GPS World, November 2018

GPS INS SIMULATION to verify the performance of the above proposed ultra tight GPS INS integration system architecture For the GPS data a satellite navigation simulation signal generator was used to build and generate the desired trajectory The selected model has the ability to provide dynamic capacity in Doppler and signal power levels as well as adequate channels to simulate line of sight and multipath satellite signals The unit is driven by a software package that comes in different versions the most powerful version is used in this research to drive the simulation hardware system to generate the output radio frequency RF signal A receiver front end then generates the discretized data stream in the form of in phase I and quadraturephase Q signals The unit is a rugged dual frequency L1 L2 front end intended mainly for software receiver and interference detection systems The unit is capable of logging L1 L2 data at bandwidths of 25 MHz 50 MHz 10 MHz and 20 MHz with data quantization varying from 1 bit to 8 bits For the INS data sets the INS simulator developed by the Mobile Multi sensor Group at the University of Calgary is used for simulating inertial measurement unit IMU raw data The INS simulator can virtually generate the raw data measurements of any grade of IMUs such as navigation tactical and consumer grade systems A wide number of sensor errors can be simulated using this software such as bias instability random walk scale factor errors due to thermal drift and g sensitivity and so on While the simulator can generate raw IMU measurements using user defined vehicle motion and dynamics such as static scenarios straight line constant velocities accelerations turns and bumpy roads and it FIGURE 4 Data simulation tool flow diagram Bring satellites into your lab The new R S SMW200A GNSS simulator The SMW200A is the new tool of choice when it comes to advanced complex and demanding GNSS testing It can be operated as a pure GNSS constellation simulator or even used for realistic coexistence testing by generating GNSS noise and interference signals at the same time With its hardware extension options and its powerful capabilities to simulate multiconstellation multifrequency multiantenna and multivehicle scenarios the SMW200A covers a wide variety of high end GNSS applications Find out more www rohde schwarz com ad GNSS solutions NOVEMBER 2018 WWW GPSWORLD COM GPS WORLD 29