Abstract:
본 발명은 실내 무선 측위를 위한 핑거프린트 데이터베이스 자동 생성 방법에 관한 것이다. 이를 위하여 본 발명은 다수의 액세스 포인트로부터 전송되는 신호의 세기 산출 방식을 결정하고, 실내 공간에 설정된 다수의 수직 격자와 수평 격자의 교점 각각에 대한 신호 세기를 산출한 후, 교점의 위치 정보와 산출된 신호 세기를 이용하여 데이터베이스 테이블을 생성하는 핑거프린트 데이터베이스 생성 방법을 제공한다. 또한, 본 발명은 하나 이상의 액세스 포인트 및 수신 단말과의 통신을 수행하는 통신 모듈; 세기 산출 방식을 이용하여 특정 위치에 대한 신호 세기를 계산함으로써, 핑거프린트 데이터베이스 테이블을 생성하는 환경 분석 모듈; 및 핑거프린트 데이터베이스 테이블을 저장하는 핑거프린트 데이터베이스를 포함하는 환경 분석 장치를 제공한다. 본 발명에 따르면, 핑거프린트 데이터베이스 구축을 위한 시간 및 인력을 절감할 수 있으며, 실내 구조가 변경되더라도 새로운 핑거프린트 데이터베이스를 용이하게 구축할 수 있는 효과가 있다. 무선 측위, 핑거프린트, 데이터베이스
Abstract:
A method of automatic generation of fingerprint database for indoor radio determination at low cost is provided to develope database and reduce a time and a worker for developing database by using an environment analysis tool. A signal strength calculating formula produces signal intensity transmitted from an AP(Access Point) more than one installed at indoor space(S210). A plurality of vertical lattices and horizontal gratings are set up in the indoor space(S220). The signal intensity received from AP is calculated in each intersection point of the horizontal grating and vertical lattice(S230). A fingerprint data base table is generated by using the location information of the intersection point and the signal strength of AP(S240).
Abstract:
Provided is an apparatus for estimating virtual axis geomagnetic data using a 2-axis geomagnetic sensor and an inclinometer, including a geomagnetic data normalizing unit for normalizing 2-axis geomagnetic data measured by the 2-axis geomagnetic sensor, a tilt angle calculator for calculating a tilt angle of the 2-axis geomagnetic sensor by using tilt information measured by the inclinometer, and a virtual axis geomagnetic data estimator for determining a magnitude of virtual geomagnetic data with respect to a virtual axis by using the normalized 2-axis geomagnetic data, and determining a sign of the virtual geomagnetic data based on the normalized 2-axis geomagnetic data, the calculated tilt angle and a dip angle to thereby estimate the virtual geomagnetic data.
Abstract:
The present invention relates to a head-up display apparatus for a vehicle and a method thereof, comprising an information analysis unit for collecting and analyzing vehicle status information, driver status information, driving environment state information, driver sight information, and driver individual and general information from a plurality of information collection units attached to the vehicle; a first information determining unit for determining a priority over the vehicle status information, the driver status information, and the driving environment state information; a second information determining unit for determining a visibility range of a driver based on the driver sight information, and the driver individual and general information; and an information exposing unit for changing and exposing the information which is exposed to the driver on the basis of the priority and the visibility range of the driver.
Abstract:
The precise advance calibration process cannot be always performed in a general vehicle, and the angular misalignment cannot also be maintained to be stable for a long time due to shakes of the vehicle, etc. Therefore, the automatic calibration is required to be performed at regular time intervals or when an event such as a shock, etc. occurs. According to an embodiment of the present invention, provided is the technology of automatically, in-situ, calibrating the angular misalignment of the mounted cameras by using lots of stopped objects in the surrounding of the road while the vehicle is driven. Specifically, provided is a method for automatically calibrating the angular misalignment of the mounted cameras, which is required to precisely convert, to a vehicle coordinate system, real-time safe driving subsidiary information in the surrounding of the vehicle, such as the vehicle, a pedestrian, and a lane, etc. obtained by a single or multiple cameras mounted in the vehicle.
Abstract:
PURPOSE: A receiving signal detecting method and a satellite navigation receiving detecting device for implementing the same are provided to increase the signal detection probability in given false alarm probability by adding the verification procedure about the correlation result in a signal detection process. CONSTITUTION: A verification unit detects a parallel signal(S101). A correlation matrix produced through the detection procedure is saved(S103). The verification unit decides the unusual condition of the saved correlation value(S105). According to the decision result, a detection unit declares signal absence(S107). According to the decision result, a selecting unit selectively saves the candidate cell for the correlation value verification(S109). The verification unit is created the inside demodulation signal by using the information of each cell included in the candidate cell. The verification unit performs the correlation at the time area(S111). The verification unit compares the result of the non-coherent accumulation with the verification critical value which is defined in advance(S113). The detection unit declares false alarm(S115). The detection unit declares signal presence(S117).
Abstract:
PURPOSE: A wireless position finding signal producing device and a method thereof are provided to improve distance performance of the wireless position finder using a non-linear chirp signal. CONSTITUTION: A signal producing unit(130) produces a wireless position finding signal based on a chirp signal in which the frequency change rate according to the time is non-linear. A signal control unit(110) decides the frequency change rate with the sum total of the reference frequency and the trigonometrical function pitching with the reference frequency within the frequency band of the chirp signal and frequency band.