The difference between single frequency GPS module and dual frequency GPS module
author: Ada Wu
2022-12-03
The difference between single frequency GPS module and dual frequency GPS module
The single frequency GPS module can only receive GPS L1 band satellite signals. As long as trackers GPS can receive the positioning signals of four satellites, it can perform positioning with an error of 5-10 meters. The GPS modules developed by SKYLAB all use MTK high-performance positioning chips, so they can accept more than 10 satellite positioning signals. So the positioning accuracy can reach 2.5-3 meters.
The GPS module in the gps car tracker device is equivalent to a satellite signal receiver. By continuously capturing and tracking satellite signals, according to the standard specifications of NMEA-0183 protocol, the GPS module transmits the received satellite information data to the gps tracker equipment through the UART serial port, and performs positioning calculation according to the data in a certain way to finally obtain the longitude and latitude, height, speed, time and other information required by the tachograph.
The dual frequency GPS module can simultaneously receive satellite signals in GPS L1 and GPS L5 frequency bands. By using the difference between dual frequency and ionospheric delay, the influence of ionospheric delay on electromagnetic wave signals can be eliminated. In addition, the dual frequency GPS module can speed up the ambiguity resolution of the whole cycle channel by observing at two frequencies. For example, SKYLAB's new dual frequency multi-mode positioning module SKG122S/SKG122Y/SKG123 and L1+L5 dual frequency positioning enable faster positioning, higher accuracy and more reliable product performance.
The chips are different: most SKYLAB single frequency GPS modules use MediaTek chip solutions, MT3337 and MT3339, while SKYLAB dual frequency GPS modules use Huada and Luda AG3335 chip solutions.
The frequency bands are different: the single frequency GPS module can only receive satellite signals in the GPS L1 band. While the dual frequency GPS module can simultaneously receive satellite signals in the GPS L1 and GPS L5 bands.
The positioning accuracy is different: the dual frequency GPS module can receive GPS L1 and GPS L5 satellite signals at the same time. By using the difference of dual frequency on the ionospheric delay, the influence of ionospheric delay on electromagnetic wave signals can be eliminated. In addition, the dual frequency
GPS module can speed up the ambiguity resolution of the whole cycle channel by observing at two frequencies. For example, the positioning accuracy of dual frequency multi-mode positioning module SKG122S/SKG122Y/SKG123 can reach about 1.5m. The L1+L5 dual frequency positioning makes the positioning faster, the accuracy higher and the product performance more reliable.
The timing accuracy is different: the timing accuracy of dual frequency GPS module is ± 20ns, ± 15ns. The timing and positioning of the single frequency GPS module is ± 30ns.
The GPS module in the gps car tracker device is equivalent to a satellite signal receiver. By continuously capturing and tracking satellite signals, according to the standard specifications of NMEA-0183 protocol, the GPS module transmits the received satellite information data to the gps tracker equipment through the UART serial port, and performs positioning calculation according to the data in a certain way to finally obtain the longitude and latitude, height, speed, time and other information required by the tachograph.
The dual frequency GPS module can simultaneously receive satellite signals in GPS L1 and GPS L5 frequency bands. By using the difference between dual frequency and ionospheric delay, the influence of ionospheric delay on electromagnetic wave signals can be eliminated. In addition, the dual frequency GPS module can speed up the ambiguity resolution of the whole cycle channel by observing at two frequencies. For example, SKYLAB's new dual frequency multi-mode positioning module SKG122S/SKG122Y/SKG123 and L1+L5 dual frequency positioning enable faster positioning, higher accuracy and more reliable product performance.
The chips are different: most SKYLAB single frequency GPS modules use MediaTek chip solutions, MT3337 and MT3339, while SKYLAB dual frequency GPS modules use Huada and Luda AG3335 chip solutions.
The frequency bands are different: the single frequency GPS module can only receive satellite signals in the GPS L1 band. While the dual frequency GPS module can simultaneously receive satellite signals in the GPS L1 and GPS L5 bands.
The positioning accuracy is different: the dual frequency GPS module can receive GPS L1 and GPS L5 satellite signals at the same time. By using the difference of dual frequency on the ionospheric delay, the influence of ionospheric delay on electromagnetic wave signals can be eliminated. In addition, the dual frequency
GPS module can speed up the ambiguity resolution of the whole cycle channel by observing at two frequencies. For example, the positioning accuracy of dual frequency multi-mode positioning module SKG122S/SKG122Y/SKG123 can reach about 1.5m. The L1+L5 dual frequency positioning makes the positioning faster, the accuracy higher and the product performance more reliable.
The timing accuracy is different: the timing accuracy of dual frequency GPS module is ± 20ns, ± 15ns. The timing and positioning of the single frequency GPS module is ± 30ns.
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