Chapter 1 CPT7 Overview
CPT7 and CPT7700 Installation and Operation User Manual v12
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State
Description
Yellow solid
No solution
Yellow slow blink
UAL Out of Bounds
State
Description
Off
INS inactive
Green solid
INS solution good
Green slow blink
INS alignment complete
Green fast blink
INS solution free
Green/Yellow alternating blink
INS high variance
Yellow slow blink
INS aligning/determining orientation
Red solid
Error
Table 5: INS LED
Refer to
Table 11: Inertial Solution Status
on page 83 for more information about the INS solution
states.
LED State
Description
Off
The CPT7 is connected to a computer as a mounted device
See
Access CPT7 Internal Memory with a Computer
Green solid
Internal logging stopped (memory available)
Green slow blink
Logging to internal memory (memory available)
Green/Yellow alternating blink
Logging to internal memory (low memory)
Yellow solid
Internal logging stopped (low memory)
Yellow fast blink
Memory is mounting or unmounting/busy
Red solid
Internal memory full or corrupt/bad
Refer to
Repair Errors on the CPT7 Internal Memory
Table 6: LOG (Onboard Storage) LED
1.3 Fundamentals of GNSS+INS
GNSS positioning observes range measurements from orbiting GNSS satellites. From these observations, the
receiver can compute position and velocity with high accuracy. NovAtel GNSS positioning systems are highly
accurate positioning tools. However, GNSS in general has some restrictions which limit its usefulness in some
situations. GNSS positioning requires line of sight view to at least four satellites simultaneously. If these
criteria are met, differential GNSS positioning can be accurate to within a few centimeters. If however, some or
