A method for improving the accuracy of measuring a distance to an object using a wireless communication signal and an electronic device therefor the same are provided. The method includes transmitting a wireless communication signal to an external object by controlling a wireless communication module, receiving a signal returned based on the transmitted wireless communication signal being reflected from the external object by controlling the wireless communication module, acquiring a first distance to the external object based on a transmission time point of the transmitted signal and a reception time point of the received signal, acquiring a second distance to the external object based on phases of the transmitted signal and the received signal by controlling the phase matching module, and estimating a distance to the external object based on the first distance and the second distance.

The present invention provides a method and a device for measuring a distance between wireless nodes, the method comprises: performing, by a first wireless node I and a second wireless node R, a preset measurement of a phase difference in a preset half-duplex communication mode, based on a first operating frequency and a second operating frequency synchronously changed multiple times, to determine a first phase difference H.sub.0 and a second phase difference H.sub.1; and determining a distance between the first wireless node I and the second wireless node R by performing a differential operation of the first phase difference H.sub.0 and the second phase difference H.sub.1. According to the above method, there is no need for transceivers of the first wireless node I and the second wireless node R to work simultaneously, and a distance between wireless nodes may also be measured for the transceivers working in the half-duplex mode.

A method of tracking objects using a radar, includes sending a beamcode to at least one radar antenna to set a predetermined direction, using samples from a random distribution of at least one of a phase or an amplitude to generate a tracking signal pulse train, transmitting the pulse train from the at least one antenna within a pulse time window, receiving return signals from objects at the at least one antenna, and using the return signals to gather data to track the objects. A radar system has at least one radar antenna to transmit a tracking signal, a memory to store a set of random distributions, a controller connected to at least one radar antenna and the memory, the controller to execute instructions to determine which random distribution to use, generate a pulse train using the random distribution, transmit the pulse train to the at least one radar antenna as the tracking signal, and gather measurement data about objects returning signals from the tracking signal.

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 . 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.

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 . 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.

A system for generating a pulse. In some embodiments, the system includes a processing circuit configured: to reverse the sign of a first group of two consecutive bits of a binary code word; to calculate three phase change bits, of a plurality of phase change bits, according to (1).sup.n k(n)/k(n1) wherein k(n) is the n.sup.th bit of the binary code word, n being a positive integer ranging from 2 to 4, and to generate a phase modulation function for a pulse including a sequence of consecutive chips.

The present disclosure provides a radar apparatus including: an antenna including a first transmitting antenna, a second transmitting antenna, and a receiving antenna; a transmitter including a first modulator for generating a first transmission signal having an inverted phase of a source signal and transmitting the first transmission signal through the first transmitting antenna, and a second modulator for generating a second transmission signal having a shifted phase of the source signal and transmitting the second transmission signal through the second transmitting antenna; a receiver for receiving a reflection signal of the first transmission signal and the second transmission signal reflected from the object through the receiving antenna; and a controller for obtaining information for the object based on the reflection signal. According to the present disclosure, it is possible to efficiently detect the object using the antenna having a simple structure.

Methods, devices, and systems are disclosed for treating patients with ultrasound targeted at regions of the brain. An ultrasound transducer is positioned on a patient's head to target a region of the patient's brain for ultrasound therapy. An ultrasound wave is emitted at the target region of the patient's brain. At least partially concurrently, a fMRI imaging device generates real time images of activity in the patient's brain, for example by ASL protocol, BOLD protocol, or a combination thereof. Activity in the patient's brain caused by the ultrasound wave is detected, typically a distance from the target region. The transducer is repositioned or reoriented to correct for and better target the region, and another series of ultrasound waves are directed at the target region with improved accuracy.

A system for estimating a distance between vehicles may include an oscillator, a transmitter, a receiver, a summing circuit, a signal analyzer, a tunable phase shifter, a distance estimator, and/or a vehicle identifier. The oscillator may generate a generated oscillating signal, transmitted by the transmitter. The receiver may receive a processed signal derived by a system of a second vehicle. The summing circuit may add the generated oscillating signal to the received signal to produce the updated oscillating signal. The signal analyzer may detect a spike in amplitude associated with the updated oscillating signal. The tunable phase shifter may shift a phase of the generated oscillating signal by an incremental phase shift amount until a spike in amplitude is detected. The distance estimator may estimate the distance between the first vehicle and the second vehicle based on a total phase shift amount and the predetermined wavelength.

Method and MIMO radar apparatus using correlated motion decomposed from reflectance data of multiple time frames to enhance discriminatory capacity in imaging. Such imaging has application in tracking temporal patterns of respiratory and cardiac activities in addition to recognition of targets within non-stationary environments.