Dan Wang

US Patent:

20220342036, Oct 27, 2022

Filed:

Jul 1, 2022

Appl. No.:

17/856109

Inventors:

- Dallas TX, US
Karthik Subburaj - Bangalore, IN
Dan Wang - Allen TX, US
Adeel Ahmad - Richardson TX, US

International Classification:

G01S 7/35
G01S 13/42
G01S 13/92
G01S 13/34

Abstract:

In accordance with described examples, a method determines if a velocity of an object detected by a radar is greater than a maximum velocity by receiving on a plurality of receivers at least one frame of chirps transmitted by at least two transmitters and reflected off of the object. A velocity induced phase shift (φ) in a virtual array vector S of signals received by each receiver corresponding to a sequence of chirps (frame) transmitted by each transmitter is estimated. Phases of each element of virtual array vector S are corrected using φto generate a corrected virtual array vector S. A first Fourier transform is performed on the corrected virtual array vector Sto generate a corrected virtual array spectrum to detect a signature that indicates that the object has an absolute velocity greater than a maximum velocity.

US Patent:

20220206109, Jun 30, 2022

Filed:

Sep 20, 2021

Appl. No.:

17/479002

Inventors:

- Dallas TX, US
Adeel AHMAD - Plano TX, US
Dan WANG - Allen TX, US
Murtaza ALI - Cedar Park TX, US

International Classification:

G01S 7/35
G01S 13/34
G01S 13/931

Abstract:

An apparatus, including processing unit (PU) cores and computer readable storage devices storing machine instructions for determining a distance between a target object and a radar sensor circuit. The PU cores receive a beat signal generated by the radar sensor circuit and compensate for a phase difference between the received beat signal and a reconstruction of the received beat signal to obtain a phase compensated beat signal. The phase compensated beat signal is then filtered to remove spurious reflections by demodulating the phase compensated beat signal using an estimated frequency of the phase compensated beat signal. The PU cores then apply a low pass filter to the demodulated phase compensated beat signal, resulting in a modified beat signal. The PU cores then determine the distance between the target object and the radar sensor circuit using the modified beat signal.

US Patent:

20230072441, Mar 9, 2023

Filed:

Sep 3, 2021

Appl. No.:

17/466867

Inventors:

- Dallas TX, US
Sandeep RAO - Bangalore, IN
Dan WANG - Allen TX, US

International Classification:

G01S 7/02
G01S 13/58

Abstract:

In an example, a method is implemented in a radar system. The method may include transmitting, via transmission channels, a frame of chirps, the chirps transmitted having a programmed frequency offset that is a function of a transmission channel of the transmission channels that is transmitting the frame of chirps, receiving, via a receive channel, a frame of reflected chirps, the reflected chirps comprising the chirps reflected by an object within a field of view of the radar system, and determining a Doppler domain representation of the frame of reflected chirps having a Doppler domain spectrum that includes multiple spectrum bands, the object represented in at least a portion of the spectrum bands based on the reflected chirps, wherein the programmed frequency is configured to cause the Doppler domain spectrum to include a number of spectrum bands greater than the number of transmission channels.

US Patent:

20200304141, Sep 24, 2020

Filed:

Jun 12, 2020

Appl. No.:

16/899632

Inventors:

- Dallas TX, US
Dan Wang - Allen TX, US

International Classification:

H03M 7/30
G06F 13/28
G06F 17/16
G06N 3/063

Abstract:

A matrix compression/decompression accelerator (MCA) system/method that coordinates lossless data compression (LDC) and lossless data decompression (LDD) transfers between an external data memory (EDM) and a local data memory (LDM) is disclosed. The system implements LDC using a 2D-to-1D transformation of 2D uncompressed data blocks (2DU) within LDM to generate 1D uncompressed data blocks (1DU). The 1DU is then compressed to generate a 1D compressed superblock (CSB) in LDM. This LDM CSB may then be written to EDM with a reduced number of EDM bus cycles. The system implements LDD using decompression of CSB data retrieved from EDM to generate a 1D decompressed data block (1DD) in LDM. A 1D-to-2D transformation is then applied to the LDM 1DD to generate a 2D decompressed data block (2DD) in LDM. This 2DD may then be operated on by a matrix compute engine (MCE) using a variety of function operators.

