GPS World, March 2011

Road TRANSPORTATION Using this approach it is possible to assess whether improvements in the terms of matching the vehicle location correctly to more road segments and comparisons between OBU positions and a high accuracy reference solution alone it is not possible to determine observe a relationship between location error from OBUs and performance at road segment level map matching as map matching can compensate for observed between data availability and important to consider how successfully vehicle position can be related to charging objects be they road seg to Demonstrate that all elements of the Investigate alternative positioning algorithms to optimize availability Demonstrate the feasibility of broad Results Torino tested all elements of the solu ful generation transmission and use mined onboard were transferred back to the service centre and processed FIGURE 5 shows an city center correctly identifying all the Assess Impact of Assistance on TTFF To series of trials were conducted to com receiver typically used in road applications against the performance of the modes almanac and ephemeris information so only needs to obtain timing ranging information from each satellite manac information stored in its memory but it does not have any tion to search for satellites but will then need to demodulate the ephem TABLE 1 shows the results from testing the receivers in open sky and ur ephemeris is available on a receiver at start up it takes an average of 28 sec to an average of more than 2 minutes in the worst case urban environment as the receiver struggles to decode the navigation message on weak noisy dard procedure which is based on a decoding navigation subframes to de can take up to 6 seconds depending on the point in the transmission cycle that Tests have also been carried out us Th anks to Septentrio GPS technology we can run 24 7 operation with 0 misplaced containers Stephan Gosiau Technical Director PSA HNN A giant container terminal in the port of Antwerp Its hard to imagine a more complex day to day reality than that Around the clock massive freights are shipped unshipped and moved around the terminal What could well be a logistical nightmare now runs smoothly with the aid of Septentrios ultra precise positioning techniques Why Because we are reliable experts Because we are ahead www gpsworld com March 2011 GPS World 33