Methods, apparatus, systems and articles of manufacture are disclosed to improve Doppler velocity estimation. An example apparatus is disclosed including a transmitter to transmit a first sweep signal at a first position in a first block of time during a transmit time sequence pattern, and transmit a second sweep signal at a second position in a second block of time during the transmit time sequence pattern, the second position different than the first position. The example apparatus also includes a velocity analyzer to determine a velocity and a direction of arrival of a target object identified during the transmit time sequence pattern.

Methods, apparatus, systems and articles of manufacture are disclosed to improve Doppler velocity estimation. An example apparatus is disclosed including a transmitter to transmit a first sweep signal at a first position in a first block of time during a transmit time sequence pattern, and transmit a second sweep signal at a second position in a second block of time during the transmit time sequence pattern, the second position different than the first position. The example apparatus also includes a velocity analyzer to determine a velocity and a direction of arrival of a target object identified during the transmit time sequence pattern.

A radio detection and ranging (radar) operating apparatus includes: radar sensors configured to receive signals reflected from an object; and a processor configured to generate Doppler maps for the radar sensors based on the reflected signals and estimate a time difference between the radar sensors based on the generated Doppler maps.

A system and method for satellite imaging are provided. The system includes a first satellite, a trailing satellite, and a ground terminal. The first satellite acquires synthetic aperture radar (SAR) image data in a first predetermined signal frequency band at a first imaging location and transmits the SAR image data to a ground terminal. The ground terminal determines a second imaging location from the SAR image data and transmits the second imaging location to the trailing satellite. The trailing satellite acquires higher resolution image data in a second predetermined signal frequency band at the second imaging location and transmits the image data to the ground terminal. Systems and methods for satellite imaging are also provided in which a first satellite captures image data and processes the image data onboard to generate a processed product which is transmitted to a receiving terminal at a ground terminal or on a second satellite.

A system and method for satellite imaging are provided. The system includes a first satellite, a trailing satellite, and a ground terminal. The first satellite acquires synthetic aperture radar (SAR) image data in a first predetermined signal frequency band at a first imaging location and transmits the SAR image data to a ground terminal. The ground terminal determines a second imaging location from the SAR image data and transmits the second imaging location to the trailing satellite. The trailing satellite acquires higher resolution image data in a second predetermined signal frequency band at the second imaging location and transmits the image data to the ground terminal. Systems and methods for satellite imaging are also provided in which a first satellite captures image data and processes the image data onboard to generate a processed product which is transmitted to a receiving terminal at a ground terminal or on a second satellite.

An automated vehicle radar system capable of self-calibration includes an antenna, a transceiver, and a controller. The antenna broadcasts a radar-signal and detects a reflected-signal reflected by an object. The transceiver determines a distance, an angle, and a range-rate of the object relative to the antenna based on the radar-signal and the reflected-signal. The controller determines a speed of a host-vehicle; determines when the object is stationary based on the speed, the angle, and the range-rate; stores in a memory a plurality of detections that correspond to multiple instances of the distance, the angle, and the range-rate as the host-vehicle travels by the object; selects an ideal-response of angle versus range-rate based on the speed; determines a calibration-matrix of the system based on a difference between the plurality of detections and the ideal-response; and adjusts an indicated-angle to a subsequent-object in accordance with the calibration-matrix.

An automated vehicle radar system capable of self-calibration includes an antenna, a transceiver, and a controller. The antenna broadcasts a radar-signal and detects a reflected-signal reflected by an object. The transceiver determines a distance, an angle, and a range-rate of the object relative to the antenna based on the radar-signal and the reflected-signal. The controller determines a speed of a host-vehicle; determines when the object is stationary based on the speed, the angle, and the range-rate; stores in a memory a plurality of detections that correspond to multiple instances of the distance, the angle, and the range-rate as the host-vehicle travels by the object; selects an ideal-response of angle versus range-rate based on the speed; determines a calibration-matrix of the system based on a difference between the plurality of detections and the ideal-response; and adjusts an indicated-angle to a subsequent-object in accordance with the calibration-matrix.

An interference signal detection method, apparatus, integrated circuit, radio device and terminal are disclosed, wherein, the method includes: transmitting a target signal based on a radar, receiving N frames of echo signals, obtaining N pieces of 2D FFT plane information according to the N frames of echo signals, wherein any piece of 2D FFT plane information includes power information corresponding to a range and a velocity, and detecting whether an echo signal is interfered according to accumulated power information corresponding to the range gate in the piece of 2D FFT plane information. In this way, the interference is characterized by the accumulated power information, which has good robustness and simple operations, and can achieve low power consumption of the radar system.

An interference signal detection method, apparatus, integrated circuit, radio device and terminal are disclosed, wherein, the method includes: transmitting a target signal based on a radar, receiving N frames of echo signals, obtaining N pieces of 2D FFT plane information according to the N frames of echo signals, wherein any piece of 2D FFT plane information includes power information corresponding to a range and a velocity, and detecting whether an echo signal is interfered according to accumulated power information corresponding to the range gate in the piece of 2D FFT plane information. In this way, the interference is characterized by the accumulated power information, which has good robustness and simple operations, and can achieve low power consumption of the radar system.

An embodiment method includes: receiving radar data at a millimeter-wave radar sensor, the radar data being generated in response to an incident radio-frequency signal reflecting off an object located in a field of view of the millimeter-wave radar sensor; filtering the radar data to generate a first-filtered signal; determining a trajectory of motion corresponding to the first-filtered signal; and determining whether the trajectory of motion corresponds to a human signature, the human signature being associated with a respective operation of a vehicle.