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Related Concept Videos

Leveling Equipment01:18

Leveling Equipment

As leveling involves measuring vertical distances relative to a horizontal line of sight, it requires a graduated rod, called a level rod, for vertical measurements and an instrument called a level for a horizontal sight line. A level includes a high-powered telescope with a mechanism for leveling to ensure the line of sight is horizontal when the bubble in the spirit level is centered. Leveling rods, made of wood, metal, or fiberglass, are graduated in feet or meters and commonly used in two-...
Introduction to Global Positioning System01:30

Introduction to Global Positioning System

The Global Positioning System (GPS) revolutionized positioning on Earth, providing precise location data through satellite ranging. The GPS system was developed in 1978 by the U.S. Department of Defense  for military use, and it became available for civilian applications in 1983, transforming fields including navigation, fleet management, and time synchronization for telecommunications systems.GPS consists of satellites in medium Earth orbit, about 20,200 kilometers above the surface,...
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device

Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point served as...
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

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 short distances...
Conversion of Units01:36

Conversion of Units

Sometimes, there is a need to convert from one unit to another one. For instance, reading a cookbook in which quantities are expressed in units of liters or ounces may require conversion of quantities to cups. Or, when looking up directions on how to get to a location, we may be interested to know how many miles we are going to walk. In this case, we would have to convert units of feet or meters to miles.
The first step in the unit conversion is to list the given units and the units required...

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Related Experiment Video

Updated: Jun 16, 2026

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
06:14

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Published on: July 30, 2020

Transportable lunar-ranging system.

C G Lehr, M R Pearlman, J A Monjes

    Applied Optics
    |January 30, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new transportable laser transmitter enables lunar distance measurements from any observatory with a large telescope. This system uses a neodymium-glass laser and coudé optics for improved accessibility in lunar ranging experiments.

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    Area of Science:

    • * Astronomy
    • * Laser Physics
    • * Geodesy

    Background:

    • * Ruby lasers in fixed installations are currently used for lunar distance measurements.
    • * International groups in France, Japan, the Soviet Union, and the U.S. utilize this technology.
    • * Existing systems require large, non-portable installations.

    Purpose of the Study:

    • * To describe a transportable laser transmitting unit for lunar distance measurements.
    • * To enable lunar ranging from any astronomical observatory with a large telescope.
    • * To enhance the flexibility and accessibility of lunar laser ranging operations.

    Main Methods:

    • * Development of a transportable neodymium-glass laser transmitter.
    • * Incorporation of a frequency-doubled laser for high radiance.
    • * Integration with a moderate-sized coudé optical system for signal detection.
    • * Installation at astronomical observatories with large telescope facilities.

    Main Results:

    • * A functional transportable laser transmitting unit has been developed.
    • * The unit has been installed at the Agassiz Observatory, Harvard.
    • * The system is ready for operation, pending further testing.

    Conclusions:

    • * The transportable unit offers a more flexible approach to lunar laser ranging.
    • * This technology can be deployed at various observatories, expanding research capabilities.
    • * The neodymium-glass laser system represents a significant advancement in portable lunar ranging equipment.