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1.发明授权公开(公告)号：US07248208B2
公开(公告)日：2007-07-24
申请号：US10865407
申请日：2004-06-10
IPC分类号： G01S13/08
CPC分类号： G01S13/882 , G05D1/0858
摘要： A method for maintaining a position of a hovering vehicle that incorporates a radar altimeter is described. The method includes receiving signals at the radar altimeter based on a change of horizontal direction, operating the radar altimeter to generate a Doppler frequency spectrum based on the received signals, and determining a change in vehicle direction and velocity which will reduce a width of the Doppler frequency spectrum of the received signals. A radar altimeter which generates the Doppler frequency spectrum is also described.
摘要翻译： 描述了一种维持包括雷达高度计的悬停车辆的位置的方法。 该方法包括基于水平方向的变化在雷达高度计上接收信号，操作雷达高度计以基于接收到的信号产生多普勒频谱，并确定车辆方向和速度的变化，这将减小多普勒的宽度 接收信号的频谱。 还描述了产生多普勒频谱的雷达高度计。
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公开(公告)号：US07064703B2
公开(公告)日：2006-06-20
申请号：US10780411
申请日：2004-02-17
申请人： Lavell Jordan , James R. Hager
发明人： Lavell Jordan , James R. Hager
IPC分类号： G01S13/08
CPC分类号： G01S13/288 , G01S7/288 , G01S13/882
摘要： A method for randomly phase modulating a radar altimeter is described. The method includes momentarily applying a signal from a random noise source to an amplifier, applying an output of the amplifier to a voltage controlled oscillator (VCO), applying an output of the VCO to a transmitter and mixer of the radar altimeter to modulate transmissions of the radar altimeter and to demodulate reflected radar transmissions received by the radar altimeter and holding the output of the amplifier constant from before a radar altimeter transmission until after reception of the reflected radar signals from that transmission by the radar altimeter. The method further includes repeating the applying steps and the holding step.
摘要翻译： 描述了雷达高度计的随机相位调制方法。 该方法包括将随机噪声源的信号瞬时施加到放大器，将放大器的输出施加到压控振荡器（VCO），将VCO的输出施加到雷达高度计的发射机和混频器，以调制 并且对由雷达高度计接收到的反射雷达传输进行解调，并将雷达高度计传输之前的放大器的输出保持恒定，直到雷达高度计从该传输接收到反射的雷达信号为止。 该方法还包括重复施加步骤和保持步骤。
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公开(公告)号：US06885334B1
公开(公告)日：2005-04-26
申请号：US10885860
申请日：2004-07-07
CPC分类号： G01S13/882 , G01S13/288 , G01S13/426 , G01S13/94
摘要： Methods and apparatus for detecting obstacles in the flight path of an air vehicle are described. The air vehicle utilizes a radar altimeter incorporating a forward looking antenna and an electronic digital elevation map to provide precision terrain aided navigation. The method comprises determining a position of the air vehicle on the digital elevation map, selecting an area of the digital elevation map in the flight path of the air vehicle, based at least in part on the determined air vehicle position, and scanning the terrain representing the selected map area with the forward looking antenna. The method also comprises combining the digital elevation map data for the selected map area with radar return data for the scanned, selected area and displaying the combined data to provide a representation of the terrain and obstacles in the forward flight path of the air vehicle.
摘要翻译： 描述了用于检测飞行器的飞行路径中的障碍物的方法和装置。 该机动车辆采用了包含前视天线和电子数字高程图的雷达高度计，以提供精确的地形辅助导航。 该方法包括：至少部分地基于所确定的空中飞行器位置，在数字高程图上确定空中交通工具的位置，选择飞行器的飞行路径中的数字高程图的区域，以及扫描表示 所选择的地图区域与前瞻性天线。 该方法还包括将用于所选择的地图区域的数字高程图数据与扫描的所选择的区域的雷达返回数据相结合，并且显示组合的数据以提供空中交通工具的前进飞行路径中的地形和障碍物的表示。
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公开(公告)号：US06734820B2
公开(公告)日：2004-05-11
申请号：US10144744
申请日：2002-05-13
IPC分类号： G01S1353
CPC分类号： G01S13/524 , G01S3/48 , G01S7/292 , G01S13/18 , G01S13/20 , G01S13/288 , G01S13/42 , G01S13/70 , G01S13/882 , G01S13/94
摘要： An in-phase/quadrature component (IQ) mixer is configured to reject returns from a negative doppler shift swath in order to mitigate corruption of returns of a positive doppler shift swath. The mixer includes a sample delay element which produces a quadrature component from the in-phase component of an input signal. Further included are a plurality of mixer elements, a plurality of low pass filters, a plurality of decimators, and a plurality of all pass filters which act upon both the in-phase and quadrature components of the input signal. Also, a subtraction element is included which is configured to subtract the filtered and down sampled quadrature component from the filtered and down sampled in-phase component.
