How frequency hopping suppresses pulse-echo ambiguity in bat biosonar
Abstract
The wide frequency spectrum of FM bat biosonar sounds enables accurate perception of echo delay (target distance) by contributing numerous delay estimates across frequencies. However, bats require the lowest frequencies in the broadcast to be present in echoes for all higher frequencies to contribute, too. By incorporating this feature into an existing auditory model of FM biosonar, the model can reject echoes that lack the lowest frequencies in the most recent broadcast, thus suppressing echoes of an earlier broadcast that has slightly higher low-end frequencies. This biologically inspired method adopts the bat’s frequency-hopping technique to suppress pulse-echo ambiguity in wideband systems, a serious problem for man-made wideband radar and sonar systems.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 06, 2020
- Source ID
- 10.1073/pnas.2001105117
Entities
People
- Chen Ming
- James A Simmons
- Mary E Bates
Organizations
- Brown University
- Office of Naval Research