LG290p: RTK Inquiry with Wide-Line and Extra-Wide-Line Methods
I’m researching RTK corrections with the LG290p at long distances from a base station, specifically between 80 and 200 km. I’ve obtained very acceptable results with multi-constellation base stations. I’d like to access more information about the LG290p regarding the use of wide-line and extra-wide-line methods in the RTK engine. Do you have any resources on this?
Regards, Angel
Hello, Quctel team.
I’m waiting for your response regarding the issue I raised.
I found a command for this: PQTMCFGRTKSCRTYPE. It can now have values of 0, 1, and 2.
0 is automatic, 1 is normal, and 2 is wide line.
I need clarification on what distance the wide line option starts working if I set it to auto.
The other important thing is to know which frequencies are combined in wide line mode and from which constellation.
I would appreciate a prompt response, as my research depends on it.
Regards, Angel
Hi @amlago
For the LG290P (03) and related RTK variants, here are the details regarding the $PQTMCFGRTKSRCTYPE command and the functionality of the “Wide Lane” mode:
1. Command Summary: $PQTMCFGRTKSRCTYPE
This command is used to set or get the RTK differential source type used by the navigation engine.
2. Wide-lane Working Distance in “Auto” Mode
The sources do not explicitly define a hard distance threshold (e.g., “starts at 10 km”) for when the “Auto” mode transitions from narrow-lane to wide-lane. Instead, the “Auto” setting allows the internal RTK engine to dynamically switch based on the real-time quality of observations and the convergence of carrier-phase ambiguities.
However, the sources provide general operational guidelines for baseline distances in RTK:
3. Constellations and Frequencies in Wide Lane Mode
The LG290P (03) is a multi-constellation, quad-band module. Wide-lane mode leverages the fact that the module tracks multiple frequencies within a single constellation to create a signal combination with a much longer wavelength than L1 alone.
Based on the LG290P (03) supported signal bands , the following frequencies are utilized for multi-band RTK calculations:
| Constellation | Frequency Bands Supported for RTK/Wide-lane |
|---|---|
| GPS | L1 (C/A, C), L2C , and L5-Q |
| Galileo | E1 , E5a , E5b , and E6 |
| BDS | B1 (I, C), B2 (a, b, I), and B3I |
| GLONASS | G1 C/A and G2 C/A |
| QZSS | L1 (C/A, C), L2C , L5-Q , and L6 |
| NavIC | L5 |
In “Wide Lane” mode, the module combines these frequencies (such as GPS L1 and L2 or L1 and L5) to calculate ambiguities. This increases the effective wavelength (e.g., to ~86 cm for GPS L1/L2), which helps the module maintain a fix even when atmospheric errors or distance make narrow-lane (~19 cm) solutions unreliable.
Summary Recommendation: If your baseline is consistently short (< 10 km), keeping the setting at Auto (0) or Normal (1) is standard. If you are operating at the edge of the module’s range (near or above 20–30 km), you may find that forcing Wide Lane (2) helps maintain a fix, though narrow-lane solutions are generally more precise once a fix is achieved.
Best Regards,
Hi. Thank you, but that information is too general I don’t need the theory. I want to confirm specific details about the LG290p. Does it perform all frequency combinations, or just some? There must be more precise information about the automatic mode. I need some more in-depth material or resources in PDF format than just the guide. Can you help me?
Thanks
Hi @amlago please refer to these documentations.
Best Regards.
Hello.
I’m not sure if you understand what I need.
In previous messages, I asked for specific technical data about the changes in differential RTK mode.
For example, if I’m in Auto mode (0), I want to know what specific data (distance, reported accuracy, etc.) determines whether it switches from normal mode (1) to wide-lane mode (2).
I need the actual data for the LG-290p, not the general and theoretical data that I already know.
I want to know which frequencies it actually combines for wide-lane effects.
Could you consult the technical department about my answers? Is what I’m asking clear?
Regards
Hi @amlago Currently, the required test environment is not available for validation. This feature was developed based on the requirements of an overseas customer who provides the required wide-lane differential correction data.
In Automatic mode, the received correction data is automatically identified as either standard RTK correction data or dedicated wide-lane correction data.
The frequency combinations used for the wide-lane solution are determined by the frequencies available in the received correction data source during testing and the frequencies supported by the LG290P. If the frequencies are supported by both the correction data source and the LG290P, all available frequencies will be utilized by the algorithm.
Best regards,
Hello.
You’re still sending me general information.
I understand what you’re saying about the function’s development.
Even so, I assume it must be well-documented in some internal repository, and I’m still interested in that data for research purposes related to resolving very long baselines using the LG290p.
For example, I presented a poster at the IGS 2026 Workshop in Chile on Galileo HAS corrections, where one of the teams had the LG290p, and their results were very good.
With this as background, I’m still asking if it’s possible to access more technical material about the function, in order to continue my research on ultra-long baselines using the LG290p.
Thank you very much.
Regards,
Angel