ECE 6390 Radiolocation Scavenger Hunt 1SARSAT Rescue!Georgia Institute of Technology1 IntroductionAccording to radio transmissions intercepted by other trans-Atlantic pilots, a large commercial jethas made a crash-landing somewhere in the Atlantic ocean. Its last known bearing and location arerelatively sketchy; the only trace of the plane is an EPIRB that has been activated and received by aSARSAT satellite riding down the −76.0◦longitude line. Based on the satellite’s received waveform,your engineering team must provide a “best estimate” of where the jet crashed so that the CoastGuard can be dispatched.2 Technical DataThe figure below is a snapshot of the SARSAT’s measured carrier frequency as a function of time.This particular satellite is making an upwards orbital swing (from south to north) and is preciselyriding the −76.000◦longitude line during this recorded period. The time t = 0s corresponds to themoment that the satellite has crossed the equator. The raw data (time in seconds and frequency inHz) are tabulated in an ASCII file that has been posted on the project website.0 100 200 300 400 500 600 700 800 900405.99405.992405.994405.996405.998406406.002406.004406.006406.008406.01Measured Doppler Frequencytime (s)Frequency (MHz)3 DeliverablesYou must prepare a web-based report or presentation that documents your solution to this prob-lem. Other search-and-rescue workers will hopefully use your documented solution to operate moreefficiently in the future. Keep in mind that there are other independent teams of engineers workingon this problem (who you do not believe are as competent or as ethical as your team), so the webreport must look good and “sell” your solution in addition to being technically correct. The webreport should be in html-format with all files submitted in-class on a CD or through e-mail1.Yourreport will be graded completeness, technical writing, technical correctness, professional content,and creative use of web presentation. I will likely post a couple unique solutions and high-qualityprojects to the web.Some interesting questions to address in your final web report/presentation:• Are there any ambiguities in your technique? How might these be addressed?• Can you place a confidence interval on your position estimate?• How might a receiver measure carrier frequency?4 Final ClueThe actual longitude/latitude of the EPIRB is very close to an island in the Atlantic. The name ofthe island will help you in your next RLSH assignment.1e-mail submissions must be ZIPped and are only recommended for files less than 2 MB
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