Carlson is using the technologies that were invented right around the time she is writing -- Radar and Sonar -- to understand how bats navigate.

When Carson says that a bat "begins to send out his signals in a series of supersonic cries," she is using words that are used in the description of Radar, Sonar, and Echolocation which shows that she is thinking about how bats navigate by using Radar, Sonar, and Echolocation as models.