Development of INS-Aided GPS Tracking Loop and Flight Test Evaluation

Toshiaki TSUJII, Takeshi FUJIWARA, Yoshimitsu SUGANUMA, Hiroshi TOMITA, Ivan PETROVSKI
2011 SICE Journal of Control Measurement and System Integration  
Robust tracking of a GNSS signal in a harsh environment such as a severe ionospheric scintillation is a challenge for the civil aviation. The use of an inertial sensor would improve the tracking performance since the Doppler frequency caused by aircraft dynamics could be compensated by the inertial measurements. In order to evaluate such an aiding, an INS aided GPS tracking loop is developed by using a software receiver, and a preliminary flight test is conducted. A navigation grade INS
more » ... coupled with GPS as well as a low-cost MEMS INS loosely-coupled with GPS are installed to provide aiding information. In addition, two GPS front end units with different clock (TCXO and OCXO) are installed to collect digitized IF data. Off-line analyses during aircraft take-off show that the noise band width in tracking loop can be reduced to three hertz by the aiding. Also, the Doppler aiding by a low-cost MEMS INS shows a similar performance with the aiding by a navigation grade INS.
doi:10.9746/jcmsi.4.15 fatcat:fs72mbniuvcjlnltnqwg576j7m