Topcon Positioning Group has announced that its latest GNSS reference receiver has tracked a new signal from the GLONASS constellation.
The GLONASS-M satellite designated GLN 21(Fn 4) was launched on June 14 from Plesetsk, Russia, and became operational August 3.
A technical brief prepared by Topcon engineers Andrey Veitsel, Vladimir Beloglazov, and Alexey Lebedinsky describes the high-frequency L3 signal transmitted by the space vehicle, which includes two quadrature components: a BPSK(10)-modulate information (binary) component and a pilot signal, also BPSK(10)-modulated.
The modulating sequence of the information component is generated by a composition of the pseudorandom Kasami sequence, five-millisecond data code, and five-bit Barker code of symbol length one millisecond. The modulating sequence of the pilot component is generated by a mixture of the Kasami pseudorandom sequence and 10-symbol Newman-Hoffman code of symbol length one millisecond.
The satellite tracking was carried out in October of 2014 with a NET-G5 receiver employing an engineering version of firmware. Observation results were recorded in a standard log file. In addition, one-millisecond values of the components of the received signals were also recorded in log-files within the L3 bandwidth at rate of one kilohertz.
QZSS and satellite-based augmentation signals.