User's Manual
Table Of Contents
- About the Document
- Contents
- Table Index
- Figure Index
- 1 Introduction
- 2 Product Concept
- 3 Application Interface
- 3.1. General Description
- 3.2. Pin Assignment
- 3.3. Pin Description
- 3.4. Operating Modes
- 3.5. Power Saving
- 3.6. Power Supply
- 3.7. Turn on and off Scenarios
- 3.8. Reset the Module
- 3.9. RTC Backup
- 3.10. UART Interface
- 3.11. USIM Card Interface
- 3.12. USB Interface
- 3.13. PCM and I2C Interface
- 3.14. ADC Function
- 3.15. Network Status Indication
- 3.16. Operating Status Indication
- 3.17. Behavior of the RI
- 4 GNSS Receiver
- 5 Antenna Interface
- 6 Electrical, Reliability and Radio Characteristics
- 7 Mechanical Dimensions
- 8 Storage and Manufacturing
- 9 Appendix A Reference

UMTS/HSPA Module Series
UC20 Hardware Design
UC20_Hardware_Design Confidential / Released 56 / 84
4.2. GNSS Performance
The following table shows UC20 GNSS performance.
Table 24: GNSS Performance
Parameter
Description
Conditions
Typ.
Unit
Sensitivity
(GNSS)
Cold start
Autonomous
-144
dBm
With LNA
-147
dBm
Reacquisition
Autonomous
-154
dBm
With LNA
-159
dBm
Tracking
Autonomous
-155
dBm
With LNA
-160
dBm
TTFF
(GNSS)
Cold start
@open sky
Autonomous
32
s
XTRA enabled
22
s
Warm start
@open sky
Autonomous
29
s
XTRA enabled
3
s
Hot start
@open sky
Autonomous
2.5
s
XTRA enabled
2
s
Accuracy
(GNSS)
CEP-50
Autonomous
@open sky
<1.5
m
1. Tracking sensitivity: The lowest GPS signal level at the antenna port which the module does not fail
to fix within 5 minutes by reducing signal intensity.
2. Reacquisition sensitivity: The lowest GPS signal level at the antenna port which the module fixes
within 3 minutes by increasing signal intensity.
3. Cold start sensitivity: The lowest GPS signal level at the antenna port which the module fixes within 3
minutes by executing cold start command.
NOTES