公开(公告)号：US20230333232A1

公开(公告)日：2023-10-19

申请号：US17659426

申请日：2022-04-15

申请人： GM CRUISE HOLDINGS LLC

发明人： Daniel Flores Tapia

IPC分类号： G01S13/34 ,  G01S13/79 ,  G01S13/90

CPC分类号： G01S13/346 ,  G01S13/79 ,  G01S13/9023

摘要： Architectures and techniques for radar interference detection are provided. A radar sensor system in accordance with the present disclosure may receive, via a radio frequency (RF) receiver, radar signals including a radar signal of interest and one or more interfering radar signals. The radar sensor system may calculate a Doppler spectrum for each of the radar signals and perform a chirplet transform on the Doppler spectrum to generate various waveform parameters. A Principal Component Analysis (PCA) may be performed on the waveform parameters to extract frequency features of the radar signals. The radar sensor system may classify the frequency features using a classifier to identify interfering frequency features associated with the interfering radar signals using a classifier. The radar sensor system may further extract interfering waveform information based on the interfering frequency features of the interfering RF signals. Interference mitigation may be performed utilizing the interfering waveform information.

公开(公告)号：US20090033462A1

公开(公告)日：2009-02-05

申请号：US10590882

申请日：2005-02-21

申请人： Hitoshi Kitayoshi ,  Kunio Sawaya

发明人： Hitoshi Kitayoshi ,  Kunio Sawaya

IPC分类号： H04B1/59 ,  H01Q13/08 ,  H01Q9/16 ,  H04B5/02 ,  H02J17/00

CPC分类号： H04B1/59 ,  G01S7/023 ,  G01S13/765 ,  G01S13/79 ,  G06K19/0723 ,  G06K19/07749 ,  G06K19/07786 ,  H01Q1/2208 ,  H01Q1/248 ,  H01Q1/38 ,  H01Q9/065 ,  H01Q9/16 ,  H01Q23/00 ,  H02J17/00 ,  H02J50/27 ,  H02J50/40 ,  H02J50/60 ,  H02J50/90

摘要： The present invention aims to overcome the drawback with conventional RFID tag devices having a short communication range, and expand the communication range to several times or more that in the conventional scheme. The conventional scheme is based on equilibrium feeding/equilibrium modulation (a two-terminal circuit for antenna operation), whereas the present invention is based on disequilibrium feeding/equilibrium modulation (a three-terminal circuit for antenna operation). The conventional scheme is based on simple rectification of received RF signals, whereas the present invention employs a circuit based on a combination of a stub resonance-based, impedance transformation boosting scheme and a ladder boosting scheme. The conventional scheme is based on ASK or BPSK modulation, whereas the present invention is based on passive modulation, but can employ a QPSK modulation circuit.

摘要翻译： 本发明旨在克服具有短通信范围的常规RFID标签设备的缺点，并且将通信范围扩展到常规方案中的几倍或更多。 常规方案是基于均衡进给/平衡调制（用于天线操作的两端电路），而本发明基于不平衡馈电/平衡调制（用于天线操作的三端电路）。 常规方案是基于接收的RF信号的简单整流，而本发明采用基于短截线谐振，阻抗变换增强方案和梯形升压方案的组合的电路。 常规方案基于ASK或BPSK调制，而本发明基于无源调制，但可采用QPSK调制电路。

公开(公告)号：US5144313A

公开(公告)日：1992-09-01

申请号：US690498

申请日：1991-04-24

申请人： Steffen Kirknes

发明人： Steffen Kirknes

IPC分类号： G01S13/28 ,  G01S13/78 ,  G01S13/79

CPC分类号： G01S13/79

摘要： In an identification system based on reflection of radar signals from a bit-coded transponder, the received signals are processed to remove unwanted signals and noise from the required, reflected and received signals that have a recurrent cycle. The reflected signals are extremely weak in relation to the unwanted signals and noise. A random bit sequencer and a time slot generator are used to generate a single phase modulated pulse train which is transmitted by an RF transmitter. The pulse train signal is received and reflected from a coded passive transponder back to a comparable receiver. The receiver demodulates the incoming reflected signal and directs the demodulated signal to an integrator array. An inverted signal from the receiver is also utilized. Synchronization of the transmitted and received signals is performed through a shift register while the bit sequencer controls a second integrator array. In this way, the unwanted signals and noise associated with the low power reflected signal is substantially eliminated.

