Related Experiment Video
Updated: Jan 17, 2026
08:09
Measuring and Mapping Patterns of Soil Erosion and Deposition Related to Soil Carbonate Concentrations Under Agricultural Management
Published on: September 12, 2017
12.3K
Differential dual-comb ranging for a kilometer-scale geodetic baseline
Optics Express
|September 23, 2025
Summary
This study introduces a differential dual-comb ranging system for precise geodetic baseline calibration. It achieves sub-millimeter accuracy over kilometer scales, vital for advanced length standards and geographic information systems.
Area of Science:
- Geodesy
- Metrology
- Optical Engineering
Background:
- Accurate calibration of kilometer-scale geodetic baselines is essential for modern length standards.
- Advancements are needed for high-precision geographic information framework construction.
Purpose of the Study:
- To present a novel differential dual-comb ranging system for high-precision geodetic baseline calibration.
- To demonstrate sub-millimeter accuracy in kilometer-scale measurements.
Main Methods:
- Utilized a differential dual-comb ranging system with two repetition-rate-stabilized resonators.
- Employed a dual-channel fiber-optic configuration for dual-comb ranging.
- Applied an amplitude triggering method for outdoor distance measurements to mitigate air disturbances.
Main Results:
- Achieved 8.2 µm accuracy at 70 m in indoor experiments, validated against a length standard.
- Demonstrated 0.13 mm reproducibility over a 1.2-km outdoor geodetic baseline across two tests.
- Constrained the terminal point standard deviation to 23.4 µm in outdoor measurements.
Conclusions:
- The developed system offers high precision and reproducibility for kilometer-scale geodetic baseline calibration.
- The system is suitable for advancing large-scale length standards and geographic information frameworks.
- The amplitude triggering method effectively addresses signal variations caused by outdoor air disturbances.
Related Concept Videos
01:12Differential Leveling
660
Differential leveling is a precise method in surveying used to determine the elevation difference between two points. Its primary goal is to establish accurate vertical measurements to create level surfaces or grade lines critical for designing and constructing infrastructures such as roads, bridges, and buildings.The procedure for differential leveling begins with setting up and leveling the instrument at a point where the benchmark can be seen. The level rod is held on the benchmark (BM), and...
660
01:30Electronic Distance Measuring Instruments
465
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
465
01:10Design Example: Measuring Distance Between Two Points with Obstructions
389
When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
389
01:17Common Leveling Mistakes and Errors
406
A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...
406
01:26Transmission-Line Differential Equations
967
Transmission lines are essential components of electrical power systems. They are characterized by the distributed nature of resistance (R), inductance (L), and capacitance (C) per unit length. To analyze these lines, differential equations are employed to model the variations in voltage and current along the line.
Line Section Model
A circuit representing a line section of length Δx helps in understanding the transmission line parameters. The voltage V(x) and current i(x) are measured from...
Line Section Model
A circuit representing a line section of length Δx helps in understanding the transmission line parameters. The voltage V(x) and current i(x) are measured from...
967
01:18Distance Measurements by Taping
418
Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
418