Students who have mastered the use of software GNSS receivers in the first year will move on to more advanced assignments. The content of the assignments will be gathered not only from the university faculty but also from GNSS-related companies and national research institutes, and will be challenging and rewarding. This does not mean that all of the tasks listed below will be implemented. We hope to start with those that are feasible and match the interests of the participants.
|1||Development of a receiver for ionospheric scintillation monitoring||Scintillation monitoring of the ionosphere has already been implemented around the world, but it has been pointed out that the corresponding receivers are very expensive for scientific use. Since it is easy to output observation data at 100 Hz or so on SDRs (software receivers), we will examine whether we can substitute the above receivers at low cost and in real time.|
|2||Analysis of the L1C/B signal broadcasted by QZS-1R||JAXA is testing new signals for QZS-1R and based on the IF data for SDR acquired there, we will implement signal acquisition and tracking of L1C/B signals to understand the performance.|
Possibility of signal tracking for CSK modulation
|For the first Quasi-Zenith Satellite, the L6 signal was BPSK modulation, not CSK modulation, so it was easy to observe the carrier phase and the observation data output by the commercial receiver had no issue. However, since the CSK modulation was used for Units 2-4, the observation data such as carrier phase could not be confirmed. Therefore, we will try to acquire the carrier phase observation data with the CSK modulated data.|
|4||Deep coupling of GNSS and IMU||Integration of GNSS with other sensors such as IMUs is widespread, but for the most part remains loose or tight coupling. By learning the signal tracking part of the software GNSS receiver, which is the subject of this assignment, coupling with IMUs and other sensors in this signal processing part is possible, and coupling at a deeper level can be tested.|
|5||Signal processing from LEO satellites (low earth orbit satellites)||The front ends we have prepared for this project cover a wide range of bandwidths, making it possible, for example, to develop signal processing according to the frequency bands of LEO satellites. In fact, positioning using LEO satellites has been reported in the United States and China, mostly using software receivers.|