Example embodiments relate to methods for distance determination. One embodiment includes a method for determining a distance between a first radio signal transceiver and a second radio signal transceiver. The method includes receiving a first set and a second set of measurement results. The first set is acquired by the first radio signal transceiver based on signals transmitted from the second radio signal transceiver and the second set is acquired by the second radio signal transceiver based on signals transmitted from the first radio signal transceiver. The first set is representable as including, for each of a plurality of frequencies, a measurement pair. The method also includes calculating, for each frequency of the plurality of frequencies, a preliminary estimate of a value proportional to a one-way frequency domain channel response. Additionally, the method includes determining a final estimate of the value proportional to the one-way frequency domain channel response.

Disclosed are a method and an apparatus for determining time of arrival, a signal receiving device, and a non-transitory computer readable storage medium. The method for determining time of arrival includes: generating time of arrival correction information according to front edge information of theoretical autocorrelation waveforms of positioning signals having different fading values; calculating a front edge slope corresponding to a front edge reference point of a correlation waveform of an actually received signal; and determining target correction information from the time of arrival correction information according to the front edge slope, and determining the time of arrival of the actually received signal based on the target correction information.

An electronic device is provided. The electronic device includes an antenna and an ultra wide band (UWB) communication circuit connected with the antenna. The UWB communication circuit is configured to filter a positioning signal received from the antenna into a specified band to be converted into a digital signal, generate a UWB packet including a first field associated with synchronization and a second field associated with security, obtain a first channel impulse response corresponding to the first field and a second channel impulse response corresponding to the second field, when the UWB packet is valid based on the second field, obtain a third channel impulse response, when there is a correlation between the first channel impulse response and the second channel impulse response, and measure a distance to the external electronic device based on the third channel impulse response.

An electronic device is provided. The electronic device includes an antenna and an ultra wide band (UWB) communication circuit connected with the antenna. The UWB communication circuit is configured to filter a positioning signal received from the antenna into a specified band to be converted into a digital signal, generate a UWB packet including a first field associated with synchronization and a second field associated with security, obtain a first channel impulse response corresponding to the first field and a second channel impulse response corresponding to the second field, when the UWB packet is valid based on the second field, obtain a third channel impulse response, when there is a correlation between the first channel impulse response and the second channel impulse response, and measure a distance to the external electronic device based on the third channel impulse response.

A system and method for proximity determination can include receiving an RF signal transmitted from a target location, the receiving performed by an antenna of an autonomous moving device, extracting received signal strength indicator (RSSI) values by processing the received RF signal, receiving distance measurements provided by a sensor associated with the autonomous moving device and storing the distance measurements in the memory of the autonomous device. The extracted RSSI values can be correlated the with the distance measurements to obtain a proximity value. A distance to the target location can be determined based on the proximity values.

A system and method for one-way ranging is disclosed. The system comprises a transmitter, also referred to as a tag, transmitting a first frequency in a first frequency group. The receiver, also referred to as the locator, receives the first frequency and measures the phase at a first point in time. At a later time, the transmitter switches to a second frequency, which is close in frequency to the first frequency so as to also be part of the first frequency group. The receiver also switches to the second frequency. The receiver then measures the phase of the second frequency at a second point in time. The transmitter and receiver then repeat this sequence for a second frequency group. The four phase measurements are used to determine the distance from the transmitter to the receiver. In this way, improved accuracy may be achieved by having a large separation between the first frequency group and the second frequency group.

A system and method for one-way ranging is disclosed. The system comprises a transmitter, also referred to as a tag, transmitting a first frequency in a first frequency group. The receiver, also referred to as the locator, receives the first frequency and measures the phase at a first point in time. At a later time, the transmitter switches to a second frequency, which is close in frequency to the first frequency so as to also be part of the first frequency group. The receiver also switches to the second frequency. The receiver then measures the phase of the second frequency at a second point in time. The transmitter and receiver then repeat this sequence for a second frequency group. The four phase measurements are used to determine the distance from the transmitter to the receiver. In this way, improved accuracy may be achieved by having a large separation between the first frequency group and the second frequency group.

Illustrative methods and systems may determine whether a rideshare is verified based on received rideshare data. A verification code may be assigned to a rideshare trip. The verification code may be provided to a rider of the rideshare trip. The verification code may be received by a vehicle device assigned to the rideshare trip via user input or communication from the rider device. Whether the rider has entered the correct vehicle for the rideshare trip may be verified based on the verification code assigned to the rideshare trip and the verification code received by the rideshare vehicle.

A security system includes a portable terminal, a communication device communicating with the portable terminal, and a determination unit determining validity of the portable terminal. Phase data acquired from distance measuring radio wave is used to determine validity of communication between the portable terminal and the communication device. The received phase data of the distance measuring radio wave varies according to the distance from a transmission source. When the communication device and the portable terminal are fixed, and the communication device and the portable terminal have transmitted and received distance measuring radio waves having the same specific frequency, vehicle acquisition phase data and terminal acquisition phase data are the same. The determination unit determines, by using this two types of phase data, the validity of communication between the communication device and the portable terminal is determined.

A distance estimation device includes: a portable terminal; a communication device; a distance estimation unit estimating a distance between the portable terminal and the communication device; and a phase determination unit. The communication device determining a phase shift amount from a reference phase following a predetermined generating rule and generates measuring data by applying the determined phase shift amount. The phase determination unit determines a distance estimation phase for distance estimating purpose. The distance estimation unit adopts an estimated distance when a difference between the estimated distances respectively calculated based on at least two sets of combinations of the distance estimation phases is within a predetermined range.