摘要翻译： 配置同相/正交分量（IQ）混频器以拒绝来自负多普勒频移帧的返回，以便减轻正多普勒频移帧的返回的损坏。 混频器包括采样延迟元件，其从输入信号的同相分量产生正交分量。 还包括多个混频器元件，多个低通滤波器，多个抽取器和多个全通滤波器，其对输入信号的同相和正交分量起作用。 此外，包括减法元件，其被配置为从滤波和下采样的同相分量中减去滤波和下采样的正交分量。
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公开(公告)号：US06731234B1
公开(公告)日：2004-05-04
申请号：US10458943
申请日：2003-06-11
申请人： James R. Hager , Lavell Jordan
发明人： James R. Hager , Lavell Jordan
IPC分类号： G01S1318
CPC分类号： G01S13/18 , G01S13/22 , G01S13/288 , G01S13/882
摘要： A method for suppressing ground return radar fading in a radar altimeter is described. The method includes providing a radar gate width which corresponds to an area that is smaller than an antenna illumination area being impinged by transmissions of the radar altimeter, dithering the radar gate viewing area within the antenna illumination area being impinged by transmissions of the radar altimeter, and taking radar return samples with the radar altimeter.
摘要翻译： 描述了用于抑制雷达高度计中的地面回波雷达衰落的方法。 该方法包括提供对应于小于被雷达高度计的传输所照射的天线照明区域的区域的雷达门宽度，使由雷达高度计的发射所照射的天线照明区域内的雷达门视野区域抖动， 并用雷达高度计拍摄雷达回波样本。
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公开(公告)号：US5477226A
公开(公告)日：1995-12-19
申请号：US239652
申请日：1994-05-09
CPC分类号： G01S13/34 , G01S13/882
摘要： A low cost frequency modulated (FM) radar altimeter system with enhanced accuracy for continuously providing an altitude of a target, comprising a transmitter means for transmitting a carrier modulated output signal towards the target; a receiver means having an altitude output signal for receiving the carrier modulated output signal reflected from the target after a time delay, and for providing an open loop error correction means for correcting errors resulting from nonlinearities in the transmitter means and signal processing delay variations in the receiver means so that the altitude determined is accurate; a coupling means for directing a portion of the carrier modulated output signal to the receiver means, and searching means having a first output directed to the receiver means and a second output directed to the transmitter means and having a symmetrical search output signal with a slope, s.sub.s, and a fixed period for providing continuous and repeated sweeping from a low altitude to a high altitude, an upsweep, and then back down to the low altitude, a downsweep, so that the radar altimeter is in a constant searching mode, and for automatically altering a search rate of the radar altimeter with changes in the slope, s.sub.s, of the search output signal so that the sensitivity of the radar altimeter increases as the slope, s.sub.s, decreases.
摘要翻译： 一种具有增强精度的低成本调频（FM）雷达高度计系统，用于连续地提供目标的高度，包括用于向目标发送载波调制输出信号的发射机装置; 接收机装置具有用于在时间延迟之后接收从目标反射的载波调制输出信号的高度输出信号，并且用于提供开环纠错装置，用于校正由发射机装置中的非线性引起的误差和信号处理延迟变化 接收机意味着所确定的高度是准确的; 用于将载波调制输出信号的一部分引导到接收机装置的耦合装置，以及搜索装置，其具有指向接收机装置的第一输出和指向发射机装置的第二输出，并具有具有斜率的对称搜索输出信号， ss和一个固定的时间段，用于从低空连续重复扫地到高空，仰卧起伏，然后回到低空，下降，使得雷达高度计处于恒定的搜索模式，并且 随着搜索输出信号的斜率ss的变化自动改变雷达高度计的搜索速率，使得雷达高度计的灵敏度随着斜率ss的减小而增加。
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7.发明授权Systems and methods for controlling a landing position of sensors deployed from an air vehicle 有权用于控制从机动车部署的传感器的着陆位置的系统和方法公开(公告)号：US07280917B2
公开(公告)日：2007-10-09
申请号：US10989879
申请日：2004-11-16
申请人： James R. Hager , Steven H. Thomas
发明人： James R. Hager , Steven H. Thomas
CPC分类号： G01C21/16 , G01P13/025
摘要： A sensing device is described that is configured to be launched from an air vehicle for deployment on the ground. The sensing device includes at least one sensor, an inertial measurement unit (IMU), at least one flight control surface, a flight control unit configured to control a position of the flight control surfaces, and a processing unit. The processing unit is coupled to the IMU and is configured to receive a desired trajectory from an external source and, upon launch of the sensing device, is further configured to determine an error between the desired trajectory and a current position as determined by the IMU. The processing unit is also configured to cause the flight control unit to adjust a position of the flight control surfaces to minimize the error.