US Patent:

20200292687, Sep 17, 2020

Filed:

Mar 27, 2020

Appl. No.:

16/832073

Inventors:

- Dallas TX, US
Dan Wang - Dallas TX, US
Muhammad Zubair Ikram - Richardson TX, US

International Classification:

G01S 13/34
G01S 7/35

Abstract:

In the proposed low complexity technique a hierarchical approach is created. An initial FFT based detection and range estimation gives a coarse range estimate of a group of objects within the Rayleigh limit or with varying sizes resulting from widely varying reflection strengths. For each group of detected peaks, demodulate the input to near DC, filter out other peaks (or other object groups) and decimate the signal to reduce the data size. Then perform super-resolution methods on this limited data size. The resulting distance estimations provide distance relative to the coarse estimation from the FFT processing.

US Patent:

20200209352, Jul 2, 2020

Filed:

Mar 10, 2020

Appl. No.:

16/814531

Inventors:

- Dallas TX, US
Karthik Subburaj - Bangalore, IN
Dan Wang - Allen TX, US
Adeel Ahmad - Richardson TX, US

International Classification:

G01S 7/35
G01S 13/42
G01S 13/92
G01S 13/34

Abstract:

In accordance with described examples, a method determines if a velocity of an object detected by a radar is greater than a maximum velocity by receiving on a plurality of receivers at least one frame of chirps transmitted by at least two transmitters and reflected off of the object. A velocity induced phase shift (φ) in a virtual array vector S of signals received by each receiver corresponding to a sequence of chirps (frame) transmitted by each transmitter is estimated. Phases of each element of virtual array vector S are corrected using φto generate a corrected virtual array vector S. A first Fourier transform is performed on the corrected virtual array vector Sto generate a corrected virtual array spectrum to detect a signature that indicates that the object has an absolute velocity greater than a maximum velocity.

US Patent:

20190178987, Jun 13, 2019

Filed:

Nov 27, 2018

Appl. No.:

16/201726

Inventors:

- Dallas TX, US
Adeel AHMAD - Plano TX, US
Dan WANG - Allen TX, US
Murtaza ALI - Cedar Park TX, US

International Classification:

G01S 7/35
G01S 13/34

Abstract:

An apparatus, including processing unit (PU) cores and computer readable storage devices storing machine instructions for determining a distance between a target object and a radar sensor circuit. The PU cores receive a beat signal generated by the radar sensor circuit and compensate for a phase difference between the received beat signal and a reconstruction of the received beat signal to obtain a phase compensated beat signal. The phase compensated beat signal is then filtered to remove spurious reflections by demodulating the phase compensated beat signal using an estimated frequency of the phase compensated beat signal. The PU cores then apply a low pass filter to the demodulated phase compensated beat signal, resulting in a modified beat signal. The PU cores then determine the distance between the target object and the radar sensor circuit using the modified beat signal.

US Patent:

20180279884, Oct 4, 2018

Filed:

Sep 27, 2017

Appl. No.:

15/717756

Inventors:

- Dallas TX, US
Dan Wang - Allen TX, US
June Chul Roh - Allen TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

A61B 5/0205
A61B 5/00

Abstract:

A mm-wave system includes transmission of a millimeter wave (mm-wave) signal by a plurality of transmitters to multiple objects, and receiving of return-mm-wave signals from the multiple objects by a plurality of receivers. A processor is configured to perform an algorithm to derive complex-valued samples and angle measurements from each receiver to identify one object from another object. The processor further extracts signal waveforms that correspond to each object and process the extracted signal waveforms to estimate breathing rate and heart rate of the identified object.