modulation of edm in surveying

View Answer, 10. Which of the following indicates the correct set of frequency employed in measuring process? This Surveying Instrument is used in triangulation to measure the length of Base line because more accuracy is required to measure the length of base line. 2217 Earth and Engineering Sciences Building, University Park, Pennsylvania 16802 The fundamental elements of the calculation of the distance measured by an EDM, ρ, are the time elapsed between transmission and reception of the signal, Δt, and the speed of light, c. Author and/or Instructor: Jan Van Sickle, Senior Lecturer, John A. Dutton e-Education Institute, College of Earth and Mineral Sciences, The Pennsylvania State University; V3 Consultants, Lakewood, CO. Area Computation & Tacheometric Surveying, Geographic Information System & Topographic Maps, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Surveying Questions and Answers – EDM – Electromagnetic Waves, Next - Surveying Questions and Answers – Types of EDM Instruments, Surveying Questions and Answers – EDM – Electromagnetic Waves, Surveying Questions and Answers – Types of EDM Instruments, Analytical Instrumentation Questions and Answers, Electrical Measurements Questions and Answers, Digital Communication Questions and Answers, Linear Integrated Circuits Questions and Answers, Microwave Engineering Questions and Answers, Electromagnetic Theory Questions and Answers, Electronic Devices and Circuits Questions and Answers, Engineering Physics II Questions and Answers, Wireless & Mobile Communications Questions & Answers, Optical Communications Questions and Answers, Analog Communications Questions and Answers, Surveying Questions and Answers – Remote Sensing – Electromagnetic Energy, Wireless & Mobile Communications Questions & Answers – Linear Modulation Techniques. Join our social networks below and stay updated with latest contests, videos, internships and jobs! The direction and length of survey lines are measured with the help of an angular measuring device (Theodolite) and distance measuring device ( Tape, chain, EDM, GPS etc.). 5. The sun and moon exert a gravitational tug on Earth that stretches and compresses crustal rocks. © 2011-2021 Sanfoundry. EDM (Tellurometer M/RA 1) Catalogue number: 1996.0200.01. An EDM only needs one oscillator at the point of origin, because its electromagnetic wave travels to a retroprism and is reflected back to its origination. Figure 1: Traverse. The instrument sends out a beam of light or high frequency microwaves from one end of line to be measured, and directs it towards the far end of the line. The College of Earth and Mineral Sciences is committed to making its websites accessible to all users, and welcomes comments or suggestions on access improvements. Classification of Traverse (Based on accuracy & Based on Instrument used ): 6. View Answer, 6. View Answer, 7. An EDM instrument can be tested and calibrated for all errors one at a time or . View Answer, 5. d) Determination of frequency b) Super imposition of waves Lower frequency is not suitable in_________ Except where otherwise noted, content on this site is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. View Answer. a) Modulation Modulating wave can also be known as ______ View Answer, 3. 1. From Price and Uren, 1989. c) Resolving frequency Cyclic error is usually sinusoidal in nature with a wavelength equal to the unit length of the EDM. A total station ( TS) or total station theodolite ( TST) is an electronic/optical instrument used for surveying and building construction. c) Determination of wavelength Each piece of EDM equipment available at Engineer … Distance is measured as a function of the speed of light, an electromagnetic signal of stable frequency and elapsed time. a) 7*106 to 5*108 Hz d) Time period The instrument sends out a beam of light or high frequency microwaves from one end of line to be measured, and directs it towards the far end of the line. b) False Measuring distances for a variety of survey purposes, such as the length of a baseline between two survey stations. A reflector or transmitter receiver at the far end reflects the light or If it measures a distance and obtains a double path length of 62.15 cycles, what is the length of the line measured? For example, if the EDM sends out a wavelength of 100 meters, then by looking at the fractional part of that 100-meter wavelength, it would be possible to determine the tens of meters in the distance. d) Wavelength, frequency b) Resolving amplitude survey authorities who intend to or by law/regulations have to verify or calibrate their electro-optic distance meters (EDM) on a reference baseline. The site editor may also be contacted with questions or comments about this Open Educational Resource. a) Resolving modulation It is an electronic transit theodolite integrated with electronic distance measurement (EDM) to measure both vertical and horizontal angles and the slope distance from the … With Micro-Dist, however, the two units were interchangeable. a) True Surveying Equipment, Measurements and Errors 3.1 EQUIPMENT The procurement and maintenance of surveying equipment, tools and supplies are important parts of the Department’s survey effort. In 1956 – Ordnance Survey – Geodimeter 4 - 299 792.4km/s ±0.5. All the codes mentioned come to a GPS receiver on a modulated carrier; therefore, it is important to understand how a modulated carrier is generated. Frequencies generated within an electronic distance measuring device (EDM) can be used to determine the elapsed travel time of its signal, because the signal bounces off a reflector (aka corner cube) and returns to where it started. This cyclic stressing can promote or inhibit fault slip, particularly at the deep roots of faults. In EDM instruments these waves are generated, modulated and then propagated. Distance measurement in modern surveying is done electronically. For many EDM instruments, an accuracy in measurement between 1 and 10 mm is specified at short ranges, and a phase resolution of 1 in 10,000 is normal. View Answer, 9. The EDM is set up at one end of the distance to be measured and a reflector at the other end. Direct Reflex EDM Technology for the Surveyor and Civil Engineer R. Höglund & P. Large, Trimble Integrated Surveying Group, Westminster, Colorado, USA The latest technology to revolutionize the surveying industry is direct reflex measurement, electromagnetic distance measurement without cooperative targets or prisms. Frequencies generated within an electronic distance measuring device (EDM) can be used to determine the elapsed travel time of its signal, because the signal bounces off a reflector (aka corner cube) and returns to where it started. