Core parameters: How to evaluate the RTK performance?
(1) Accuracy class
Horizontal accuracy: 1cm + 1ppm (typical RTK indicator)
Elevation accuracy: 1.5cm + 1ppm (slightly lower than horizontal accuracy)
Pay attention to:
- "1ppm" represents 1mm of error per kilometer, considering long distance operations.
- The actual accuracy is affected by the base station distance and the ionosphere.
(2) Satellite system support
Multi-star multi-frequency:
BeiDou：B1I、B1C、B2a、B2b、B3I
GPS：L1、L2、L5
GLONASS：G1、G2、G3
Galileo：E1、E5a、E5b、E6
QZSS/IRNSS：L1、L5、S
Minimum frequency band requirements: at least support Beidou + GPS dual frequency (B1 / L1 + B2 / L2)。
(3) Data link mode
Network RTK: wide coverage (4G signal required) depends on CORS account
Radio UHF: No network available (<20km) distance limited
(4) Other key features
Ineritent guide (IMU): tilt measurement (not vertical to the middle bar), suitable for building facade survey.
IP grade: at least IP67 (dust and waterproof), essential for outdoor work.
Battery life: single battery 8 hours, support hot plug is better.
WEB UI:The main advantage is that the WIFI can download static data.
NFC:One-click connection, no search and pairing.
(5) Guides to avoid pits
Do not blindly pursue low price, some low price RTK use single frequency chip, the fixed rate is very low in complex environment.
It is recommended to choose at least dual-frequency (such as Beidou B1 + B2).
(6) Pay attention to after-sales service
After purchasing Gnss Equipment, aftermarket warranty is the key to ensure long-term and stable use.
It is recommended to purchase GNSS equipment from the original factory or the local distributor, otherwise the warranty and after-sales service can not be well guaranteed. Priority for "free software upgrade" vendors.
GNSS equipment is a high-value professional tool, and good after-sales service can greatly reduce the risk of use. It is recommended to choose brands with perfect local service outlets and fast response, and keep complete purchase certificates.
We, APEKSGNSS, is a professional GNSS equipment manufacturer. Our Gnss Receiver is an affordable all-around device. Our vision is to provide surveyors with high specification, functional and affordable equipment. Therefore, you don't have to spend too much time comparing and choosing with a headache.