公开(公告)号：US20160365935A1

公开(公告)日：2016-12-15

申请号：US15212237

申请日：2016-07-17

Applicant: Topcon Positioning Systems, Inc.

Inventor： NIKOLAY AFANASIEVICH VAZHENIN ,  ANDREY VLADIMIROVICH VEITSEL ,  FEDOR BORISOVICH SERKIN ,  VLADIMIR VICTOROVICH VEITSEL

IPC: H04B17/336 ,  H04B17/20

CPC classification number: H04B17/336 ,  H04B17/20

Abstract: A method of estimating current SNR in a sequence of symbols, including receiving a signal representing an additive mixture y(t)=s(t)+n(t) of a sequence of phase-modulated symbols with fixed length and phase modulation s(t) and including white Gaussian noise (AWGN) n(t); separating quadrature components IY and QY of the received signal in a quadrature mixer; determining a mean-square IY2 of IY; determining a mean-square QY2 of QY; determining a square/squared value of mean absolute value (modulus) |IY|2; determining a square of mean value for quadrature component ]QY[2, where values of the quadrature component QY are averaged taking into account a sign of a symbol received in a channel; determining a current absolute value (vector length) for √{square root over (Iy2+Qy2)}; determining the current SNR based on IY2, QY2, |IY|2, ]QY[2 and √{square root over (Iy2+Qy2)}; and compensating for a systematic error of the current SNR.

Abstract translation: 一种估计符号序列中的当前SNR的方法，包括接收表示具有固定长度和相位调制的相位调制符号序列的加性混合y（t）= s（t）+ n（t）的信号（ t），包括白高斯噪声（AWGN）n（t）; 在正交混频器中分离接收信号的正交分量IY和QY; 确定IY的均方IY2; 确定QY的均方QY2; 确定平均绝对值（模数）| IY | 2的平方/平方值; 确定正交分量平均值的平方值QY [2，其中正交分量QY的值被考虑到在信道中接收的符号的符号被平均化; 确定√{平方根超过（Iy2 + Qy2）}的当前绝对值（矢量长度）; 基于IY2，QY2，| IY | 2，] QY [2和√{平方根（Iy2 + Qy2）}确定当前SNR; 并补偿当前SNR的系统误差。

公开(公告)号：US20170207799A1

公开(公告)日：2017-07-20

申请号：US15475292

申请日：2017-03-31

Applicant: Topcon Positioning Systems, Inc.

Inventor： NIKOLAY AFANASIEVICH VAZHENIN ,  ANDREY VLADIMIROVICH VEITSEL ,  ALEXEY S. LEBEDINSKY ,  IVAN ANDREEVICH KIRJANOV

IPC: H03M13/11 ,  H03M13/37 ,  H04L1/00

CPC classification number: H03M13/1111 ,  H03M13/1128 ,  H03M13/3723 ,  H03M13/3746 ,  H03M13/458 ,  H04L1/005 ,  H04L1/0052 ,  H04L1/0057

Abstract: Method of identification and compensation for inversion of the input bit stream when decoding LDPC codes includes obtaining a code word of the LDPC code from a demodulator output and writing the code word into a buffer memory, decoding the code word, calculating a syndrome for each iteration when decoding, making an analysis of converging the weight of the syndrome, generating an inversion feature for the input bit stream based on this analysis, continuing the decoding, if the inversion feature for the input bit stream does not give evidence of detecting inversion, resetting, if the inversion feature for the input bit stream shows inversion, the LDPC decoder and analysis parameters for the convergence of the weight of the syndrome, reading next code word from the buffer memory, and producing an inversion of this code word, and feeding the word to the decoder input to implement the next decoding operation.

公开(公告)号：US20200072981A1

公开(公告)日：2020-03-05

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

IPC: G01S19/24 ,  G01S19/30 ,  G01S19/27

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.

公开(公告)号：US20190383947A1

公开(公告)日：2019-12-19

申请号：US16557870

申请日：2019-08-30

Applicant: Topcon Positioning Systems, Inc.