摘要翻译： 描述了一种被配置为从空中车辆发射以在地面上展开的感测装置。 感测装置包括至少一个传感器，惯性测量单元（IMU），至少一个飞行控制表面，配置成控制飞行控制表面的位置的飞行控制单元和处理单元。 处理单元耦合到IMU并且被配置为从外部源接收期望的轨迹，并且在启动感测装置时，还被配置为确定由IMU确定的期望轨迹和当前位置之间的误差。 处理单元还被配置为使飞行控制单元调整飞行控制表面的位置以使误差最小化。
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公开(公告)号：US06753806B1
公开(公告)日：2004-06-22
申请号：US10459138
申请日：2003-06-11
IPC分类号： G01S740
CPC分类号： G01S13/53 , G01S7/288 , G01S7/292 , G01S13/882
摘要： A method for simulating a Doppler signal under stationary conditions is described. The method includes sampling a radar return signal at an integer multiple of the return signal frequency plus a fraction of the return signal period and generating a base band signal from the samples.
摘要翻译： 描述了在静止条件下模拟多普勒信号的方法。 该方法包括以返回信号频率的整数倍加上返回信号周期的一部分对雷达返回信号进行采样，并从样本产生基带信号。
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公开(公告)号：US07185538B2
公开(公告)日：2007-03-06
申请号：US10987811
申请日：2004-11-12
申请人： James R. Hager , Steven H. Thomas
发明人： James R. Hager , Steven H. Thomas
IPC分类号： G01F15/08
CPC分类号： G01F1/696 , G01F1/692 , G01P5/12 , G01P13/025
摘要： A system for determining airspeed of an air vehicle is described which includes and airflow sensor and a processor. The airflow sensor is located within an airflow path extending substantially through the air vehicle, and the processor is configured to receive a signal relating to an airflow rate from the airflow sensor and output an airspeed based on the received signal.
摘要翻译： 描述了一种用于确定空中交通工具的空速的系统，其包括气流传感器和处理器。 气流传感器位于基本上延伸穿过空气车辆的气流通道内，并且处理器被配置为接收与来自气流传感器的气流速率相关的信号，并基于接收到的信号输出空速。
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公开(公告)号：US06980153B2
公开(公告)日：2005-12-27
申请号：US10847510
申请日：2004-05-17
CPC分类号： G01S13/953 , G01C5/00 , G01S13/18 , G01S13/882 , Y02A90/18
摘要： A radar altimeter for vehicles that operate with a load suspended underneath is described. The radar altimeter includes a transmitter configured to transmit radar signals toward the ground, a receiver configured to receive reflected radar signals from the ground and from the suspended load, and at least one altitude processing channel configured to receive signals from the receiver. The radar altimeter also includes a load profile channel configured to receive signals from the receiver. The load profile channel limits an altitude processing sensitivity of the radar altimeter between the radar altimeter and the suspended load to reduce a likelihood that the radar altimeter will process signals reflected by the suspended load.
摘要翻译： 描述了用于悬挂在下面的负载操作的车辆的雷达高度计。 所述雷达高度计包括被配置为将雷达信号发射到地面的发射机，被配置为从所述地面和所述悬挂载荷接收反射的雷达信号的接收机以及被配置为从所述接收机接收信号的至少一个高度处理信道。 雷达高度计还包括配置为从接收机接收信号的负载分布信道。 负载曲线通道限制雷达高度计与悬挂负载之间的雷达高度计的高度处理灵敏度，以降低雷达高度计将处理由悬挂载荷反射的信号的可能性。
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