System and method to improve range accuracy in FMCW radar using FSK modulated chirps

US10718860B2 · kind B2 · utility

Assignee

• Infineon Technologies AG · DE

Inventors

• Avik Santra · Irvine, US
• Thomas Finke · Gilching, DE
• Johann Peter Forstner · Ebersberg, DE

Key dates

• Filing date: Jan 11, 2018
• Grant date: Jul 21, 2020
• Expiry date: Jan 21, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S7/356
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for determining the range of an object includes transmitting successive radar chirps, adding a frequency offset to the successive radar chirps, the frequency offset being a fraction of a range frequency bin, receiving return signals, constructing frequency transforms from each of the return signals, adding each of the frequency transforms together to create a composite frequency transform, and interpolating the range of the object from a frequency peak detected in the composite frequency transform.