GPS World, November 2017

Simulation teSting nowadays are implemented as MEMS among others and of other common aiding sensors To obtain more accurate positioning for location based services and navigation GNSS chipset and receiver manufacturers as well as system integrators combine more and more GNSS navigation with such sensor fusion or signals of opportunity The optional SEP enables controlled and progressive testing of sensorfusion algorithms when used with NCS Control Center operating software This software supplies the SEP with an internally or externally generated center of gravity CoG trajectory for the device under test The various sensor models to be emulated by the SEP run within the Control Center software The device under test vehicle input trajectory at the CoG passes through the sensor model which in turn generates the appropriate sensor output by taking into account the corresponding error model for each sensor defined A From Syntony We have added the capability to emulate INS IMU data in addition to GNSS signals to our Constellator simulator to offer to the customers a complete testing platform Constellator can simulate up to six gyrometers and six accelerometers The attitude of each sensor is defined with respect to the vehicle axes Deterministic errors can be configured to simulate the axis misalignment and scale factors and biases can be defined in order to simulate realistic sensors Stochastic error models are also available such as random walk or Gauss Markov models for each sensor gyrometer or accelerometer to improve the sensor emulation fidelity Q Do you have detailed scenarios for jamming and spoofing in timing use of GNSS receivers that is involving time synchronization for telecommunications companies A From Skydel The simulated jammers signal specification must be very flexible in order to faithfully simulate real world jamming events For example the jammers spectral shape should be flexible enough to simulate a Blue Force electronic attack BFEA on a GNSS receiver Also the simulator should be able to simulate dynamic scenarios by varying the power of the jammers as a function of their trajectories and as a function of different antenna patterns Sometimes when testing receivers the simulated jammers should replicate pre recorded waveforms from real world The ability to play back the November 2017 www gpsworld com GPS World 37