速度场的方法公开(公告)号：US07535403B2
公开(公告)日：2009-05-19
申请号：US11515952
申请日：2006-09-06
摘要： A high resolution Doppler analysis of a radiofrequency signal is exemplified by the analysis of air mass movement using meteorological radar. A high resolution spectral analysis method for a remotely sampled periodic radiofrequency signal, based on the application of a trellis autoregressive filtering Burg algorithm, is used to determine the natural frequencies of the received signal for each distance cell based on the determination of an optimum set of reflection coefficients of the signal. Reflection coefficients are the object of a regularization operation aiming to limit the numerical instabilities of the calculations. These regularized reflection coefficients are used to estimate the effective order of the identification model of the trellis filter, and to determine the natural frequencies of the signal by determining the arguments of the complex roots of the polynomial representing the transfer function of the trellis filter.
摘要翻译： 通过使用气象雷达分析空气质量运动，举例说明了射频信号的高分辨率多普勒分析。 基于网格自回归滤波Burg算法的应用，用于远程采样的周期性射频信号的高分辨率频谱分析方法被用于基于最佳集合的确定来确定每个距离小区的接收信号的固有频率 信号的反射系数。 反射系数是旨在限制计算的数值不稳定性的正则化操作的对象。 这些正则化反射系数用于估计网格滤波器的识别模型的有效顺序，并且通过确定表示网格滤波器的传递函数的多项式的复根的参数来确定信号的固有频率。
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5.发明授权Adaptive prediction differential PCM-type transmission apparatus and process with shaping of the quantization noise 失效自适应预测差分PCM型传输装置和具有量化噪声整形的过程
公开(公告)号：US4385393A
公开(公告)日：1983-05-24
申请号：US253159
申请日：1981-04-10
CPC分类号： H03M3/042
摘要： A coding process for the adaptive prediction differential PCM type. An error signal e.sub.t is formed between a sample of signal y.sub.t to be coded and a prediction signal p.sub.t of said signal. The prediction signal p.sub.t is formed from restored signals y.sub.t and e.sub.t by two linear filtering operations, the first relating to N successive samples of y.sub.t and using coefficients A1.sub.t, A2.sub.t, . . . , AN.sub.t and the second relating to P successive samples of e.sub.t and using coefficients B1.sub.t, B2.sub.t, . . . , BP.sub.t, the coefficients A1.sub.t, A2.sub.t, . . . , AN.sub.t and B1.sub.t, B2.sub.t, . . . , BP.sub.t being sequentially adjusted at each time t so that the mean power of error signal e.sub.t is minimal. Instead of carrying out the prediction on the basis of signals y.sub.t and e.sub.t only according to the invention, use is also made of the real signal y.sub.t and the real error e.sub.t. A linear filtering of y.sub.t using the coefficients A1.sub.t, A2.sub.t, . . . , AN.sub.t, these coefficients affecting N successive samples of the signal y.sub.t, a linear filtering of e.sub.t using the coefficients B1.sub.t, B2.sub.t, . . . , BP.sub.t are performed. In addition, the quantities thus obtained are respectively weighted by two coefficients between 0 and 1 and not simultaneously zero.
摘要翻译： 用于自适应预测差分PCM类型的编码过程。 在要编码的信号yt的采样和所述信号的预测信号pt之间形成误差信号等。 预测信号pt由恢复的信号yt和et由两个线性滤波操作形成，第一个与nt的连续样本相关，并且使用系数A1t，A2t。 的。 的。 ANt，第二个涉及et的P个连续样本，并使用系数B1t，B2t，...。 的。 的。 ，BPt，系数A1t，A2t，。 的。 的。 ，ANt和B1t，B2t，。 的。 的。 BPt在每个时间t被顺序地调整，使得误差信号等的平均功率最小。 代替根据本发明的基于信号yt和et的执行预测，也可以使用实际信号yt和实际误差等。 使用系数A1t，A2t，...进行线性滤波。 的。 的。 ANt，这些系数影响信号yt的N个连续样本，使用系数B1t，B2t的线性滤波。 的。 的。 ，执行BPt。 另外，这样获得的量分别由0和1之间的两个系数加权而不是同时为零。
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