公开(公告)号：US5420592A

公开(公告)日：1995-05-30

申请号：US42551

申请日：1993-04-05

申请人： Russell K. Johnson

发明人： Russell K. Johnson

IPC分类号： G01S5/00 ,  G01S5/14 ,  G01S19/11 ,  H04B7/185 ,  G01S5/02

CPC分类号： G01S19/09 ,  G01S11/10 ,  G01S19/35 ,  H04B7/18552 ,  G01S5/0036

摘要： A rawinsonde system embodiment of the present invention includes a digital GPS snapshot buffer and a serial communications controller for transmitting message frames formed of a combination of digital GPS data from the snapshot buffer and digitized hardwired meteorological data input from a humidity-temperature-pressure instrument. The message frames are telemetered at a relatively low rate over a meteorological radio band to a ground station. Substantially all of the conventional GPS digital signal processing is performed by the ground station, including carrier recovery, PRN code locking, pseudo-range extraction, ephemeris data extraction, almanac collection, satellite selection, navigation solution calculation and differential corrections. Ground processing further includes Kalman filter wind velocity calculation.

摘要翻译： 本发明的生物素体系统实施例包括数字GPS快照缓冲器和串行通信控制器，用于发送由来自快照缓冲器的数字GPS数据和从湿度 - 温度 - 压力仪器输入的数字化的硬接线气象数据的组合形成的消息帧。 消息帧以比较低的速率通过气象无线电频带遥测到地面站。 基本上所有的常规GPS数字信号处理都由地面站执行，包括载波恢复，PRN码锁定，伪距离提取，星历数据提取，历书收集，卫星选择，导航解决方案计算和差分校正。 地面处理还包括卡尔曼滤波风速计算。

公开(公告)号：US4803631A

公开(公告)日：1989-02-07

申请号：US101091

申请日：1987-09-25

申请人： Anthony K. Newman

发明人： Anthony K. Newman

IPC分类号： G01S5/00 ,  G01S5/02 ,  G01S11/10 ,  G01S19/53 ,  G06F15/20 ,  G01S13/08 ,  G06G7/34 ,  G06G7/78

CPC分类号： G01S11/10 ,  G01S5/0009 ,  G01S5/02

摘要： An iterative process for computing the trajectory of one object containing a transmitter relative to another object containing a plurality of receivers is disclosed. The process contains a subprocess which estimates the trajectory band from the Doppler shifts in the signals measured by the receivers. The process contains another subprocess where the received Doppler signals are filtered by filter adapted to select the Doppler signals which would have been produced by an object following the trajectory estimated by the first subprocess.

摘要翻译： 公开了一种用于计算包含发射机的一个物体相对于包含多个接收机的另一物体的轨迹的迭代过程。 该过程包含一个子过程，其估计由接收机测量的信号中的多普勒频移的轨迹带。 该过程包含另一个子过程，其中所接收的多普勒信号被滤波器滤波，该滤波器适于选择将由跟随由第一子过程估计的轨迹的对象产生的多普勒信号。

公开(公告)号：US4716574A

公开(公告)日：1987-12-29

申请号：US702322

申请日：1985-02-15

申请人： Paul W. Baier ,  Peter Rausch

发明人： Paul W. Baier ,  Peter Rausch

IPC分类号： G01S1/20 ,  G01S3/14 ,  G01S11/08 ,  G01S11/10 ,  H04B1/69 ,  H04L7/00

CPC分类号： H04B1/69 ,  G01S1/20 ,  G01S11/08 ,  G01S11/10 ,  G01S3/14

摘要： In a signal transmission system for broadband signals wherein the transmitting transducer and/or the receiving transducer has a non-isotropic radiation characteristic, properties of the received broadband signal, for example waveform shape, spectrum, duration and probability density function, depend on the alignment orientation of the transducers. A discriminator circuit is provided in the receiver for identifying or estimating parameters related to one or more of such properties as a measure of alignment orientation of the transducers. The invention can be utilized, for example, in noise-suppressing radio frequency message transmission systems wherein band spreading modulation (spread-spectrum-system) results in transmission of a much greater bandwidth than a conventional transmission of the message baseband frequencies.

摘要翻译： 在用于宽带信号的信号传输系统中，其中发射换能器和/或接收换能器具有非各向同性辐射特性，所接收的宽带信号的特性，例如波形形状，频谱，持续时间和概率密度函数取决于对准 传感器的方位。 在接收机中提供鉴别器电路，用于识别或估计与诸如换能器的对准取向的测量之类的一个或多个属性有关的参数。 例如，本发明可以用于噪声抑制射频消息传输系统中，其中频带扩展调制（扩频系统）导致传输比消息基带频率的传统传输大得多的带宽。

公开(公告)号：US4701934A

公开(公告)日：1987-10-20

申请号：US771754

申请日：1985-09-03

申请人： Steven C. Jasper

发明人： Steven C. Jasper

IPC分类号： G01S1/00 ,  G01S5/14 ,  G01S11/10 ,  G01S19/30 ,  G01S19/34 ,  H04K1/00

CPC分类号： G01S19/29 ,  G01S11/10

摘要： An improved method of doppler searching in a digital GPS receiver is described. According to the principles of the present invention, an N-point fourier transform is performed on samples of a down converted GPS signal representing the entire range of Doppler-shifted GPS carrier frequencies. The magnitude of the square of each of the output samples is calculated to produce N power quantities, corresponding to N search frequencies. The power quantities for each of the N search frequencies are then summed to produce N quantities proportional to average power. The maximum of the N-power quantities indicates the presence of the corresponding GPS signal.

