Title :
A 77-GHz FMCW radar using a digital phase-locked synthesizer
Author :
Wagner, Christoph ; Feger, Reinhard ; Haderer, Andreas ; Fischer, Alexander ; Stelzer, Andreas ; Jäger, Herbert
Author_Institution :
Christian Doppler Laboratory for Integrated Radar Sensors, Johannes Kepler University, Altenberger Str. 69, A-4040 Linz, Austria
Abstract :
A digital phase-locked synthesizer for application in a 77-GHz frequency modulated continuous wave (FMCW) radar is presented. It consists of a digital phase discriminator, a digital loop filter, highpass modulation, and predistortion of the VCO tuning characteristic. An additional feature is the ability to store the previous phase errors for iterative adaptation of the loop filter coefficients and the highpass modulation parameter. A radar system has been built to compare the proposed digital synthesizer to an offset-loop based one in actual radar measurements.
Keywords :
CW radar; FM radar; digital phase locked loops; millimetre wave devices; FMCW radar; digital loop filter; digital phase discriminator; digital phase-locked synthesizer; frequency 77 GHz; frequency modulated continuous wave radar; highpass modulation; loop filter coefficients; Continuous phase modulation; Digital filters; Digital modulation; Frequency modulation; Frequency synthesizers; Phase modulation; Predistortion; Radar applications; Radar measurements; Voltage-controlled oscillators; 77 GHz; Digital PLL; FMCW radar;
Conference_Titel :
Microwave Symposium Digest, 2008 IEEE MTT-S International
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-1780-3
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2008.4633175
