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1.
公开(公告)号:US20240019581A1
公开(公告)日:2024-01-18
申请号:US18122531
申请日:2023-03-16
发明人: Angelo J. Joseph , Robert J. Frank
CPC分类号: G01S19/215 , G05D1/042
摘要: A local area detection and alerting system (LDAS) for detecting potential GNSS spoofing within a protected airspace includes a ground-based control station and several RF interference (RFI) control stations spaced to define the protected airspace. Each RFI control station includes two or more reference GNSS signal receivers in communication with two or more reception (Rx) antennas, each antenna having a surveyed true location and distinct height. The reference receivers continually determine GNSS-derived absolute positions of each antenna, which are compared to their true locations to determine if GNSS spoofing is responsible for measurement anomalies. Any detection of potential spoofing is forwarded to the control station, which broadcasts regular LDAS updates indicating the presence or absence of potential spoofing to all aircraft operating within a transmission range surrounding the protected airspace.
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公开(公告)号:US20180337722A1
公开(公告)日:2018-11-22
申请号:US15600497
申请日:2017-05-19
CPC分类号: H04B7/18513 , H01Q1/288 , H01Q3/00 , H01Q3/26 , H01Q3/36 , H01Q15/242 , H01Q21/061 , H01Q21/22 , H01Q21/24 , H01Q21/245 , H01Q25/00 , H04B7/18508 , H04B7/18515 , H04B7/1858 , H04B7/2041
摘要: Systems and methods disclose a satellite communication system including a plurality of antenna elements, an interface circuit, and a transceiver circuit. Each antenna element communicates a first polarization signal and a second polarization signal. The interface circuit receives, amplifies, and splits the first polarization signals into a first polarization primary signal and a first polarization secondary signal. The interface circuit also receives, amplifies, and splits the second polarization signals into a second polarization primary signal and a second polarization secondary signal. A first summer circuit generates a first beam signal via a sum of the first and second polarization primary signals. A second summer circuit generates a second beam signal via a sum of the first and second polarization secondary signals. The transceiver includes a first splitter circuit that receives and splits the first beam signal into a first signal and a second signal, a second splitter circuit that receives and splits the second beam signal into a third signal and a fourth signal, a first beamformer that synthesizes a first beamformed signal, and a second beamformer that synthesizes a second beamformed signal.
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公开(公告)号:US10205511B2
公开(公告)日:2019-02-12
申请号:US15600497
申请日:2017-05-19
摘要: Systems and methods disclose a satellite communication system including a plurality of antenna elements, an interface circuit, and a transceiver circuit. Each antenna element communicates a first polarization signal and a second polarization signal. The interface circuit receives, amplifies, and splits the first polarization signals into a first polarization primary signal and a first polarization secondary signal. The interface circuit also receives, amplifies, and splits the second polarization signals into a second polarization primary signal and a second polarization secondary signal. A first summer circuit generates a first beam signal via a sum of the first and second polarization primary signals. A second summer circuit generates a second beam signal via a sum of the first and second polarization secondary signals. The transceiver includes a first splitter circuit that receives and splits the first beam signal into a first signal and a second signal, a second splitter circuit that receives and splits the second beam signal into a third signal and a fourth signal, a first beamformer that synthesizes a first beamformed signal, and a second beamformer that synthesizes a second beamformed signal.
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