Title :
Frequency measuring method using AD converters with different sampling frequencies
Author :
Usui, Ryuzaburo ; Uera, Yasukichi ; Fujisaka, Takahiko
Author_Institution :
Inf. Technol. R&D Center, Mitsubishi Electr. Corp., Kanagawa, Japan
Abstract :
For an AD converter, it is necessary to convert the analog signal into a digital one with a sampling frequency of 2 times the maximum Doppler frequency. In lightwave Doppler radar, the Doppler frequency of a target is several hundred MHz, so a high speed AD converter is needed. But its cost is very high, making the system cost higher so that high speed devices which meet the sampling frequency requirement become necessary for peripheral circuits. This paper proposes a method of measuring the Doppler frequency that is higher than the sampling frequency using low speed AD converters
Keywords :
Doppler radar; analogue-digital conversion; frequency measurement; optical radar; radar signal processing; signal sampling; frequency measuring method; high Doppler frequency measurement; high speed AD converter; high speed devices; laser radar; lightwave Doppler radar; low speed AD converters; maximum Doppler frequency; peripheral circuits; sampling frequencies; system cost; Analog-digital conversion; Costs; Doppler radar; Frequency conversion; Frequency measurement; Laser radar; Radar measurements; Sampling methods; Velocity measurement; Wavelength measurement;
Conference_Titel :
Signal Processing, 1996., 3rd International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-2912-0
DOI :
10.1109/ICSIGP.1996.567050
