FAQ
Frequently Asked Questions
To search the Frequently Asked Questions (FAQs) on this topic, enter your search terms. If you can't find the answer you're looking for contact our technical support at [email protected]
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General GNSS
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- 1. GPS Principle
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- 1.1. How many GPS satellites are in orbits around Earth?
- 1.2. How is GPS used?
- 1.3. Will GPS receivers work anywhere on Earth?
- 1.4. What is NMEA 0183?
- 1.5. What is "Acquisition Time" ?
- 1.6. How much time is required to receive all data in the GPS navigation message?
- 1.7. What are some of the ways of increasing GPS position accuracy?
- 1.8. What is DGPS?
- 1.9. What is WAAS?
- 1.10. What is EGNOS
- 1.11. What is AGPS?
- 1.12. Is map included in GlobalTop GPS module?
- 2. GPS Module Hardware (Engine Board)
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- 2.1. What are the differences between GPS module and GPS antenna module?
- 2.2. What are the differences between each model of GPS modules?
- 2.3. Does GlobalTop GPS module comes with evaluation board or test kit?
- 2.4. Is it possible to connect USB port or RS232 port to GlobalTop evaluation kit?
- 2.5. How to test for TTFF (Time to First Fix)?
- 2.6. How to test for reception sensitivity?
- 2.7. What is the difference between UART and USB ports on GlobalTop modules?
- 2.8. What are the altitude, velocity and acceleration rating for GlobalTop GPS modules?
- 2.9. What is the difference between GPS standalone module and GPS antenna module? Which is better?
- 3. GPS Module Software
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- 3.1. What software tools are available for download?
- 3.2. What is PMTK protocol? Where do I obtain such documentation?
- 3.3. How do I set GPS module update rate above 1Hz
- 3.4. What kind of operating systems are supported by GlobalTop?
- 3.5. Why can't Mini GPS Tool write my setting to flash memory and set it as default?
- 3.6. What is the purpose of having flash memory to GPS modules if I cannot save settings?
- 3.7. Why can't I change the data baud-rate on GPS module interface?
- 3.8. How do I pause module data output?
- 3.9. What software customization services does GlobalTop provide?
- 3.10. Why are there two different USB drivers?
- 3.11. What is a GPS drift? How does GlobalTop solve this problem?
- 3.12. Can the GPS module retain the last known position after GPS satellite fix is lost?
- 3.13. How do I check the firmware version for my GPS module?
- 3.14. Firmware cannot be flashed successfully using GlobalTop GPS tool, what's wrong?
- 3.15. What version of RTCM is supported by GlobalTop GPS module? Does it support RTK?
- 3.16. Why does the GPS module cease to function when it reaches 1000 knots or 60,000 ft?
- 3.17. Why can't I set 10Hz update rate and SBAS support at the same time?
- 3.18. Can I enable 10Hz update and Magnetic Variation at the same time?
- 3.19. How do I change baud-rate of my GPS module?
- 3.20. Does GlobalTop GPS module support altitude hold or position hold mode?
- 3.21. Is the NMEA sentence output for u5 series different from the rest of GlobalTop GPS modules? How so?
- 4. GPS Module Design
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- 4.1. Is there a design guide available?
- 4.2. Why does it take so long for my GPS module to obtain position fix?
- 4.3. Help! Why is the GPS reception sensitivity so low on my design?
- 4.4. Help! Why won't my module turn on?
- 4.5. What is the purpose of having damping resistors placed near UART terminals?
- 4.6. What is the purpose of having VBackup (or backup power) connected?
- 4.7. Does GlobalTop GPS module provides sub-meter accuracy GPS? How do I increase the accuracy?
- 4.8. For the integrated USB I/O port, which operating system is supported by GlobalTop?
- 4.9. What differentiate between Cold Start, Warm Start and Hot Start?
- 4.10. Is it possible to put the GPS module to sleep via software command?
- 4.11. Help! My GPS module died after powering on and off, what can I do?
- 4.12. What is the high and low voltage level for the GPIO ports (3D-Fix, 1PPS) in MT3329 GPS modules?
- 4.13. Why does the GPS module take so long to fix inside building? I thought it has -165dBm sensitivity?
- 4.14. I see that some model of GPS module has a SPI port, can I use this to receive NMEA?
- 5. External Antenna
Contact Us
GlobalTop Technology Inc.
No. 16, Nan-Ke 9th Road, Science-Based Industrial Park, Tainan 741, Taiwan
TEL: +886-6-5051268
FAX: +886-6-5053381
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