Error test conditions simulation Sample Clauses

Error test conditions simulation. Simulation technology allows simulate signal induced error conditions that may occur in real situations and also absolutely unrealistic situation. Based on the simulated signal with defined error conditions GNSS devices and applications are tested to verify their response. For example this scenario verifies that navigation device in the vehicle which does not receive any GNSS signal already using only data from sensors in the vehicle. 5.2.8.3.1 Multipath signal reception Multipath is the effect of influencing the accuracy of positioning using GNSS. It is a fact that the satellite signal is reflected from buildings or other obstacles, including land and water. Reflections coming into the receiver traveled a greater distance from the satellite for a longer time. This influence pseudo range determination and thus the exact position. The problem of multipath signal reception occurs mainly in the so-called urban canyons. Illustration can be seen in Figure 13. D4.1 Draft KPIs, test specification and methodology The receiver has no way to distinguish incoming signals and, therefore, considers all the resulting signals together. To reduce the inaccuracies is the better design of the antenna. Some advanced receivers solve multipath by making use of only the first detected signal (which is considered to be one that spreads directly from satellite), then any delayed signals involved. Using simulation tools to model for any multipath signals independently of their distribution (i.e. separately). There can be set the signal spread in the direct line of sight, or without. For each such signal there can be determined the level of the reflected signal, and possibly influence the signal on a sufficient channel. The reflections can also set the parameters for the Doppler signal shift, the phase signal shift, the signal points of the receiver antenna, and more detailed parameters. D4.1 Draft KPIs, test specification and methodology