摘要翻译： 描述了一种在数字GPS接收机中进行多普勒搜索的改进方法。 根据本发明的原理，对表示多普勒频移的GPS载波频率的整个范围的降频转换的GPS信号的采样进行N点傅立叶变换。 计算每个输出样本的平方的大小，以产生对应于N个搜索频率的N个功率量。 然后将N个搜索频率中的每一个的功率量相加以产生与平均功率成比例的N个量。 N个功率量的最大值表示存在相应的GPS信号。

公开(公告)号：US4453165A

公开(公告)日：1984-06-05

申请号：US455433

申请日：1983-01-03

申请人： Reuben E. Maine

发明人： Reuben E. Maine

IPC分类号： G01S1/00 ,  G01S5/14 ,  G01S11/10 ,  G01S19/44 ,  G01S19/46 ,  G01S5/02 ,  G01S3/52

CPC分类号： G01S11/10 ,  G01S19/29

摘要： A receiver accurately measures the Doppler shift of a radio signal from a transmitter having a known frequency and moving with respect to the receiver by using the signal from another transmitter of known frequency as a reference. The signals from the two transmitters are received by a single antenna, separated, and processed in separate channels. In a typical application using Global Positioning System satellite signals, each signal is discretely extracted by auto-correlation with its own pseudorandum noise signal, filtered, amplified, and applied to second mixers in phase locked loops in the respective channels. The two resulting second IF signals are applied to an output mixer whereupon the resulting difference output signal represents the difference in frequency between the two Doppler signals.

摘要翻译： 接收机通过使用来自已知频率的另一发射机的信号作为参考，精确地测量具有已知频率并且相对于接收机移动的无线电信号的无线电信号的多普勒频移。 来自两个发射机的信号由单个天线接收，分离并在单独的信道中处理。 在使用全球定位系统卫星信号的典型应用中，每个信号通过与其自身的伪随机噪声信号的自相关离散地提取，经过滤波，放大并应用于相应信道中的锁相环中的第二混频器。 所产生的两个第二IF信号被施加到输出混频器，由此产生的差分输出信号表示两个多普勒信号之间的频率差。

公开(公告)号：US3996590A

公开(公告)日：1976-12-07

申请号：US296321

申请日：1972-10-10

申请人： Calvin Miles Hammack

发明人： Calvin Miles Hammack

IPC分类号： G01S1/30 ,  G01S3/46 ,  G01S5/02 ,  G01S5/14 ,  G01S11/02 ,  G01S11/10 ,  G01S13/58 ,  G01S13/66 ,  G01S13/87 ,  G01S19/32 ,  G01S19/44 ,  G01S19/48 ,  G01S19/49 ,  G01S19/51 ,  G01S3/02

CPC分类号： G01S11/10 ,  G01S1/302 ,  G01S11/02 ,  G01S13/46 ,  G01S13/58 ,  G01S13/66 ,  G01S13/87 ,  G01S3/46 ,  G01S5/02 ,  G01S5/14 ,  G01S2013/466

摘要： This invention relates to an improvement in the art of navigating, detecting and tracking moving objects, position finding, mapping and such subjects employing a plurality of stations and variational measurements.

摘要翻译： 本发明涉及导航，检测和跟踪移动物体，位置查找，映射以及使用多个台站和变化测量的这些主体的技术的改进。

公开(公告)号：US3971923A

公开(公告)日：1976-07-27

申请号：US564022

申请日：1975-03-31

申请人： John L. Linder

发明人： John L. Linder

IPC分类号： G01S11/10 ,  G01S13/58 ,  G01S13/66 ,  H03K4/48 ,  H03K4/08 ,  G06J1/00

CPC分类号： H03K4/48 ,  G01S11/10 ,  G01S13/586 ,  G01S13/66

摘要： A control circuit having a digital memory for providing sweep voltages to ceivers in a doppler satellite tracking station of proper amplitude and duration to ensure searching in the correct doppler frequency range. An internally generated ramp function voltage is combined with a reference voltage to produce a composite sweep signal for the receiver. The reference voltage level is determined either from a set of digi-switches or from a digital memory circuit which outputs a digital signal that is a function of the frequency of a received doppler signal.

