892 results about "Single station" patented technology

A technique is disclosed involves a station (e.g., an IEEE 802.11 station, etc.) requesting that one or more frames be transmitted from an access point to the station. The station might have been in power save mode during Bluetooth operation for the purpose of causing the access point to queue frames that are intended for the station. The station making the request is collocated with the Bluetooth station or is, in fact, a single station that supports two protocols (i.e., has two parts), and is able to determine the regular timing of the Bluetooth synchronous connected oriented (SCO) packet transmissions. The requests to the access point for IEEE 802.11 frames are timed to cause the access point response frames to fall between the Bluetooth messages, thus managing potential interference.

The invention provides an optical measurement system and method for a three-dimensional shape of a large-scale complex curved surface member. The method is based on binocular optical grating projection measurement technologies, point cloud poses of all station positions during multiple station position measurement are obtained via a laser tracker and a corresponding target ball, point cloud obtained via the multiple station position measurement is converted to be under a unified laser tracker coordinate system according to corresponding pose data, and overall merging of point cloud data of a large-scale complex surface-shaped member can be realized; in the system, a six degree-of-freedom robot is used as a carrier for a point cloud space pose tracking unit and a binocular structured light measurement device, single station position measurement precision is ensured via calibration of the binocular structured light measurement device before measurement work starts, and data integrity and measurement efficiency are ensured via measurement route planning. Via the optical measurement system and method, all kinds of large-scale complex surface-shaped members can be accurately measured in non-contact conditions; practical, reliable and complete original three dimensional shape data can be provided for evaluation of all kinds of processing quality.

A method of processing a multicast frame in a wireless local area network (WLAN) and an apparatus supporting the method are provided. The method comprises receiving, at a station, a unicast frame from an access point (AP), the unicast frame including an unicast address indicating a single station which receives the unicast frame, receiving a multicast frame from the AP, the multicast frame including a group address indicating a group of stations which receives the multicast frame, determining whether the unicast frame is duplicated with the multicast frame, and discarding the multicast frame if the unicast frame is duplicated with the multicast frame.

The invention relates to a target localization and tracking system and a method. The system comprises a plurality of cluster localization modules and command control modules, each cluster localizationmodule comprises a plurality of sensor nodes and cluster head nodes, and each cluster head node comprises an initialization module, a particle filtration module, a particle weight calculation module,a re-sampling determination module and an estimation target state module. The method which combines Kalman and particle filtration is adopted for realizing the passive localization of a target, and the computation speed is far lower than the particle filtration method on the basis of realizing high-precision localization; the localization and the track of the target is finally realized by adopting multiple sensors and being based on the observation of the direction of the target, thereby being capable of overcoming the constraint that the traditional machine-mounted or ship-mounted single station system must carry out motorization during the observation period, having no need of observing the motorization of a platform, improving the flexibility of target localization, greatly increasingthe area of a region of target monitoring localization, avoiding the shortcoming of existence of localization blind regions and having very high effectiveness, accuracy and feasibility.

The invention discloses an ultrasonic ranging method, belonging to the technical field of electronic measurements. The ultrasonic ranging method comprises the following steps that: an ultrasonic transmitter and a pulse laser are located at a transmitting end, the transmitting end receives a measuring command, subsequently, the pulse laser triggers a beam of pulse laser and the ultrasonic transmitter triggers an ultrasonic wave at the same time, and phase locking is carried out on the triggered ultrasonic wave and an external clock source; an ultrasonic receiver and a photodiode are located at a receiving end, after the photodiode receives the pulse laser, a timer is started, after the ultrasonic receiver acquires the received ultrasonic wave, the timer is stopped to acquire transition time; the transition time multiplies by a revised sound velocity to acquire a rough measurement value of a measured distance; and a phase difference is obtained, a fine measurement part is lambda delta omega/2phi, and an actually measured distance d' is acquired, wherein d'=Nlambda+lambda delta omega/2phi. The ultrasonic ranging method has the advantages that the receiver is easily interfered by the transmitter, a measurement blind zone is greatly reduced, the ultrasonic distance measuring directivity is improved, the distance measuring precision is improved within one ultrasonic wavelength; and the ultrasonic ranging method is particularly suitable for distance measurement in a single station type space orientation and measurement system.

