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1.发明授权公开(公告)号：US11573312B2
公开(公告)日：2023-02-07
申请号：US17190222
申请日：2021-03-02
申请人： NXP B.V.
IPC分类号： G01S13/44
摘要： A mechanism is provided for determining an unambiguous direction of arrival (DoA) for radio frequency (RF) signals received by a sparse array. A DoA angle domain is split into hypothesis regions. The hypothesis regions are derived from the phase differences of the antenna element pairs used for the DoA angle estimate. In each hypothesis region, the ambiguous phase of antenna element pairs is unwrapped according to expected wrap-around. After unwrapping the phase, for each hypothesis region, a phasor is calculated by combining the individual antenna element pair phasors. The hypothesis region that obtains the phasor with a largest amplitude is selected as the most likely DoA region and the phase of the winning phasor is used as an unambiguous estimate for the DoA angle.
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公开(公告)号：US11294031B2
公开(公告)日：2022-04-05
申请号：US16512988
申请日：2019-07-16
申请人： NXP B.V.
IPC分类号： G01S7/41 , G01S13/931
摘要： A mechanism is provided to determine if a short-range automotive radar detection is a direct reflection or an indirect (also known as “multipath”) reflection from a physical target object. The multipath information is further used to perform a height estimation of the object. Embodiments provide a radar system having a range resolution smaller than a path difference between the direct reflection path and the indirect reflection path. Both range separation techniques and Doppler separation techniques are utilized to provide a reliable and accurate estimation of the height of the object.
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公开(公告)号：US20210255303A1
公开(公告)日：2021-08-19
申请号：US16790319
申请日：2020-02-13
申请人： NXP B.V.
IPC分类号： G01S13/58
摘要： Embodiments are directed to a method for determining velocity of an object. The method includes in response to two interleaved chirp sequences being sent towards the object, processing responsive chirps of each of the two interleaved chirp sequences independently from one another to produce respective Doppler-spectrum data sets, and calculating the velocity of the object based on the respective Doppler-spectrum data sets. Each of the interleaved chirp sequences being characterized by a common time spacing between respective chirps of the respective chirp sequence, and each chirp of one of the chirp sequences being offset by an amount of time that is different than the common time spacing.
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公开(公告)号：US20210018592A1
公开(公告)日：2021-01-21
申请号：US16512988
申请日：2019-07-16
申请人： NXP B.V.
摘要： A mechanism is provided to determine if a short-range automotive radar detection is a direct reflection or an indirect (also known as “multipath”) reflection from a physical target object. The multipath information is further used to perform a height estimation of the object. Embodiments provide a radar system having a range resolution smaller than a path difference between the direct reflection path and the indirect reflection path. Both range separation techniques and Doppler separation techniques are utilized to provide a reliable and accurate estimation of the height of the object.
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公开(公告)号：US20240111012A1
公开(公告)日：2024-04-04
申请号：US18473342
申请日：2023-09-25
申请人： NXP B.V.
摘要： An apparatus configured to:
receive an input dataset indicative of the amplitude and phase of radar signals received at a plurality of antenna elements;
determine an objective function;
determine a beam forming spectrum, the beam forming spectrum comprising a correlation of the input dataset with a set of beamsteering vectors;
perform a first determination process for evaluation of the objective function comprising the processor being configured to:
identify two or more peaks in the beam forming spectrum based on a predetermined threshold level, determine candidate direction-of-arrival angles therefrom for definition of a first-reduced search space;
perform a second determination process for evaluation of the objective function comprising the processor being configured to:
determine a peak direction-of-arrival angle comprising the direction-of-arrival angle that corresponds to a peak in the beam forming spectrum:
evaluate the objective function over the first reduced search space and using the peak direction-of-arrival angle.-
公开(公告)号：US20230152435A1
公开(公告)日：2023-05-18
申请号：US17818016
申请日：2022-08-08
申请人： NXP B.V.
