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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：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：US11782168B2
公开(公告)日：2023-10-10
申请号：US18109503
申请日：2023-02-14
Applicant: Topcon Positioning Systems, Inc.
CPC classification number: G01S19/30 , G01S19/243 , G01S19/37 , H04B1/709
Abstract: A method of receiving two chip-by-chip multiplexed CSK signals (e.g., GNSS signals) and searching for a non-CSK signal with optimal performance at a given digit capacity of a sampling memory resided in parallel correlators. For CSK signals Prompt, Early and Late results for each of possible code shift are calculated as different sums of four punctured convolutions. Depending on configuration, the method allows to receive both multiplexed CSK signals with lesser quality or one of the CSK signals with better quality. The method can be implemented as an apparatus with four punctured correlators, a set of multipliers by 1 or 2N, another set of multipliers by 1 or 0, summers of four input to one result, a RAM, searchers of maximum, and conditional commutators.
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Patent Agency Ranking
公开(公告)号：US11604285B2
公开(公告)日：2023-03-14
申请号：US17282398
申请日：2020-04-22
Applicant: Topcon Positioning Systems, Inc.
Abstract: A method of receiving two chip-by-chip multiplexed CSK signals (e.g., GNSS signals) and searching for a non-CSK signal with optimal performance at a given digit capacity of a sampling memory resided in parallel correlators. For CSK signals Prompt, Early and Late results for each of possible code shift are calculated as different sums of four punctured convolutions. Depending on configuration, the method allows to receive both multiplexed CSK signals with lesser quality or one of the CSK signals with better quality. The method can be implemented as an apparatus with four punctured correlators, a set of multipliers by 1 or 2N, another set of multipliers by 1 or 0, summers of four input to one result, a RAM, searchers of maximum, and conditional commutators.
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公开(公告)号：US10921459B2
公开(公告)日：2021-02-16
申请号：US16677996
申请日：2019-11-08
Applicant: Topcon Positioning Systems, Inc.
Inventor： Andrey Vladimirovich Veitsel , Leonid Victorovich Purto , Alexey Stanislavovich Lebedinsky , Dmitry Anatolievich Rubtsov
Abstract: GNSS receiver includes first type correlators and a maximum selecting unit selecting an output from the first type correlators, and with a common control of all the correlators in code delay, carrier phase and carrier frequency; second type correlators with individual control in code delay of each correlator or each sub-group of second type correlators and with common control of all second type correlators in carrier phase and frequency; and a processor. The first type correlators can convolve one quadrature only, and demodulates CSK symbols, the second type correlators calculate discriminator values for CSK-modulated signal DLL, the demodulated data then is used by the processor to produce improved position and velocity.
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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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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：US11035960B1
公开(公告)日：2021-06-15
申请号：US16088957
申请日：2018-03-22
Applicant: Topcon Positioning Systems, Inc.
Inventor： Nikolay Afanasievich Vazhenin , Andrey Vladimirovich Veitsel , Vladimir Victorovich Veitsel , Igor Anatolievich Orlovsky , Leonid Victorovich Purto , Dmitry Anatolyevich Rubtsov , Fedor Borisovich Serkin
Abstract: Navigation receiver includes antennas receiving signals from different satellite constellations, Low Noise Amplifiers, a Block of Analog Filters, a Block of Quadrature mixers (BQM) translating in phase and quadrature signals to an intermediate frequency, analog converters digitizing the in phase and quadrature signals, a Block of Digital Quadrature Mixers (BDQM) shifting the digitized signals to zero frequency, a Set Block of Digital Filters (SBDF) band-pass filtering the shifted signals, and reducing a sampling rate, and a Block of Digital Processing (BDP) calculating coordinates, all series-connected; a Block of Digital Generators (BDG) for fine control of the BDQM; and a Block of Analog Generators (BAG) that defines which signal is processed by its corresponding BQM; SBDF including Blocks of Digital Filters (BDFs), each BDF including a chain of Blocks of MultiRate Filters for antialiasing filtering/down-sampling of shifted signals, programmable commutators for controlling decimation, and FIR-filters; each BDF controlled by control block.
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