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公开(公告)号：US06721358B1
公开(公告)日：2004-04-13
申请号：US09404719
申请日：1999-09-01
申请人： Phillip E. Pace , Robert E. Surratt , Siew-Yam Yeo
发明人： Phillip E. Pace , Robert E. Surratt , Siew-Yam Yeo
IPC分类号： H03H730
CPC分类号： G01S7/38
摘要： A method and system for signal processing, especially useful as a signal repeater, i.e. for simulating the characteristic echo signature of a preselected target. The system has a digital radio frequency memory (DRFM) and associated circuitry, including digital tapped delay lines, and a modulator in each delay line to impose both amplitude and frequency modulation in each line. Use of digital semiconductor technology increases the bandwidth and sensitivity of such a repeater over prior analog based systems, reduces the noise of the repeated signal, reduces size and cost of such a system, and permits real time alteration of operating parameters, permitting rapid and adaptive shifting among different kinds of targets to be simulated. Preferably the associated circuitry is unitary with, and part of, the DRFM.
摘要翻译： 一种用于信号处理的方法和系统，特别用作信号中继器，即用于模拟预选目标的特征回波特征。 该系统具有数字射频存储器（DRFM）和相关电路，包括数字抽头延迟线以及每个延迟线中的调制器，以在每条线路中施加幅度和频率调制。使用数字半导体技术可增加带宽和灵敏度 这种基于现有模拟系统的中继器减少了重复信号的噪声，降低了这种系统的尺寸和成本，并且允许操作参数的实时改变，允许在要模拟的不同类型的目标之间快速和自适应地转换。 优选地，相关联的电路与DRFM是一体的，并且是DRFM的一部分。
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公开(公告)号：US07154431B2
公开(公告)日：2006-12-26
申请号：US10794543
申请日：2004-03-01
申请人： Phillip E. Pace , Robert E. Surratt , Siew-Yam Yeo
发明人： Phillip E. Pace , Robert E. Surratt , Siew-Yam Yeo
摘要： A digital synthesizer includes a digital radio frequency memory (DRFM) for storing phase values and corresponding digital signals. The digital synthesizer includes a digital processing circuit receiving input from the DRFM, the circuit including tapped delay lines and a summer summing the output of the tapped delay lines. The digital synthesizer includes a signal modulator independently synthesizing within each tapped delay line a frequency modulated and gain scaled signal, wherein input to the tapped delay lines are phase values from the DRFM.
摘要翻译： 数字合成器包括用于存储相位值的数字射频存储器（DRFM）和对应的数字信号。 数字合成器包括从DRFM接收输入的数字处理电路，该电路包括抽头延迟线和对抽头延迟线的输出进行加法求和。 数字合成器包括信号调制器，在每个抽头延迟线内单独合成调频和增益缩放信号，其中对抽头延迟线的输入是来自DRFM的相位值。
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3.发明授权Photonic analog-to-digital conversion using the robust symmetrical number system 有权使用鲁棒对称数字系统的光子模数转换公开(公告)号：US08269658B1
公开(公告)日：2012-09-18
申请号：US13011777
申请日：2011-01-21
IPC分类号： H03M1/00
CPC分类号： H03M1/345 , H04B2210/006
摘要： Embodiments in accordance with the invention allow for direct digitization of wideband RF signals without the need for down conversion or the use of mixers. In one embodiment, a preprocessed input analog signal is applied to three wideband Mach-Zehnder interferometers (MZI), e.g., modulators, to amplitude modulate a continuous wave laser signal. A photodetector is used at the output of each interferometer to convert the amplitude modulated optical signal into an electrical signal. This is followed by an amplifier and a low-pass filter (LPF) to increase the signal level and to reduce the noise. A small mi comparator bank at the output of each LPF is clocked at the sampling frequency and encodes the electrical signal from each detector into a thermometer code that represents an integer value within the modulus. A field programmable gate array (FPGA) then combines the thermometer-code from each comparator bank in order to generate a more convenient 6-bit binary representation, i.e., a digital output.
