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公开(公告)号：US20230094118A1
公开(公告)日：2023-03-30
申请号：US17486435
申请日：2021-09-27
发明人： Karthik Subburaj , Sandeep Rao
IPC分类号： G01S7/35 , G01S13/931 , G01S13/58
摘要： An apparatus comprises processor cores and computer-readable mediums storing machine instructions for the processor cores. When executing the machine instructions, the processor cores obtain received signals for transmitted chirps from a radar sensor circuit. Each transmitted chirp comprises an A chirp segment, a time gap, and a B chirp segment, respectively. The processor cores sample the received signals to obtain sampled data matrices M1(A) for the A chirp segments and M1(B) for the B chirp segments. The processor cores perform a first Fourier transform (FT) on each column of M1(A) and M1(B) to obtain velocity matrices M2(A) and M2(B), respectively. The processor cores apply a phase compensation factor to M2(B) to obtain a phase corrected velocity matrix M2(B′), and concatenate M2(A) and M2(B′) to obtain an aggregate velocity matrix M2(A&B′). The processor cores perform a second FT on each row of M2(A&B′) to obtain a range and velocity matrix M3(A&B′).
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公开(公告)号：US11579284B2
公开(公告)日：2023-02-14
申请号：US17068976
申请日：2020-10-13
摘要： A radar system is provided that includes transmission signal generation circuitry, a transmit channel coupled to the transmission generation circuitry to receive a continuous wave test signal, the transmit channel configurable to output a test signal based on the continuous wave signal in which a phase angle of the test signal is changed in discrete steps within a phase angle range, a receive channel coupled to the transmit channel via a feedback loop to receive the test signal, the receive channel including an in-phase (I) channel and a quadrature (Q) channel, a statistics collection module configured to collect energy measurements of the test signal output by the I channel and the test signal output by the Q channel at each phase angle, and a processor configured to estimate phase and gain imbalance of the I channel and the Q channel based on the collected energy measurements.
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公开(公告)号：US11579282B2
公开(公告)日：2023-02-14
申请号：US17843069
申请日：2022-06-17
IPC分类号： G01S13/28 , G06F17/14 , G01S7/41 , G01S13/536 , G01S13/34 , G01S7/35 , G01S13/931 , G06F17/13 , H04N5/232
摘要： A radar system is provided that includes a radar transceiver integrated circuit (IC) configurable to transmit a first frame of chirps, and another radar transceiver IC configurable to transmit a second frame of chirps at a time delay ΔT, wherein ΔT=Tc/K, K≥2 and Tc is an elapsed time from a start of one chirp in the first frame and the second frame and a start of a next chirp in the first frame and the second frame, wherein the radar system is configured to determine a velocity of an object in a field of view of the radar system based on first digital intermediate frequency signals generated responsive to receiving reflected chirps of the first frame and second digital IF signals generated responsive to receiving reflected chirps of the time delayed second frame, wherein the maximum measurable velocity is increased by a factor of K.
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公开(公告)号：US11513190B2
公开(公告)日：2022-11-29
申请号：US16428576
申请日：2019-05-31
摘要： Methods, apparatus, systems and articles of manufacture are disclosed to test RADAR integrated circuits. A radar circuit comprising a local oscillator (LO), a transmitter coupled to the LO and configured to be coupled to a transmission network, a receiver configured to be coupled to the transmission network, and a controller coupled to the LO, the transmitter, and the receiver, the controller to cause the LO to generate a frequency modulated continuous waveform (FMCW), cause the transmitter to modulate the FMCW as a modulated FMCW, cause the transmitter to transmit the modulated FMCW via the transmission network and the receiver to obtain a received FMCW from the transmission network, and in response to obtaining the received FMCW from the receiver, generate a performance characteristic of the radar circuit based on the received FMCW.
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公开(公告)号：US20220326368A1
公开(公告)日：2022-10-13
申请号：US17843069
申请日：2022-06-17
IPC分类号： G01S13/28 , G06F17/14 , G01S7/41 , G01S13/536 , G01S13/931 , G01S13/34 , G01S7/35
摘要： A radar system is provided that includes a radar transceiver integrated circuit (IC) configurable to transmit a first frame of chirps, and another radar transceiver IC configurable to transmit a second frame of chirps at a time delay ΔT, wherein ΔT=Tc/K, K≥2 and Tc is an elapsed time from a start of one chirp in the first frame and the second frame and a start of a next chirp in the first frame and the second frame, wherein the radar system is configured to determine a velocity of an object in a field of view of the radar system based on first digital intermediate frequency signals generated responsive to receiving reflected chirps of the first frame and second digital IF signals generated responsive to receiving reflected chirps of the time delayed second frame, wherein the maximum measurable velocity is increased by a factor of K.
