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公开(公告)号：US5629707A
公开(公告)日：1997-05-13
申请号：US369617
申请日：1995-01-06
CPC分类号： G01S5/02 , H04B7/1855
摘要： A subscriber unit (26) communicates with a satellite (12) using electromagnetic signals so that observations (102) of the signals are obtained. Surface contours are generated (104) based on the signal component measured. The surface contour intersections produce candidate locations on the earth's surface. The candidate locations seed a least-squares estimation to produce final locations. Data produced during the least-squares fit is used to generate confidence ellipses (116) about the final locations. Most likely actual locations are determined from the fit associated with the confidence regions. A variety of signal source measurements can be used while providing a best estimate of a signal source location when an exact solution is not mathematically possible. The location is converted to coordinates that can be used in a satellite communication system (10) for making decisions regarding the granting or denying of communication services, billing rate and the like.
摘要翻译： 用户单元（26）使用电磁信号与卫星（12）进行通信，从而获得信号的观察（102）。 基于测量的信号分量生成表面轮廓（104）。 表面轮廓交点产生地球表面上的候选位置。 候选位置种下最小二乘估计以产生最终位置。 在最小二乘拟合期间产生的数据用于生成关于最终位置的置信椭圆（116）。 最可能的实际位置由与置信区域相关联的拟合确定。 当精确的解决方案在数学上不可能时，可以使用各种信号源测量，同时提供信号源位置的最佳估计。 该位置被转换为可用于卫星通信系统（10）中的坐标，用于作出关于授予或拒绝通信服务，计费费率等的决定。
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公开(公告)号：US4682174A
公开(公告)日：1987-07-21
申请号：US785125
申请日：1985-10-07
申请人： Carl T. Richmond , Joseph O. Lester
发明人： Carl T. Richmond , Joseph O. Lester
IPC分类号： G01S13/534 , G01S13/52
CPC分类号： G01S13/534
摘要： A surface acoustic wave (SAW) device in a pseudo-coherent moving target indicator uses a common input transducer to delay both reference and signal inputs to a mixer by varying amounts. The mixer produces a Doppler signal which is processed within a single range cell. The SAW device may contain additional delay paths which drive other range cells. Power splitting and amplification sections of the moving target indicator are minimized through use of the SAW device.
摘要翻译： 伪相干运动目标指示器中的表面声波（SAW）装置使用公共输入换能器，通过变化量将参考和信号输入延迟到混合器。 混频器产生在单个范围单元内处理的多普勒信号。 SAW器件可以包含驱动其它范围单元的附加延迟路径。 通过使用SAW器件使移动目标指示器的功率分配和放大部分最小化。
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公开(公告)号：US07558235B2
公开(公告)日：2009-07-07
申请号：US10704296
申请日：2003-11-07
摘要： In a network comprising a plurality of channels, at least two channels are operating at different frequencies. The fixed network equipment (FNE; 124, 126) identifies a plurality of channels present at a serving site and classifies each channel into one of a plurality of bandwidth groups. All the channels in a given bandwidth group have common roaming characteristics. The FNE periodically broadcasts information relating to at least one channel in each bandwidth group present at the serving site. The FNE further identifies least one channel present at an adjacent site. Each channel present at the adjacent site is also classified in one of the plurality of bandwidth groups. The FNE broadcasts information on loading for each bandwidth group present at the adjacent site.
摘要翻译： 在包括多个信道的网络中，至少两个信道以不同的频率工作。 固定网络设备（FNE; 124,126）识别在服务站点处存在的多个信道，并将每个信道分成多个带宽组中的一个。 给定带宽组中的所有通道具有常见的漫游特性。 FNE周期性地广播与在服务站点处存在的每个带宽组中的至少一个信道有关的信息。 FNE进一步识别存在于相邻站点的最少一个通道。 存在于相邻站点的每个信道也被分类为多个带宽组中的一个。 FNE广播关于在相邻站点处存在的每个带宽组的加载的信息。
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4.发明授权Method and apparatus for real-time adaptive interference cancellation in dynamic environments 失效在动态环境中实时自适应干扰消除的方法和装置
公开(公告)号：US5612978A
公开(公告)日：1997-03-18
申请号：US453420
申请日：1995-05-30
CPC分类号： H04B1/7102 , H04L25/03159 , H04L25/03993 , H04L2025/03522
摘要： A finite impulse response filter performs an FFT on a signal, multiplies it by a transfer function in the frequency domain, and then performs an inverse FFT. The transfer function is dynamically computed in real-time by detecting signal energy in the frequency domain and turning off bins that contain the signal. The signal is delayed prior to turning off the bin in a FIFO memory by an amount equal to the time required to compute the transfer function. In this way, relatively fast changes in the interference environment can be tracked and rejected. For example, short duration narrow band interference signals in the presence of a wideband signal of interest, including direct sequence (DS) spread-spectrum signals in the presence of frequency hopped (FH) spread spectrum signals are rejected. The received signal quality of DS spread spectrum signals is improved.
摘要翻译： 有限脉冲响应滤波器对信号执行FFT，将其乘以频域中的传递函数，然后执行逆FFT。 通过检测频域中的信号能量并关闭包含信号的信息箱，实时动态计算传递函数。 在将FIFO存储器中的存储器关闭等于计算传递函数所需时间的量之前，信号被延迟。 以这种方式，可以跟踪和拒绝干扰环境中相对较快的变化。 例如，在存在频率信号（FH）扩频信号的情况下，存在感兴趣的宽带信号（包括直接序列（DS））扩频信号的情况下，短暂的窄带干扰信号被拒绝。 提高了DS扩频信号的接收信号质量。
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