公开(公告)号：US09350414B2

公开(公告)日：2016-05-24

申请号：US14370947

申请日：2013-10-28

Applicant: Topcon Positioning Systems, Inc.

Inventor： Andrey V. Veitsel ,  Victor A. Prasolov ,  Dmitry D. Murzinov

IPC: H04B1/00 ,  H04B1/71 ,  H04B1/10

CPC classification number: H04B1/1036 ,  H04B1/10 ,  H04B1/109 ,  H04B1/7101 ,  H04B2001/1063 ,  H04B2201/709709

Abstract: A digital filter for narrowband interference rejection, including modules of narrowband interference rejection connected in series, each of which includes the following elements connected in series: a block of successive vector rotation based on the CORDIC vector rotation algorithm for integers, a block of reduction of the length of the rotated vector to maintain the same number of bits for digital signal representation, a block of high-pass filters for orthogonal components of the reduced vector in order to remove the interference from zero frequency region. The filter can be implemented without multiplication.

公开(公告)号：US09391655B2

公开(公告)日：2016-07-12

申请号：US14993130

申请日：2016-01-12

Applicant: Topcon Positioning Systems, Inc.

Inventor： Andrey V. Veitsel ,  Victor A. Prasolov ,  Dmitry D. Murzinov

IPC: H04B1/00 ,  H04B1/10

CPC classification number: H04B1/1036 ,  H04B1/10 ,  H04B1/109 ,  H04B1/7101 ,  H04B2001/1063 ,  H04B2201/709709

Abstract: A digital filter for narrowband interference rejection, including modules of narrowband interference rejection connected in series, each of which includes the following elements connected in series: a block of successive vector rotation based on the CORDIC vector rotation algorithm for integers, a block of reduction of the length of the rotated vector to maintain the same number of bits for digital signal representation, a block of high-pass filters for orthogonal components of the reduced vector in order to remove the interference from zero frequency region. The filter can be implemented without multiplication.

Abstract translation: 一种用于窄带干扰抑制的数字滤波器，包括串联连接的窄带干扰抑制模块，每个模块包括串联连接的以下元件：基于用于整数的CORDIC矢量旋转算法的连续矢量旋转块， 旋转矢量的长度以维持数字信号表示相同数量的比特，用于减少向量的正交分量的高通滤波器块，以便消除来自零频率区域的干扰。 滤波器可以无乘法实现。

公开(公告)号：US20160126991A1

公开(公告)日：2016-05-05

申请号：US14993130

申请日：2016-01-12

Applicant: Topcon Positioning Systems, Inc.

Inventor： Andrey V. Veitsel ,  Victor A. Prasolov ,  Dmitry D. Murzinov

IPC: H04B1/10

CPC classification number: H04B1/1036 ,  H04B1/10 ,  H04B1/109 ,  H04B1/7101 ,  H04B2001/1063 ,  H04B2201/709709

Abstract: A digital filter for narrowband interference rejection, including modules of narrowband interference rejection connected in series, each of which includes the following elements connected in series: a block of successive vector rotation based on the CORDIC vector rotation algorithm for integers, a block of reduction of the length of the rotated vector to maintain the same number of bits for digital signal representation, a block of high-pass filters for orthogonal components of the reduced vector in order to remove the interference from zero frequency region. The filter can be implemented without multiplication.

公开(公告)号：US09759753B2

公开(公告)日：2017-09-12

申请号：US14654881

申请日：2014-11-18

Applicant: Topcon Positioning Systems, Inc.

Inventor： Andrey V. Veitsel ,  Victor A. Prasolov ,  Dmitry D. Murzinov ,  Igor A. Orlovsky

IPC: G01R23/16 ,  G01R23/173

CPC classification number: G01R23/16 ,  G01R23/173

Abstract: System for digital sweep type spectrum analysis with up/down frequency provides measurements of frequency spectrum of complex analog baseband input signal. The signal is quantized into three levels with fs based on the bandwidth of the input signal. Four multiplexers, a first block of registers and a block of adders perform operations equivalent to complex multiplication of the quadrature components. Two complex signals with up and down shifted spectrum are produced by the adders. The quadrature components are inputted to the accumulators with reset, which act as low-pass filters and accumulate several samples at a constant frequency fLO of the local oscillator. Levels of two accumulated complex samples are estimates of input signal spectrum in two frequency points +fLO and −fLO. A sweep controller changes a frequency of the local oscillator from zero up to fs/2. Estimates of the input signal spectrum are generated sequentially in range −fs/2 to +fs/2.