Evaporation Duct Retrieval Using Changes in Radar Sea Clutter Power Versus Receiving Height

Zhang, Jinpeng; Wu, Zhensen; Zhang, Yusheng; Wang, Bo

doi:10.2528/pier11121307

Cited by 19 publications

(13 citation statements)

References 34 publications

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“…During the experiment, the sea surface evaporation waveguide is used as the long-distance channel [16][17][18]. It is a special channel formed by seawater evaporation at a very low altitude on the sea.…”

Section: Experiments and Their Results Analysismentioning

confidence: 99%

A Synchronous Wideband Frequency-Domain Method for Long-Distance Channel Measurement

Hu¹,

Zhou²,

Guo³

2013

PIER

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Abstract-This paper proposes a novel synchronous wideband frequency domain method for measuring time domain response of longdistance channel. Its core consists of: (1) baseband signal generators at the transmission terminal and the reception terminal respectively are used to generate the wideband signal of the same frequency; (2) the two GPS clock frequency reference sources locked on the same satellite are used to yield the high-stability 10 MHz signal as the external reference source of the baseband signal generator so that the initial phases of the wideband signals are basically the same; (3) the pulse per second (PPS) signal generated by the GPS clock frequency reference source is used as trigger signal to ensure that the baseband signal generator and the vector network analyzer (VNA) can transmit and receive signals synchronously; (4) the time domain response of the channel is indirectly obtained through the inverse Fourier transform of amplitude and phase of the frequency domain response. To verify the measurement method, experiments were performed, in which the sea surface evaporation waveguide which is tens of kilometers apart from each other was selected as the channel. The experimental results, given in Figs. 4 and 5, and their analysis show that the measurement method can obtain amplitude and phase of the signal whose band is hundreds of MHz and whose equivalent pulse width reaches 5 ns. The measurement method is used to obtain the time domain response of the long-distance channel, verifying that the measurement method is effective.

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Section: Experiments and Their Results Analysismentioning

confidence: 99%

A Synchronous Wideband Frequency-Domain Method for Long-Distance Channel Measurement

Hu¹,

Zhou²,

Guo³

2013

PIER

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“…It is difficult to get analytical solutions according to current theories, and optimization methods are used to get approximate solutions. In the last decade, many advances have been made in RFC techniques (Rogers et al 2000(Rogers et al , 2005Gerstoft et al 2003aGerstoft et al ,b, 2004Kraut et al 2004;Yardim et al 2006Yardim et al , 2007Yardim et al , 2008Yardim et al , 2009Vasudevan et al 2007;Douvenot et al 2008Douvenot et al , 2010Wang et al 2009;Zhang et al 2011Zhang et al , 2012Karimian et al 2012). Most of these works used the split-step Fourier parabolic equation (PE) method as the forward propagation model to construct the replica clutter returns.…”

Section: Introductionmentioning

confidence: 97%

Atmospheric Duct Estimation Using Radar Sea Clutter Returns by the Adjoint Method with Regularization Technique

Zhao

Huang

2014

Journal of Atmospheric and Oceanic Technology

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This paper focuses on retrieving the atmospheric duct structure from radar sea clutter returns by the adjoint approach with the regularization technique. The adjoint is derived from the split-step Fourier parabolic equation method, and the regularization term is constructed by the background refractivity field. To ensure successful implementations of the regularization, the L-curve criterion is used to find the optimal regularization parameter. The feasibility of the proposed method is validated by the numerical simulations of different noise-level clutter returns, as well as a real clutter profile measured by the S-Band Space Range Radar located in Wallops Island. In the process of inversions, the refractivity profile is first obtained by genetic algorithm, and then it is used as the background field for the adjoint method. The retrieved results indicate that, with an appropriate regularization parameter, the structure of the background refractivity profile can be improved by the proposed method.

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“…The sea clutter is assumed to be much greater than the receiver thermal noise, thus thermal noise can be ignored [31,32]. Meanwhile, the clutter is assumed to be Gaussian distributed with zero-mean, and independent from range cell to range cell.…”

Section: Performance Assessmentmentioning

confidence: 99%

Range Alignment and Motion Compensation for Missile-Borne Frequency Stepped Chirp Radar

Liu¹,

Chang²

2013

PIER

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Abstract-One of the difficulties for frequency stepped chirp radar (FSCR) is to resolve the range-Doppler coupling due to relative motion between the radar and the target. Motion compensation is usually adopted to solve the problem in realizing synthetic high range resolution profile (HRRP) for a moving target. For missileborne FSCR, the range migration of target echo during a coherent processing interval, which is resulted from the high speed motion of missile, is serious and will affect target detection and synthetic high range resolution profile. Therefore, range migration correction and motion compensation are very important for missile-borne FSCR signal processing. In the paper, with the background of terminal guidance anti-ship FSCR seeker, the range alignment is accomplished in frequency domain during the process of real-time digital pulse compression. Then an effective velocity estimation algorithm based on the waveform entropy of the Doppler amplitude spectrum of target echoes is addressed and the velocity estimation accuracy is derived. Finally, the simulation indicates that the new method can estimate the radial velocity accurately and reconstruct the distorted HRRP successfully. In addition, the method has good anti-noise performance and works in the scenario of multi-target with different velocities as well.

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Evaporation Duct Retrieval Using Changes in Radar Sea Clutter Power Versus Receiving Height

Cited by 19 publications

References 34 publications

A Synchronous Wideband Frequency-Domain Method for Long-Distance Channel Measurement

A Synchronous Wideband Frequency-Domain Method for Long-Distance Channel Measurement

Atmospheric Duct Estimation Using Radar Sea Clutter Returns by the Adjoint Method with Regularization Technique

Range Alignment and Motion Compensation for Missile-Borne Frequency Stepped Chirp Radar

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