Sensitive detection of narrowband pulses.

Area of Science:

• Astrophysics
• Signal Processing
• Electrical Engineering

Background:

• Highly monochromatic signals are typically detected using narrow filters and power accumulation.
• Low-duty-cycle pulsed signals present a unique detection challenge compared to continuous signals.

Purpose of the Study:

• To develop a more sensitive method for detecting low-duty-cycle pulsed signals.
• To assess the suitability of pulsed signals as potential extraterrestrial beacons for SETI.

Main Methods:

• Utilized a square law device followed by thresholding and a novel algorithm.
• Compared the sensitivity of the new method against traditional narrow-band filtering for pulsed signals.

Main Results:

• The proposed method achieved approximately 7 dB greater sensitivity for low-duty-cycle pulsed signals compared to continuous monochromatic signals.
• Identified pulsed signals from rotating beacons as strong candidates for extraterrestrial communication.

Conclusions:

• The developed signal detection algorithm offers enhanced sensitivity for pulsed signals.
• This method is promising for SETI applications, particularly for detecting extraterrestrial beacons.
• Software is ready for field testing with the NASA Multichannel Spectrum Analyzer (MCSA).