JAVAD GNSS TRE-3 Successfully Tracks First Live TMBOC Signal

The newly launched BeiDou Phase 3 satellites have several new signals. One is extremely similar to the future GPS L1C signal with time-division BOC(1,1) and BOC(6,1) signals. Such a type of modulation is called time-multiplexed binary offset carrier (TMBOC). (Read more about TMBOC in the June 2011 Innovation article “MBOC Signal Options: Performance of Multiplexed Binary Offset Carrier Modulations for Modernized GNSS Systems.”)

To track the new signals, JAVAD GNSS used the same decoding approach described in the February 2013 GPS World article, “Signal Decoding with Conventional Receiver and Antenna: A Case History Using the New Galileo E6-B/C Signal” by Sergei Yudanov, JAVAD GNSS. As a result, the signal’s structure was decoded and L1C TMBOC tracking has been successfully tested on the JAVAD GNSS TRE-3 receiver.

In addition, new signals on 1575.42+1.023*14 MHz (B1-2), 1176.45 MHz (E5A) and 1207.14 (E5B) frequencies for three satellites (PRN 32, 33, 34) also have been decoded and tested.

Here are graphs illustrating the experiment:

I of BOC(1,1) (red), BOC(6,1) (green) and their sum (blue) vs code shift.

dI of BOC(1,1) (red), BOC(6,1) (green) and their sum (blue) vs code shift.

Horizontal axis: 0 – minus one chip shift; 327 – zero shift; 655 – plus one chip shift

C/N_O and iono-free “range minus phase”.

Slot – Beidou signal
C/A – B1
P1 – B1-2
P2 – E5B
L2C – B3
L5 – E5A
L1C – L1C