Abstract
Prior to the design and development phase of the European Galileo
programme, the European Space Agency (ESA) undertook several pre-development
projects to reduce the overall programme risk. Navigation signal
bandwidth was determined to he one key risk area. This paper describes
the development and use of a highly flexible signal validation facility
designed to generate and receive novel, band-limited GNSS signals.
The GNSS signal validation facility consists of a fully functioned
real-time GNSS constellation simulator and signal generator; a dedicated
receiver, a navigation processing unit and a performance analysis
software suite. The constellation simulator, receiver and navigation
processing unit are capable of operating in real-time with 12 satellites
in view and three frequencies per satellite. The GNSS signal validation
facility itself is extremely flexible to allow performance comparisons
of different satellite constellations, signal designs, code lengths,
data rates and frequencies. The GNSS signal validation facility has
been used in an extensive test campaign to evaluate the performance
of the novel band-limited GNSS signals under realistic user conditions
with a representative Galileo satellite constellation. A strong focus
of the signal validation test campaign was the performance of three-carrier
differential navigation algorithms. This paper briefly describes
the operation of the GNSS signal validation facility and provides
an overview of the main test campaign performanee results. This paper
contains the first published results from the GNSS signal validation
facility. A major result from the test campaign is that the novel
hand-limited CNSS signals provide robust and accurate positioning
capability with navigation data rates of up to 3000 s/s. The receiver
was shown to receive 24 MHz baud-limited signals with a loss of less
than 1 dB for a spreading code of 15.345 Mc/S and a sampling frequency
of 56 MHz
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