Abstract:
An external method for addressing the trainer-unique functions in a flight training system allows a Control Display Navigation Unit (CDNU), loaded with an actual Operational Flight Program (OFP), to function properly in a Flight Simulator environment of a trainer system without sacrificing the trainer-unique functions. A CDNU Trainer Interface Unit (CTIU) is defined to realize the external method. The CTIU is installed between the CDNU and the trainer system. The communication between the CDNU with an OFP and the trainer system is thus controlled by the CTIU. The trainer-unique functions are controlled externally by the CTIU, thus eliminating an OTP in the CDNU. The CTIU connects the CDNU and the trainer system. It communicates with both the trainer system and the CDNU/OFP using two sets of MIL-STD-1553B Buses. To the CDNU/OFP, it acts like the real navigation and communication systems. To the trainer system, it acts like a CDNU OTP. The CTIU will be able to address the trainer-unique functions with no modification to the OFP and CDNU hardware. The functions of the Operational Training Program (OTP) will be realized by the CTIU external to the CDNU/OFP. The CTIU activates OTP-equivalent capabilities upon receipt of OTP active commands from the trainer system.
Abstract:
A micro inertial measurement unit, which is adapted to apply to output signals proportional to rotation and translational motion of a carrier, respectively from angular rate sensors and acceleration sensors, is employed with MEMS rate and acceleration sensors. Compared with a conventional IMU, the processing method utilizes a feedforward open-loop signal processing scheme to obtain highly accurate motion measurements by means of signal digitizing, temperature control and compensation, sensor error and misalignment calibrations, attitude updating, and damping control loops, and dramatically shrinks the size of mechanical and electronic hardware and power consumption, meanwhile, obtains highly accurate motion measurements.
Abstract:
A fully-coupled vehicle positioning method and system with differential GPS substantially solves problems encountered in either the global positioning system-only or the inertial novigation system-only, such as loss of global positioning satellite signal, sensitivity to jamming and spoofing, and an inertial solution's drift over time, in which the velocity and acceleration from an inertial navigation processor of the integrated GPS/INS system are used to aid the code and carrier phase tracking of the global positioning system satellite signals, so as to enhance the performance of the global positioning and inertial integration system, even in heavy jamming and high dynamic environments. To improve the accuracy of the integrated GPS/INS navigation system, phase measurements are used and the idea of the differential GPS is employed. A master-slave relative positioning scheme is invented and is effective for high accuracy formation driving and flight.
Abstract:
A method of transmitting position data via cellular communication system includes the steps of receiving position data from a position producer, attaching the position data to a location registration data stream, and sending the position data along with the location registration data to a base station. This method takes advantages of the existing location updating procedure in a cellular network system to transmit precision position data of a mobile station. It does not need a dialing up to transmit position data. By utilizing this method, the position data of the mobile station can be delivered to the base station or cellular network whenever the mobile station is powered on.
Abstract:
A real-time IMU emulation method for GNC method includes the step of receiving real-time flight data from a 6DOF flight simulator and generating simulated IMU electronic signals according to the IMU measurement modules and error modules defined by the user, and injecting said simulated IMU electronic signals into an on-board GNC system which causes the on-board GNC system into “thinking” that the vehicle is really moving. The on-board GNC system which is installed on the vehicle is motionless during the emulation test, so that the testing can be carried out in a laboratory or in an anechoic chamber facility and the IMU emulation can achieve the easy, effective, and least intrusive injection of emulated IMU signals into the INS computer. The present invention has features supporting the final integration of a developmental Guidance, Navigation, or Control (GNC) system installed into a vehicle. It assures testers that GNC avionics on-board vehicle work properly before and during a flight test. It also helps to debug on-board GNC avionics and verify system performance.
Abstract:
A full fusion positioning method, which can be implemented in the existing hardware, but is more amenable to the emerging wafer-scale integration hardware, comprises the steps of injecting a global positioning system signal received by a global positioning system antenna and a predicted pseudorange and delta range from a data fusion, and converting and tracking said global positioning system signal to obtain pseudorange and delta range measurement and errors of said pseudorange and delta range measurement, which are passed to said data fusion; receiving a vehicle angular rate and an acceleration signal/data from an inertial measurement unit and solving inertial navigation equations for obtaining a referencing navigation solution, including position, velocity, and attitude, which are passed to a data fusion; and fusing said pseudorange and delta range measurement and said errors of said pseudorange and delta range measurement of said global positioning system and said referencing navigation solution to obtain predicted pseudorange and delta range, optimal estimates of said referencing navigation solution errors and inertial sensor errors, and optimal position information.
Abstract:
A real-time IMU simulator for an Inertial Measurement Unit (IMU) of an installed avionics system of a vehicle includes a 6DOF flight simulator; an IMU computer; and a 6DOF(Degree of Freedom) interface. The 6 DOF interface is connected between the 6DOF flight simulator and the IMU computer for transferring flight trajectory data from the 6DOF flight simulator to the IMU computer. The IMU computer is adapted for receiving flight state data and calculating IMU simulation data and outputting the IMU simulation data to an IMU signal generation board. The IMU signal generation board is adapted for receiving the IMU simulation data and generating IMU signals and injecting the IMU signals to the installed avionics system.
Abstract:
A positioning and ground proximity warning method for vehicle includes the steps of outputting global positioning system signals to an integrated positioning/ground proximity warning system processor; outputting an inertial navigation solution to an integrated positioning/ground proximity warning processor; measuring air pressure, and computing barometric measurements which is output to the integrated positioning/ground proximity warning processor; measuring time delay between transmission and reception a radio signal from a terrain surface, and computing radio altitude measurement which is output to the integrated positioning/ground proximity warning processor; accessing a terrain database for obtaining current vehicle position and surrounding terrain height data which is output to the integrated positioning/ground proximity warning processor; and receiving the position, velocity and time information or said pseudorange and delta range measurements of said global positioning system, the inertial navigation solution, the radio altitude measurement, the radio altitude measurement, and the current vehicle position and surrounding terrain height data, and computing optimal positioning solution data and optimal ground proximity warning solution data.