摘要翻译： 一种具有数字存储器的控制电路，用于向多普勒卫星跟踪站中的接收机提供适当幅度和持续时间的扫描电压，以确保在正确的多普勒频率范围内进行搜索。 内部产生的斜坡函数电压与参考电压组合以产生用于接收器的复合扫描信号。 参考电压电平由一组数字开关或数字存储器电路确定，该数字存储器电路输出作为接收的多普勒信号的频率的函数的数字信号。

公开(公告)号：US3887794A

公开(公告)日：1975-06-03

申请号：US40820173

申请日：1973-10-29

申请人： ELECTRAC INC

发明人： KATZ LOUIS ,  WELLS LAWRENCE

IPC分类号： G01S11/10 ,  G06F15/50 ,  G01S9/42

CPC分类号： G01S11/10

摘要： A doppler shift computer is disclosed wherein are inputted two separate input carrier frequencies, a high and low carrier frequency (RF) that have been transmitted from a moving transmitter. The receiver frequencies are separated by a signal divider and then the information frequencies are separated from the respective carrier frequencies. Due to the relative motion between the transmitter and the computer, the respective received carrier frequencies have shifted from the respective transmitted frequencies due to doppler effect, and also due to variations in the atmosphere resulting in undesirable frequency error. Therefore, each received carrier frequency includes these frequency components, the transmitted frequency plus or minus the doppler frequency, plus or minus the error frequency. The carrier frequency is known but the doppler and error frequencies are both unknown. In the simplified embodiment, to separate the doppler or the error frequencies therefrom, the received higher carrier frequency is mixed within a first mixer with the output frequency of an oscillator containing a reference frequency plus the higher carrier frequency so that the reference frequency is outputted therefrom. This output frequency from the first mixer is maintained equal to the reference by a phase comparative circuit whose voltage output controls the frequency outputted by a first voltage controlled oscillator at some fixed multiple of the reference frequency plus the higher carrier frequency. A first divider circuit divides the output frequency of the voltage controlled oscillator whereby its output is the reference frequency plus the higher carrier frequency that is inputted to the first mixer. The received lower carrier frequency in the other channel is mixed in a second mixer, also with the output frequency of the voltage controlled oscillator that has been divided by a second divider circuit by a divisor that makes the ratio of the divisors of both divider circuits equal to the ratio of the signal frequencies. This frequency outputted by the second mixer is maintained equal to a fixed fraction of the frequency outputted by a second voltage controlled oscillator. The frequency outputted by the second voltage controlled oscillator is mixed in a controlled manner with one of the frequencies controlling the first voltage controlled oscillator, thus removing the error component therefrom.

公开(公告)号：US3866229A

公开(公告)日：1975-02-11

申请号：US28842972

申请日：1972-09-12

申请人： HAMMACK CALVIN M

发明人： HAMMACK CALVIN MILES

IPC分类号： G01S1/30 ,  G01S3/46 ,  G01S5/02 ,  G01S5/14 ,  G01S11/02 ,  G01S11/10 ,  G01S13/58 ,  G01S13/66 ,  G01S13/87 ,  G01S19/32 ,  G01S19/44 ,  G01S19/48 ,  G01S19/49 ,  G01S19/51 ,  G01S5/04

CPC分类号： G01S11/10 ,  G01S1/302 ,  G01S3/46 ,  G01S5/02 ,  G01S5/14 ,  G01S11/02 ,  G01S13/46 ,  G01S13/58 ,  G01S13/66 ,  G01S13/87 ,  G01S2013/466

摘要： This invention relates to a method and means of determining at least one dimension of the position-motion state of one or more points relative to at least one reference point by performing a plurality of measurements comprising measurements of angular variations or angular differences, or of functions of such angular variations or angular differences. The apexes of such angular variations or differences are located at the reference points.

摘要翻译： 本发明涉及通过执行包括角度变化或角度差异或功能的测量的多个测量来确定相对于至少一个参考点的一个或多个点的位置运动状态的至少一个维度的方法和装置 具有这种角度变化或角度差异。 这些角度变化或差异的顶点位于参考点。

公开(公告)号：US3795911A

公开(公告)日：1974-03-05

申请号：US3795911D

申请日：1970-09-21

申请人： HAMMACK C

发明人： HAMMACK C

IPC分类号： G01S1/30 ,  G01S3/46 ,  G01S5/02 ,  G01S5/14 ,  G01S11/02 ,  G01S11/10 ,  G01S13/58 ,  G01S13/66 ,  G01S13/87 ,  G01S19/49 ,  G01S19/51 ,  G01S9/44

CPC分类号： G01S11/02 ,  G01S1/302 ,  G01S3/46 ,  G01S5/02 ,  G01S5/14 ,  G01S7/40 ,  G01S7/4052 ,  G01S7/497 ,  G01S7/52004 ,  G01S11/10 ,  G01S13/58 ,  G01S13/66 ,  G01S13/87 ,  G01S2007/4095 ,  G01S2013/466

摘要： This invention relates to an improvement in the art of detecting and tracking moving objects employing a plurality of stations and variational measurements.

摘要翻译： 本发明涉及使用多个站和变分测量来检测和跟踪移动物体的技术的改进。