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1. 发明公开

US20230333207A1 Distribution Fitting Constant False Alarm Rate (CFAR) Detection 审中-公开
公开(公告)号：US20230333207A1
公开(公告)日：2023-10-19
申请号：US17664943
申请日：2022-05-25
申请人： Aptiv Technologies Limited
发明人： Xining Yu
IPC分类号： G01S7/292 , G01S7/41 , G01S13/20
CPC分类号： G01S7/2927 , G01S7/414 , G01S13/20 , G01S7/417
摘要： Distribution fitting Constant False Alarm Rate (CFAR) detection is described. Noise data in cells or bins around a target cell are fit to a noise distribution model, such as a Rayleigh distribution model. With a suitable noise distribution curve from the distribution model, a CFAR threshold for that cell along the curve can be determined. A quantile function of the noise distribution model for a bin or cell provides the CFAR threshold to use for that bin or cell. Distribution fitting CFAR enables a more-accurate CFAR threshold to be set for each bin or cell and may use far fewer computing resources than Ordered-Statistics CFAR. A radar detector can better prevent false alarm detections across multiple different driving scenarios by adapting to different environments and dynamically changing the noise distribution curve used depending on best-fit analysis by a noise distribution model of noise characteristics of the neighboring bins or cells.

2. 发明授权

US11353585B2 Range finding method 有权
公开(公告)号：US11353585B2
公开(公告)日：2022-06-07
申请号：US16313229
申请日：2017-05-10
申请人： RIEGL LASER MEASUREMENT SYSTEMS GMBH
发明人： Andreas Ullrich
IPC分类号： G01S17/00 , G01S17/10 , G01S17/42 , G01S7/487 , G01S17/89 , G01S13/20 , G01S13/22 , G01S7/4865 , G01S7/484
摘要： The present disclosed subject matter relates to a method for measuring the distance of targets in the surroundings by way of a time-of-flight measurement of pulses reflected at said targets, in particular laser pulses, said method comprising: emitting a sequence of transmission pulses having varying pulse intervals, and receiving at least one receive pulse after each one of two different transmission pulses; for each receive pulse: generating a group of M candidate distances, each based on a different transmission pulse among M transmission pulses preceding the receive pulse, wherein each candidate distance is assigned to the corresponding transmission pulse on which it is based; for each candidate distance: determining a weighting value on the basis of at least the closest of the candidate distances assigned to such a transmission pulse which is adjacent to the transmission pulse to which the candidate distance being considered in this determining process is assigned; for each group: selecting the candidate distance with the highest weighting value as the distance measurement value of the receive pulse for which the group was generated.

3. 发明授权

US11307298B2 Position, navigation, and timing (PNT) methods and systems 有权
公开(公告)号：US11307298B2
公开(公告)日：2022-04-19
申请号：US16676823
申请日：2019-11-07
申请人： Raytheon Company
发明人： Kenneth V. Miller
IPC分类号： G01S13/28 , G01S13/20 , H04B17/318 , G01S13/00
摘要： The present disclosure relates to position, navigation and timing (PNT) methods, systems, and transmitters. A method comprises receiving radio-frequency (RF) signals from a plurality of virtual transmitters and determining PNT information of a target object based on information obtained from the RF signals. A system comprises a plurality of virtual transmitters and a receiver. The plurality of virtual transmitters is configured to transmit radio-frequency (RF) signals that include PNT information. The receiver is configured to determine PNT information of a target object based on the PNT information. A transmitter comprises a high-frequency (HF) carrier generator, a waveform generator, and an antenna system. The HF carrier generator generates an HF carrier signal. The waveform generator generates a waveform that includes PNT information. The antenna system transmits the HF carrier signal to generate a subject ionospheric duct. The antenna system is further configured to transmit the waveform through the ionospheric duct.

