公开(公告)号：US5600328A

公开(公告)日：1997-02-04

申请号：US492968

申请日：1995-06-21

申请人： Ryobun Tachita ,  Akihisa Kawasaki ,  Izumi Satoh

发明人： Ryobun Tachita ,  Akihisa Kawasaki ,  Izumi Satoh

IPC分类号： G01S1/00 ,  G01S19/23 ,  H04B1/707 ,  G01S5/02

CPC分类号： G01S19/243 ,  G01S19/29 ,  H04B1/707 ,  G01S19/37

摘要： A demodulator circuit in which N satellite signals included in N radio waves transferred from N satellites are detected by removing noise codes and carrier waves modulated by the satellite signals and the noise codes from the radio waves to measure a position of a movable body is disclosed. N pseudo-noise code signals indicating pseudo-noise codes corresponding to noise codes peculiar to the satellites are generated in N pseudo-noise code generators, and N correlation signals indicating degrees of correlation between the radio waves and the N pseudo-noise code signals are generated in N correlation units. Therefore, the noise codes are removed from the radio waves. Also, M carrier oscillating signals corresponding to each of the carrier waves of the radio waves are generated in (N.times.M) carrier local oscillators, and the N correlation signals are frequency-converted into (N.times.M) base signals with the (N.times.M) carrier oscillating signals in (N.times.M) orthogonal frequency converters. Therefore, the carrier waves are removed from the radio waves. Thereafter, the satellite signals of the satellites are detected by time-integrating N base signals relating to N carrier oscillating signals of which frequencies agree with those of the carrier waves.

摘要翻译： 公开了一种解调器电路，其中通过从卫星信号和由无线电波调制的噪声码去除噪声码和移动体的位置来检测来自N个卫星的N个无线电波中包括的N个卫星信号。 在N个伪噪声码发生器中产生指示对应于卫星特有的噪声码的伪噪声码的N个伪噪声码信号，表示无线电波与N个伪噪声码信号之间的相关度的N个相关信号为 以N个相关单位生成。 因此，从无线电波中去除噪声码。 此外，在（N×M）个载波本地振荡器中产生与无线电波的每一个载波相对应的M个载波振荡信号，并且使用（N×M）个载波振荡信号将N个相关信号频率转换为（N×M）个基本信号 in（NxM）正交变频器。 因此，从无线电波去除载波。 此后，卫星的卫星信号通过对与频率与载波的频率一致的N个载波振荡信号有关的N个基本信号进行时间积分来检测。

公开(公告)号：US5563608A

公开(公告)日：1996-10-08

申请号：US281215

申请日：1994-07-27

申请人： Ryobun Tachita ,  Ken Ikeda ,  Akihisa Kawasaki ,  Izumi Sato

发明人： Ryobun Tachita ,  Ken Ikeda ,  Akihisa Kawasaki ,  Izumi Sato

IPC分类号： G01C21/30 ,  G01S1/00 ,  G01S5/14 ,  G01S19/29 ,  H04B7/185 ,  G01S5/02

CPC分类号： G01S19/13 ,  G01C21/30 ,  G01S19/42

摘要： In a position measuring system, a position of a moving body is derived when data is sufficient for such derivation. On the other hand, when data is insufficient for such derivation, an area which may include the position of the moving body is derived. Accordingly, a user correctly evaluates reliability of information which is displayed. In a position measuring method, a measurement error of the derived position is evaluated. Further, a moving error evaluation is performed to evaluate an increase of the error. By changing the measurement error of the derived position, the area which includes the position of the moving body with high reliability can be displayed to the user.

摘要翻译： 在位置测量系统中，当数据足够用于这种推导时，导出移动体的位置。 另一方面，当这种推导的数据不足时，导出可包括移动体的位置的区域。 因此，用户正确评估所显示的信息的可靠性。 在位置测量方法中，评估导出位置的测量误差。 此外，执行移动误差评估以评估误差的增加。 通过改变导出位置的测量误差，可以向使用者显示包括移动体的高可靠性位置的区域。

