Showing 1-25 of 23,728 resultsfor "Index Terms":Phase Compensation
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A Dynamic Phase Error Compensation Technique for Fast-Locking Phase-Locked Loops
This paper presents a fast-locking technique for phase-locked loops (PLLs). In the proposed technique, the polarity and magnitude of the phase error at the phase-frequency detector (PFD) input is continuously monitored during the locking process. The detected phase error is then coarsely compensated by dynamically changing the divide ratio of the frequency divider. The proposed method allows the P...Show More
Amplitude and phase error estimation and compensation technology for spaceborne SAR
Shao Zelong;Qian Cheng;Ji Weiwei;Xu Xianwen;Li Chao;Ouyang Shangrong
2022 3rd China International SAR Symposium (CISS)
Year: 2022 | Conference Paper |
Cited by: Papers (2)
To solve problems such as target defocus, signal distortion caused by amplitude and phase error of the spaceborne wideband SAR system, the paper proposed a new method to estimate and compensate radar signal errors. Amplitude and phase error of the X-SAR system signal were analyzed in detail which include quadratic error,periodic error and random error. To acquire these errors, phase gradient algor...Show More
Improvements of ROPE in ISAR Motion compensation
2007 1st Asian and Pacific Conference on Synthetic Aperture Radar
Year: 2007 | Conference Paper |
Cited by: Papers (2)
Motion compensation in inverse synthetic aperture radar (ISAR) usually consists of two parts: range alignment and phase compensation. In this paper, the rank one phase estimation (ROPE) algorithm is applied to the ISAR phase compensation. Its blind setting of zero Doppler frequency at the start is avoided greatly by circular shifting the poorly focused strongest scatterer in each range bin to the ...Show More
Error Extraction and Compensation Method of Calibration Signal
Zhaoyang Zeng;Hui Wang;Yuxuan Bie;Lipeng Feng;Shichao Zheng;Ying Sun
2021 2nd China International SAR Symposium (CISS)
Year: 2021 | Conference Paper |
By broadcasting a linear frequency modulation signal (LFM) with a large temporal width and bandwidth, the airborne spaceborne synthetic aperture radar (SAR) achieves high resolution in the range. The chirp signal flowing across the transmitting and receiving links has certain amplitude and phase defects since the actual system is not a perfect system. The effect of pulse compression will be substa...Show More
A Wideband True-Time-Delay Phase Shifter with 100% Fractional Bandwidth Using 28 nm CMOS
2020 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)
Year: 2020 | Conference Paper |
Cited by: Papers (11)
A fully integrated passive true-time-delay (TTD) phase shifter is presented for a wideband phased array antenna using 28-nm CMOS technology. By using a delay-compensation technique, a linear phase characteristic is achieved within a wide frequency range over 8-24 GHz. A combined bridged-tee network (BTN) delay cell is proposed to accomplish the delay compensation with the most significant bit (MSB...Show More
Grating Phase Error Compensation Principle and System Design Based on FPGA
2024 4th International Conference on Energy, Power and Electrical Engineering (EPEE)
Year: 2024 | Conference Paper |
Grating measurement technology is a high-precision measurement technology based on counting the moire fringes formed by the grating. Based on the characteristics of grating sensor signals and signal segmentation technology,we proposes the principle of phase error compensation. The grating phase error compensation system with FPGA as the processing core is designed to make the two non orthogonal si...Show More
A 35-39 GHz CMOS Phase Shifter With Capacitive Compensation for Phased-Array Applications
2024 International Conference on Microwave and Millimeter Wave Technology (ICMMT)
Year: 2024 | Conference Paper |
This paper presents a 35-39 GHz 6-bit switched-type phase shifter (STPS) for Ka-band phased-array applications. The 5.625° phase shift unit utilizes a capacitive loading structure, the 11.25° and 22.5° phase shift units employ a low-pass Π-type configuration, while the 180° phase shift unit adopts a high-low pass switching structure. For the 45° and 90° phase shift units, a switch capacitor with p...Show More
Error compensation algorithm and performance evaluation for phase-shifting interferometer
Proceedings of 2011 International Conference on Electronic & Mechanical Engineering and Information Technology
Year: 2011 | Conference Paper |
Phase retrieval algorithms with a small number of grabbed buckets are very helpful to the phase-shifting interferometer (PSI) required real-time processing, so the algorithms within five buckets are very practical and are given more attention. In the paper, new 4 and 5-bucket algorithms are developed to compensate phase-shift deviation and detector nonlinearity. Numerical simulations and experimen...Show More
