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1. 发明申请

US20090303104A1 PSEUDO-RANDOM PULSE INTERVAL GENERATION IN NAVIGATION-AIDING DEVICES 失效
标题翻译：导航辅助设备中的PSEUDO随机脉冲间隔生成
公开(公告)号：US20090303104A1
公开(公告)日：2009-12-10
申请号：US12133238
申请日：2008-06-04
申请人： Mark S. Shoemaker , Peter Peterson , Curtis J. Petrich
发明人： Mark S. Shoemaker , Peter Peterson , Curtis J. Petrich
IPC分类号： G01S13/08 , G01S13/16
CPC分类号： G01S13/882 , G01S13/222 , G01S13/87
摘要： An electronic circuit comprises a randomizing bit generator configured to generate a randomizing bit sequence based on a sequence selection input signal. The randomizing bit generator includes a counter operable to provide an individual starting count for the randomizing bit sequence and a parity generator responsive to an output of the counter. The circuit further comprises a pseudo-random number generator responsive to the randomizing bit generator. The pseudo-random number generator is operable to provide at least one pulsed signal based at least in part on the random bit sequence. The electronic circuit is operable to substantially eliminate interference in a series of pulsed signal transmissions comprising the at least one pulsed signal from each of two or more navigation devices, where each of the pulsed signals from each of the navigation devices is separated by an automatically adjustable time interval.
摘要翻译：电子电路包括被配置为基于序列选择输入信号生成随机化位序列的随机化位发生器。随机化位发生器包括一个可操作的计数器，用于为随机化位序列提供一个单独的起始计数，并响应于计数器的输出提供奇偶校验发生器。电路还包括响应于随机化位发生器的伪随机数发生器。伪随机数发生器可操作以至少部分地基于随机比特序列提供至少一个脉冲信号。电子电路可操作以基本上消除一系列脉冲信号传输中的干扰，其包括来自两个或更多个导航装置中的每一个的至少一个脉冲信号，其中来自每个导航装置的每个脉冲信号被自动调节时间间隔。

2. 发明授权

US06674397B2 Methods and apparatus for minimum computation phase demodulation 有权
标题翻译：用于最小计算相位解调的方法和装置
公开(公告)号：US06674397B2
公开(公告)日：2004-01-06
申请号：US10144871
申请日：2002-05-13
申请人： James R. Hager , Lavell Jordan , Todd R. Burlet , Curtis J. Petrich
发明人： James R. Hager , Lavell Jordan , Todd R. Burlet , Curtis J. Petrich
IPC分类号： G01S1353
CPC分类号： G01S7/292 , G01S3/48 , G01S13/18 , G01S13/20 , G01S13/288 , G01S13/42 , G01S13/524 , G01S13/70 , G01S13/882 , G01S13/94
摘要： A filter, includes a first order band pass filter configured to process non-zero amplitude gated radar return samples and process a portion of received zero amplitude return samples. The filter also calculates past filter outputs based on filter outputs generated during previous non-zero gated radar return samples.
摘要翻译：滤波器包括被配置为处理非零幅度门控雷达返回样本并且处理接收的零幅度返回样本的一部分的第一阶带通滤波器。滤波器还可以根据先前非零门控雷达返回样本中生成的滤波器输出来计算过去的滤波器输出。

3. 发明授权

US06407697B1 Low probability of intercept coherent radar altimeter 失效
标题翻译：拦截相干雷达高度计的概率较低
公开(公告)号：US06407697B1
公开(公告)日：2002-06-18
申请号：US09594653
申请日：2000-06-15
申请人： James R. Hager , Curtis J. Petrich , John H. Keuper
发明人： James R. Hager , Curtis J. Petrich , John H. Keuper
IPC分类号： G01S1308
CPC分类号： G01S7/4004 , G01S7/032 , G01S7/4008 , G01S13/26 , G01S13/882 , G01S2013/0281
摘要： A radar altimeter for determining altitude of an air vehicle with respect to ground comprises a digital sequencer for digitally modulating a first signal. A transmitter coupled to the digital sequencer transmits a radar signal including the modulated first signal toward the ground. A receiver receives a reflected radar signal from the ground. The received radar signal includes the modulated first signal. A digitizer coupled to the receiver generates digital samples of the modulated first signal. A digital signal processor coupled to the digitizer receives digital samples of the modulated first signal from the digitizer, demodulates the received digital samples, processes the demodulated digital samples and outputs altitude data based on the demodulated digital samples.
摘要翻译：用于确定空中交通工具相对于地面的高度的雷达高度计包括用于数字调制第一信号的数字定序器。耦合到数字定序器的发射器将包括经调制的第一信号的雷达信号发射到地面。接收机从地面接收反射的雷达信号。所接收的雷达信号包括经调制的第一信号。耦合到接收器的数字转换器产生调制的第一信号的数字样本。耦合到数字转换器的数字信号处理器从数字转换器接收经调制的第一信号的数字采样，解调所接收的数字采样，处理解调的数字采样并基于解调的数字样本输出高度数据。