摘要翻译： 在基于来自位编码的应答器的雷达信号的反射的识别系统中，处理接收的信号以从具有循环周期的所需的，反射的和接收的信号中去除不需要的信号和噪声。 相对于不需要的信号和噪声，反射信号非常弱。 随机比特序列发生器和时隙发生器用于产生由RF发射机发送的单相调制脉冲串。 脉冲串信号被接收并从编码的无源应答器反射回相当的接收机。 接收机解调输入的反射信号并将解调的信号引导到积分器阵列。 还使用来自接收机的反相信号。 发送和接收信号的同步通过移位寄存器执行，同时位序列器控制第二积分器阵列。 以这种方式，基本上消除了与低功率反射信号相关联的不需要的信号和噪声。

公开(公告)号：US4513285A

公开(公告)日：1985-04-23

申请号：US289688

申请日：1981-08-03

申请人： Lawrence W. Pike ,  John W. Zscheile, Jr. ,  Billie M. Spencer

发明人： Lawrence W. Pike ,  John W. Zscheile, Jr. ,  Billie M. Spencer

IPC分类号： G01S13/79 ,  G01S13/08

CPC分类号： G01S13/79

摘要： An accurate radio frequency ranging system is provided for measuring the time required for a signal to be transmitted from a ground station to a remote station and to be returned to the ground station. The ground station is provided with a master reference clock that is employed to drive a first pseudonoise generator. The ranging system in the ground station is started by a unique and predetermined start epoch signal produced by the first pseudonoise generator. The first pseudonoise generated signals are transmitted to the remote station where they are tracked and sensed. When the original start epoch signal is sensed at the remote station, it is employed as a trigger or read signal to initiate the generation of a stop epoch signal. The stop epoch signal is retransmitted to the ground station and stored in a register where it is compared with pseudonoise generated signals being retransmitted from the remote station to the ground station. When the correlation between the two signals occurs, a new epoch stop signal is produced which stops the timing of the ranging system in the ground station. Since the pseudonoise generated signals transmitted from the remote station to stop the ranging system in the ground station are not locked on to the pseudonoise signals being transmitted from the ground station to the remote station, there is no requirement for turn-around coherency.

摘要翻译： 提供了一种精确的射频测距系统，用于测量从地面站到远程站发送信号所需的时间并返回到地面站。 地面站设置有用于驱动第一伪噪声发生器的主参考时钟。 地面站中的测距系统由第一伪噪声发生器产生的唯一且预定的起始时刻信号启动。 第一个伪噪声产生的信号被发送到远程站，在那里它们被跟踪和感测。 当在远程站处感测到原始开始纪元信号时，它被用作触发或读取信号来启动停止时期信号的产生。 停止时标信号被重新发送到地面站并存储在寄存器中，在该寄存器中，与从远程站重发的伪噪声产生的信号与地面站进行比较。 当发生两个信号之间的相关时，产生一个新的停止信号，停止地面站中测距系统的定时。 由于从远程站发送的伪噪声信号停止地面站中的测距系统并未锁定在从地面站向远程站发送的伪噪声信号，所以不需要转向一致性。

公开(公告)号：US4278977A

公开(公告)日：1981-07-14

申请号：US36012

申请日：1979-05-04

申请人： Edward J. Nossen

发明人： Edward J. Nossen

IPC分类号： G01S13/79 ,  G01S13/78

CPC分类号： G01S13/79

摘要： A range finding method and system comprising an interrogator and a transponder. The interrogator generates a signal with a first portion comprising a carrier signal amplitude modulated by a first two-level iterative pseudo random sequence (PRS) whose level changes coincide with level changes of a first two-level tone of frequency f.sub.T, which phase modulates said first portion. A second portion of the signal is phase modulated by the product of the PRS and said first tone. The transponder tracks the received interrogation signal and then generates and transmits a responsive signal having first and second portions comprised of a carrier signal phase modulated by a second two-level tone phase synchronized with the received first tone. The first portion is further amplitude modulated by a second iterative PRS phase synchronized with the received PRS signal, and the second portion is further phase modulated by the second, phase synchronized PRS. In response to the responsive signal, the interrogator generates a tracking tone of frequency f.sub.T, precisely phase locked by means including an arithmetic synthesizer, with the received second tone. The phases of the received second PRS and the originally generated first PRS are compared to determine the round-trip signal propagation time and thus the range.

摘要翻译： 一种测距方法和系统，包括询问器和应答器。 询问器产生具有第一部分的信号，该第一部分包括由第一两级迭代伪随机序列（PRS）调制的载波信号，其电平变化与频率fT的第一两级音调的电平变化一致，该相位调制所述 第一部分。 信号的第二部分被PRS和所述第一音调的乘积相位调制。 应答器跟踪接收到的询问信号，然后产生并发送具有第一和第二部分的响应信号，该第一和第二部分包括由与所接收的第一音调同步的第二二级音调相位调制的载波信号相位。 第一部分通过与接收的PRS信号同步的第二迭代PRS相进一步幅度调制，并且第二部分由第二相位同步PRS进一步相位调制。 响应于响应信号，询问器产生频率为fT的跟踪音，通过包括算术合成器的装置精确地相位锁定，并与接收到的第二音调。 比较接收的第二PRS和原始产生的第一PRS的相位以确定往返信号传播时间，从而确定范围。

公开(公告)号：US4232313A

公开(公告)日：1980-11-04

申请号：US293259

申请日：1972-09-22

申请人： Herman B. Fleishman

发明人： Herman B. Fleishman

IPC分类号： G01S5/14 ,  G01S13/79 ,  G01S13/93 ,  G01S19/05 ,  G01S19/11 ,  G01S19/21 ,  G01S19/29 ,  G01S19/46 ,  G01S13/00 ,  G01C21/00 ,  G01S3/02