4. 发明授权

US07064704B2 Apparatus for radar 失效
标题翻译：雷达装置
公开(公告)号：US07064704B2
公开(公告)日：2006-06-20
申请号：US10835574
申请日：2004-04-30
申请人： Bengt Bergkvist
发明人： Bengt Bergkvist
IPC分类号： G01S13/20 , G01S13/522
CPC分类号： G01S13/22 , G01S7/2923 , G01S13/18 , G01S13/20
摘要： A radar transmits electromagnetic energy in pulse repetition intervals and receives reflections from objects in range gates including Doppler filters. The radar approves desirable ambiguous echoes and suppresses ambiguous echoes of no interest or that interfere with the radar's display. The radar frequency varies according to a staggered or wobbling pattern. The ambiguous echoes produce one pulse in the range gates within a predetermined number of periods. The Doppler filter works with an impulse function response that includes a small number of samples. The Doppler filter, during the predetermined number of periods, gives rise to independent samples from reflectors within the radar's unambiguous range. When the independent samples exceed the small number of samples, the radar approves the ambiguous echo. Otherwise, it is suppressed. In this way, ambiguous echoes are prevented from interfering with the reception or display of echoes. The suppression of asynchronous interferences can be made easier.
摘要翻译：雷达以脉冲重复间隔传输电磁能，并接收包括多普勒滤波器在内的范围门中物体的反射。雷达批准了所需的模糊回波，并且抑制了不感兴趣的或者干扰雷达显示的不明确的回波。雷达频率根据交错或摆动模式而变化。模糊回波在预定数量的周期内在范围门中产生一个脉冲。多普勒滤波器具有包含少量样本的脉冲函数响应。在预定数量的周期内，多普勒滤波器产生独立样本，不受雷达清晰范围内的反射器的影响。当独立样本超过少量样本时，雷达批准模糊回波。否则，它被抑制。以这种方式，阻止歧义回波干扰回波的接收或显示。抑制异步干扰可以更容易。

5. 发明授权

US4926185A Multiple radio frequency single receiver radar operation 失效
标题翻译：多射频单接收雷达操作
公开(公告)号：US4926185A
公开(公告)日：1990-05-15
申请号：US262917
申请日：1988-10-26
申请人： Peter Wittenberg
发明人： Peter Wittenberg
IPC分类号： G01S13/20 , G01S13/24
CPC分类号： G01S13/24
摘要： A pulse radar system including an RF exciter for generating a repeating sequence of internal pulses of RF energy of different frequencies. A transmit circuit responsive to the internal pulses of RF energy generates a transmit radar signal comprising a transmit repeating sequence of transmit intervals during which pulses of RF energy are transmitted. A single receiver responsive to the repeating sequence of internal RF pulses receives radar return signals based on all of the RF frequencies in a receive repeating sequence of receive intervals which do not occur at the same time as said transmit intervals.

6. 发明授权

US4727376A Process for measuring the ambiguous distance and pulse Doppler radar using such a process 失效
标题翻译：使用这种过程测量模糊距离和脉冲多普勒雷达的过程
公开(公告)号：US4727376A
公开(公告)日：1988-02-23
申请号：US561830
申请日：1983-12-13
申请人： Michel Prenat
发明人： Michel Prenat
IPC分类号： G01S13/20 , G01S13/10
CPC分类号： G01S13/20
摘要： The present invention relates to a process for measuring the ambiguous distance in a pulse Doppler radar of repetition frequency (f.sub.R).The device comprises means (3) for transposing the signal received R(t) by a signal of frequency p.multidot.f.sub.R, where p is a positive integer; first and second narrow band filtering means (2,5) isolating the principal line of the signal received R(t) and of the transposed signal d(t) respectively, and means (6) for measuring the phase difference (.DELTA..phi.) which exists between the two filtered signals and which is proportional to the ambiguous distance with a coefficient g.
摘要翻译：本发明涉及用于测量重复频率（fR）的脉冲多普勒雷达中的模糊距离的方法。该装置包括用于将接收的信号R（t）转换成频率为pxfR的信号的装置（3），其中p是正整数; 第一和第二窄带滤波装置（2,5）分别接收R（t）和转置信号d（t）的信号的主线，以及用于测量相位差（DELTA phi）的装置（6）存在于两个滤波信号之间，并且与系数g的模糊距离成比例。

