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1. 发明授权

US10838071B1 Reducing user multipath error and acquisition time in satellite navigation receivers 有权
公开(公告)号：US10838071B1
公开(公告)日：2020-11-17
申请号：US16712000
申请日：2019-12-12
申请人： The Aerospace Corporation
发明人： Robert B. Dybdal
IPC分类号： G01S19/22 , G01S19/30 , G01S19/29
CPC分类号： G01S19/22 , G01S19/29 , G01S19/30
摘要： Satellite navigation receivers are provided herein. In certain embodiments, a satellite navigation receiver correlates a received RF navigational signal from a satellite with a replica code generated by the receiver. Additionally, errors due to multipath are mitigated by identifying the location of the peak values of the correlation function obtained when the replica code is aligned with the received RF navigational signal. Thus, the peak correlation value is detected by sweeping the user replica code in delay in place of a closed loop early/late discriminator. Moreover, multiple copies of the receiver generated replica codes with different time offsets can be used to perform the acquisition in parallel. This advantageously reduces the amount of acquisition time to align the replica code and provides averaging to improve the accuracy in detecting the delay location of the peak correlation value.

2. 发明授权

US09628122B1 Circuits and methods for reducing interference that spectrally overlaps a desired signal based on dynamic gain control and/or equalization 有权
公开(公告)号：US09628122B1
公开(公告)日：2017-04-18
申请号：US15219079
申请日：2016-07-25
申请人： The Aerospace Corporation
发明人： Christopher J. Clark , Robert B. Dybdal , Fei Wang
IPC分类号： H04L27/08 , H04B1/10 , H04B1/04 , H04L27/26
CPC分类号： H04B1/10 , H03F1/32 , H03F3/24 , H04B1/0475 , H04B2001/0416 , H04J11/0066
摘要： A system is provided with circuits and methods for dynamically reducing interference to maintain linear system operation and mitigate interference degradation to desired signal components. The system can include a binning subcircuit system configured to divide the digitized input signal into a plurality of spectral bins each having a power level. A power analysis subcircuit can be coupled to the binning subcircuit and configured to compare a collective power level of spectral bins to a threshold level that would produce nonlinear system operation. Based upon the collective power level exceeding the threshold level, outputting a gain control signal to a variable gain amplifier so that the system remains linear. This dynamic gain control can be applied to systems that receive and/or transmit signals. Residual interference components that degrade signal components can be dynamically removed by excision and the distortion introduced by the excision process can be reduced with equalization circuitry.

3. 发明申请

US20220173818A1 INTERFERENCE MONITORING IN RADIO COMMUNICATION SYSTEMS 有权
公开(公告)号：US20220173818A1
公开(公告)日：2022-06-02
申请号：US16736099
申请日：2020-01-07
申请人： The Aerospace Corporation
发明人： Robert B. Dybdal , Catherine A. Allen , Lamont Cooper, JR.
IPC分类号： H04B17/345
摘要： Apparatus and methods for monitoring interference in radio communication systems are provided. In certain embodiments, an interference monitor system for a ground terminal detects for interference based on a sum of the power levels of orthogonal polarizations of detected interference, thereby allowing the total and average peak interference power levels to be obtained independent of interference polarization. Further, the interference can be divided into frequency bins over the received signal bandwidth(s), thereby facilitating measurement of interference spectral characteristics. Multiple interference monitors can be included to detect interference over the full angular range over which potential interference has access as well as to determine an angular direction of the interference.

4. 发明授权

US08804808B1 Dynamic equalization systems and methods for use with a receiver for a multipath channel 有权
标题翻译：用于多径信道的接收机的动态均衡系统和方法
公开(公告)号：US08804808B1
公开(公告)日：2014-08-12
申请号：US14154968
申请日：2014-01-14
申请人： The Aerospace Corporation
发明人： Robert B. Dybdal , Christopher J. Clark , Flavio Lorenzelli
IPC分类号： H04L27/01
CPC分类号： H04L27/01 , H04L25/03019 , H04L27/206 , H04L2025/03522 , H04L2027/0038 , H04L2027/0055 , H04L2027/0095
摘要： A dynamic equalization system and method for use with a receiver is provided. The receiver may include an antenna for receiving a signal having multipath signal components and a digitizer for obtaining and digitizing the received signal and multipath signal components. The digitized signal segment and multipath signal components may be discretized into signal segments of length n. Channel parameters of each of the discrete signal segments may be analyzed and locked to, and a time-domain representation of the analyzed channel parameters may be output. Each time-domain representation may be Fourier transformed into a frequency-domain representation, based upon which equalization parameters to equalize the multipath signal components for each of the analyzed channel parameters may be determined. The equalization parameters may be applied to corresponding signal segments of the digitized signal and multipath signal components so as to equalize the multipath signal components.
摘要翻译：提供了一种用于接收机的动态均衡系统和方法。接收机可以包括用于接收具有多路径信号分量的信号的天线和用于获得和数字化接收的信号和多径信号分量的数字化仪。数字化信号段和多径信号分量可以离散成长度为n的信号段。可以分析和锁定每个离散信号段的信道参数，并且可以输出所分析的信道参数的时域表示。可以基于哪些均衡参数来均衡每个分析的信道参数的多路径信号分量，可以将每个时域表示傅里叶变换成频域表示。均衡参数可以应用于数字化信号和多径信号分量的相应信号段，以便均衡多径信号分量。