The invention discloses a lightning detection and positioning system and method, which relate to the technical field of meteorological detection. The system comprises an antenna unit, a receiver unit, a waveform characteristic extracting and processing unit and a monitoring and controlling unit, wherein the antenna unit is used for detecting an electromagnetic field variation signal while lightning happens, detecting a GPS satellite signal and transmitting the electromagnetic field variation signal and the GPS satellite signal to the receiver unit; the receiver unit is used for receiving the electromagnetic field variation signal and the GPS satellite signal; the waveform characteristic extracting and processing unit is used for extracting electromagnetic field variation signal waveform characteristic parameters in real time and analyzing the parameters to obtain a cloud ground flash identification result and a ground flash positioning result; and the monitoring and controlling unit is used for collecting and storing the waveform of the electromagnetic field variation signal in real time, marking the time of collecting the lightning waveform and displaying the position of the ground flash in a geographical information system in real time. The system and method disclosed by the invention, multifunctional single-station lightning detection and positioning of the lightning waveform collection and lightning strike-back positioning can be carried out.

The invention discloses a multipath utilization through-the-wall radar imaging method based on the Bayes compression perception. A single station single transceiving antenna frequency stepping radar system is used for emitting pulse strings in multiple positions parallel to a wall face and acquiring echo signals; compression sampling is performed on the echo signals by randomly measuring a matrix so as to obtain relatively few measurement signals; then, by combining a dictionary construction compression perception model designed based on the multipath reflection characteristics of the wall face, the Bayes compression perception is used for reconstructing information of scenes after the wall face from the measurement signals; and finally the reconstructed information is sued for finishing through-the-wall radar imaging. According to the invention, cost is reduced; recording time is shortened; by use of the Bayes compression perception technology, calculation speed is quite fast, and required observation data are quite few; and the precision of images obtained through combination of the multipath utilization method is quite high and occurrence of false shadows is effectively inhibited.

The invention discloses an automatic single-station glaze spraying device. The automatic single-station glaze spraying device comprises a spraying room, a feeding mechanism, a working rotary table and a robot body. The spraying room is a semi-closed space with the front end face provided with an opening. The feeding mechanism is arranged outside the spraying room. The working rotary table is installed inside the spraying room and matched with the end, stretching into the spraying room, of the feeding mechanism so that an object on which glaze spraying needs to be carried out can be taken down from the feeding mechanism. The robot body is arranged at the opening, a spray gun of the robot body stretches into the spraying room so that the glaze spraying operation can be carried out on the object on which glaze spraying needs to be carried out on the working rotary table. The invention further discloses an automatic single-station glaze spraying method. Glaze aerial fog produced in the spraying room is exhausted out of a workshop through a ventilation channel through the structure of the semi-closed spraying room and a suction opening and processed, and the operating environment of the workshop is improved.

The invention discloses a combined DOA and TOA single-station passive positioning method based on error correction. According to measurement information obtained by a receiving station of an externalradiation source radar system, by introducing an auxiliary variable, a nonlinear equation is converted into a pseudo-linear equation, a pseudo-linear model between the state of a target position and the state of an observation station position is established, an iterative least square method is adopted for estimation, a constrained total least square estimation model is constructed, a constrainedoptimization problem is converted into an unconstrained optimization problem, a Newton iteration method is used for optimization and solution, and the correlation between the auxiliary variable and the target position is used for constructing a correlation least square estimation model, so that the target positioning performance is further improved. The target positioning accuracy is improved through combined estimation of the target position and system errors. Convenience is provided for improving the target positioning performance, the complexity of error registration under the premise of ensuring the estimation performance is reduced, and good positioning performance in the case of large measurement noise is achieved.

