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公开(公告)号：US11681009B1
公开(公告)日：2023-06-20
申请号：US17437287
申请日：2021-01-13
CPC分类号： G01S5/0218 , G01S5/0226 , G01S5/10
摘要： Method of reducing multipath effects on phase measurements, including receiving radio signals with different pseudo-random codes transmitted by at least four base stations, each at particular frequency received by one channel; measuring delay difference and phase difference from different pairs of base stations; calculating a current position of the receiver based on the measured phase differences and delay differences, wherein the base stations differ in pseudo-random codes at same frequencies or differ in carrier frequency or polarization type if using the same pseudo-random codes, and wherein a number of channels in the receiver exceeds a number of channels needed for the calculating of the current position; detecting anomalous jumps in phase of one or more channels, based on first or second derivative of the phase, as being indicative of multipath signal reception; removing those channels from calculation of current position; and calculating current position based on remaining channels.
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公开(公告)号：US11287532B2
公开(公告)日：2022-03-29
申请号：US16343899
申请日：2018-11-13
发明人： Nikolay Nikolaevich Vasilyuk , Andrey Vladimirovich Veitsel , Sergey Ivanovich Tychinskiy , Alexandr Vladimirovich Doronin , Alexey Stanislavovich Lebedinsky , Konstantin Viktorovich Ebauer
摘要： GNSS timing receiver with synchronization of raw GNSS measurements to an external timescale. Synchronization is achieved by using a hardware Time Interval Measurement Unit (TIMU). The TIMU measures time intervals between two pulse signals and makes additional processing of these measurements. The first pulse signal is generated inside the GNSS receiver. The second pulse signal is the external pulse signal generated by an external time reference device. This time interval is used to control the time instant when the output GNSS measurement will be taken. In the first embodiment all actual GNSS measurements are physically taken at time instants indicated by external pulse signal. These measurements are used as output GNSS measurements. In another embodiment all actual GNSS measurements are taken at their default time instants indicated by internal pulse signal. But output GNSS measurements are calculated at the time instants indicated by the external pulse signal.
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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
CPC分类号： G01S19/30 , G01S19/243 , G01S19/37 , H04B1/709
摘要： 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：US11604285B2
公开(公告)日：2023-03-14
申请号：US17282398
申请日：2020-04-22
摘要： 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：US11125889B2
公开(公告)日：2021-09-21
申请号：US16557870
申请日：2019-08-30
发明人： Vladimir Victorovich Veitsel , Andrey Vladimirovich Veitsel , Konstantin Vladimirovich Chereshnev
IPC分类号： G01S19/30 , G01S19/23 , H04B1/7073 , H04B1/7085 , H04B1/7075
摘要： The present invention discloses methods of accuracy improving for code measurements in GLONASS GNSS receivers. One component of error budget in code measurements of GLONASS receivers is caused by a difference in signal delays arising in the receiver analog Front End and antenna filter on different channel frequencies specific to GLONASS satellites. Methods to compensate for differences in delays for different GLONASS channel frequencies have been proposed using data collected from a GLONASS signals simulator.
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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
发明人： Andrey Vladimirovich Veitsel , Leonid Victorovich Purto , Alexey Stanislavovich Lebedinsky , Dmitry Anatolievich Rubtsov
摘要： 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：US10027430B1
公开(公告)日：2018-07-17
申请号：US15549459
申请日：2017-04-18
发明人： Nikolay Afanasievich Vazhenin , Andrey Vladimirovich Veitsel , Vladimir Victorovich Veitsel , Fedor Borisovich Serkin
IPC分类号： H04B1/10 , H04B17/336 , H04B1/12
摘要： An apparatus to measure signal-to-thermal noise ratio (SNR) and signal-to-pulse noise ratio (SPNR), the apparatus including a quadrature mixer, a pulse noise reduction unit, an SNR estimation unit and an offset compensation unit, connected in series, the quadrature mixer receiving the input radio signal and outputting an in-phase component and a quadrature component; a pulse noise separation unit, and an SPNR estimation unit connected series, the pulse noise reduction unit and the pulse noise separation unit inputting the in-phase and quadrature components; the SPNR estimation unit inputting a filtered in-phase component from the pulse noise reduction unit. The offset compensation unit outputs a current SNR. The SPNR estimation unit outputs a current SPNR. The pulse noise separation unit includes a first LPF, an impulse noise separator and an HPF, connected in series; and a second LPF, a pulse noise detection unit and an inverter, connected in series.
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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
IPC分类号： H04L27/148 , H04L27/00
CPC分类号： H04L27/148 , H04L2027/0067
摘要： 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：US11035960B1
公开(公告)日：2021-06-15
申请号：US16088957
申请日：2018-03-22
发明人： Nikolay Afanasievich Vazhenin , Andrey Vladimirovich Veitsel , Vladimir Victorovich Veitsel , Igor Anatolievich Orlovsky , Leonid Victorovich Purto , Dmitry Anatolyevich Rubtsov , Fedor Borisovich Serkin
摘要： 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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公开(公告)号：US20190219708A1
公开(公告)日：2019-07-18
申请号：US16365275
申请日：2019-03-26
IPC分类号： G01S19/33
摘要： A method for receiving and processing satellite navigation signals includes receiving the navigation signals; converting the navigation signals into digital signals; providing a clock signal to all channels that process the digital signals; generating frequency division signals; selecting a channel frequency division signal from the frequency division signals based on which ADC is used to convert the satellite navigation signals into digital signals; connecting the channel to the ADC; generating code frequency signal and base carrier frequency signal using a net accumulation signal; processing the digital signal in the channel to produce digital quadrature signal components of the digital signal based on the code frequency signal and the base carrier frequency signal; using a tick signal that represents 2N×clock signal as a temporary time scale for control of the channels for determining digital signal phase differences between the channels; and outputting coordinates based on the quadrature components.
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