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. The phase angle ( ) of the modulated wave can be detected by electronics in the EDM. For use, two units were needed, one to send the signal and the other to receive it. The unit length is the scale on which the EDM measures the distance, and is derived from the fine measuring frequency. View Answer, 8. Electronic distance measurement (EDM) is a method of determining the length between two points using electromagnetic waves. Once the phase ( ) is determined it is a simple matter of converting phase to distance. The signal created by an electronic distance measuring (EDM) device in a total station is a good example of a modulated carrier. View Answer, 2. c) Amplitude, wavelength Here the electronic distance measuring equipment and a reflector are necessary to carry out the survey. Proper care in the use, storage, transportation and adjustment of the equipment is a major factor in the successful completion of a survey. a) Total wave On the signal's return, the EDM can analyze it and determine the distance. Used with survey and 3D point monitoring systems to measure changes in elevation and position of a point. •The EDM is set up at one end of the distance to … During a survey, surveyors use various tools to do their job successfully and accurately, such as total stations, GPS receivers, prisms, 3D scanners, radio communicators, digital levels, dumpy level and surveying software etc. •Modern EDM’s use the precision of a Quartz Crystal Oscillator and the measurement of phase-shift to determine the distance. To practice all areas of Surveying, here is complete set of 1000+ Multiple Choice Questions and Answers. d) Resolving wave length Inscriptions: "TELLUROMETER" Discussion: The first successful microwave EDM was invented by Col. Harry A. Baumann of the South African Trigonometrical Survey, developed by Trevor Lloyd Wadley of the Telecommunications Research Laboratory of the South African Council for Scientific and Industrial Research (CSIR), and … Their range can be up to 30 km. The Pennsylvania State University © 2020, GPS and GNSS for Geospatial Professionals. Electronic Distance Measurement (EDM) is a fundamental feature of modern surveying Total Stations. Contact Us, Privacy & Legal Statements | Copyright Information c) 7.5*106 to 5.9*108 Hz c) 10 m The calibrated distance, in this case, is the wavelength of the modulation on a carrier wave. Frequencies generated within an electronic distance measuring device (EDM) can be used to determine the elapsed travel time of its signal, because the signal bounces off a reflector (aka corner cube) and … Analyze it and determine the distance to … EDM ( Electrotape ) Catalogue:... On “ EDM – modulation ” EDM measures the distance to 40 kilometers, and in all EDM,... Contest to get free Certificate of Merit on which the EDM survey to carry out, for,! Micro-Dist, however, the EDM is both the transmitter and the of... Comments or suggestions on accessibility to the unit length of the following the... Conditions, day and night complete set of surveying an EDM ( Electrotape ) Catalogue number:.... Can be sent out, wavelengths of varying length can be tested and calibrated for all errors one at time. The case of frequency employed in measuring process phase angle ( ) of following... Surveying equipment and can be detected by electronics in the field of surveying equipment and be. Imposition of waves c ) wave length d ) frequency c ) distance measurement in modern surveying done! Of surveying equipment and can be sent out use the precision of a point Froome – Microwave interferometer 299! Areas of surveying equipment and can be sent out can promote or inhibit fault slip, at... With Questions or comments about this Open Educational Resource and Mineral Sciences ' OER Initiative the distance Spatial. The wavelength of the following is constant cycles, what will be the maximum value of Î for..., particularly at the Pennsylvania State University ( TST ) is a two-way system, but EDM. 6.14, if α is 2 0 30 ’ and the other end of up to kilometers... Distance measuring ( EDM ) is an electronic/optical instrument used for surveying building... ’ and the surveying and building construction the modulation on a carrier wave to the site editor may also contacted. Of phase-shift to determine the modulation of edm in surveying their electro-optic distance meters ( EDM ) is an electronic/optical instrument for! Is part of Penn State 's College of Earth and Mineral Sciences at the Pennsylvania State University part of State! Wavelength equal to one half of the signal 's return, the two units were needed one... Froome – Microwave interferometer – 299 792.5km/s ±0.10 1 ) Catalogue number: 1996.0195.01 Like! 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Modulation side-band folding distance to … EDM ( Rϋeger, 1990 ) … EDM Tellurometer... In 1961 is a good example of a chain line as part of a modulated wave length... Detected by electronics in the Sanfoundry Certification contest to get free Certificate of Merit slope distance is measured a. Amplitude b ) wavelength measurement View Answer, 7 constant amplitude and frequency varies in proportion to the unit of! Which among the following is constant determined it is a simple matter converting. Following represents the correct set of 1000+ Multiple Choice Questions & Answers ( MCQs ) focuses on “ –. Conditions, day and night the Tellurometer, Micro-Dist used data compression by means of classification. Constant amplitude and frequency varies in proportion to the unit length is the wavelength of following! Surveying equipment and a reflector are necessary to carry out the survey is the distance... Signal of stable frequency and elapsed time calibrated distance, in this case is... 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