Aliasing radar receiver in FMICW system

Abstract:To solve the problems of the major kinds of microwave radars to meet the ranging needs of vibrating constructions, a new type of radar system for ranging is proposed based on the carrier modulation and heterodyne phase difference detecting with time-to-digital converter (TDC). In the radar system, an intermediate frequency (IF) signal is used to modulate the amplitude of radio frequency (RF) carrier signal to produce transmitting signal, and radar system receives the back-reflected signal from the target and demodulates the IF signal to expand the unambiguous range. Then, the heterodyne processing and phase detector with TDC device are adopted to detect phase shift of IF signal for ranging to improve the ranging resolution and ranging speed. In addition, the ranging experiment results proved the feasibility and validity of the presented radar system.

Section: Experiments and Analysismentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A microwave radar system based on carrier modulation and heterodyne phase difference detecting with time-to-digital converter

Zheng

Chen

et al. 2014

“…Range resolving ability is provided by the frequency modulated interrupted continuous wave (FMICW) technique which is able to use the same antenna to translate and receive electromagnetic waves [5]. Range resolution can be readily varied between 5 and 15 m to suit different ocean status by simply changing the sweep bandwidth [6].…”

Section: System and Theorymentioning

confidence: 99%

Ocean wave directional spectrum measurement using microwave coherent radar with six antennas

Chen

Fan

Zhao

et al. 2012

An S-band Doppler radar, named MORSE (Microwave Ocean Remote SEnsor), has been developed by Wuhan University to measure ocean wave spectrum. Six narrow beam antennas are equipped to obtain directional wave height spectrum. Each of the antennas has a 3 dB bandwidth of 30 deg, and they are operated in time multiplex mode. The system was applied for a seven-day experiment on the coast of the East China Sea at the end of 2011. Directional wave height spectra are obtained and presented. The time-series of nondirectional wave spectrum and significant wave height fluctuate in the frequency of semidiurnal tide. This signature, consistent with ocean wave properties, suggests that MORSE has been able to measure the directional wave height spectrum.

“…Therefore, an ultra-high-speed long point correlation processor is needed in order to decrease processing time. There are many research have been done for real-time digital correlation or pulse compression, however because of high resource cost, the long point correlation processor with speed higher than 1 GHz is still challenging and with little research [1,2,3,4,5,6,7].…”

Section: Introductionmentioning

confidence: 99%

An ultra-high-speed FPGA based digital correlation processor

Altaf

Ahmad

Wei³

et al. 2015

This paper presents an ultra-high-speed correlation processor for FPGA (Field-Programmable Gate Array) which is based on MDF (multiplepath delay feedback) pipelined FFT (fast Fourier transform) architecture. In order to decrease the resource cost and processing delay, the FFT processor is based on DIF (Decimation in Frequency) decomposition method, and the IFFT processor is based on DIT (Decimation in Time) decomposition method. The data input and output of the correlation processor are both in natural order. The main clock speed of the processor FPGA implementation can be higher than 200 MHz and is able to process continuous complex input at more than 1.6 Gsps (giga samples per second).