Name: 2 Layer FR4 PCB for GPS Module
Brand: PCB Printed Circuit Board and PCBA manufacturing
Rating: 5 (1 reviews)

2 Layer FR4 PCB for GPS Module

Product Model: 2-Layer GPS Module PCB

Base Material: FR4

PCB Layers: 2 Layers

Solder Mask Color: Green / White

Copper Thickness: 1oz

Finished Thickness: 1.0mm

Surface Treatment: Immersion Gold

Min. Trace / Space: 4mil / 4mil

Application: GPS Module PCB

Description
Data Sheet

1. Definition of 20‑Channel GPS Module

The channel parameter of a GPS module indicates the maximum quantity of satellites that the receiver can track and communicate with simultaneously. A 20‑channel GPS module is capable of locking and processing signals from up to 20 satellites at the same time.

Basic 2D positioning requires signals from at least 3 satellites, but the corresponding data is unstable and low in accuracy. Only by receiving signals from more than three satellites can the module output effective and reliable positioning information. Higher synchronous satellite coverage brings faster positioning response, higher precision and stronger environmental adaptability. In conventional urban surface scenarios, a GPS module can normally maintain stable connection with 4 to 11 satellites.

2. Reason for Delayed Positioning After GPS Module Startup

Prolonged positioning waiting usually occurs at the first power‑on or after long‑term shutdown.

Modules such as S‑87 are equipped with a built‑in backup button battery to sustain RTC operation and store satellite ephemeris data. When restarted, the module completes fast hot start positioning within 1~3 seconds.

If the module is powered off for more than 4 hours, the internal RTC loses continuous power supply. The next startup will switch to cold start mode, which needs to reload ephemeris and search for satellites from scratch, resulting in obviously longer positioning time.

3. Troubleshooting for Long-Time Cold Start Failure

When cold start cannot complete positioning normally, troubleshoot from the following dimensions:

Confirm the GPS antenna is placed in an open and unobstructed installation environment;
Check whether the module outputs standard GPS data normally;
Analyze satellite signal reception by reading GSV statements in GPS data.

Industrial-grade GPS modules output NMEA standard sentences such as $GPGGA, $GPGSA, $GPGSV and $GPRMC at a 1Hz refresh rate. The $GPRMC statement integrates core key data including longitude, latitude, navigation speed, moving direction, full time and date, and positioning validity judgment.

At present, mainstream GPS chips are dominated by the SiRF III series, featuring 20‑channel design and powerful real‑time computing performance, which occupies a leading market share. Common mainstream module brands cover Huantian, Dagama, U-blox and other suppliers.

4. Antenna Status Monitoring and Short-Circuit Protection

Antenna open circuit and short circuit are common faults in GPS application. High-quality GPS modules can actively output dedicated alarm statements to feed back antenna abnormal status, helping engineers quickly locate faults and avoid module burnout caused by abnormal overcurrent.

Mainstream models including S‑87, S‑90, S‑93 and U-blox are equipped with antenna monitoring functions, with obvious technical differences:

U-blox needs to be matched with peripheral auxiliary circuits to enable antenna detection;
Dagama realizes antenna open/short circuit monitoring without any peripheral devices.

In terms of firmware adaptation, this monitoring function is available for flash-version firmware with configurable IO resources; while ROM-version firmware has fixed IO definitions and cannot support secondary configuration, so it cannot enable antenna status detection.

Model : 2layers GPS Module

Material : FR4

Layer : 2L

Color : Green/White

Copper Thickness : 1OZ

Finished Thickness : 1.0mm

Surface Treatment : Immersion Gold

Trace/Space : 4mil/4mil

Application : GPS Module PCB

2 Layer FR4 PCB for GPS Module

Description

Data Sheet

1. Definition of 20‑Channel GPS Module

2. Reason for Delayed Positioning After GPS Module Startup

3. Troubleshooting for Long-Time Cold Start Failure

4. Antenna Status Monitoring and Short-Circuit Protection