Abstract:
A position estimating method for estimating a position of a radio wave source is disclosed. The position estimating method according to an embodiment of the present invention comprises the steps o: acquiring a first information based on a Time Difference of Arrival method of a radio wave which is transmitted from the radio wave source and a second information based on an Angle of Arrival method of the radio wave; determining initial conditions of the Time Difference of Arrival method on the basis of the second information; and estimating the position of the radio wave source based on the determined initial condition and the first information.
Abstract:
An antenna platform according to an embodiment of the present invention comprises a mast which includes an antenna pole, on which an antenna is installed, therein, vertically supports the antenna pole, and adjusts a vertical position of the antenna; and a bottom plate which is detachably coupled with the mast, fixes the mast, and adjusts a horizontal position of the antenna. A bottom portion of the bottom plate is opened, such that a position of the antenna pole is acknowledged and a preset reference point on a ground is aligned with a center of the antenna. A block mounting unit, on which a block with much load to prevent a vertical and horizontal movement is mounted, is formed on the bottom plate. According to the present invention, a user is allowed to simplify a product by easily assembling and disassembling components, and portability is improved. Also a moving unit is installed on the bottom plate, such that mobility of a product is improved. Weight is added on the bottom plate by the block, such that a derailment of position is prevented and stability of the product is enhanced. An observer is allowed to observe the antenna pole directly through the opened lower portion of the bottom plate, and the center of the antenna pole is easily aligned with the reference point on the ground, such that the antenna platform is easily installed on an accurate position. The antenna platform is easily installed on the same position as an initial installation position, when reinstalled, so as to improve reliability of the product.
Abstract:
PURPOSE: A structure for installing a multiple data receiver for a satellite navigation is provided to stably receive a navigation signal by installing horizontal control members on a support base and a satellite navigation receiving module. CONSTITUTION: First to third pillars (20A,20B,20C) are vertically installed on the upper surface of a support base (10). A navigation signal receiving module (30) receives satellite navigation data. A weather data receiving module (40) receives weather data. A reinforcement unit (50) is installed on the outer surfaces of the first to third pillars and connects the first to third pillars.
Abstract:
PURPOSE: A position measuring method of an unknown signal source based on TDOA(time difference of arrival) is provided to reduce influence of a sampling cycle, thereby accurately finding the position of the unknown signal source. CONSTITUTION: A position measuring method of an unknown signal source based on TDOA comprises the following steps: An unknown signal is received from multiple sensors (S100). A cross correlation on the discrete delay time is performed for the obtained signal, the value of cross correlation is obtained, and the value of target function is calculated (S200). A reference sensor is chosen to produce a TDOA measured value (S300). A delay time cross correlation is performed for each received signal in the chosen sensor and another sensor, and the time when the cross correlation value is maximum is calculated (S400). The position of the unknown signal source is measured by using the TDOA measured value (S500). [Reference numerals] (S100) Step of obtaining data; (S200) Step of calculating the value of a target function; (S300) Step of selecting a reference sensor; (S400) Step of calculating a TDOA measured value; (S500) Step of measuring a position
Abstract:
PURPOSE: A standard deviation setting method of a global navigation satellite system(GNSS) pseudo range correction value is provided to accurately estimate a user location error level and performance of an integrity monitoring algorithm. CONSTITUTION: The location of a navigation satellite is calculated from a received signal from each navigation satellite. An elevation angle of each navigation satellite is acquired based on the location of a receiver(S100). A standard deviation of a pseudo range correction value according to the elevation angle is calculated using a navigation signal measurement value collected from each navigation satellite(S200). A standard deviation which considers view error control effects is created from the standard deviation of the pseudo range correction value and the elevation angle with respect to the navigation satellite(S300). The standard deviation which considers the view error control effects with respect to the navigation satellite is inputted as an input value of an integrity monitoring algorithm(S400). A broadcasting message receives the standard deviation of the pseudo range correction value(S500).
Abstract:
PURPOSE: An accident prevention apparatus of an articulated vehicle using an identifier and image detecting system is provided to reduce a big accident and prevent an accident in advance by distinguishing an arrangement state of a wrecker and wrecked car. CONSTITUTION: An accident prevention apparatus of an articulated vehicle using an identifier and image detecting system comprises an identifier(10), an image detection system, and a screen display unit. The identifier comprises a lighting-emitting unit(11), a lighting control board(12), and a protective film(13). The lighting-emitting unit is mounted in the upper part of a wrecked car to be identified outside. The light control board controls lighting on/off of the lighting-emitting unit. The protective film is installed in the wrecked car to be detached, thereby having the same color. The image detecting system comprises an image recording unit and image date process unit. The screen display unit displays an arrangement state of a wrecker and the wrecked car by output data from the image data unit.
Abstract:
본 발명은 차량 사고 분석 시스템에 관한 것으로, 본 발명에 따른 시스템은, 위성으로부터 수신한 GPS 신호의 반송파 성분과 기준국으로부터 수신한 GPS 신호의 반송파 성분을 차분하여 구해지는 차량의 위치 정보 및, 도로상의 차선 정보를 포함하는 전자 지도를 저장하는 저장부와, 차량 위치 정보와 전자 지도의 차선 정보를 이용하여 차량의 주행 차선을 결정하고, 결정된 주행 차선에 대한 정보를 저장부에 저장시키는 제어부 및, 위성으로부터 수신한 GPS 신호의 반송파 성분과 기준국으로부터 수신한 GPS 신호의 반송파 성분을 차분하여 차량의 위치 정보를 구하는 GPS 수신부를 포함하는 블랙박스, 그리고 차량에 대한 제원 정보, 차량 사고 부위 정보 및 블랙 박스에 저장된 차량 주행 차선 정보를 입력받아 사고 원인 분석을 수행하는 사고 분석 장치를 포함한다. 본 발명에 의하면, 차선 인식이 가능한 정확도를 가지는 반송파 기반의 차분된 GPS 정보(DGNSS)를 이용하여 주행 차량의 사고 분석을 객관적으로 정확하게 할 수 있다. GPS, 반송파, 블랙박스, 기준국, 차선
Abstract:
PURPOSE: A method and an apparatus for generating pseudo range correction information are provided to generate correct pseudo range correction information by using an improved method and apparatus. CONSTITUTION: A plurality of receivers receive pseudo range correction values of satellite navigation signals(S310). A B-Value for each receiver is obtained on the pseudo range correction values(S320). A weight value for each receiver is obtained by using the B-value(S330). The pseudo range correction of the satellite navigation signal is generated by using a multiplication of the weight value and the correction value(S340).
Abstract:
PURPOSE: A navigation device and a driving lane discrimination method thereof are provided to enable accurate discrimination of a lane, where a vehicle is travelling, using satellite navigation information and digital map data transmitted from a navigation satellite and a central station. CONSTITUTION: A driving lane discrimination method of a navigation device is as follows. The location of a vehicle is calculated based on a satellite signal including carrier wave received from a navigation satellite and correction information received from central station(S110). The driving direction of the vehicle is determined using the lane information of the vehicle and location information stored in a digital map in order to reduce the range of lane division by half(S120). The distances of horizontal direction between the vehicle and the center line of each land within the reduced range are calculated(S130). The lane corresponding to the minimum distance among the calculated distances is determined as the driving lane of the vehicle(S140).