Title :
Direct digital generation of ultra-wideband LFM signal and its compensation technology
Author :
Sheng Mengmeng ; Liu Haibo ; Wang Junfu ; Jiang Han
Author_Institution :
Radar Res. Lab., Beijing Inst. of Technol., Beijing, China
Abstract :
The linear frequency modulated signal is widely used in radar systems, and two methods, which are DDS and DDWS, are mainly used to generate the baseband signal. This system adopts the DDWS method, based on FPGA parallel theory and high-speed DAC framework, to generate the broadband linear frequency signal with bandwidth of 500MHz. The principle of filter-based pre-distortion compensation presented in the paper is used for the amplitude and phase compensation of system, and the ration of the main lobe to the side lobe after pulse compression has a significant improvement. Detailed steps about the implementation are given in this paper.
Keywords :
FM radar; direct digital synthesis; distortion; field programmable gate arrays; filtering theory; pulse compression; radar signal processing; DAC framework; DDS; DDWS; FPGA parallel theory; amplitude compensation; baseband signal; compensation technology; direct digital generation; direct digital synthesis; direct digital waveform synthesis; filter-based predistortion compensation; frequency 500 MHz; linear frequency modulated signal; phase compensation; pulse compression; radar system; ultra-wideband LFM signal; direct digital waveform synthesis (DDWS); filter; liner frequency modulation (LFM); the compensation of amplitude and phase pre-distortion;
Conference_Titel :
Radar Conference 2013, IET International
Conference_Location :
Xi´an
Electronic_ISBN :
978-1-84919-603-1
DOI :
10.1049/cp.2013.0383
