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公开(公告)号：US20230224198A1
公开(公告)日：2023-07-13
申请号：US17611742
申请日：2021-05-14
Applicant: Topcon Positioning Systems, Inc.
IPC: H04L27/148
CPC classification number: H04L27/148 , H04L2027/0067
Abstract: Method of demodulation of M-CPFSK signal, includes receiving the M-CPFSK radio signal; moving it to zero frequency; sampling at no less than double a frequency of symbols; storing the samples with their amplitude and phase for at least L4 symbols; demodulating the sampled signal in three stages, wherein each stage includes iterating over symbol values within a block of symbols, of length is L1, L2 and then L3; in the first stage, N1 symbol sequences out of all possible symbol sequences are iterated over, at the second stage, N2 symbol sequences out of all possible symbol sequences are iterated over, and at the third stage, N3 symbol sequences out of all possible symbol sequences are iterated over, to obtain final symbol values; symbol values obtained at previous stage is used in a next stage to reduce a number of symbol sequences; and determining encoded bits based on final symbol values.
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公开(公告)号：US12101208B2
公开(公告)日：2024-09-24
申请号：US18375748
申请日：2023-10-02
Applicant: Topcon Positioning Systems, Inc.
IPC: H04L27/148 , H04L27/00
CPC classification number: H04L27/148 , H04L2027/0067
Abstract: Method of demodulation of M-CPFSK signal, includes receiving the M-CPFSK radio signal; moving it to zero frequency; sampling at no less than double a frequency of symbols; storing the samples with their amplitude and phase for at least L4 symbols; demodulating the sampled signal in three stages, wherein each stage includes iterating over symbol values within a block of symbols, of length is L1, L2 and then L3; in the first stage, N1 symbol sequences out of all possible symbol sequences are iterated over, at the second stage, N2 symbol sequences out of all possible symbol sequences are iterated over, and at the third stage, N3 symbol sequences out of all possible symbol sequences are iterated over, to obtain final symbol values; symbol values obtained at previous stage is used in a next stage to reduce a number of symbol sequences; and determining encoded bits based on final symbol values.
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Patent Agency Ranking
公开(公告)号：US11942948B2
公开(公告)日：2024-03-26
申请号：US17758697
申请日：2021-10-08
Applicant: TOPCON POSITIONING SYSTEMS, INC.
CPC classification number: H03K3/84 , G01S1/0428 , G01S7/023 , G01S19/03 , G01S19/235 , H04B1/713 , H04B15/00 , H04L27/02
Abstract: An apparatus for forming wideband pseudo random noise signals includes a set of channels each comprising an NCO having a controlled frequency and phase and a PRN code generator, the NCO generating a strobe that is output to the PRN code generator. The PRN code generator forms a new sequence element of +1 or −1 in response to the strobe. The apparatus also comprises a first modulator having a plurality of weight coefficients, a plurality of multipliers each multiplying one of the weight coefficients, an adder outputting a sum of the plurality of multipliers output signals, and a mixer with a quadrature output signal multiplying the adder's output by sine and cosine of a low intermediate frequency. The apparatus also includes a processor controlling the set of channels, a transceiver module to receive and/or transmit quadrature signals, and an interface connecting the output of the mixer and the transceiver module.
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公开(公告)号：US20240048416A1
公开(公告)日：2024-02-08
申请号：US18375748
申请日：2023-10-02
Applicant: Topcon Positioning Systems, Inc.
IPC: H04L27/148
CPC classification number: H04L27/148 , H04L2027/0067
Abstract: Method of demodulation of M-CPFSK signal, includes receiving the M-CPFSK radio signal; moving it to zero frequency; sampling at no less than double a frequency of symbols; storing the samples with their amplitude and phase for at least L4 symbols; demodulating the sampled signal in three stages, wherein each stage includes iterating over symbol values within a block of symbols, of length is L1, L2 and then L3; in the first stage, N1 symbol sequences out of all possible symbol sequences are iterated over, at the second stage, N2 symbol sequences out of all possible symbol sequences are iterated over, and at the third stage, N3 symbol sequences out of all possible symbol sequences are iterated over, to obtain final symbol values; symbol values obtained at previous stage is used in a next stage to reduce a number of symbol sequences; and determining encoded bits based on final symbol values.
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公开(公告)号：US11804994B2
公开(公告)日：2023-10-31
申请号：US17611742
申请日：2021-05-14
Applicant: Topcon Positioning Systems, Inc.
IPC: H04L27/148 , H04L27/00
CPC classification number: H04L27/148 , H04L2027/0067
Abstract: Method of demodulation of M-CPFSK signal, includes receiving the M-CPFSK radio signal; moving it to zero frequency; sampling at no less than double a frequency of symbols; storing the samples with their amplitude and phase for at least L4 symbols; demodulating the sampled signal in three stages, wherein each stage includes iterating over symbol values within a block of symbols, of length is L1, L2 and then L3; in the first stage, N1 symbol sequences out of all possible symbol sequences are iterated over, at the second stage, N2 symbol sequences out of all possible symbol sequences are iterated over, and at the third stage, N3 symbol sequences out of all possible symbol sequences are iterated over, to obtain final symbol values; symbol values obtained at previous stage is used in a next stage to reduce a number of symbol sequences; and determining encoded bits based on final symbol values.
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公开(公告)号：US20210063583A1
公开(公告)日：2021-03-04
申请号：US17098224
申请日：2020-11-13
Applicant: Topcon Positioning Systems, Inc.
Inventor： Andrey Vladimirovich Veitsel , Dmitry Anatolyevich Rubtsov , Igor Anatolyevich Orlovsky , Sergey Sayarovich Bogoutdinov
Abstract: A universal multi-channel receiver for receiving and processing signals from different navigation systems is provided. The universal receiver is implemented as an ASIC receiver with a number of universal channels. The receiver with universal channels is capable of receiving and processing signals from navigation satellites located within a direct access zone. The universal receiver has a plurality of channels that share the same memory. The universal receiver can determine its coordinates using any of the existing navigation systems (GPS, GLONASS, Beidou and GALILEO). The receiver can receive and process any (PN) signals.
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公开(公告)号：US20190041530A1
公开(公告)日：2019-02-07
申请号：US16143629
申请日：2018-09-27
Applicant: Topcon Positioning Systems, Inc.
Inventor： Andrey Vladimirovich Veitsel , Dmitry Anatolyevich Rubtsov , Igor Anatolyevich Orlovsky , Sergey Sayarovich Bogoutdinov
IPC: G01S19/33
Abstract: A universal multi-channel receiver for receiving and processing signals from different navigation systems is provided. The universal receiver is implemented as an ASIC receiver with a number of universal channels. The receiver with universal channels is capable of receiving and processing signals from navigation satellites located within a direct access zone. The universal receiver has a plurality of channels that share the same memory. The universal receiver can determine its coordinates using any of the existing navigation systems (GPS, GLONASS, Beidou and GALILEO). The receiver can receive and process any (PN) signals.
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