Inventor： VLADIMIR VICTOROVICH VEITSEL ,  ANDREY VLADIMIROVICH VEITSEL ,  KONSTANTIN VLADIMIROVICH CHERESHNEV

IPC: G01S19/23

Abstract: 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.

公开(公告)号：US20180239026A1

公开(公告)日：2018-08-23

申请号：US15549209

申请日：2016-11-16

Applicant: Topcon Positioning Systems, Inc.

Inventor： ANDREY VLADIMIROVICH VEITSEL ,  LEONID VICTOROVICH PURTO ,  ALEXEY STANISLAVOVICH LEBEDINSKY ,  DMITRY ANATOLIEVICH RUBTSOV

IPC: G01S19/24 ,  G01S19/30 ,  G01S19/27

CPC classification number: G01S19/243 ,  G01S19/02 ,  G01S19/27 ,  G01S19/30

Abstract: A method for demodulating and tracking of CSK-modulated signals comprising the steps of receiving a CSK-modulated signal at a plurality of correlators, the CSK-modulated signal including a transmitted symbol; convolving the CSK-modulated signal with a preset reference replica of the CSK-modulated signal for N shifts (D1 . . . DN) of a PRN code relative to an internal receiver clock corresponding to N possible code shifts in the transmitted symbol, and M other code shifts (T1 . . . TM), where M

公开(公告)号：US20230194730A1

公开(公告)日：2023-06-22

申请号：US18109503

申请日：2023-02-14

Applicant: Topcon Positioning Systems, Inc.

Inventor： ANDREY VLADIMIROVICH VEITSEL ,  LEONID VICTOROVICH PURTO ,  DMITRY ANATOLYEVICH RUBTSOV

IPC: G01S19/30 ,  G01S19/24 ,  H04B1/709 ,  G01S19/37 ,  H04B1/7073

CPC classification number: G01S19/30 ,  G01S19/243 ,  H04B1/709 ,  G01S19/37 ,  H04B1/7073

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.

公开(公告)号：US20210157016A1

公开(公告)日：2021-05-27

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

IPC: G01S19/35 ,  H04B1/00 ,  G01S19/33 ,  G01S19/41

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.

公开(公告)号：US20160285475A1

公开(公告)日：2016-09-29

申请号：US14865119

申请日：2015-09-25

Applicant: Topcon Positioning Systems, Inc.

Inventor： NIKOLAY AFANASIEVICH VAZHENIN ,  ANDREY VLADIMIROVICH VEITSEL ,  ALEXEY S. LEBEDINSKY ,  IVAN ANDREEVICH KIRJANOV

IPC: H03M13/11 ,  H03M13/37 ,  H04L1/00

CPC classification number: H03M13/1111 ,  H03M13/1128 ,  H03M13/3723 ,  H03M13/3746 ,  H03M13/458 ,  H04L1/005 ,  H04L1/0052 ,  H04L1/0057

Abstract: Method of identification and compensation for inversion of the input bit stream when decoding LDPC codes includes obtaining a code word of the LDPC code from a demodulator output and writing the code word into a buffer memory, decoding the code word, calculating a syndrome for each iteration when decoding, making an analysis of converging the weight of the syndrome, generating an inversion feature for the input bit stream based on this analysis, continuing the decoding, if the inversion feature for the input bit stream does not give evidence of detecting inversion, resetting, if the inversion feature for the input bit stream shows inversion, the LDPC decoder and analysis parameters for the convergence of the weight of the syndrome, reading next code word from the buffer memory, and producing an inversion of this code word, and feeding the word to the decoder input to implement the next decoding operation.

Abstract translation: 解码LDPC码时输入比特流的反转的识别和补偿方法包括从解调器输出获得LDPC码的码字，并将码字写入缓冲存储器，解码码字，计算每次迭代的综合征 在进行解码时，进行收敛的校正子的权重的分析，根据该分析生成输入比特流的反演特征，继续进行解码，如果输入比特流的反转特征没有提供检测到反转的证据， 如果输入比特流的反演特征显示为反转，则LDPC解码器和分析参数用于收敛该校正子的权重，从缓冲存储器中读取下一个码字，并产生该代码字的反转， 字到解码器输入来实现下一个解码操作。