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    • 14. 发明授权
    • Direct sequence spread spectrum DSP system
    • 直接序列扩频DSP系统
    • US5920589A
    • 1999-07-06
    • US559913
    • 1995-11-17
    • Robert E. RouquetteGary A. NadenH. Britton Sanderford
    • Robert E. RouquetteGary A. NadenH. Britton Sanderford
    • H04B1/707
    • H04B1/70752H04B1/707H04B1/70755H04B1/70775H04B1/708H04B1/7097H04B1/7101
    • A direct sequence spread spectrum (DSSS) DSP implementation technique utilizing a unique combination of multiple filters, transforms, despreading algorithm and spectral compression, all in a single coefficient set, providing a highly efficient system requiring relatively nominal computational hardware and software requirements. Reallocatable computational resources allow for frequency uncertainty in the transmitter, without the typical excessive noise bandwidth penalties. The present system further contemplates a unique energy detection algorithm for discerning spread spectrum while in the search mode, utilizing several discrete sampling data sets to increase signal strength, reducing noise, while changing the relative phase of the received chipping code with respect to the received signal. The spectral compression of the spreading sequence is achieved by representing the PRC as an array of two, complimenting fractional coefficients. The PRC code is filtered to achieve the required spectral compression characteristics, resulting in minimal despreading loss, while providing interference rejection of CW signals greater than 1.5 MHz from the center IF frequency.
    • 直接序列扩频(DSSS)DSP实现技术利用多个滤波器,变换,解扩算法和频谱压缩的独特组合,全部在单个系数集中,提供需要相对标称计算硬件和软件要求的高效系统。 可重新定位的计算资源允许发射机中的频率不确定性,而不会产生典型的过多的噪声带宽损失。 本系统进一步考虑了一种独特的能量检测算法,用于在搜索模式下识别扩展频谱,利用若干离散采样数据集增加信号强度,降低噪声,同时改变接收到的切片码相对于接收信号的相对相位 。 扩展序列的频谱压缩通过将PRC表示为两个相加的分数系数的阵列来实现。 对PRC码进行滤波以实现所需的频谱压缩特性,从而产生最小的去扩展损耗,同时从中心IF频率提供大于1.5MHz的CW信号的干扰抑制。
    • 15. 发明授权
    • Enhanced frequency agile radio
    • 增强频率捷变电台
    • US5668828A
    • 1997-09-16
    • US311774
    • 1994-09-23
    • H. Britton Sanderford, Jr.Robert J. DavisRobert E. Rouquette
    • H. Britton Sanderford, Jr.Robert J. DavisRobert E. Rouquette
    • H03J1/00H04B1/713H04B1/715H04J13/00H04L7/04
    • H04J13/00H03J1/0091H04B1/713H04B1/715H04B2001/7152H04B2001/7154H04L7/041
    • An enhanced frequency-agile radio for avoiding undesired signal energy, based on a prediction, by scanning an available radio spectrum, measuring a receiver output, identifying an occupied portion of the available spectrum, predicting a level of undesired signal energy in a future scan, and storing the prediction. Enhancements provided by the frequency-agile radio include lowered implementation complexity appropriate for very low cost receivers and transceivers, reduced size due to elimination of larger components allowing for physically small pocket pager applications, increased anti-jam performance appropriate for wide area networks, increased receiver sensitivity and frequency tracking desirable for voice applications, enhanced signal coding error tolerance allowing operation within congested portions of the radio band and additional signal verification means which allow correct data reception from thousands of concurrently operating, collision prone transmit-only devices such as power utility meters and long range security systems.
