General GPS Technology Blog — General

Why can RTK GNSS achieve so much better accuracy than standalone GNSS receivers?

Posted by jack wu on

GNSS receivers measure how long it takes for a signal to travel from a satellite to the receiver. Transmitted signals travel through the ionosphere and atmosphere and are slowed down and perturbed on the way. For example, travel time on a cloudy day and in clear sky conditions would be different. That is why it is difficult for a standalone receiver to precisely determine its position.  RTK(Real Time Kinematic) technology solves this issue by using correction services. In the RTK method, a user receiver gets correction data from a single base station or from a correction service from Internet. It...

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What is main difference between a RTK GNSS receiver and a traditional GNSS receiver?

Posted by jack wu on

The main difference is RTK GNSS takes in the correction stream, but traditional GNSS doesn't. RTK is short for real time kinematics. A GNSS receiver capable of RTK takes in the normal signals from the Global Navigation Satellite Systems along with a correction stream to achieve 1cm positional accuracy. GNSS includes satellites from GPS (USA), GLONASS (Russia), Beidou (China), and Galileo (Europe). On top of these signals an RTK receiver takes in an RTCM correction stream and then calculates your location with 1cm accuracy in real time.   RTK is a technique used to improve the accuracy of a GNSS receiver....

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Tools for convert your NMEA file to GPX file

Posted by shaojie wu on

GPSBabel -This utility can transfer your NMEA file to GPX file or other formats. It has Windows, Mac & Linux versions. Please go to http://www.gpsbabel.org for free download.

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Why sometimes GPS loggers / GPS receivers have less battery run time?

Posted by jack wu on

Why sometimes GPS loggers / GPS receivers have less battery run time?

GPS has longer battery runtime under optimum environment. For those non optimum environments, (For example. when keep trying a position fix, seeking Bluetooth Connection, or under an unstable environment – bad weather, forest, buildings.) GPS would need more calculation and power consumption. So that battery runtime is less than the one in optimum condition.

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If your GPS Receiver / Logger getting the position fix not as far as below, what you should do?

Posted by jack wu on

If your GPS Receiver / Logger getting the position fix not as far as below, what you should do?

I will suggest reset or cold restart the GPS, which will rest the GPS registers/cache. When the GPS start up again, the GPS will redo the calculation and update the registers/cache.

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