© Quectel Wireless Solutions Co., Ltd. All rights reserved
November, 2019
Quectel LC79D GNSS ModuleProduct Overview
@ Quectel Wireless Solutions | November, 2019 | Page 2Rev.: V1.0 | Status: Released
Product Overview
Specifications
Development Timeline
Highlights and Advantages
Support Package
@ Quectel Wireless Solutions | November, 2019 | Page 3Rev.: V1.0 | Status: Released
Length: 10.1mm (± 0.15mm)
Width: 9.7mm (± 0.15mm)
Height: 2.4mm (± 0.2mm)
Weight: Approx. 0.42g
LC79D Mechanical Dimensions Dual-Band Multi-Constellation GNSS Module
9.7mm
10
.1m
m
2.4mm
@ Quectel Wireless Solutions | November, 2019 | Page 4Rev.: V1.0 | Status: Released
LC79D is a dual-band, multi-constellation GNSS module with ultra-compact footprint size and ultra-low power
consumption. It supports searching and tracking GPS L1 C/A, GPS L5, GlONASS L1, BeiDou B1, Galileo E1,
Galileo E5a, IRNSS L5, QZSS L1 and QZSS L5 satellites simultaneously. The module provides unprecedented
accuracy better than 1.2m.
LC79D supports two working modes with different ordering codes:
Product Overview
For standard applications where the module
will send PVT results.
Module OC: LC79DAMD
EVK OC: LC79DAEK
Standalone Mode
Host Mode
Need to run the PVT algorithm on host side to
get better performance with UDR feature.
Module OC: LC79DBMD
EVK OC: LC79DBEK
PVT: Position-Velocity-Time
UDR: Untethered Dead Reckoning
@ Quectel Wireless Solutions | November, 2019 | Page 5Rev.: V1.0 | Status: Released
Product Overview
Specifications
Development Timeline
Highlights and Advantages
Support Package
@ Quectel Wireless Solutions | November, 2019 | Page 6Rev.: V1.0 | Status: Released
Multi-constellation GNSS
• GPS L1 C/A
• GLONASS L1
• BeiDou (BDS) B1
• QZSS L1
• Galileo (GAL) E1
• GPS L5, Galileo E5a, IRNSS L5 and
QZSS L5
Channels 32 Channels
Horizontal Position Accuracy Autonomous 1.2m CEP
Velocity Accuracy Without Aid <0.1m/s
Acceleration Accuracy Without Aid 0.1m/s²
TTFF @-130dBm
with AGNSSCold Start <5s
TTFF @-130dBm
without AGNSS
Cold Start <34s
Warm Start <30s
Hot Start <2s
Sensitivity
Acquisition -147dBm
Tracking -163dBm
Re-acquisition -158dBm
Supply Voltage Range 1.7V~1.9V, typical 1.8V
Operation Temperature -40°C ~ +85°C
Dimensions 10.1mm × 9.7mm × 2.4mm
Weight Approx. 0.42g
Low Power Consumption
Acquisition:
47mA @1.8V (GPS/GLONASS/BeiDou/Galileo/IRNSS)
Tracking
43mA @1.8V (GPS/GLONASS/BeiDou/Galileo/IRNSS)
Power Saving Modes200μA @sleep mode
17μA @standby mode
SPI*
• Run at up to 50MHz
• Operate as a slave
• Support NMEA message output
• Multiplexed with UART
UART
• UART port: TXD and RXD
• 115200~921600bps baud rate,
115200bps by default)
• Used for NMEA output and firmware upgrade
I2C*
• Master mode
• 100 kbps/ 400 kbps/ 1 Mbps/ 3.4 Mbps
• Support both 7-bit and 10-bit addressing
LC79D Specifications
* means under development
@ Quectel Wireless Solutions | November, 2019 | Page 7Rev.: V1.0 | Status: Released
LC79D Supported Frequencies
LC79D
GPS L5
Galileo E5a
IRNSS L5
1176.45+/-10.23MHZ
1207.14+/-10.23MHZ
1207.14+/-
2.046MHZ
Galileo E5b
BDS B2 GPS L2C
1227.6+/-1.023
MHZ
1561.098+/-2.046MHZ1575.42+/-
1.023 MHZ
1575.42+/-2.046MHZ
1601.71875+/-3.91175MHZ
GPS L1
Galileo E1BDS B1I GLONASS L1
@ Quectel Wireless Solutions | November, 2019 | Page 8Rev.: V1.0 | Status: Released
Product Overview
Specifications
Development Timeline
Highlights and Advantages
Support Package
@ Quectel Wireless Solutions | November, 2019 | Page 9Rev.: V1.0 | Status: Released
2019
Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec.
CE
LC79D Timeline
Project Schedule
Regulatory Certification
ES CS MP
ES: Engineering samples ready. Basic functions are available for customers’ simple demo purpose.
CS: Commercial samples ready. Stable hardware design and quite stable software design. New software features can be added upon request.
MP: Hardware and software ready for mass production. For certification status, please refer to the “certification schedule”.
LTO
Low power mode UDR validation
@ Quectel Wireless Solutions | November, 2019 | Page 10Rev.: V1.0 | Status: Released
Product Overview
Specifications
Development Timeline
Highlights and Advantages
Support Package
@ Quectel Wireless Solutions | November, 2019 | Page 11Rev.: V1.0 | Status: Released
L5/ E5 Benefits (1)
Signal Attribute L1 L5 E5 Benefits
10x higher chipping rate □ ■ ■ Multipath rejection
Up to 3db increased signal power □ ■ ■ Better weak-signal tracking
Pilot signal □ ■ ■ 6db better weak-signal tracking
Ionospheric estimation using
dual-frequency□ ■ ■ Sub-meter accuracy in open sky
Error correction code on
navigation messages □ ■ ■ More reliable autonomous cold start
More frequent navigation messages □ □ ■ Faster autonomous cold start
50MHz signal bandwidth using E5b □ □ ■ Further improvement in multipath rejection
Secondary codes □ ■ ■ Reduced signal cross correlation
@ Quectel Wireless Solutions | November, 2019 | Page 12Rev.: V1.0 | Status: Released
Dual-Band Benefits (2)
In urban areas, the dual-band
module provides higher positioning
accuracy.
