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公开(公告)号：US12009953B1
公开(公告)日：2024-06-11
申请号：US18408621
申请日：2024-01-10
发明人： Zhongli Yi , Shanshan Wang , Weichang Wang , Shengli Liu , Fuzhai Wang , Xinrui Zheng , Xuege Yang
CPC分类号： H04L27/0014 , H04L27/06 , H04L27/12 , H04L2027/0026
摘要： A method for processing an automatic identification system (AIS) baseband signal based on a field-programmable gate array (FPGA) is provided. A signal output by a bus is cached in a message buffer and then sent to a Gaussian filtered minimum shift keying (GMSK) modulator after being encoded by a frame encoder. Another signal output by the bus is processed by an AIS access control module and then also sent to the GMSK modulator. The two signals output by the bus are respectively output to two digital to analog converters (DACs) after being modulated by the GMSK modulator; a digital signal is converted into an analog signal, and the analog signal is sent to an I/Q or two-point modulation radio frequency (RF) circuit. Two received baseband signals are respectively input into analog to digital converters (ADCs) and separately sent to the bus.
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2.发明授权公开(公告)号：US11818594B2
公开(公告)日：2023-11-14
申请号：US17244016
申请日：2021-04-29
发明人： Zhongli Yi , Chen Kong , Shanshan Wang , Xuedong Mou , Huabao Chen , Shengbo Qin , Shengli Liu , Fuzhai Wang , Yanjun Fang , Chen Wang , Rui Miao
摘要： The present application provides a method for testing the coverage effect of a VHF communication base station, including: a server sending preset test parameter information to a mobile station, sending a first start test instruction to the mobile station and at least one base station, and receiving first audio data and first location information sent by the at least one base station, and second audio data and second location information sent by the mobile station. By using the mobile stations to send or receive audio data at different distances to a temporary VHF communication base station, it is possible to accurately determine a coverage distance of the temporary VHF communication base station and a transmission effect of the audio data at different communication distances.
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