An environmental condition detector emits only safe, validated verbal messages recorded in a user's voice to help occupants of a building respond safely to sensed environmental conditions. The message emitted in the user's voice is generally a familiar voice to other building occupants to better capture their attention, and only certain, safe, user messages are validated for use thereby eliminating the chance that the user may unknowingly record an unsafe message to be emitted during a sensed environmental condition. The verbal message is recorded by a user and is analyzed through speech recognition to determine if the user-recorded message can be validated as containing safe content. A user-recorded message found to match manufacturer preprogrammed message content is validated and selected to be audibly emitted in the user's voice when an environmental condition is sensed. Various embodiments include single station units, interconnected units, or centrally controlled security systems.

Cooperating mobiles (ground vehicles, aircraft) are located and identified by Multilateration and Automatic Dependent Surveillance-Broadcast (ADS-B) techniques using the frequency band and the format of the Secondary Surveillance Radar (SSR) signals in high traffic situations. Standard messages, transmitted by the mobile on the downlink channel, i.e. to a set of fixed receiving stations, and including the identification code, permit the location of the mobile by multiple time measurements (Multilateration) from a subset of the set of fixed receiving stations; when the message contains the position (GPS and, later, Galileo datum) the mobile may be located with the ADS-B when in view even of a few stations or of a single station. In order to overcome the problem that arises with high traffic, i.e. the superimposition of signals, called garbling.

The invention discloses an airborne single-station passive positioning method for multiple broadband targets and mainly solves the problem that multiple broadband radiation source targets cannot be subjected to single-station passive positioning in the prior art. The method comprises the following implementation steps: (1) sampling a far-field broadband radiation source signal at the receiving end to obtain an observation signal; (2) performing band narrowing on a broadband observation signal received by an array element through FRFT; (3) building a signal vector I(k) of a k-th signal in an FRFT domain; (4) obtaining a time average autocorrelation matrix for the k-th signal by utilizing the signal vector I(K), and performing eigen value decomposition; (5) building a guide matrix in a distance form of the k-th signal; (6) performing sampling at the receiving end for L times, repeatedly executing the steps of (2) to (5), and searching a target function for a maximum value, wherein (xk,yk,zk) corresponding to a maximum value point serves as the coordinates of a target k. According to the airborne single-station passive positioning method for the multiple broadband targets, the multiple broadband radiation source targets can be subjected to single-station passive positioning. The method can be used for detecting and reconnoitering an unmanned flight platform and a manned flight platform.

The invention discloses a Beidou wide area timing system and method. The Beidou wide area timing method comprises the following steps: obtaining a phase observation value and a pseudo-range observation value of a China Beidou satellite navigation system of each ground Beidou tracking station network, time difference monitoring data of the time of the China Beidou satellite navigation system and the Beijing time of a laboratory atomic clock group, a satellite ephemeris of the China Beidou satellite navigation system, earth rotation and antenna phase center parameters; performing preprocessing of data check, gross error elimination and cycle slip detection on the obtained data; performing error model correction and fine data processing on the preprocessed data; encoding the corrected data togenerate a telegraph text, and uploading the telegraph text to a communication satellite for broadcasting; and performing, by a user, non-difference precise timing solution and time difference parameter correction on the received corrected data and the local observation data to obtain a user local time consistent with the standard time. By adoption of the Beidou wide area timing system and methoddisclosed by the invention, single-station wide area timing service can be achieved, the timing precision is high, the operability is high and the action range is limited.