Phase Error Measurement and Compensation Technology for Demodulated Signals Based on Phase Synchronization Technology
2024 IEEE 4th International Conference on Data Science and Computer Application (ICDSCA)
Year: 2024 | Conference Paper |
Based on the phase synchronization, the phase error of demodulated signal is detected and compensated. At present, research on this issue mainly focuses on the low measurement accuracy of phase error and the poor compensation effect for phase error. To solve this problem, this article adopted a new phase synchronization algorithm. Firstly, a new phase synchronization method was adopted to improve ...Show More
An Open-Loop Synchronization Technique With Simple Structure for Phase Error Compensation and Frequency Estimation
The open-loop synchronization technique (OLST) features unconditional stability and fast dynamic performance. However, the estimated phase and amplitude errors occur in presence of the grid frequency drift. Moreover, the frequency prediction method recommended in literatures is complicated. To overcome these problems, this letter proposes a simple solution, which obtains the phase error by compari...Show More
Time-Modulated Array Using Phase Shifter for Amplitude-Phase Error Compensation
2019 IEEE International Symposium on Phased Array System & Technology (PAST)
Year: 2019 | Conference Paper |
Cited by: Papers (5)
A low side lobe level pattern in a phased array antenna is desired for the radar systems. Time-modulated array has been investigated to achieve ultra-low side lobe pattern. We have proposed a time-modulated array using only phase control. In this method, a desired pattern can be achieved in a time average procedure by temporally controlling of each element phase. However, performance degradation o...Show More
A Phase Error Compensation for Structured Light 3D Profile Measurement
2011 First International Workshop on Complexity and Data Mining
Year: 2011 | Conference Paper |
Cited by: Papers (1)
A structured light system composed of the digital devices and phase-shifting method is widely used for the accurate three-dimension profile measurement. However, the nonlinear gamma error and harmonics error of the digital devices, especially the projector, will cause the captured fringe patterns to be non-sinusoidal waveforms, which lead to an additional phase error and therefore measurement erro...Show More
Phase offset compensation methods and applications in beam codebook generation
2021 IEEE 93rd Vehicular Technology Conference (VTC2021-Spring)
Year: 2021 | Conference Paper |
Due to the short wavelength of mmWave channel in 5G, the size of antenna array becomes reduced and beamforming has been thus adopted in mobile handsets. To enable the beamforming, the phase shifter is necessary to control the phases from different antenna elements. However the phase shifter can have non-ideal phase and non-identical gain responses over the antenna elements and phase codes. To cons...Show More
An Effective Nonlinear Phase Compensation Method for FMCW Terahertz Radar
IEEE Photonics Technology Letters
Cited by: Papers (11)
The nonlinearity of signal usually leads to the range profile blurring and defocusing in the terahertz (THz) radar ranging, which should be compensated to achieve a well-focused range profile. In this letter, an effective nonlinear phase compensation method is proposed to compensate for the signal distortion caused by the radar waveform nonlinearities. It comprises two processing steps, namely, co...Show More
In recent mobile communication systems, impairments in analog circuits cannot be disregarded owing to the need to achieve high performance. Errors in analog circuits consist of a distortion of a power amplifier(PA), gain and phase imbalance in a quadrature modulator(QMOD) and a quadrature demodulator(QDEMOD), dc offset, frequency offset, and so on. Because of high accuracy of compensation, many te...Show More
This paper proposes an error compensation algorithm based on synchronous reference frame phase-locked loop for accurate phase estimation of the distorted three-phase voltages including asymmetrical phase voltages, harmonics, and dc offset. These errors cause undesirable periodic ripples with grid frequency in the traditional PLL and significantly degrade the overall performance of the grid-connect...Show More
High resolution dual channel receiving SAR compensation technique
2007 1st Asian and Pacific Conference on Synthetic Aperture Radar
Year: 2007 | Conference Paper |
Cited by: Papers (9)
