In daily RTK surveying and mapping work, the matter of "no fixed" within the radio mode plagues many surveying and mapping personnel, affecting measurement accuracy and measurement work progress. We glance for the breakthrough of the matter from the three aspects of RTK base station, RTK rover and link, which can assist you find how to unravel the matter to RTK quickly.
Solution for the base station:
From the signal transmitted by the satellite to the signal received by the receiver, there's interference from the ionosphere, troposphere, and multipath effects, leading to weak signals. The base station should be found out during a place with good viewing space, distant from strong electromagnetic interference sources (such as high-voltage lines, signal towers, etc.). Avoid large area signal reflectors (such as large areas of water, large buildings, etc.) round the base station to scale back the impact of multipath effects. Additionally, the radio aerial should be set at a distance of quite 2 meters from the base station to avoid UHF electromagnetic radiation interference.
Solution for the rover:
When the space between two points on the base is brief, the system can simulate the consequences of the ionosphere and troposphere, and therefore the residual effects also can be eliminated or reduced by differential processing of observations. However, drastic changes may occur within the air at any time, and therefore the satellite signals will have varying degrees of impact during they reach base stations and mobile stations, and the longer the baseline, the greater the impact. When the ionosphere is active, it'll cause cycle slip or loss of lock. When there's no fixed solution within the RTK measurement, it's mainly because the mobile station cannot determine the unknown number of the entire week, that is, initialize. The utilization of RTK in some special situations should be reduced, like measurement areas with strong interference and limited viewing space conditions. The mobile station shouldn't be more than 10 kilometers from the base station.
Solution the info link:
If the base station and therefore the mobile station are far apart, the correction number transmitted by the radio are going to be delayed, leading to a situation where a "fixed solution" can't be obtained. If you're using the RTCM3 format, you'll switch to a knowledge format with a comparatively bit of knowledge to scale back the delay. Additionally, within the measurement area where the terrain is unchangeable, the terrain is comparatively bad, and therefore the electromagnetic radiation transmission is poor, the radio aerial should be placed at a high place, and therefore the transmission power of the radio should be increased to enhance the info link. Learn more about RTK base station: https://www.satlab.com.se/product_category/gnss/
