Quectel LC79D GNSS Module - AURORA EVERNET

© 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


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


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


Product Overview

Specifications



Support Package


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


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


Product Overview

Specifications



Support Package


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


Product Overview

Specifications



Support Package


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


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


Static Scenario - Open Sky

LC79D provides better

performance than single-band

modules.



Static Scenario - Half Open Sky

LC79D-2# LC79D-1# U-xxx


performance than single-

band modules.



Static Scenario - Multipath Area



performance than single-band modules.



LC79D provides higher

positioning accuracy in

urban areas.

A: Dual-Band Module (LC79D)

B: Single-Band Module


In a short tunnel, LC79D

keeps continuous tracking,

while the single-band

module loses its position.


Exit of the tunnelExit of the tunnel

Exit of the tunnelEntry of the tunnel

A: LC79D – 1#

B: LC79D – 2#

C: U-XXX


Under an elevated

highway, LC79D provides

better positioning

performance.


A: LC79D – 1#

B: LC79D – 2#

C: U-XXX


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



Under Elevated Highway



Underground Parking Garage


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


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)


Product Overview

Specifications



Support Package


Support Package (1)

Evaluation Kit

Interfaces

• Serial port

• Antenna interface

• Micro-USB interface

Accessories

• Micro-USB cable

• Antenna


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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