CPC分类号： G01S13/93 ,  G01S13/79

摘要： Method and apparatus are provided for the tactical nagivation and communiion of a community of aircraft. Each of the aircraft in the community is provided with an inertial navigation system capable of providing accurate short term navigational information and a time synchronized ranging system capable of providing accurate long term navigational information. One of the aircraft is designated as the airborne control unit and establishes a relative grid coordinate system within which the community of aircraft operate. The origin of the relative grid is established by the airborne control unit. When stationary ground time synchronized ranging system units are present, highly accurate georeferenced information may be supplied to the airborne control unit by operation of its time synchronized ranging system. When such ground units are not present, accurate georeferenced information may be obtained by the airborne controller from navigational systems such as satellite, Loran or Omega systems. The remaining or "user" aircraft in the community determine their position in the relative grid by interrogating the airborne control unit with their time synchronized ranging systems. A Kalman filter technique is employed to update the short term navigational information derived from the inertial navigation system in each user aircraft with the long term navigational information obtained from the time synchronized ranging system, so that the highly accurate georeferenced navigational information from the airborne control unit is provided to each member of the community of user aircraft. Novel computer programming permits each aircraft in the community to derive navigational information having the best characteristics of navigational information available from several sources, so that very accurate navigation in the area defined by the relative grid is made possible. The system of the invention may also perform communication and identification functions for the members of the tactical community.

公开(公告)号：US4072943A

公开(公告)日：1978-02-07

申请号：US643481

申请日：1975-12-22

申请人： Jeffrey E. Miller

发明人： Jeffrey E. Miller

IPC分类号： G01S13/70 ,  G01S13/79 ,  G01S13/93 ,  G01S9/56

CPC分类号： G01S13/9303 ,  G01S13/70 ,  G01S13/79

摘要： A digital tracker in a cooperative collision avoidance system utilizing time division techniques, which is capable of generating track gates and determining critical values of tau (time to collision) for at least 16 targets during the same time frame, the maximum number of targets being limited essentially by the size of the logic memory elements used and the maximum range desired.

摘要翻译： 一种使用时分技术的协作碰撞避免系统中的数字跟踪器，其能够在同一时间帧期间产生轨道门并确定至少16个目标的τ（碰撞时间）的临界值，限制目标的最大数量 基本上是由所使用的逻辑存储元件的大小和所需的最大范围。

公开(公告)号：US4067010A

公开(公告)日：1978-01-03

申请号：US643328

申请日：1975-12-22

申请人： James Robert Hall

发明人： James Robert Hall

IPC分类号： G01S13/79 ,  G01S13/93 ,  G01S9/56

CPC分类号： G01S13/9303 ,  G01S13/79

摘要： In a cooperative collision avoidance system, probe signals are inhibited for a predetermined time period to prevent autogenetic false alarms, that is, false replies to one's own interrogation probes.

摘要翻译： 在协同碰撞避免系统中，探测信号被禁止预定的时间段以防止自发性错误警报，即对自己的询问探测器的错误答复。

公开(公告)号：US11943736B2

公开(公告)日：2024-03-26

申请号：US18161771

申请日：2023-01-30

申请人： Samsung Electronics Co., Ltd.

发明人： Zheda Li ,  Aditya V. Padaki ,  Boon Loong Ng

IPC分类号： H04W64/00 ,  G01S7/00 ,  G01S13/79

CPC分类号： H04W64/00 ,  G01S7/003 ,  G01S13/79

摘要： A method and apparatus of a first network entity in a wireless communication system is provide. The method and apparatus comprises: identifying at least one set of bit strings to generate a ranging scrambled timestamp sequence (STS); identifying at least one initialization vector (IV) field corresponding to the at least one set of bit strings, wherein the at least one IV field comprises a 4-octet string; generating a ranging STS key and IV information element (RSKI IE) that includes the at least one IV field to convey and align a seed that is used to generate the ranging STS; and transmitting, to a second network entity, the generated RSKI IE for updating the ranging STS of the second network entity.

公开(公告)号：US20230341540A1

公开(公告)日：2023-10-26

申请号：US18214562

申请日：2023-06-27

申请人： DENSO International America, Inc. ,  DENSO CORPORATION

发明人： Raymond Michael STITT ,  John VIDETICH

IPC分类号： G01S13/84 ,  B60R25/24 ,  B60R25/20 ,  G07C9/00

CPC分类号： G01S13/84 ,  B60R25/24 ,  B60R25/209 ,  B60R25/241 ,  B60R25/248 ,  G07C9/00309 ,  G01S13/79

摘要： A system is provided and includes a receiver and an access module. The receiver is configured to receive a signal transmitted from a portable access device to a vehicle. The access module is configured to generate a differentiated signal based on the received signal, up-sample the differentiated signal to generate a first up-sampled signal, up-sample an expected signal to generate a second up-sampled signal, cross-correlate the first up-sampled signal and the second up-sampled signal to generate a cross-correlation signal, determine, based on the cross-correlation signal, a phase difference between the first up-sampled signal and the second up-sampled signal, determine a round trip time of the signal received by the receiver based on the phase difference, and permit access to the vehicle based on the round trip time.