IMPROVEMENT OF EGNOS CORRECTION FOR EASTERN PART OF POLAND

摘要

Prepared tests detected unexpected modifications in SiSNet EGNOS message. That fact requires additional monitoring of EGNOS SiSNet message. The points' positions obtained from 'improved' EGNOS corrections should be compared with these obtained from the original EGNOS corrections received via SiSNet as well as via SiS. During the analyses, special attention should be paid to the EGNOS message and all of them should be done only for the proper message. Currently the implementation of 'improved' correction for the original EGNOS message is prepared. Base on the RTCADO-229D the computed values of ionospheric delay are converted to the EGNOS message format and inserted into the appropriate message type (number 18 and 26). In the near future the tests of the new - 'improved' EGNOS correction will be carried out. For the static test two receivers would work parallel in SRC building. They would be connected to a single antenna. Because of an unexpected modification in EGNOS SiSNet message the test will perform as two experiments: one receiver will work using SiS EGNOS correction and the second one using SiSNet 'improved' corrections. one receiver will work using SiSNet EGNOS corrections and the second one using SiSNet 'improved' corrections with additional continuous monitoring by SiS EGNOS message. The dynamic experiment is to show the usefulness of 'improved' EGNOS correction for navigation of a moving vehicle. We plan to use the Mobile GNSS Laboratory (MGL) - the Mercedes MB100D. The MGL will be equipped with the set of GNSS receivers: Two Septentrio PolaRX2 receivers (geodetic dual frequency GPS+EGNOS) - they will be connected to a single antenna. two Garmin GPS18 receivers (navigation single frequency GPS+EGNOS) -integrated receiver-antenna, or another Garmin navigation receivers (the Garmin representative in Poland is interested in renting us new receivers for tests); geodetic, dual frequency receiver: Trimble SPS850 or Trimble 5700, which will be used for reference positions computation. The location of the dynamic experiment will be selected very carefully because of the need of an open horizon near the route. It may be the an airport runway for example.