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公开(公告)号：US11460543B2
公开(公告)日：2022-10-04
申请号：US16836836
申请日：2020-03-31
IPC分类号： G01S7/35 , G01S7/40 , G01S13/931 , G01S13/34
摘要： A radar system is provided that includes a receive channel including a complex baseband and a processor coupled to the receive channel to receive a first plurality of digital intermediate frequency (IF) samples from an in-band (I) channel of the complex baseband and a corresponding second plurality of digital IF samples from a quadrature (Q) channel of the complex baseband, wherein the processor is configured to execute instructions to compute at least one failure metric based on the first plurality of digital IF samples and the second plurality of digital IF samples.
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公开(公告)号：US20220196824A1
公开(公告)日：2022-06-23
申请号：US17132857
申请日：2020-12-23
发明人： Sandeep Rao , Karthik Subburaj
摘要： A radar system is provided and includes a radar transceiver integrated circuit (IC) and a processor coupled to the radar transceiver IC. The radar transceiver IC includes a chirp generator configured to generate a plurality of chirp signals and a phase shifter configured to induce a signal phase shift. The radar transceiver IC is configured to transmit a frame of chirps based on the plurality of chirp signals and generate a plurality of digital signals, each digital signal corresponding to a respective reflection received based on the plurality of chirp signals. The processor is configured to control the phase shifter to induce the signal phase shift in a first subset of chirp signals of the plurality of chirp signals and determine a phase shift induced in the first subset of chirp signals by the phase shifter based on the digital signal.
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公开(公告)号：US11137476B2
公开(公告)日：2021-10-05
申请号：US16120129
申请日：2018-08-31
发明人： Brian Paul Ginsburg , Karthik Subburaj , Karthik Ramasubramanian , Sachin Bhardwaj , Sriram Murali , Sandeep Rao
IPC分类号： G01S7/35 , G01S7/02 , G01S7/40 , G01S13/32 , G01S13/931
摘要： A frequency modulated continuous wave (FMCW) radar system is provided that includes a receiver configured to generate a digital intermediate frequency (IF) signal, and an interference monitoring component coupled to the receiver to receive the digital IF signal, in which the interference monitoring component is configured to monitor at least one sub-band in the digital IF signal for interference, in which the at least one sub-band does not include a radar signal.
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公开(公告)号：US20210026005A1
公开(公告)日：2021-01-28
申请号：US17068976
申请日：2020-10-13
摘要： A radar system is provided that includes transmission signal generation circuitry, a transmit channel coupled to the transmission generation circuitry to receive a continuous wave test signal, the transmit channel configurable to output a test signal based on the continuous wave signal in which a phase angle of the test signal is changed in discrete steps within a phase angle range, a receive channel coupled to the transmit channel via a feedback loop to receive the test signal, the receive channel including an in-phase (I) channel and a quadrature (Q) channel, a statistics collection module configured to collect energy measurements of the test signal output by the I channel and the test signal output by the Q channel at each phase angle, and a processor configured to estimate phase and gain imbalance of the I channel and the Q channel based on the collected energy measurements.
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公开(公告)号：US10809353B2
公开(公告)日：2020-10-20
申请号：US16114490
申请日：2018-08-28
发明人： Karthik Subburaj , Karthik Ramasubramanian , Sriram Murali , Sreekiran Samala , Krishnanshu Dandu
IPC分类号： G01S13/00 , G01S7/292 , G01S13/88 , G01S7/35 , G01S13/34 , G01S7/03 , G01S7/02 , G01S7/41 , G01S13/04
摘要： A noise-mitigated continuous-wave frequency-modulated radar includes, for example, a transmitter for generating a radar signal, a receiver for receiving a reflected radar signal and comprising a mixer for generating a baseband signal in response to the received radar signal and in response to a local oscillator (LO) signal, and a signal shifter coupled to at least one of the transmitter, LO input of the mixer in the receiver and the baseband signal generated by the mixer. The impact of amplitude noise or phase noise associated with interferers, namely, for example, strong reflections from nearby objects, and electromagnetic coupling from transmit antenna to receive antenna, on the detection of other surrounding objects is reduced by configuring the signal shifter in response to an interferer frequency and phase offset.
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