Conclusion; Receiver Overview - Javad Prego Operator's Manual

I N T R O D U C T I O N
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Principles of Operation

Conclusion

Receiver Overview

When power is turned on and the receiver self-test completes, the receiver's
40 channels initialize and begin tracking visible GPS and GLONASS
satellites. Each of the receiver's channels can be used to track C/A-L1, P-
L1, or P-L2 signals. The number of channels available allows the receiver to
track simultaneously all visible GPS and GLONASS satellites at any time
and location. The combination GPS and GLONASS (GPS+) antenna
receives the different signals for processing.
An external GPS+ antenna equipped with an optional low noise amplifier
(LNA) and the receiver's radio frequency (RF) device are connected with an
1-4 Prego Operator's Manual
• Availability – The availability of satellites affects the calculation of
valid positions. The more visible satellites available, the more valid
and accurate the position. Natural and man-made objects can block,
interrupt, and weaken signals, lowering the number of available
satellites.
• Integrity – Fault tolerance allows a position to have greater
integrity, increasing accuracy. Several factors combine to provide
fault tolerance, including:
–Receiver Autonomous Integrity Monitoring (RAIM) detects faulty
GPS and GLONASS satellites and removes them from the position
calculation.
–Wide Area Augmentation System (WASS) creates and transmits
DGPS correction messages.
–Five or more visible satellites for only GPS or only GLONASS;
six or more satellites for mixed scenarios.
–Current ephemerides and almanacs.
–Several algorithms to detect and correct faulty information.
You can use JNS GPS+ receivers to collect data from a network of
satellites and control stations to triangulate precise points anywhere on
Earth.
This overview simply outlines the basics of GPS and GLONASS
positioning. For more detailed information, visit the JNS website
(www.javad.com).
www.javad.com