5. 发明授权

US10056675B1 Systems and methods for reducing directional interference based on adaptive excision and beam repositioning 有权
公开(公告)号：US10056675B1
公开(公告)日：2018-08-21
申请号：US15674351
申请日：2017-08-10
申请人： The Aerospace Corporation
发明人： Robert B. Dybdal
IPC分类号： H01Q1/12 , H01Q25/02 , H01Q3/02 , H04B1/10
CPC分类号： H01Q1/1257 , H01Q3/02 , H01Q25/02 , H04B1/1036
摘要： Systems and methods are provided for repositioning a directional antenna that responds to a desired signal and directional interference. The antenna can generate a sum beam and first and second difference beams. Respective powers of the sum beam and the first and second difference beams can be determined. At least a portion of any of the directional interference can be excised from the sum beam and the first and second difference beams. Measures of the directional interference can be determined in the sum beam and the first and second difference beams. A first correlation between the sum beam and the first and second difference beams can be generated. Additional correlations between a signal identifier and the sum beam and first and second beams monitor the desired signal reception. The antenna can be repositioned away from the directional interference based on the powers, the measures, and the first correlation.

6. 发明授权

US11349581B1 Interference monitoring in radio communication systems 有权
公开(公告)号：US11349581B1
公开(公告)日：2022-05-31
申请号：US16736099
申请日：2020-01-07
申请人： The Aerospace Corporation
发明人： Robert B. Dybdal , Catherine A. Allen , Lamont Cooper, Jr.
IPC分类号： H01Q21/06 , H01Q21/24 , H04B1/10 , H04B7/10 , H04B17/345
摘要： Apparatus and methods for monitoring interference in radio communication systems are provided. In certain embodiments, an interference monitor system for a ground terminal detects for interference based on a sum of the power levels of orthogonal polarizations of detected interference, thereby allowing the total and average peak interference power levels to be obtained independent of interference polarization. Further, the interference can be divided into frequency bins over the received signal bandwidth(s), thereby facilitating measurement of interference spectral characteristics. Multiple interference monitors can be included to detect interference over the full angular range over which potential interference has access as well as to determine an angular direction of the interference.

7. 发明授权

US09806747B1 Circuits and methods for reducing interference that spectrally overlaps a desired signal based on dynamic gain control and/or equalization 有权
公开(公告)号：US09806747B1
公开(公告)日：2017-10-31
申请号：US15457895
申请日：2017-03-13
申请人： The Aerospace Corporation
发明人： Christopher J. Clark , Robert B. Dybdal , Fei Wang
IPC分类号： H04L27/06 , H04B1/10 , H04B1/04 , H04L27/26
CPC分类号： H04B1/10 , H03F1/32 , H03F3/24 , H04B1/0475 , H04B2001/0416 , H04J11/0066
摘要： A system is provided with circuits and methods for dynamically reducing interference to maintain linear system operation and mitigate interference degradation to desired signal components. The system can include a binning subcircuit system configured to divide the digitized input signal into a plurality of spectral bins each having a power level. A power analysis subcircuit can be coupled to the binning subcircuit and configured to compare a collective power level of spectral bins to a threshold level that would produce nonlinear system operation. Based upon the collective power level exceeding the threshold level, outputting a gain control signal to a variable gain amplifier so that the system remains linear. This dynamic gain control can be applied to systems that receive and/or transmit signals. Residual interference components that degrade signal components can be dynamically removed by excision and the distortion introduced by the excision process can be reduced with equalization circuitry.

8. 发明授权

US09065521B1 Systems and methods for reducing narrow bandwidth and directional interference contained in broad bandwidth signals 有权
标题翻译：用于减少宽带宽信号中包含的窄带宽和定向干扰的系统和方法
公开(公告)号：US09065521B1
公开(公告)日：2015-06-23
申请号：US14453949
申请日：2014-08-07
申请人： The Aerospace Corporation
发明人： Robert B. Dybdal , Christopher J. Clark , Don J. Hinshilwood , Lan Xu
IPC分类号： H03D1/04 , H04B1/10
CPC分类号： H04B1/10 , H04B1/1036 , H04B15/00 , H04J11/0066
摘要： Under one aspect, a system includes circuitry that digitizes and Fourier transforms first and second beams and outputs first and second sets of spectral bins. Each bin may include a portion of a group of signals or interference. The circuitry compares the collective power levels of each set of spectral bins to a predetermined threshold, and excises at least one bin of that set that contains the interference if the collective power level of that set exceeds the predetermined threshold. The circuitry determines an angular location of the interference based on excised bins, combines remaining bins with weights selected to form a null in a pattern of the first and second beams that is aligned with the interference's angular location, and inversely Fourier transforms the combined remaining bins and outputs the group of signals less any interference that was excised or excluded by the null.
摘要翻译：在一个方面，一种系统包括对第一和第二波束进行数字化和傅里叶变换并输出第一和第二组频谱仓的电路。每个箱可以包括一组信号或干扰的一部分。电路将每组频谱仓的集体功率电平与预定阈值进行比较，如果该组的总功率电平超过预定阈值，则将该集合的至少一个包含干扰的一个二进制位进行消除。电路基于切除的箱确定干扰的角位置，将剩余箱与组合剩余的重量组合，以便与干扰的角位置对准的第一和第二梁的图案中形成零，并将组合的剩余箱并输出该组信号减去由空值切除或排除的任何干扰。

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