This paper presents the theory of dual-channel receiving Synthetic Aperture Radar (SAR) and internal calibration. Using the data of an airborne high resolution SAR demonstrate System collected in May 2006, the internal calibration error and amplitude & phase errors are analyzed. The raw data is compensated by internal calibration data to improve range compression quality compared to auto-focus met...Show More
Correlation-Based Carrier Phase Estimation for WDM DP-QPSK Transmission
Kittipong Piyawanno;Maxim Kuschnerov;Fabian N. Hauske;Bernhard Spinnler;Ernst-Dieter Schmidt;Berthold Lankl
A novel algorithm for frequency offset compensation and carrier phase estimation in systems with 40 or 111 Gb/s coherent dual-polarization quadrature phase-shift keying (DP-QPSK) with on-off keying or DP-QPSK neighbors is demonstrated. The algorithm, which applies correlation phase adjustment embedded between digital differential demodulation and nonredundant error correction, leads to a significa...Show More
An Efficient Motion Error Compensation Method for Linear Array 3-D SAR Imaging
2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS
Year: 2021 | Conference Paper |
In order to overcome layover and shadowing effects, three-dimentional(3-D) synthetic aperture radar(SAR) systems have developed rapidly. One of them is linear array SAR(LASAR). Therefore, the image result may defocus due to the antenna phase centers(APCs) motion measurement error. Thus a novel LASAR motion compensation approach is proposed. Based on the analysis that linear array motion error is a...Show More
Beamforming Experiment of Time-Modulated Array Using Phase Shifter
2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)
Year: 2021 | Conference Paper |
Time-modulated array (TMA) has been investigated to achieve ultra-low side lobe pattern. We have proposed a time-modulated array using phase shifters. In this method, a desired pattern can be achieved in a time average procedure by temporally controlling of each element phase. It can be also used to compensate amplitude and phase excitation errors in phased arrays. In this paper, the effectiveness...Show More
Performance prediction of a phase synchronization link for bistatic SAR
Oscillator phase noise can dictate the performance of bistatic and multistatic synthetic aperture radar imaging. In this letter, the use of a dedicated synchronization link to quantify and compensate oscillator phase noise is investigated. Different synchronization schemes are presented, and their performance is analyzed. The error contribution of the synchronization link itself, which may suffer ...Show More
Phase Compensation Method Based on Reference-Element for SAA FMCW Radar
Switched antenna array (SAA) frequency modulated continuous wave (FMCW) radar is attracting critical attention due to its low-cost and straightforward architecture. However, the phase distortion problem limits its application in the direction estimation of moving targets. To address this problem, we propose a phase compensation method based on reference-element in this letter. First, we adopt a ne...Show More
Black-Box Phase Error Compensation for Digital Phase-Shifting Profilometry
Wei Zhang;Liandong Yu;Weishi Li;Haojie Xia;Huaxia Deng;Jin Zhang
Due to the nonlinear response of digital phase-shifting profilometry (PSP), phase errors are inevitable in the retrieved 3-D profiles and result in negative impacts on the measurement accuracy of the PSP system. A novel method is presented in this paper to reduce the impact. Instead of compensating phase errors in the retrieved 3-D profile, specific harmonics are superimposed upon the initial frin...Show More
A Dual-Band Vector-Sum Phase Shifter using I-Q Phase Compensation Technique for 5G Applications
2023 18th European Microwave Integrated Circuits Conference (EuMIC)
Year: 2023 | Conference Paper |
This paper investigates a dual-band vector-sum phase shifter operating at 5G millimeter-wave $(\mathrm{mmW})$ bands. It is implemented in a $22\mathrm{~nm}$ FD-SOI technology to prove the concept. The phase shifter core is composed of a poly-phase-filter (PPF) for differential quadrature signal generation and an amplitude control block for vector amplitude tuning. An advanced phase compensation te...Show More
Optronic High-Resolution SAR Processing With the Capability of Adaptive Phase Error Compensation
A system design of optronic high-resolution synthetic aperture radar (SAR) processing is proposed in this letter; it has the capability of adaptive phase error compensation. In our system design, SAR raw data are focused optically by phase correction in the two-dimensional frequency domain. The computations of SAR image formation are performed by spatial light modulators and lenses. With the propa...Show More
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