An ADS-S control workstation data processing system is provided, which comprises an input data processing module, a single ground station tracking module and a multiple ground station tracking module. The input data processing module preprocesses the input ADS-B message and sends corresponding alarming information to mistaken message; the single ground station tracking module processes the status message data, mode message data, service message in each single station ADS-B message, establishes the track of each single station according to the starting point of track and maintains the ADS-B track linked list of single station via track renewal and termination; the multiple ground station tracking module tracks a plurality of ADS-B ground stations according to the established single ADS-B track, ensures the overload protection for system capacity, establishes a multiple ADS-B system track for each object according to the starting point of track and maintains the ADS-B track linked list of single station via track renewal and termination. Therefore, the invention aims at ADS-B processing and lowers down the complexity for processing.

The invention discloses a method and device for positioning a GNSS receiver. The method includes calculating the pseudorange single difference between two satellites according to the obtained pseudorange original observation value; calculating the inter-satellite and inter-epoch double-difference observation value according to the obtained carrier phase original observation value of the carrier phase; calculating the doppler single-difference observation value between the two satellites according to the doppler observation value of the GNSS receiver; and estimating the position information of the GNSS receiver according to the pseudorange single difference, the carrier phase original observation value of the carrier phase, and the doppler single-difference observation value obtained through calculation. By means of a single-station positioning, the high positioning precision, simple operation and low cost are achieved being independent from extra satellite orbit, satellite dock error correction or other external data and without the need for extra reference station to provide differential data.

The invention discloses an integrated real-time correction system for atmosphere convection layer and ionized layer radio wave refraction errors, which comprises a microwave radiometer, a single-station GPS (Global Positioning System) and an integrated real-time correction unit, wherein the microwave radiometer is used for detecting a convection layer refractivity profile; the single-station GPS is used for detecting an ionized layer electron density profile in real time; and the integrated real-time correction unit is used for calculating radio wave refraction error corrections in real time by adopting a ray tracing method based on the convection layer refractivity profile, the ionized layer electron density profile and the apparent distance and the apparent elevation angle parameter of a detection target, wherein the radio wave refraction error corrections comprise a distance error correction, an elevation angle error correction and a speed error correction. The integrated real-time correction device for atmosphere convection layer and ionized layer radio wave refraction errors overcomes the defect that the parameters of a convection layer and an ionized layer cannot be simultaneously detected by adopting the traditional method, realizes the real-time correction of the radio wave refraction errors of the convection layer and the ionized layer, has the advantages of high accuracy, good real-time performance, unattended operation, strong mobility, low cost, simplicity in operation and the like, and provides a technical support for improving the accuracy of systems for aerial survey, deep-space survey, ballistic trajectory measurement and the like in China.

The invention relates to a single-station welding and dust exhausting device which comprises a dust air return port (1), a dust backflow pipe (2), an active filter cotton placing box (3), a draft fan (4) and a switch (8) and is characterized in that the dust air return port (1) is located above a welding workpiece (6) and connected with the upper end of the active filter cotton placing box (3) through the dust backflow pipe (2), the lower end of the active filter cotton placing box (3) is connected with the draft fan (4), and the draft fan (4) is fixed on a welding clamp base surface (5). The single-station welding and dust exhausting device enables a dedusting device and a welding clamp to be effectively combined, greatly reduces manufacture cost, saves space, and simultaneously improves operation environments of staff.

The invention discloses a single-station user terminal locating method and a system. The method comprises that position information of a plurality of known points in a community is obtained, the position information comprises a signal reaching angle, time advance and longitude and latitude information; information of the signal reaching angle and the time advance of a point to be located is obtained; at least one known point with the signal reaching angle and the time advance most approximate to the signal reaching angle and the time advance of the point to be located is found according to the position information of the known point; and the longitude and latitude information of the point to be located is calculated according to the longitude and latitude information of at least one found known point. According to the single-station user terminal locating method, at least one known point near to the point to be located is found, and longitude and latitude of the point to be located are calculated through the longitude and latitude of at least one known point. The single-station user terminal locating method can solve the problem that a traditional locating method is not accurate caused by multi-diameter or non-direct waves, and can locate accurately under the condition of many obstacles including buildings and the like.