公开(公告)号：US5847678A

公开(公告)日：1998-12-08

申请号：US857597

申请日：1997-05-16

申请人： Ryobun Tachita

发明人： Ryobun Tachita

IPC分类号： G01S1/00 ,  G01S19/22 ,  G01S19/29 ,  G01S19/37 ,  H04B7/185

CPC分类号： G01S19/30

摘要： A GPS receiver including a receiving portion for receiving a GPS signal, a PN code signal generator, a correlation detector including a reproduced carrier signal generator, and a phase difference detector is disclosed. A frequency and a phase of the reproduced carrier signal are controlled according to a correlation result to track the carrier signal in the GPS signal, the PN code signal generator generates the PN code with a phase thereof controlled by phase control data from the correlation result, and amplitudes of the GPS signal is repeatedly sampled at timings with a deviation from an edge of PN code signal from the PN code signal generator varied. A zero-cross point on the variation of the sampled amplitudes provides a phase difference. The total phase difference is derived by summing the phase control data and the phase difference. To more accurately detect the phase difference, an interpolation may be effected. The sampling timings may be collectively generated as a train of sampling signal. The variation may be stored to estimate the receiving condition, so that the phase controlling may be effected adaptively.

摘要翻译： 公开了一种GPS接收机，包括用于接收GPS信号的接收部分，PN码信号发生器，包括再现的载波信号发生器的相关检测器和相位差检测器。 根据相关结果控制再现的载波信号的频率和相位以跟踪GPS信号中的载波信号，PN码信号发生器产生PN码，其相位由来自相关结果的相位控制数据控制， 并且在与来自PN码信号发生器的PN码信号的边缘偏离的定时处重复采样GPS信号的幅度。 对采样幅度变化的零交叉点提供了相位差。 总相位差是通过对相位控制数据和相位差求和来推导出的。 为了更精确地检测相位差，可以进行插值。 采样定时可以集中生成为采样信号序列。 可以存储变化来估计接收条件，从而可以自适应地实现相位控制。

公开(公告)号：US4800577A

公开(公告)日：1989-01-24

申请号：US78247

申请日：1987-07-06

申请人： Ryobun Tachita ,  Ken Ikeda ,  Akio Teranishi

发明人： Ryobun Tachita ,  Ken Ikeda ,  Akio Teranishi

IPC分类号： G01S5/14 ,  G01S19/22 ,  G01S19/30 ,  G01S19/33 ,  H03L7/099 ,  H04L7/10

CPC分类号： G01S19/24 ,  H03L7/0991

摘要： A GPS receiver comprising a pseudonoise generator for simultaneously generating pseudonoise signals respectively corresponding to satellite electromagnetic waves transmitted from two or more satellites, an oscillator for simultaneously regenerating carrier waves of the plurality of satellite electromagnetic waves, and a plurality of demodulators responsive to the regenerated carrier waves and the pseudonoise signals to demodulate individual satellite electromagnetic waves independently, to thereby regenerate data transmitted from individual satellites, each demodulator being operative, during demodulation, to detect a set of phases of one pseudonoise signal and one regenerated carrier wave relative to one satellite electromagnetic wave on time division basis and including a first mixer for mixing of one pseudonoise signal, a second mixer for mixing of one regenerated carrier wave and a filter, whereby a set of phases of one pseudonoise signal and one regenerated carrier wave is changed to another set at timed relationship with transmission of data from individual satellites to measure a phase of one pseudonoise signal relative to one satellite electromagnetic wave, thereby tracking data transmitted from individual satellites on the basis of the measured phase.

摘要翻译： 一种GPS接收机，包括用于同时产生分别对应于从两个或更多个卫星发送的卫星电磁波的伪噪声信号的伪噪声发生器，用于同时再生多个卫星电磁波中的载波的振荡器，以及响应于再生载波的多个解调器 波和伪噪声信号以独立地解调单个卫星电磁波，从而在解调期间重新生成从各个卫星发射的数据，每个解调器都可操作，以便相对于一个卫星电磁体检测一个伪噪声信号和一个再生载波的一组相位 并且包括用于混合一个伪噪声信号的第一混频器，用于混合一个再生载波的滤波器的第二混频器，由此改变一个伪噪声信号和一个再生载波的一组相位 以相对于来自各个卫星的数据传输的定时关系与另一组测量相对于一个卫星电磁波的一个伪噪声信号的相位，从而基于测量的相位跟踪从各个卫星发送的数据。

