The Acquisition Method of Symmetry Chirp Signal Used in LEO Satellite Internet of Things

Chirp signal has been used in some fields, like radar and sonar. In recent years, the symmetry chirp signal (SCS) is a kind of revised Long Range (LoRa) chirp signal and proposed to be used in low-earth-orbit (LEO) satellite Internet of Things (IoT) for low-data-rate transmission. However, in terms of the complexity and performance, the traditional acquisition methods to capture SCS (time delay and frequency offset acquisition) will have some limitations in LEO satellite IoT. Thus, this letter presents a new acquisition method to balance the complexity and performance for SCS.