Novatel OEM719, Инструкция по установке и эксплуатации

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Chapter 1 Introduction
OEM7 Installation and Operation User Manual v4 20
Figure 1: OEM7 Receiver System
1.2.1 OEM7 Family Card
NovAtel’s OEM7 family cards consist of a Radio Frequency (RF) section and a digital section.
Radio Frequency (RF) Section
The receiver obtains GNSS signals from the antenna. The RF section down converts the incoming
RF signals to Intermediate Frequency (IF) signals which are processed by the digital section.
The RF section also supplies power to the active antenna Low Noise Amplifier (LNA) through the
coaxial cable. The RF section has been designed to reject common sources of interference.
Digital Section
The heart of the digital section is NovAtel’s MINOS7 ASIC (Application Specific Integrated Cir-
cuit). The digital section digitizes and processes the IF signals to obtain a GNSS solution (pos-
ition, velocity and time). It also processes the system I/O, shown in
Figure 1: OEM7 Receiver
System above.
1.2.2 Enclosure
An enclosure is necessary to protect the OEM7 receiver card from environmental extremes
(moisture, dust, etc.).
1.2.3 GNSS Antenna
The receiver can supply power for the antenna LNA. If the antenna is not compatible with the
OEM7 power supply (5 VDC), an external LNA supply may be required.
1.2.4 Power Supply
A power supply capable of delivering the minimum receiver operating voltage and power is
required. See
Power Supply Requirements for Receiver Cards on page 26 for details.