摘要翻译： 根据本发明的实施例允许宽带RF信号的直接数字化，而不需要下转换或使用混频器。 在一个实施例中，将预处理的输入模拟信号施加到三个宽带马赫 - 曾德干涉仪（MZI），例如调制器，以幅度调制连续波激光信号。 在每个干涉仪的输出处使用光电检测器来将幅度调制的光信号转换成电信号。 之后是放大器和低通滤波器（LPF），以增加信号电平并降低噪声。 每个LPF的输出端的一个小的mi比较器组以采样频率计时，并将每个检测器的电信号编码成表示模数内的整数值的温度计代码。 现场可编程门阵列（FPGA）然后组合来自每个比较器组的温度计代码，以便产生更方便的6位二进制表示，即数字输出。
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4.发明授权公开(公告)号：US06624780B1
公开(公告)日：2003-09-23
申请号：US10267094
申请日：2002-10-02
申请人： Douglas Jai Fouts , Phillip E. Pace
发明人： Douglas Jai Fouts , Phillip E. Pace
IPC分类号： G01S738
CPC分类号： G01S7/38
摘要： A system for generating a false target radar image for countering wideband synthetic aperture and inverse synthetic aperture imaging radar systems to prevent a selected target from being detected by such radar systems comprises a receiver system for producing a digital signal that represents an incident radar signal. A phase sampling circuit is connected to the receiver for sampling the digital signal and providing phase sample data. An image synthesizer circuit is connected to the phase sampling circuit and arranged to receive the phase sample data therefrom. The digital image synthesizer circuit is arranged to process the phase sample data to form a false target signal, which is input to a signal transmitter system arranged to transmit the synthesized false target signal so that it can be received by a radar system.
摘要翻译： 一种用于产生用于对抗宽带合成孔径和反向合成孔径成像雷达系统的假目标雷达图像以防止所选择的目标被这种雷达系统检测的系统包括用于产生表示入射雷达信号的数字信号的接收机系统。 相位采样电路连接到接收器，用于对数字信号进行采样并提供相位采样数据。 图像合成器电路连接到相位采样电路，并布置成从其接收相位采样数据。 数字图像合成器电路被布置为处理相位采样数据以形成伪目标信号，该伪目标信号被输入到被布置为发送合成的假目标信号以使其可被雷达系统接收的信号发射机系统。
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5.发明授权
公开(公告)号：US5617092A
公开(公告)日：1997-04-01
申请号：US395331
申请日：1995-02-28
申请人： Phillip E. Pace
发明人： Phillip E. Pace
CPC分类号： H03M1/141
摘要： An analog-to-digital converter in which an analog input signal is folded by a plurality of folding circuits whose moduli, and hence half folding periods, are mutually prime with respect to one another. Each folding circuit has an associated comparator ladder having one less comparator than the modulus of the folding circuit. The collective output of the ladders, i.e. the states of the comparators in the ladders, uniquely corresponds to input signal magnitude over a dynamic range equal to the product of the folding circuits' moduli, permitting a greater dynamic range for the converter for the number of comparators used.
摘要翻译： 一种模拟 - 数字转换器，其中模拟输入信号被多个折叠电路折叠，所述多个折叠电路的模数（因此半折叠周期）相对于彼此互补。 每个折叠电路具有与折叠电路的模数相比少一个比较器的相关比较器梯形图。 梯子的集体输出，即梯子中的比较器的状态，唯一地对应于等于折叠电路模数的乘积的动态范围内的输入信号幅度，允许转换器的较大动态范围为 比较器使用。
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公开(公告)号：US6031879A
公开(公告)日：2000-02-29
申请号：US964777
申请日：1997-11-05
申请人： Phillip E. Pace , Richard E. Leino , David Styer
发明人： Phillip E. Pace , Richard E. Leino , David Styer
摘要： An antenna receives an analog waveform and an analog signal indicative of the amplitude and frequency of the analog waveform. The analog signal is processed in a plurality of parallel digital processing channels each arranged to digitize the analog signal at a corresponding sampling frequency f.sub.si to produce a plurality of digital signals. A discrete Fourier transform is applied to each of the digital signals output to produce a corresponding plurality of unique Fourier spectra of length m.sub.i =(f.sub.si)(T.sub.Li) where T.sub.Li is the integration time for the discrete Fourier transform for each digital processing channel. The lengths of the Fourier spectra (m.sub.i) are selected to be pairwise relatively prime. The discrete Fourier transform encodes the signals in same form as the symmetrical number system (SNS). A SNS-to-decimal algorithm is then applied to the detected bin values (a.sub.i) to determine the numerical value of the frequency f of the analog waveform. The receiver resolves all undersampling ambiguities exactly, thereby relaxing the speed requirements on the digital section of the receiver.
摘要翻译： 天线接收模拟波形和表示模拟波形幅度和频率的模拟信号。 模拟信号在多个并行数字处理通道中被处理，每个并行数字处理通道被布置成以对应的采样频率fsi对模拟信号进行数字化，以产生多个数字信号。 对每个数字信号输出离散付里叶变换，以产生长度为mi =（fsi）（TLi）的对应多个唯一傅里叶谱，其中TLi是每个数字处理通道的离散付里叶变换的积分时间。 傅立叶光谱的长度（mi）被选择为成对相对素数。 离散傅里叶变换将信号与对称数字系统（SNS）相同的形式进行编码。 然后将SNS到十进制算法应用于检测到的bin值（ai）以确定模拟波形的频率f的数值。 接收机精确地解决所有欠采样模糊度，从而放宽接收机数字部分的速度要求。
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