公开(公告)号：US07266465B1

公开(公告)日：2007-09-04

申请号：US11270096

申请日：2005-11-09

申请人： James B. Y. Tsui ,  Charles Richard Ward ,  Stuart Mitchell Lopata

发明人： James B. Y. Tsui ,  Charles Richard Ward ,  Stuart Mitchell Lopata

IPC分类号： G01R23/00 ,  G01R23/16

CPC分类号： G01R23/12

摘要： An apparatus for confirming a frequency measurement of a received signal includes a discrete Fourier transform (DFT) module for receiving a sampled digital signal. The DFT module is configured to analyze the received sampled digital signal, and output amplitude values at different frequency components. A threshold comparator is included for receiving the amplitude values of the frequency components and outputting a thresholded-amplitude value exceeding a predetermined threshold value. A frequency confirmation is provided based on the thresholded-amplitude value. The sampled digital signal is sampled at a sampling frequency of fs, and the DFT module is configured to analyze the received sampled digital signal at a frequency bandwidth that is equal to or less than fs. The frequency bandwidth is equal to the sampling frequency of fs, when the received sampled digital signal includes I and Q signals. The DFT module is configured to analyze the received sampled digital signal by examining N frequency components, where N equals the total number of frequency components equally spaced between 0 and the sampling frequency.

摘要翻译： 用于确认接收信号的频率测量的装置包括用于接收采样数字信号的离散付里叶变换（DFT）模块。 DFT模块被配置为分析接收的采样数字信号，并输出不同频率分量的振幅值。 包括阈值比较器，用于接收频率分量的振幅值，并输出超过预定阈值的阈值振幅值。 基于阈值振幅值提供频率确认。 以采样频率f 3采样数字信号，并且DFT模块被配置为以等于或小于f S的频率带宽分析所接收的采样数字信号 。 当接收到的采样数字信号包括I和Q信号时，频率带宽等于f采样频率。 DFT模块被配置为通过检查N个频率分量来分析接收到的采样数字信号，其中N等于0和采样频率之间相等间隔的频率分量的总数。

公开(公告)号：US07206707B1

公开(公告)日：2007-04-17

申请号：US11170121

申请日：2005-06-29

申请人： James B. Y. Tsui ,  Stuart Mitchell Lopata ,  Charles Richard Ward

发明人： James B. Y. Tsui ,  Stuart Mitchell Lopata ,  Charles Richard Ward

IPC分类号： G01R23/00 ,  G06F19/00 ,  G01S13/00 ,  G01S7/36

CPC分类号： G01R23/12 ,  G01S7/021

摘要： An IFM receiver includes a hybrid for outputting I and Q signals from a received input signal; a first ADC for digitizing the I signal to produce a first digital signal at a sampling rate of 1/τ, and a second ADC for digitizing the Q signal to produce a second digital signal at the same sampling rate. A processor is configured to (a) delay the first and second digital signals by at least one sample time of τ, (b) count the number of samples produced having predetermined phase shifts, and (c) determine the frequency of the received input signal, based on the number of samples having the predetermined phase shifts. The first and second ADCs are each 1-bit analog-to-digital converters. The predetermined phase shifts of 0°, 90°, −90° and 180° are counted by the processor over a predetermined time interval.

摘要翻译： IFM接收机包括用于从接收的输入信号输出I和Q信号的混合器; 第一ADC，用于数字化I信号以产生1 /τ的采样率的第一数字信号;以及第二ADC，用于数字化Q信号以产生相同采样率的第二数字信号。 处理器被配置为（a）将第一和第二数字信号延迟至少一个采样时间τ，（b）对具有预定相移产生的采样数进行计数，以及（c）确定所接收的输入信号的频率 ，基于具有预定相移的样本数。 第一和第二ADC均为1位模数转换器。 在预定的时间间隔内，由处理器对0°，90°，-90°和180°的预定相移进行计数。