Localization systems and methods for transmitting timestampable localization signals from anchors according to one or more transmission schedules. The transmission schedules may be generated and updated to achieve desired positioning performance. For example, one or more anchors may transmit localization signals at a different rate than other anchors, the anchor transmission order can be changed, and the signals can partially overlap. In addition, different transmission parameters may be used to transmit two localization signals at the same time without interference. A self-localizing apparatus is able to receive the localization signals and determine its position. The self-localizing apparatus may have a configurable receiver that can select to receive one of multiple available localization signals. The self-localizing apparatuses may have a pair of receivers able to receive two localization signals at the same time. A bridge anchor may be provided to enable a self-localizing apparatus to seamlessly transition between two localization systems.

Implementations of a method of detecting a plurality of radio pulses may include, using a signal processor, combining at least three pulses included in radio data collected over a first time interval by a directional antenna coupled with a software defined radio coupled with a unmanned aerial vehicle (UAV), the UAV coupled with a base station including the signal processor; determining a detected time for each of the at least three pulses in the first time interval; using the detected time for each of the at least three pulses, predicting a future time for each of at least three future pulses; and, using the software defined radio and directional antenna, listening for each of the at least three future pulses in radio data over a second time interval.

A system comprising a first apparatus, a second apparatus and a third apparatus, wherein the first apparatus is configured to provide, to a second apparatus, information regarding a number of antennas and/or an oversampling factor; the second apparatus is configured to transmit a plurality of beams in accordance with the information received from the first apparatus regarding the number of antennas and the oversampling factor; the third apparatus configured to receive a plurality of beamformed reference signals transmitted by the second apparatus, obtain measurement results for at least two of the plurality of beamformed reference signals, wherein the measurement results comprise one or more of: reference signal received power value, beam identifier, a value indicating uncertainty of the accuracy of the reference signal received power value; and transmit the measurement results to the second apparatus; and wherein the second apparatus is further configured to: process the received measurement results to obtain information regarding a position of the third apparatus and to transmit the obtained information regarding the position of the third apparatus to the first apparatus; and wherein the first apparatus is further configured to receive further measurement results from at least one further apparatus in addition to the second apparatus and to determine the location of the third apparatus based on the received measurement results and the received further measurement results.

Techniques are provided for positioning of a mobile device in a wireless network using directional positioning reference signals (PRS), also referred to as PRS beamforming. In an example method, a plurality of directional PRSs are generated for at least one cell for a base station, such that each of the plurality of directional PRSs comprises at least one signal characteristic and a direction of transmission, either or both of which may be distinct or unique. The plurality of directional PRSs is transmitted within the at least one cell, such that each of the plurality of directional PRSs is transmitted in the direction of transmission. A mobile device may acquire and measure at least one of the directional PRSs which may be identified using the associated signal characteristic. The measurement may be used to assist position methods such as OTDOA and ECID and to mitigate multipath.

A microwave-based radio system for realising a precise landing approach (MLS), characterised in that an azimuth antenna transmitter and/or an elevation signal transmitter and/or a DME transmitter, and preferably all three said transmitters, are placed aboard an unmanned aerial vehicle, and in particular on a drone. The object of the disclosure is also a method for realising a precise landing approach using such a system.

In many applications such as automobiles on busy highways, if a lot of vehicles on road are equipped with Doppler radars to help improve driving safety, no matter human-driven or auto-driven, if the radars use same frequency band, avoiding interference between them is a hard task. Assigning distinct frequencies is one of the solutions, however not only it wastes expensive spectrum resource, but also the task itself to dynamically assign frequency to vehicles randomly come together becomes a hard one to do. The disclosed invention of Doppler group radar will allow radar devices to work together using shared frequency band without interfering one another, without sacrificing performance, and without much increase in costs.

A mobile electronic device includes a wireless communications interface configured to receive, from a remote device, a sequence of remote device proximity indicators. The sequence of remote device proximity indicators indicate positions of the remote device. A mobile proximity detector of the mobile electronic device is configured to monitor a current position and a current velocity of the mobile electronic device; determine, from the sequence of remote device proximity indicators, a current remote device position and current remote device velocity; and determine, using at least the current remote device position and velocity, and the current position and the current velocity of the mobile electronic device, a likelihood of close contact between a user of the mobile electronic device and the remote device. A notification manager of the mobile electronic device is configured to notify the user of the likelihood of close contact.

A device (10) is placed on an object (30). A reference feature of the object (30) is aligned with a reference feature of the device (10). Based on signals transmitted between at least one measurement point of the device (10) and a further device (20), a position of the at least one measurement point is measured. The position of the object (30) is then determined based on the measured position of the at least one measurement point and based on information on arrangement of the at least one measurement point in relation to the reference feature of the device (10).

A method for transmitting a bit sequence to be transmitted at a frequency f.sub.b. A set of codes is determined in advance, wherein each code is associated with a possible value from a block of N.sub.b bits, and each code includes an ordered set of N.sub.s binary symbols intended to be transmitted at a frequency f.sub.s. The method includes splitting the bit sequence into N blocks of N.sub.b bits, the frequency f.sub.s and the numbers N and N.sub.b being selected such that N.sub.s×f.sub.b=N×N.sub.b×f.sub.s, associating a code with each of the N blocks according to the value from the blocks, interleaving the binary symbols of the N codes respectively corresponding to the N blocks of bits to be transmitted, the interleaved binary symbols being transmitted at a frequency f.sub.c such that N×f.sub.s=f.sub.c.

The present invention provides a range-finding method, apparatus, system, and non-transitory computer-readable storage medium. The method includes: acquiring a predicted number of interrupts of a single-chip microcomputer; acquiring a to-be-measured signal; triggering a first output of a comparator according to a strength of the to-be-measured signal and a preset trigger threshold; recording an ultrasonic signal and acquiring an actual number of interrupts according to the first output; and adjusting the trigger threshold according to the predicted number of interrupts and the actual number of interrupts, where the adjusted trigger threshold is used to trigger the first output next time. The trigger threshold of the comparator can be adaptively adjusted according to the number of interrupts to adjust sensitivity of recording the ultrasonic signal, so as to adapt to different measurement environments and ranges, accurately record an arrival time of the ultrasonic signal, and improve the accuracy of a range-finding result.