7. 发明授权

US4584579A Medium PRF pulse doppler radar processor for dense target environments 失效
标题翻译：中等PRF脉冲多普勒雷达处理器，用于密集的目标环境
公开(公告)号：US4584579A
公开(公告)日：1986-04-22
申请号：US547609
申请日：1983-11-01
申请人： Edward L. Frost , Leslie Lawrence
发明人： Edward L. Frost , Leslie Lawrence
IPC分类号： G01S7/28 , G01S13/20 , G01S13/524
CPC分类号： G01S13/20 , G01S13/5246 , G01S7/2813
摘要： This invention is a modification to the ABC range correlators of U.S. Pat. No. 4,095,222 to Mooney, Jr., used in medium PRF radars. It extends the functioning of the range correlators to not only derive target unambiguous range while suppressing detections of clutter discretes but also to reduce the occurrence of false target reports (range ghosts) and blanking of true targets that would otherwise occur when the radar is operated in dense target environments. The specific point of novelty in this design is the operation of two sets of correlators, designated ABC and A'B'C', each with a different M of N detection criterion.
摘要翻译：本发明是对美国专利申请的ABC范围相关器的修改。 Mooney，Jr.的4,095,222号，用于中等PRF雷达。它扩展了范围相关器的功能，不仅能够导出目标明确的范围，同时抑制杂波离散的检测，而且还可以减少伪目标报告（范围重影）的发生以及当雷达操作时会发生的真实目标的消隐密集的目标环境。该设计中的具体特点是两组相关器的操作，指定为ABC和A'B'C'，每组具有不同的N检测标准。

8. 发明公开

US20240329226A1 Method for Operating a Radar Sensor for Distance Measurement and Corresponding Radar Sensor 审中-公开
公开(公告)号：US20240329226A1
公开(公告)日：2024-10-03
申请号：US18615342
申请日：2024-03-25
申请人： KROHNE S.A.S.
发明人： Samuel Grosdidier , Olivier Dubray
IPC分类号： G01S13/20 , G01F23/292 , G01S7/292
CPC分类号： G01S13/20 , G01F23/292 , G01S7/2927
摘要： A method for operating a radar sensor includes: emitting a signal; receiving a receive signal having first and second reflection pulses; determining receive times and amplitudes for the first and second reflection pulses; and determining distance information from the receive times. The detection step includes: setting an initial receive time and an initial maximum as the receive time and amplitude of the first reflection pulse; generating a first difference signal by subtracting from the receive signal a first reference pulse having the receive time and amplitude of the first reflection pulse, and using the same to determine the receive time and amplitude of the second reflection pulse; and generating a second difference signal by subtracting from the receive signal a second reference pulse having the receive time and amplitude of the second reflection pulse, and using the same to determine the receive time and amplitude of the first reflection pulse.

9. 发明申请

US20200166625A1 WIDEBAND RADAR SYSTEMS, APPARATUSES, AND METHODS 审中-公开
公开(公告)号：US20200166625A1
公开(公告)日：2020-05-28
申请号：US16202737
申请日：2018-11-28
申请人： Lockheed Martin Corporation
发明人： Fotis P. KOUBIADIS , Nicholas J. Romano
IPC分类号： G01S13/30 , G01S13/20 , G01S13/28 , G01S7/292 , G01S7/288
摘要： Radar signals are generated to have signal characteristics that define multiple sub-pulses in each of a plurality of pulse repetition intervals (PRIs) of a single radar dwell. Electromagnetic radiation is emitted according to the radar signals and the emitted electromagnetic radiation is sensed as radar return signals over a receive interval in each PRI. Coherent integration is performed on a set of the radar return signals and non-coherent integration is performed on another set of the radar return signals.

10. 发明申请

US20190011547A1 SYSTEMS AND METHODS FOR RESOLVING VELOCITY AMBIGUITY IN AN AUTOMOTIVE RADAR SYSTEM 审中-公开
公开(公告)号：US20190011547A1
公开(公告)日：2019-01-10
申请号：US15643636
申请日：2017-07-07
申请人： Veoneer US, Inc.
发明人： QH Han , Dirk Klotzbuecher
IPC分类号： G01S13/20 , G01S13/58 , G01S13/93 , G01S13/30
摘要： In general the systems and methods described herein relate to velocity ambiguity resolution in an automotive radar system. More particularly, systems and methods produce a unique composite waveform that alternates between, interleaves or otherwise combines a plurality of component waveforms, each characterized by a different velocity ambiguity. Velocity ambiguity is then resolved by determining corresponding Doppler bins which correctly reflect ambiguous velocity calculations for both component waveforms. The systems and methods of the present disclosure are applied to a unique composite linear frequency modulated continuous waveform where component waveforms are generated by modulating one or more parameters of the waveform to change the velocity ambiguity range. Moreover, the systems and methods may selectively apply ambiguity resolution based on the velocity of a host vehicle.

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