4. 发明授权

US06362776B1 Precision radar altimeter with terrain feature coordinate location capability 有权
标题翻译：精密雷达测高仪具有地形特征坐标定位能力
公开(公告)号：US06362776B1
公开(公告)日：2002-03-26
申请号：US09498930
申请日：2000-02-04
申请人： James R. Hager , Curtis J. Petrich , Larry D. Almsted
发明人： James R. Hager , Curtis J. Petrich , Larry D. Almsted
IPC分类号： G01S1308
CPC分类号： G01S13/882 , G01S7/292 , G01S13/18 , G01S13/46 , G01S13/524 , G01S13/94
摘要： A radar altimeter for determining altitude of an air vehicle comprises a transmitter for transmitting radar signals toward the ground. A first and a second antenna receive reflected radar signals from the ground. A signal processor is coupled to the first and the second antennas. The signal processor includes filter means for rejecting signals other than signals reflected from a selected ground swath. The signal processor determines the above ground level altitude of the air vehicle based on the radar signals output from the filter means. A phase ambiguity resolution means resolves phase ambiguities that arise due to multiple wavelength separation of the first and the second antenna. The signal processor also determines the horizontal position of the highest point in the selected ground swath. In a preferred embodiment, the phase ambiguity resolution means comprises a third antenna spaced closely to the first antenna such that there are no phase ambiguities between the reflected radar signals received by the third antenna and the first antenna.
摘要翻译：用于确定空中交通工具的高度的雷达高度计包括用于向地面发射雷达信号的发射机。第一和第二天线从地面接收反射的雷达信号。信号处理器耦合到第一和第二天线。信号处理器包括滤波器装置，用于拒绝除了从所选地线所反射的信号之外的信号。信号处理器基于从过滤装置输出的雷达信号确定空中交通工具的上述地面高度。相位歧义解决方案解决由于第一和第二天线的多波长分离而产生的相位模糊度。信号处理器还确定所选地线中最高点的水平位置。在优选实施例中，相位模糊度分辨装置包括与第一天线紧密相邻的第三天线，使得在由第三天线和第一天线接收的反射的雷达信号之间不存在相位模糊。

5. 发明授权

US07725220B2 Adaptive filtering for altimeters 有权
标题翻译：高度计的自适应滤波
公开(公告)号：US07725220B2
公开(公告)日：2010-05-25
申请号：US11466819
申请日：2006-08-24
申请人： Curtis J. Petrich , David V. Hansen
发明人： Curtis J. Petrich , David V. Hansen
IPC分类号： G01C23/00
CPC分类号： G01C23/00 , G01C5/005
摘要： A method of processing altitude measurements for an aircraft is disclosed. The method involves filtering raw altimeter data within an altimeter to substantially limit random variations in the altitude measurements for one or more altimeter measurement profiles.
摘要翻译：公开了一种处理飞机高度测量的方法。该方法涉及在高度计内过滤原始高度计数据，以基本上限制一个或多个高度计测量轮廓的高度测量值的随机变化。

