This disclosure relates to systems and methods for measuring wave fields of a body of water. A system can include a radiation source and an antenna that can cooperate with the radiation source to transmit a radio frequency (RF) signal to a wave field having one or more waves. The antenna can receive backscattered signals from the wave field. The system can include a local oscillator and a processor. The local oscillator downconverts the backscattered signals into baseband signals and the processor can process the baseband signals to determine a relative velocity of each of the waves of the wave field. The processor can further be programmed to identify an observed portion of the backscattered signals as bad data and remove the bad data from further processing.

A radar device is mounted on a vehicle, which is a moving object, and includes a doppler correction phase-rotation controller and a phase rotator. Based on the speed of the vehicle, the doppler correction phase-rotation controller calculates a Doppler correction phase-rotation amount for correcting a Doppler frequency due to movement of the vehicle. By using the Doppler correction phase-rotation amount, the phase rotator pre-corrects Doppler frequency components with respect to a radar transmission signal in each transmission interval of the radar transmission signal.

Systems and methods are disclosed to determine an unambiguous radial velocity for weather phenomena using weather radar that is not limited by the Doppler Dilemma. Some embodiments include transmitting a complex waveform and using the returned electromagnetic signal to determine the unambiguous radial velocity.

A sensor system and method of using the system synergistically to improve the accuracy and usefulness of measured results is described. The system is comprised of electronically linked components that act as markers to trigger events, producers that gather data from sensors and aggregators that combine the data from a plurality of producers using triggers from marker devices to select the data of interest. The system is shown to be applicable to selection of data regions of interest and to analysis of the data to improve accuracy. The analysis of the data of any particular sensor within the system makes use of extrinsic data, being data generated by other sensors and intrinsic data, that is data or data limits that are known to be true from nature, laws of physics or just the particular information the user wants to acquire. The system is demonstrated on the analysis of Doppler radar measurements of a thrown object.

A radar apparatus includes a radar transmitter and a radar receiver. The radar receiver includes sampling circuitry, correlation calculation circuitry, a plurality of adder circuitry, a plurality of Doppler frequency analysis circuitry and Doppler frequency correction circuitry. The Doppler frequency correction circuitry, which in operation, (i) determines whether or not a folding in a Doppler frequency included in a reflected wave signal is present according to an amplitude difference or phase difference between two of peak spectra of results of analyses performed by the plurality of Doppler frequency analysis circuitry, and (ii) makes a correction to the Doppler frequency included in a reflected wave signal on the basis of the results of the analyses in a case it is determined that the folding is present.

Gas spring sensors including a millimeter wave radar source and a target surface disposed in spaced relation to the radar source. The sensors also include a millimeter wave radar receptor operable to generate a signal upon receiving the radar waves reflected off the target surface. The radar source is operable to direct millimeter-length radar waves of a frequency greater than or equal to 120 gigahertz (GHz) and a wavelength of 2.5 millimeters or less toward the target surface. A processor is communicatively coupled with the radar source and the radar receptor, and is operable to determine a displacement and a relative velocity using pulsed Doppler or continuous wave frequency modulation radar methods that rely on time of flight and frequency phase shifts of pulsed or continuous radar waves. Gas spring assemblies including such sensors, and suspension systems including one or more of such gas spring assemblies are also included.

A method for determining golf shot characteristics includes detecting, in imaging data captured by an imager, a signature of a golf shot launched from a first launch area, a field of view of the imager including one of the first launch area and an area adjacent to the first launch area, and determining, from the imaging data, first golf shot characteristics, the first shot characteristics including a first launch location and a first launch time in combination with determining whether the first launch location and the first launch time correspond to a second launch location and a second launch time for second golf shot characteristics determined from sensor data captured by a further sensor arrangement and when no correspondence is found between the first and second launch locations and the first and second launch times, transmitting the first shot characteristics to a display at the first launch location.

The present disclosure is directed to motion detection and recognition using segmented data from reflections of transmitted signals. An apparatus includes a transmitter, a receiver, and a processor. The processor may cause the transmitter to transmit pulses of an RF signal, the reflections of which are received by a receiver. For each of a number of consecutive segments, the transmitter may transmit N pulses of the RF signal, followed by quiet period. The processor may determine amplitude and phase data for reflections received by the receiver. Over a number of consecutive segments, the processor may detect and classify the amplitude and phase data change over time.

A radio frequency (RF) system includes a radar monolithic microwave integrated circuit (MIMIC), which includes: a phase detector including a test input port, and a monitoring input port, wherein the phase detector is configured to generate an output signal that represents a phase difference between a test signal received at the test input port and a monitoring signal received at the monitoring input port; a test signal path including at least one active component, the test signal path configured to receive a local oscillator signal and provide the local oscillator signal as the test signal to the test input port during a first measurement interval; and a passive signal path configured to receive the local oscillator signal and provide the local oscillator signal to the monitoring input port as the monitoring signal during the first measurement interval.

A detection device includes a transmitter for outputting an impulse signal and a receiver for receiving and processing a reflected signal obtained by reflecting the impulse signal from a target. The receiver includes a sample and extension unit that samples a received signal and extends a duration of a value obtained by sampling the received signal to form an extended signal extended to a frequency lower than a frequency of the reflected signal.