Short baseline acoustic positioning system

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/short-baseline-acoustic-positioning-system

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the primary principle?Measurement of acoustic signal travel times (time-of-flight) between a transducer and transponders
2. What is the key components?Surface vessel-mounted primary acoustic array and deployed transponders on underwater assets
3. How does the system find the position of a submarine or robot?The boat’s speaker sends a sound pulse that travels through the water. The robot’s transponder receives the pulse and replies with its own sound. The boat measures the travel time, uses the speed of sound, and applies math to pinpoint the robot’s 3‑D position.
4. Why does the speed of sound matter for this system?Because the distance calculation depends on how fast the sound moves. Temperature, saltiness, and pressure change the speed, so the system must know the current speed to be accurate.

Time-of-Flight (TOF): The duration it takes for an acoustic signal to travel between two points.
Trilateration/Multilateration: Geometric methods used to determine a position based on distances to known points.
Multipath Propagation: The phenomenon where acoustic signals travel along multiple paths due to reflections, causing signal distortion.