6. 发明授权

US06894640B1 Methods and apparatus for conversion of radar return data 有权
标题翻译：用于转换雷达回波数据的方法和装置
公开(公告)号：US06894640B1
公开(公告)日：2005-05-17
申请号：US10657883
申请日：2003-09-09
申请人： James R. Hager , Jens M. Henrickson , Lavell Jordan , Curtis J. Petrich
发明人： James R. Hager , Jens M. Henrickson , Lavell Jordan , Curtis J. Petrich
IPC分类号： G01S7/285 , G01S3/48 , G01S7/292 , G01S13/18 , G01S13/20 , G01S13/28 , G01S13/42 , G01S13/50 , G01S13/524 , G01S13/70 , G01S13/88 , G01S13/94 , G01S13/08
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。

7. 发明授权

US07646333B2 Pseudo-random pulse interval generation in navigation-aiding devices 失效
标题翻译：导航辅助装置中的伪随机脉冲间隔生成
公开(公告)号：US07646333B2
公开(公告)日：2010-01-12
申请号：US12133238
申请日：2008-06-04
申请人： Mark S. Shoemaker , Peter Peterson , Curtis J. Petrich
发明人： Mark S. Shoemaker , Peter Peterson , Curtis J. Petrich
IPC分类号： G01S5/02 , G01S13/08 , H04J3/06
CPC分类号： G01S13/882 , G01S13/222 , G01S13/87
摘要： An electronic circuit comprises a randomizing bit generator configured to generate a randomizing bit sequence based on a sequence selection input signal. The randomizing bit generator includes a counter operable to provide an individual starting count for the randomizing bit sequence and a parity generator responsive to an output of the counter. The circuit further comprises a pseudo-random number generator responsive to the randomizing bit generator. The pseudo-random number generator is operable to provide at least one pulsed signal based at least in part on the random bit sequence. The electronic circuit is operable to substantially eliminate interference in a series of pulsed signal transmissions comprising the at least one pulsed signal from each of two or more navigation devices, where each of the pulsed signals from each of the navigation devices is separated by an automatically adjustable time interval.
摘要翻译：电子电路包括被配置为基于序列选择输入信号生成随机化位序列的随机化位发生器。随机化位发生器包括一个可操作的计数器，用于为随机化位序列提供一个单独的起始计数，并响应于计数器的输出提供奇偶校验发生器。电路还包括响应于随机化位发生器的伪随机数发生器。伪随机数发生器可操作以至少部分地基于随机比特序列提供至少一个脉冲信号。电子电路可操作以基本上消除一系列脉冲信号传输中的干扰，其包括来自两个或多个导航装置中的每一个的至少一个脉冲信号，其中每个导航装置的每个脉冲信号被自动调节时间间隔。

8. 发明授权

US07248208B2 Methods and systems for maintaining a position during hovering operations 有权
标题翻译：在悬停操作期间保持位置的方法和系统
公开(公告)号：US07248208B2
公开(公告)日：2007-07-24
申请号：US10865407
申请日：2004-06-10
申请人： James R. Hager , David V. Hansen , Curtis J. Petrich
发明人： James R. Hager , David V. Hansen , Curtis J. Petrich
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。

9. 发明授权

US06734820B2 Methods and apparatus for conversion of radar return data 有权
标题翻译：用于转换雷达回波数据的方法和装置
公开(公告)号：US06734820B2
公开(公告)日：2004-05-11
申请号：US10144744
申请日：2002-05-13
申请人： James R. Hager , Jens M. Henrickson , Lavell Jordan , Curtis J. Petrich
发明人： James R. Hager , Jens M. Henrickson , Lavell Jordan , Curtis J. Petrich
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。

10. 发明申请

US20080051948A1 ADAPTIVE FILTERING FOR ALTIMETERS 有权
标题翻译：自适应过滤器
公开(公告)号：US20080051948A1
公开(公告)日：2008-02-28
申请号：US11466819
申请日：2006-08-24
申请人： Curtis J. Petrich , David V. Hansen
发明人： Curtis J. Petrich , David V. Hansen
IPC分类号： G01C23/00
CPC分类号： G01C23/00 , G01C5/005
摘要： A method of processing altitude measurements for an aircraft is disclosed. The method involves filtering raw altimeter data within an altimeter to substantially limit random variations in the altitude measurements for one or more altimeter measurement profiles.
摘要翻译：公开了一种处理飞机高度测量的方法。该方法涉及在高度计内过滤原始高度计数据，以基本上限制一个或多个高度计测量轮廓的高度测量值的随机变化。

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