Signal Processing for FMCW SAR

Meta, Adriano; Hoogeboom, P.; Ligthart, L.P.

doi:10.1109/tgrs.2007.906140

Cited by 357 publications

(209 citation statements)

References 17 publications

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“…The range profiles were obtained by analyzing the spectrum property of the IF signal which is obtained by mixing the signal sampled with the oscillograph with an ideal LFMCW signal with zero time delay (aligned with the LFMCW trigger signal) generated in MATLAB software [18]. The x-axis is translated from frequency to distance since the frequency of the IF signal is proportional to the object distance [1].…”

Section: Hybrid Pre-distortion Approachmentioning

confidence: 99%

“…Compared with pulse radars that require high peak transmission power, LFMCW systems which operate with constant low transmission power normally take lower cost and smaller size [1]. On the other hand, the peak power reduction simplifies the transmitter design while increases both performance and reliability since it reduces the risk of breakdown or arcing in the high power cables [2].…”

Section: Introductionmentioning

confidence: 99%

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Study of hybrid pre-distortion compensation approach for radar transmitter in Ku-band with high frequency modulation rate—modeling and experiment

Zheng

Chen

et al. 2015

IEICE Electron. Express

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Pre-distortion approach is used in frequency synthesizers to compensate the statistical phase errors in the synthesized signal. However, as the systems becoming more and more complex, it is hard to describe the phase errors for a complex system with one single model. In this paper, a hybrid pre-distortion approach was proposed for a transmitter composed of different modules with high frequency modulation rate. Models for different modules are combined to form the hybrid distortion model. Based on the proposed model and the convenience of the Direct Digital Waveform Synthesis (DDWS) technology employed in the transmitter, the distortion of a complex system can be feasibly compensated. Experimental studies were performed with reduced phase errors and improved range profiles achieved, which verify the effectiveness of the proposed approach.

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Section: Hybrid Pre-distortion Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of hybrid pre-distortion compensation approach for radar transmitter in Ku-band with high frequency modulation rate—modeling and experiment

Zheng

Chen

et al. 2015

IEICE Electron. Express

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“…In the last decade, high-performance, compact, low-cost customized synthetic aperture radar (SAR) systems have been developed and equipped successfully on unmanned aerial vehicles (UAV) for remote sensing applications [1,2]. On the other hand, there is also commercial short range radar available for micro air vehicles (MAV) as an altimeter [3] or for proximity warning [4].…”

Section: Introductionmentioning

confidence: 99%

Micro-Air-Vehicle-Borne Near-Range Sar With Motion Compensation

Wu¹,

Zwick²

2014

PIER

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Abstract-The major difficulty of realizing a micro-air-vehicle-borne (MAV-borne) synthetic aperture radar (SAR) is the motion errors that need to be precisely measured and compensated. This paper presents two novel motion measuring algorithms specifically for near-range applications. These algorithms use only low-cost micro-electronic-mechanical system (MEMS) inertial measurement units (IMU). A MAV-borne SAR system was built equipped with a commercial off-the-shelf (COTS) motion sensing board. Several MAV-borne SAR measurements were performed for the first time in a hall with a realistic scene. SAR images were generated with proposed motion measuring algorithms in off-line mode. Obvious improvements in SAR image quality in terms of focusing have been observed after motion compensation with the proposed motion measuring algorithms. These results show that MAV-borne SAR together with low-cost IMU can yield very useful images.

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“…A system based on a FMCW transceiver continuously transmits a chirp signal and uses deramp processing of the received waveform which encodes the range information in the beat signal's frequency. An essential problem of this type of transceiver is that the voltage controlled oscillator (VCO) adds a certain degree of nonlinearity which leads to a deteriorated resolution by spreading the target energy through different frequencies [3]. This problem is usually solved either by hardware [4], [5], [6] or software [7], [8], [9] approaches.…”

Section: Introductionmentioning

confidence: 99%

FMCW transceiver wideband sweep nonlinearity software correction

Anghel¹,

Vasile

Cacoveanu

et al. 2013

2013 IEEE Radar Conference (RadarCon13)

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Abstract-This paper presents a novel wideband sweep nonlinearity software correction method for a frequency modulated continuous wave (FMCW) transceiver based on the high-order ambiguity function (HAF) and time resampling. By emphasizing the polynomial-phase nature of the FMCW signal, it is shown that the HAF processing algorithm is well suited for estimating the sweep nonlinearity coefficients. The estimated coefficients are used to build a correction function which is applied by resampling the beat signal on each sweep interval. The sweep nonlinearity correction procedure is validated on real data acquired with a low-cost X-band T/R module.

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Signal Processing for FMCW SAR

Cited by 357 publications

References 17 publications

Study of hybrid pre-distortion compensation approach for radar transmitter in Ku-band with high frequency modulation rate—modeling and experiment

Study of hybrid pre-distortion compensation approach for radar transmitter in Ku-band with high frequency modulation rate—modeling and experiment

Micro-Air-Vehicle-Borne Near-Range Sar With Motion Compensation

FMCW transceiver wideband sweep nonlinearity software correction

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