Table of Contents
Advertisement
Chapter 1
Additional features for the receiver card include:
•
GEO signal processing
•
GPS signal processing
•
Galileo signal processing
•
Digital pulse blanking for the GPS L1 signal
•
Digital pulse blanking for the GPS L5 signal
•
Digital pulse blanking for the Galileo L1 signal
•
Digital pulse blanking for the Galileo E5a signal
•
Digital pulse blanking for the Galileo E5b signal
Galileo signal processing will only be available on activated models.
Some of these features are discussed further in the following sections.
1.5.1
GEO Signal Processing
Specific channels have the capability to receive and process the SBAS signal provided by GEOs. These signals
are in-band at L1 and L5. They are identified through the use of SBAS-specific PRN numbers. The SBAS
message is decoded and separated into its various components. The SBAS message and associated pseudorange
are provided as an output.
1.5.2
Digital Pulse Blanking
Digital pulse blanking involves removing or attenuating pulses in the RF signal that exceed a specified level.
The EuroPak-15ab provides digital pulse blanking for the GPS L1, GPS L5, Galileo L1, Galileo E5a and
Galileo E5b signal paths. Digital pulse blanking reduces the negative effects of pulsed interference.
Use the PULSEBLANKING command to enable/disable pulse blanking or control its sensitivity, see Page 65.
1.6
Functional Overview
In addition to the EuroPak-15ab, an GNSS receiver system typically contains three other major components:
•
An antenna (and optional LNA power supply) or signal generator
•
A power supply
•
Data communications equipment
1.7
Internal Euro-L1E5a and E5a/E5b Cards
The internal Euro-L1E5a card consists of a radio frequency and a digital electronics section. The EuroL1E5a
card communicates with the E5A/E5B card over the receiver backplane using USB.
1.7.1
Radio Frequency Section
The receiver obtains a filtered and amplified L1, L5, E5a or E5b signal from the antenna or signal generator via
the coaxial cable. The RF section performs the translation from the incoming RF signal to an IF signal usable
by the digital section. It also supplies power to the active antenna's LNA through the coaxial cable while
maintaining isolation between the DC and RF paths. The RF section can reject a high level of potential
interference (for example, MSAT, Inmarsat, cellular phone, and TV sub-harmonic signals).
24
EuroPak-15ab Receiver User Manual Rev 1
Introduction
Advertisement
Table of Contents
