DDS-Based Signal-Generation Architecture Comparison for an Imaging Radar at 300 GHz

Rubio-Cidre, Gorka; Badolato, Alejandro; Úbeda-Medina, Luis; Grajal, Jesús; Mencia-Oliva, B.; Dorta-Naranjo, B. Pablo

doi:10.1109/tim.2015.2440557

Cited by 48 publications

(22 citation statements)

References 36 publications

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“…The second and third column show the corrected echoes when the target located at 0.6 m and 0.9 m, respectively. It is noted that in order to evaluate the correction effect for nonlinearity, the phase noise and the thermal noise, which are the other two main factors that degrade the range profile [30], were not included in this simulation. And that, in order to reduce the side lobes, Hanning window was added before the FFT in this paper.…”

Section: A Simulation Resultsmentioning

confidence: 99%

“…Thus, the nonlinearity of VCO is degraded by the increase of sweeping bandwidth. Besides, the nonlinearity of THz broadband devices could not be neglected [25,26,[28][29][30] because of their drastic group delay jitter [31][32][33][34], especially for electron devices like frequency multiplier and harmonic mixer in our system.…”

Section: A Modefied Nonlinear Signal Modelmentioning

confidence: 99%

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A Non-Linear Correction Method for Terahertz LFMCW Radar

Zhang

et al. 2020

IEEE Access

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The nonlinearity in terahertz (THz) linear frequency modulated continuous wave (LFMCW) radar usually blurs the range profile and decreases the signal to noise ratio, hampering applications where high range-resolution is particularly emphasized. A software correction method, which comprises of transmitted nonlinearity estimation and nonlinear phase compensation for the beat signal, is proposed in this paper to drastically reduce the nonlinearity in THz LFMCW radar. Besides the commonly considered nonlinearity caused by voltage-controlled oscillator (VCO), the nonlinearity from other broadband hardware devices have also been included in our modified correction model, which gives the advantage of preciser compensation. Moreover, utilizing the phase gradient autofocus (PGA) method to estimate the transmitted nonlinear term and the residual video phase (RVP) removal method to remove the range dependency of the received nonlinearity, our method can uniformly compensate the nonlinearity in the whole range profile. In addition, no presupposed parametric model for the nonlinearity waveform is needed, which further strengthens the effectiveness of the proposed method in practical use. Both the simulated data and the real tested data, acquired by a 190 GHz radar with 60 GHz bandwidth, has been used to demonstrate the validity and the effectiveness of the method. INDEX TERMS linear frequency modulated continuous wave (LFMCW), nonlinearity correction, phase gradient autofocus (PGA), residual video phase (RVP) removal, range profile, terahertz (THz) radar.

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Section: A Simulation Resultsmentioning

confidence: 99%

Section: A Modefied Nonlinear Signal Modelmentioning

confidence: 99%

A Non-Linear Correction Method for Terahertz LFMCW Radar

Zhang

et al. 2020

IEEE Access

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“…This has been the case in recent works and prior art, such as [6]- [8]. Similarly, a radio frequency (RF) f REF can be provided by direct digital synthesis, which has been demonstrated in several state-of-theart sub-millimeter frequency imaging radar systems [9]- [11]. Increasing f REF is beneficial for the PLL noise performance, because when the f REF noise is added to the PLL in-band noise it is first multiplied by the PLL division ratio squared.…”

mentioning

confidence: 88%

A 10-mW mm-Wave Phase-Locked Loop With Improved Lock Time in 28-nm FD-SOI CMOS

Abdulaziz

Forsberg

Törmänen

et al. 2019

IEEE Trans. Microwave Theory Techn.

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“…Compared with the traditional frequency synthesis technology, DDS has the advantages of short frequency conversion time, high frequency resolution, easy integration, high reliability and easy debugging [7]- [10]. With the continuous improvement of DDS technology, its application fields are more and more extensive, such as aerospace, surveying and mapping, guidance, satellite positioning and high-speed communications and other high-tech fields, just as shown in Fig.1 [11]- [14].…”

Section: Introductionmentioning

confidence: 99%

A Suppressing Method for Spur Caused by Amplitude Quantization in DDS

Tang

Hou

2019

IEEE Access

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Direct digital synthesis (DDS) technology is widely used in navigation, communications, aerospace, and other fields. Due to the technical limitations in the process of DDS digitization, the output spectrum of DDS is inevitably spurious. In order to meet the requirement of the pure frequency reference signal for modern instrument or equipment, it is necessary to correctly analyze the spur of DDS and effectively suppress it. In this paper, the causes of the spur in traditional DDS are analyzed, and a piecewise linear approximation method is proposed to suppress the amplitude quantization spur of DDS. In order to verify the effectiveness of the proposed spurious suppression method in this paper, the MATLAB simulation is carried out and a field programmable gate array (FPGA) hardware platform for DDS is developed. The simulation and actual test results prove the feasibility of this method. In the limited storage space, this method improves the accuracy of amplitude quantization, reduces spurs, and enhances the accuracy of synthetic frequency.

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DDS-Based Signal-Generation Architecture Comparison for an Imaging Radar at 300 GHz

Cited by 48 publications

References 36 publications

A Non-Linear Correction Method for Terahertz LFMCW Radar

A Non-Linear Correction Method for Terahertz LFMCW Radar

A 10-mW mm-Wave Phase-Locked Loop With Improved Lock Time in 28-nm FD-SOI CMOS

A Suppressing Method for Spur Caused by Amplitude Quantization in DDS

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