公开(公告)号：US5081462A

公开(公告)日：1992-01-14

申请号：US701273

申请日：1991-05-16

申请人： Ryobun Tachita ,  Ken Ikeda

发明人： Ryobun Tachita ,  Ken Ikeda

IPC分类号： G01S1/00 ,  G01S19/29 ,  G01S19/30

CPC分类号： G01S19/30

摘要： A method, for use in a receiver for the NAVSTAR global positioning system (GPS), of deriving successive values of phase of a received pseudo-random code signal following a momentary interruption of satellite signal reception, with the effects of signal noise eliminated by averaging processing, by first setting a replica pseudo-random code signal to an initial phase value which provides high correlation with the received code signal, and thereafter periodically executing phase derivation operations to obtain the phase of the received code signal, by obtaining the phase difference between the received and replica code signals, obtaining the average value of all of such phase differences obtained up to that point since the initial phase derivation operation, and adding that average value to the sum of a phase value obtained in the first phase derivation operation and a total estimated amount of change of phase of the received code since that first operation. The estimated phase change is obtained based on a corresponding amount of frequency change that has occurred in the carrier of the received signal.

摘要翻译： 一种在NAVSTAR全球定位系统（GPS）的接收机中使用的方法，用于在卫星信号接收的瞬间中断之后导出接收到的伪随机码信号的相位的连续值，通过平均消除信号噪声的影响 通过首先将复制伪随机码信号设置为与接收到的码信号提供高相关性的初始相位值，然后周期性地执行相位导出操作以获得接收到的码信号的相位，通过获得接收码信号的相位差， 接收和复制码信号，获得从初始相位推导操作起直到那一点获得的所有这些相位差的平均值，并将该平均值加到在第一阶段推导操作中获得的相位值之和和 自第一次操作以来接收到的代码的相位估计量的总计。 基于在接收信号的载波中发生的相应的频率变化量，获得估计的相位变化。

公开(公告)号：US4552152A

公开(公告)日：1985-11-12

申请号：US513323

申请日：1983-07-13

申请人： Ryobun Tachita ,  Tsutomu Yano ,  Hiroshi Fukukita ,  Kuniaki Fukaya ,  Akira Fukumoto

发明人： Ryobun Tachita ,  Tsutomu Yano ,  Hiroshi Fukukita ,  Kuniaki Fukaya ,  Akira Fukumoto

IPC分类号： A61B8/00 ,  A61B8/06 ,  A61B10/00

CPC分类号： A61B8/06

摘要： Ultrasonic echo signals are detected in phase and integrated with a period corresponding to an ultrasonic pulse. The integrated values are sampled and the difference between two integrated values is successively frequency-analyzed.

摘要翻译： 超声波回波信号被相位检测并且与对应于超声脉冲的周期集成。 对积分值进行采样，并对两个积分值之间的差值进行连续频率分析。

公开(公告)号：US4440025A

公开(公告)日：1984-04-03

申请号：US277816

申请日：1981-06-26

申请人： Yoshihiro Hayakawa ,  Tsutomu Yano ,  Ryobun Tachita ,  Hiroshi Fukukita ,  Kazuyoshi Irioka ,  Akira Fukumoto

发明人： Yoshihiro Hayakawa ,  Tsutomu Yano ,  Ryobun Tachita ,  Hiroshi Fukukita ,  Kazuyoshi Irioka ,  Akira Fukumoto

IPC分类号： H04R17/00 ,  A61B8/00 ,  A61B8/14 ,  B06B1/06 ,  G01S7/521 ,  G01S7/523 ,  G01S15/89 ,  G10K11/02 ,  G10K11/30 ,  G10K11/32 ,  G10K11/34 ,  G01N29/00

CPC分类号： G01S15/892 ,  B06B1/0633 ,  G10K11/02 ,  G10K11/32

摘要： An ultrasonic transducer array for arc scan imaging systems comprises a plurality of elongated piezoelectric transducers arranged successively to define a convexed energy radiating surface. A plano-concave acoustic diverging lens is attached to the convexed surface to diverge the acoustic energy transmitted from the transducers in an increased steering angle. The transducers are assembled on an impedance matching layer which defines the convexed radiating surface. The acoustic impedance of the diverging lens is substantially equal to the acoustic impedance of the human body, while the acoustic impedance of the impedance matching layer is greater than that of the human body.