发明人： Arie Geert Cornelis Koppelaar , Marco Jan Gerrit Bekooij , Francesco Laghezza , Feike Guus Jansen , Yiting Lu
CPC分类号： G01S13/34 , G06F1/03 , G06F17/156
摘要： An apparatus configured to receive an input dataset, x, indicative of radar signals reflected from targets as received at a plurality of antenna elements; define a matrix, A, formed of direction-of-arrival-angle vectors, an, each direction-of-arrival-angle vector representing an expected response at the plurality of antenna elements of radar signals from one of the targets; define a signal amplitude vector s to represent expected complex amplitudes as received in the radar signals; define an objective function based on x, A and s; search for a set of direction of arrival angles for each of the plurality of targets by the repeated evaluation of the objective function for a plurality of candidate matrices based on matrix A; and wherein said search space comprises a plurality of discrete points, z, associated with the direction of arrival angles by a function of sin(θk).
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公开(公告)号：US11550027B2
公开(公告)日：2023-01-10
申请号：US16865824
申请日：2020-05-04
申请人： NXP B.V.
发明人： Francesco Laghezza , Franz Lampel
IPC分类号： G01S7/00 , G01S7/35 , G01S13/931
摘要： A radar system is disclosed that provides joint object detection and communication capabilities. The radar system includes a communication signal generator that provides a communication signal, a pre-distortion module that applies a pre-distortion to the communication signal to provide a pre-distorted communication signal, a linear frequency modulation (LFM) signal generator that provides a LFM signal, and a mixer that mixes the pre-distorted communication signal onto the LFM signal to provide a radar signal to be transmitted by the radar system. The radar system further includes an all-pass filter that filters a plurality of de-ramped reflected images of the radar signal to provide a filtered signal. Each de-ramped reflected image includes an associated image of the pre-distorted communication signal. The all-pass filter provides a linear group delay, and a non-linear phase response. The pre-distortion is an inverse of the non-linear phase response of the all-pass filter.
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公开(公告)号：US11353549B2
公开(公告)日：2022-06-07
申请号：US16412693
申请日：2019-05-15
申请人： NXP B.V.
发明人： Feike Jansen , Francesco Laghezza
摘要： A data processing device and method for detecting interference in a FMCW radar system are described. For each of a plurality of transmitted chirps of the radar system, a high pass filter is applied to a receiver signal of a receiver channel of a radar receiver during an acquisition time corresponding to a transmitted chirp to remove those parts of the receiver signal corresponding to a reflected chirp having a power at the radar receiver greater than the noise power of the radar receiver of the radar system. The receiver signal power is calculated from the high pass filtered receiver signal. The receiver signal power is compared with a threshold noise power based on an estimate of the thermal noise of the radar receiver to determine whether the receiver signal corresponds to an interfered received chirp including interference or a non-interfered received chirp not including interference.
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公开(公告)号：US20200348389A1
公开(公告)日：2020-11-05
申请号：US16402932
申请日：2019-05-03
申请人： NXP B.V.
摘要： Aspects of the present disclosure are directed to radar apparatuses and methods involving the communication of data with radar signals. As may be implemented with one or more embodiments, a sequence of radar waveforms are transmitted as RF signals, the RF signals carrying communication data encoded onto a ramped radar carrier signal via phase-shift keying (PSK) modulation. Such modulation may utilize a modified, reduced-angle modulation with phase angles of less than π. Object-reflected versions of the RF signals are received and demodulated by deramping the received object-reflected versions of RF signals using a linearized version of the radar waveforms (e.g., without PSK modulation). This approach can mitigate compression peak loss.
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公开(公告)号：US11867827B2
公开(公告)日：2024-01-09
申请号：US16402932
申请日：2019-05-03
申请人： NXP B.V.
CPC分类号： G01S7/006 , G01S13/288
摘要： Aspects of the present disclosure are directed to radar apparatuses and methods involving the communication of data with radar signals. As may be implemented with one or more embodiments, a sequence of radar waveforms are transmitted as RF signals, the RF signals carrying communication data encoded onto a ramped radar carrier signal via phase-shift keying (PSK) modulation. Such modulation may utilize a modified, reduced-angle modulation with phase angles of less than π. Object-reflected versions of the RF signals are received and demodulated by deramping the received object-reflected versions of RF signals using a linearized version of the radar waveforms (e.g., without PSK modulation). This approach can mitigate compression peak loss.
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