Single-Band Module - M2
Single-Band Module - U
Dual-Band Module - LC79D
Single-Band Module - M1
@ Quectel Wireless Solutions | November, 2019 | Page 13Rev.: V1.0 | Status: Released
Static Scenario - Open Sky
LC79D provides better
performance than single-band
modules.
Dual-Band Benefits (3)
@ Quectel Wireless Solutions | November, 2019 | Page 14Rev.: V1.0 | Status: Released
Static Scenario - Half Open Sky
LC79D-2# LC79D-1# U-xxx
LC79D provides better
performance than single-
band modules.
Dual-Band Benefits (4)
@ Quectel Wireless Solutions | November, 2019 | Page 15Rev.: V1.0 | Status: Released
Static Scenario - Multipath Area
Dual-Band Benefits (5)
LC79D provides better
performance than single-band modules.
@ Quectel Wireless Solutions | November, 2019 | Page 16Rev.: V1.0 | Status: Released
Dual-Band Benefits (6)
LC79D provides higher
positioning accuracy in
urban areas.
A: Dual-Band Module (LC79D)
B: Single-Band Module
@ Quectel Wireless Solutions | November, 2019 | Page 17Rev.: V1.0 | Status: Released
In a short tunnel, LC79D
keeps continuous tracking,
while the single-band
module loses its position.
Dual-Band Benefits (7)
Exit of the tunnelExit of the tunnel
Exit of the tunnelEntry of the tunnel
A: LC79D – 1#
B: LC79D – 2#
C: U-XXX
@ Quectel Wireless Solutions | November, 2019 | Page 18Rev.: V1.0 | Status: Released
Under an elevated
highway, LC79D provides
better positioning
performance.
Dual-Band Benefits (8)
A: LC79D – 1#
B: LC79D – 2#
C: U-XXX
@ Quectel Wireless Solutions | November, 2019 | Page 19Rev.: V1.0 | Status: Released
UDR Feature in Host Mode (1)
In Android and Linux systems, LC79D works as a receiver only, and runs PVT algorithm on the
host. The benefit of this mode is that if the system is strong enough, then an external 6-axis
sensor can be designed to enable Untethered dead reckoning feature, thus providing further
improved performance.
Urban Areas
@ Quectel Wireless Solutions | November, 2019 | Page 20Rev.: V1.0 | Status: Released
UDR Feature in Host Mode (2)
Under Elevated Highway
@ Quectel Wireless Solutions | November, 2019 | Page 21Rev.: V1.0 | Status: Released
UDR Feature in Host Mode (3)
Underground Parking Garage
@ Quectel Wireless Solutions | November, 2019 | Page 22Rev.: V1.0 | Status: Released
Regulatory (Indian government)
Better multipath performance in India/Asia
• More visible satellites in urban canyon
• Higher elevation satellites
Jamming benefits (if L1 is jammed)
• Can demonstrate at Proof of Concept stage
• L1 goes down, L5 stays strong
Complementary to BeiDou and QZSS regional systems
IRNSS Key Benefits
@ Quectel Wireless Solutions | November, 2019 | Page 23Rev.: V1.0 | Status: Released
AGNSS Features
Ephemeris (or Extended Ephemeris: Long Term Orbits, LTO)
• Ephemeris in assist data enables GNSS fixes without direct view of SVs.
• Decoding ephemeris from SVs requires direct view and takes 30s, ephemeris in assist data saves this time.
• If time is not present, the receiver must decode
TOW (transmits each 6s for each SV) and
Week number (transmits each 30s, from at least one SV)
Reference Time (2-3s Accuracy)
• With reference time, receivers can compute SV positions from ephemeris
• With reference time, there is no need to decode week number - only TOW decoding is needed
Reference Location (Different Uncertainties)
• Enable SV visibility calculation (≤ 1400km reference location uncertainty)
• Resolve PRN uncertainty (≤ 150km reference location uncertainty)
• Enable estimate of received frequency from each SV (≤ 50km reference location uncertainty)
• Enable estimate of search window around frequency from each SV (≤ 50km reference location uncertainty)
@ Quectel Wireless Solutions | November, 2019 | Page 24Rev.: V1.0 | Status: Released
Product Overview
Specifications
Development Timeline
Highlights and Advantages
Support Package
@ Quectel Wireless Solutions | November, 2019 | Page 25Rev.: V1.0 | Status: Released
Support Package (1)
Evaluation Kit
Interfaces
• Serial port
• Antenna interface
• Micro-USB interface
Accessories
• Micro-USB cable
• Antenna
@ Quectel Wireless Solutions | November, 2019 | Page 26Rev.: V1.0 | Status: Released
Documents
• Hardware Design
• Reference Design
• Protocol Specification
• EVB User Guide
• Footprint & Parts in PADS
• 3D Dimensions
Support Package (2)
PC Tools
• QGNSS
• GNSSFlashTool
© Quectel Wireless Solutions Co., Ltd. All rights reserved
www.quectel.com
Building 5, Shanghai Business Park Phase III (Area B), No.1016
Tianlin Road, Minhang District, Shanghai 200233, China
Tel: +86-21-5108 6236 Email: [email protected]
Website: www.quectel.com
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