Three loops — A method for tracking a new TWSTFT signal FBOC

In this paper, a new defined modem with Flexible Binary Offset Carrier (FBOC) signal has been developed by the Beijing Institute of Radio Metrology and Measurement (BIRMM), we demonstrate our work details on receiving the FBOC signal. We realize it based on the FPGA and DSP hardware platform. A structure of three loops to solve the tracking ambiguous problem is also demonstrated. To evaluate the performance of the tracking algorithm in our modem, a local 70MHz IF TWSTFT experiment was done, and the results show that the new signal and the tracking algorithm meets our expectations.