摘要:
An apparatus for generating location information transmits an SUPL INIT message for measuring a location to a target terminal so as to position the target terminal. The target terminal transmits an SUPL POS INIT message including RFID tag information to the apparatus. The apparatus determines a positioning method of the target terminal by using RFID tag information, generates the location of the target terminal according to the determined positioning method, and transmits the location to a service user.
摘要:
Provided are an integrated navigation apparatus and a method for providing navigation information using the same. The integrated navigation apparatus includes a first filter, a second filter, a mode probability updating unit, a first navigation information calculating unit, a second navigation information calculating unit, a fusion unit and a navigation information fusion unit.
摘要:
Provided is an indoor wireless positioning system and method including: a signal receiving unit receiving first signals from wireless communication access points and measuring strengths of the received first signals and a position estimating unit estimating a current position by comparing the strengths of the first signals measured by the signal receiving unit with a table recording strengths of second signals predicted by a simulation for indoor space the system is currently positioned. Accordingly, it is possible to rapidly and accurately create a fingerprint database and calculate position information on the terminal in the terminal or the server on the basis of the database information.
摘要:
A radar tracking apparatus and method are provided. The radar tracking apparatus includes an α-β tracking filter, wherein the α-β tracking filter includes: a tracking index unit calculating a tracking index for obtaining α and β filter gains of an α-β tracking filter, based on changes in the measurement error covariance of a radar-measured value that occur when the measured value of target is converted from a polar coordinate system to a rectangular coordinate system; and a filter gain update unit calculating the variations of α and β filter gains, based on the partial differential coefficient of the changing rate of the α and β filter gains with respect to the changing rate of the tracking index and the variations of the tracking index, and updating the α and β filter gains.
摘要:
Provided are an integrated navigation apparatus and a method for providing navigation information using the same. The integrated navigation apparatus includes a first filter, a second filter, a mode probability updating unit, a first navigation information calculating unit, a second navigation information calculating unit, a fusion unit and a navigation information fusion unit.
摘要:
The present invention relates to a method of automatically generating a fingerprint database for indoor wireless location. For this purpose, the present invention provides a method of generating a fingerprint database that determines a method of calculating the strength of signals transmitted from a plurality of access points, calculates the strength of signals at nodes of a plurality of vertical and horizontal grids set in an indoor space, and generates a database table by using the location information about the nodes and the calculated strength of the signals. Further, the present invention provides an environment analysis tool including a communication module that performs communication between at least one of the access points and a receiving terminal, an environment analysis module that calculates the strength of a signal at a specific location by using a method of calculating strength and generates a fingerprint database table, and a fingerprint database that stores the fingerprint database table. According to the present invention, it is possible to reduce time and manpower required to build a fingerprint database, and to easily build a new fingerprint database even though an indoor structure is changed.
摘要:
A radar tracking apparatus and method are provided. The radar tracking apparatus includes an α-β tracking filter, wherein the α-β tracking filter includes: a tracking index unit calculating a tracking index for obtaining α and β filter gains of an α-β tracking filter, based on changes in the measurement error covariance of a radar-measured value that occur when the measured value of target is converted from a polar coordinate system to a rectangular coordinate system; and a filter gain update unit calculating the variations of α and β filter gains, based on the partial differential coefficient of the changing rate of the α and β filter gains with respect to the changing rate of the tracking index and the variations of the tracking index, and updating the α and β filter gains.
摘要:
An environment analysis system for indoor wireless location by using locations of a plurality of access points (AP) includes, a first environment analysis tool (10) for receiving indoor environment information for indoor wireless location, performing a simulation for calculating location accuracies, performing a simulation for relocating and/or additionally installing the access points (AP), and displaying results of the simulation; and a second environment analysis tool (20) for receiving wireless communications signals from the access points (AP), calculating distances from the second environment analysis tool (20) to the access points (AP), calculating a location of the second environment analysis tool (20), calculating errors in the distances and in the location calculated, and providing the errors calculated to the first environment analysis tool (10). The first environment analysis tool (10) corrects errors in the simulations performed thereby by using the errors received from the second environment analysis tool (20), and then repeats the simulations and the displaying process.
摘要:
A method and apparatus for acquiring a refined carrier frequency by optimizing search areas are provided. The apparatus for acquiring a refined carrier frequency by optimizing search areas includes: a refined signal generation unit using a coarse carrier frequency and a coarse code phase extracted from a digitized signal and obtaining a refined carrier frequency approximated to the carrier frequency of an original signal from which the digitized signal is obtained by conversion; and a refined carrier frequency searching unit setting and providing a search area in which the refined signal acquisition unit can obtain the refined carrier frequency based on the coarse carrier frequency. According to the method and apparatus, as a result of the searching method reducing a search time, acquisition of a refined carrier frequency as well as fast acquisition of a signal is enabled, thereby allowing a precise initial value to be provided to a signal tracking unit.
摘要:
Provided is a fingerprint database generating method and device for wireless location. Signal strength is estimated by using access points on a numerical map, position coordinates of grid points, and a radio wave attenuation model so as to generate a fingerprint database. A simulation error is computed based on actual survey data measured in the real space, and the estimated signal strength is corrected by using the computed simulation error to thus generate a fingerprint database.