摘要翻译： 用于电弧扫描成像系统的超声换能器阵列包括多个细长的压电换能器，其连续布置以限定凸起的能量辐射表面。 平凹声扩散透镜附着到凸起的表面上，以在增加的转向角度上分离从换能器传递的声能。 换能器组装在限定凸起辐射表面的阻抗匹配层上。 发散透镜的声阻抗基本上等于人体的声阻抗，而阻抗匹配层的声阻抗大于人体的声阻抗。

公开(公告)号：US4330875A

公开(公告)日：1982-05-18

申请号：US103478

申请日：1979-12-14

申请人： Ryobun Tachita ,  Hiroshi Fukukita

发明人： Ryobun Tachita ,  Hiroshi Fukukita

IPC分类号： A61B8/00 ,  A61B8/14 ,  G01S7/52 ,  G10K11/34 ,  G01S9/66

CPC分类号： G01S7/52046 ,  G10K11/345 ,  G10K11/346

摘要： A focusing circuit for focusing an array of transducers of an ultrasound imaging system includes a variable delay line comprising a plurality of summing amplifiers and a plurality of variable delay elements provided between successive summing amplifiers. A plurality of switches is provided for respectively connecting the transducers to selected summing amplifiers. The amount of delay of each variable delay element is individually controlled so that the corresponding electrical signals derived from the transducers arrive in phase at the output end of the variable delay line.

摘要翻译： 用于聚焦超声成像系统的换能器阵列的聚焦电路包括可变延迟线，其包括多个求和放大器和设置在连续求和放大器之间的多个可变延迟元件。 提供多个开关用于将换能器分别连接到所选择的求和放大器。 每个可变延迟元件的延迟量被单独地控制，使得从换能器导出的对应电信号在可变延迟线的输出端同相到达。

公开(公告)号：US4696058A

公开(公告)日：1987-09-22

申请号：US678161

申请日：1984-12-04

申请人： Ryobun Tachita ,  Akio Teranishi

发明人： Ryobun Tachita ,  Akio Teranishi

IPC分类号： H04B7/08 ,  H04B1/06

CPC分类号： H04B7/0808

摘要： A diversity receiver provides plural antennas, one receiving part for receiving the radio wave from one of the plural antennas and a control part for selecting one antenna from the plural antennas, wherein the antenna is selected in a manner that an antenna receiving the most intensive radio wave is detected by switching of the plural antennas in-turn in a time period T.sub.1, and the detected antenna is selected for receiving an information of the radio wave in a time period T.sub.2, the plural antennas may be disposed with distances shorter than a wavelength of the radio wave.

摘要翻译： 分集接收机提供多个天线，一个用于从多个天线之一接收无线电波的接收部分和用于从多个天线中选择一个天线的控制部分，其中天线以接收最密集无线电的天线 通过在时间段T1内依次切换多个天线来检测波，并且选择检测天线以在时间段T2内接收无线电波的信息，多个天线可以布置成比波长短的距离 的无线电波。

公开(公告)号：US4423737A

公开(公告)日：1984-01-03

申请号：US231935

申请日：1981-02-04

申请人： Tsutomu Yano ,  Yoshihiro Hayakawa ,  Ryobun Tachita ,  Kazuyoshi Irioka ,  Hiroshi Fukukita ,  Akira Fukumoto

发明人： Tsutomu Yano ,  Yoshihiro Hayakawa ,  Ryobun Tachita ,  Kazuyoshi Irioka ,  Hiroshi Fukukita ,  Akira Fukumoto

IPC分类号： A61B8/00 ,  A61B8/08 ,  A61B8/14 ,  G01S7/52 ,  G01S15/89 ,  A61B10/00

CPC分类号： A61B8/14 ,  G01S15/8918 ,  G01S7/52074

摘要： Ultrasonic echo signals are successively sampled and converted to digital echo data which are written into a first digital memory column by column and then read out row by row into a first buffer memory. The digital echo data which are derived in response to beams successively transmitted in a predetermined direction are written into columns of a second digital memory and read out of the memory in rows into a second buffer memory. The data stored in the first and second buffer memories are read out for digital-to-analog conversion and selectively applied within a television "frame" interval to control electron beam intensity of a single cathode ray tube so as to present tomographic and cardiographic images in different display areas of the tube.

摘要翻译： 超声波回波信号被连续采样并转换成数字回波数据，数字回波数据逐列地写入第一数字存储器，然后逐行读出到第一缓冲存储器中。 响应于沿预定方向连续发送的波束而导出的数字回波数据被写入第二数字存储器的列，并以行的形式从存储器读出到第二缓冲存储器中。 读出存储在第一和第二缓冲存储器中的数据进行数模转换，并选择性地施加在电视“帧”间隔内以控制单个阴极射线管的电子束强度，以便将断层摄影和心电图像呈现在 管的不同显示区域。