Abstract:
An apparatus for updating fault detection thresholds is provided. The apparatus for updating the fault detection thresholds comprises: an environmental change detector for detecting a change in the signal reception environment; a controller for calculating a value of an environment change indicator based on the results of the reception environment of a detection signal and for requesting the update of a detection threshold which indicates whether correction information has a failure by determining a change in the reception environment of the signal; and a detection threshold updating unit for updating the detection threshold in response to the request.
Abstract:
The present invention discloses a long distance system capable of performing time synchronization with high precision at the minimum cost by transmitting/receiving a time synchronization signal using one of a power line and a communications line that are commonly installed and used between sub-systems constituting a predetermined long distance system, and a time synchronization method performed in the long distance system. The long distance system includes a control sub-system and a plurality of sub-systems. The control sub-system includes a control unit, an atomic clock, and a synchronization generator. The control unit corrects the time of the atomic clock using satellite navigation signals received through a satellite navigation, and the synchronization generator generates a time synchronization signal using time corrected of the atomic clock. Each of the sub-systems includes a time synchronization terminal that is connected with the control sub-system through at least one of the power line and the communications line and performs time synchronization using the time synchronization signal received through one of the power line and the communications line.
Abstract:
A dynamic state compensation system may include a speed detection unit which detects the speed of a first moving object; and a communications unit which transmits the location data of the dynamic state compensation system and the detected speed of the first moving object to the first moving object. Also, a positioning device which receives data from the dynamic state compensation system includes a GPS module which determines at least one among the location data and the speed data of the positioning device; and a communications unit which receives the location data of the dynamic state compensation system and the detected speed data of the positioning device from the dynamic state compensation system. The GPS module can compensate at least one among the location data and the speed data of the positioning device based on the location data of the dynamic state compensation system and the detected speed data of the positioning device received in the communications unit.
Abstract:
PURPOSE: A transmission method of GNSS(Global navigation satellite system) data for real time processing is provided to design a data format and a transmission priority determination method for real-time data transmission through a commercial wired network, thereby minimizing delay time in data processing and immediately delivering correction data to users. CONSTITUTION: A transmission method of GNSS data comprises the steps of: acquiring basic data by each base station(S100); and transmitting the basic data to a central station(S200). The basic data includes GNSS data which is transmitted from a plurality of GPSs; weather data which is acquired by each base station and the location data of each base station. The format of the data transmitted to the central station is organized with a preamble which indicates a beginning of a data packet, a time stamp, a receiving station ID which is identification of a base station, a packet ID, packet message data, an acquire data time which indicates the time when the base station acquired data, weather data, and a receiving station health flag which indicates whether the base station operates normally or not. The central station receives the data received according to the priority determined by a weighted fair queuing algorithm. [Reference numerals] (S100) Basic data acquisition step; (S200) Data transmission step
Abstract:
PURPOSE: A simulated signal generating system for disturbance signal generation source position tracking is provided to perform a simulated experiment for tracking the position of a disturbance signal generation source in an environment close to the real situation. CONSTITUTION: A simulated signal generating system for disturbance signal generation is as follows. Disturbance signal simulator controller(10) generates the positional information of a satellite navigation receiver(2) and the positional information of the disturbance signal generation source in real-time. Satellite navigation signal simulator(1) inputs the positional information of the satellite navigation receiver generated from a disturbance signal simulator controller(10), and generates the satellite navigation signal depending on the positional information of the satellite navigation receiver. A disturbance signal generation controller(20) calculates the frequency change, the attenuation ratio and the phase delay respectively using the positional information of the satellite navigation receiver generated from the satellite navigation disturbance signal simulator controller and disturbance signal generating source. A signal generator(30) generates the disturbing signal using the frequency change, the attenuation ratio and the phase delay calculated from the disturbing signal generation controller. A signal coupler(40) generates the satellite navigation signal including the disturbance signal by coupling the satellite navigation signal transmitted from the satellite navigation signal simulator and the disturbance signal transmitted from the signal generator. Satellite navigation signal receives the satellite navigation signal including the disturbance signal generated from the signal coupler. [Reference numerals] (10) Satellite navigation disturbance signal simulator controller; (20) Disturbance signal generation controller; (A1) Satellite navigation signal simulator 1; (A2) Satellite navigation signal simulator n; (B1) Signal generator 1; (B2) Signal generator n; (C1) Signal coupler 1; (C2) Signal coupler n; (D1) Satellite navigation receiver 1; (D2) Satellite navigation receiver n
Abstract:
PURPOSE: A positioning tracking method of multiple jammers based on a TDOA Method is provided to accurately detect each jammer location even in case of multiple jammers. CONSTITUTION: Multiple sensors receiving GPS signals are arranged and set as reference sensors in order to calculate TDOA. (S100) The estimates of multiple jammer locations are produced based on TDOA. (S200) The multiple estimates of location are displayed on the coordinate set up based on the sensors. (S300) When search cells and search ranges are determined, by moving as a searching interval, the search cell including all true position solutions as many as the number of sensors is searched out.(S400) The number of jammers is determined and the position solutions of jammers are calculated(S500). [Reference numerals] (S100) Step of calculating a TDOA measured value; (S200) Step of calculating a position value; (S300) Step of displaying a position value; (S400) Step of setting a searching range and of searching a searching cell; (S500) Step of estimating a position