    • 基于预测,通过扫描可用的无线电频谱,测量接收机输出,识别可用频谱的占用部分,预测未来扫描中的不需要的信号能量的水平,来增强频率敏捷无线电装置,用于避免不期望的信号能量, 并存储该预测。 由频率敏捷无线电提供的增强功能包括适用于非常低成本的接收机和收发器的降低的实现复杂度,由于消除较大的组件而减小尺寸,允许物理上小的小型寻呼机应用,增加适用于广域网的抗干扰性能,增加的接收机 灵敏度和频率跟踪对于语音应用是期望的,增强的信号编码容错能力允许在无线频带的拥塞部分内进行操作,以及附加信号验证装置,其允许从成千上万的同时操作的,易碰撞的仅发射装置(例如功率电表) 和远程安全系统。
    • 17. 发明授权
    • Direct sequence spread spectrum method, computer-based product,
apparatus and system tolerant to frequency reference offset
    • 直接序列扩频方法,基于计算机的产品,装置和系统容忍频率参考偏移
    • US5999561A
    • 1999-12-07
    • US929891
    • 1997-09-15
    • Gary A. NadenRobert E. RouquetteH. Britton Sanderford, Jr.Dale E. ReiserCharles A. HwangMarc L. Reed
    • Gary A. NadenRobert E. RouquetteH. Britton Sanderford, Jr.Dale E. ReiserCharles A. HwangMarc L. Reed
    • H04B1/707
    • H04B1/707
    • A method, apparatus, computer-based product and system employs a digital receiver (or transceiver) to receive, digitize and process a direct sequence spread spectrum signal using efficient, low-cost digital signal processing components. A radio front end portion of the receiver receives and digitizes the signal, and a digital signal processing portion downconverts and despreads the signal by applying a pseudorandom noise (PN) code, used at a transmitter to spread a data signal contained in the direct sequence spread spectrum signal, to the received signal. In order to initially align, and maintain alignment of, the PN code with the direct sequence spread spectrum signal, a timing and state control mechanism is included that provides time reference correction information to the signal processing components of the receiver. This time reference correction information allows the receiver to be compatible with transmitters using inaccurate frequency references which impart a significant frequency ambiguity in the received signal. Additional features include computer-based synchronization methods and mechanisms suitable for use for low performance digital signal processors and employ power management mechanisms that enable long-term operation using battery power. The power management mechanisms enable the receiver to operate in a network setting, over the course of multiple years off battery power, with similar receivers, transmitters and transceiver that communicate with one another using direct sequence spread spectrum signals.
    • 一种方法,装置,基于计算机的产品和系统使用数字接收机(或收发器)来使用有效的低成本数字信号处理组件来接收,数字化和处理直接序列扩频信号。 接收机的无线电前端部分接收并数字化该信号,并且数字信号处理部分通过应用在发射机处使用的伪随机噪声(PN)码来对信号进行下变频和解扩,以扩展包含在直接序列扩展中的数据信号 频谱信号,到接收信号。 为了初始对准和保持PN码与直接序列扩频信号的对准,包括向接收机的信号处理部件提供时间基准校正信息的定时和状态控制机制。 该时间参考校正信息允许接收机与使用不准确的频率参考的发射机兼容,这在接收信号中赋予显着的频率模糊。 附加功能包括适用于低性能数字信号处理器的基于计算机的同步方法和机制,并采用使用电池电源进行长期运行的电源管理机制。 功率管理机制使得接收机能够使用类似的接收机,发射器和收发器在多年的关闭电池电力的过程中在使用直接序列扩频信号彼此通信的网络设置中进行操作。
    • 19. 发明授权
    • Radio position determination method and apparatus
    • 无线电位置确定方法和装置
    • US4799062A
    • 1989-01-17
    • US42838
    • 1987-04-27
    • H. Britton Sanderford, Jr.Robert E. RouquetteJames D. Arthur
    • H. Britton Sanderford, Jr.Robert E. RouquetteJames D. Arthur
    • G01S5/00G01S5/02G01S19/48H04B1/707G01S3/02
    • G01S5/0284G01S5/0009G01S5/02G01S5/0215H04B2201/70715
    • A method and apparatus for radio position determination is provided including an unknown position transmitter for transmitting a radio wave having compensation for multipath, a plurality of base repeaters having a synchronized pulse for time reference, for receiving the radio wave emitted by the unknown position transmitter and for determining the relative times-of-arrival of the radio wave with respect to the synchronized pulse, and a central monitoring station coupled to the base repeaters for computing from the locations of the base repeaters and from the measured times-of-arrival, a coarse-position fix of the unknown-position transmitter. The system may include a mobile reference transceiver located within the coarse-position fix, for transmitting a reference signal, wherein the central monitoring station generates a differential position from the reference signal and the radio wave for guiding the mobile reference transceiver to the unknown position transmitter.
    • 提供了一种用于无线电位置确定的方法和装置,包括用于发送具有多路径补偿的无线电波的未知位置发射机,具有用于时间参考的同步脉冲的多个基本中继器,用于接收由未知位置发射机发射的无线电波; 用于确定无线电波相对于同步脉冲的相对到达时间,以及耦合到基本转发器的中央监控站,用于从基本转发器的位置和从测量的到达时间开始计算, 未知位置变送器的粗位置固定。 该系统可以包括位于粗定位置中的移动参考收发器,用于发送参考信号,其中中央监控站从参考信号和无线电波生成差分位置,以将移动参考收发器引导到未知位置发送器 。