Blind Direction of Angle and Time Delay Estimation Algorithm for Uniform Linear Array Employing Multi-Invariance Music

Zhang, Xiaofei; Feng, Gaopeng; Xu, Dengfeng

doi:10.2528/pierl09102611

Cited by 26 publications

(20 citation statements)

References 10 publications

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“…Robust oblique projector-based TDE, this is the result after 3000 iterations. whose result can be investigated by beamforming [33]. Assume that the antennas are spaced by half a wavelength, the beamforming is shown in Figure 4.…”

Section: Results Analysis Of the Proposed Methodsmentioning

confidence: 99%

Improved Blind Source Extraction for Time Delay Estimate in Passive Coherent Location System

Zhang

Wang²,

Li³

et al. 2012

PIER B

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Abstract-Target localization is one challenge in passive coherent location (PCL) radar system, and the time delay is the most important parameter in the location. The difficulty of time delay estimate (TDE) in PCL system is that the target signal is completely buried in direct path signal, multipath and clutter (DMC). The conventional clutter cancellation algorithms in matched filter (MF) are time consuming. In this paper, we propose a time delay estimate method based on blind source extraction (BSE) which directly extract the target signal from the mixed signals, thus a new passive coherent location system is built. In this model, the reference antenna is not needed any more. For low signal to interference plus noise ratio (SINR) and frequency overlapped signals in passive coherent location, we introduce the cyclostationarity to enhance the target signal. The experiments on FM broadcast signals show that the computational burden of the proposed algorithm is extremely small and the improved SNR satisfies the location requirements of PCL system.

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Section: Results Analysis Of the Proposed Methodsmentioning

confidence: 99%

Improved Blind Source Extraction for Time Delay Estimate in Passive Coherent Location System

Zhang

Wang²,

Li³

et al. 2012

PIER B

View full text Add to dashboard Cite

show abstract

“…Since phased array technology uses multiple antenna cells and electronic time delays to create beams that can be scanned and focused electronically for multiple angle inspections [6], the receive antenna array of OSMAR2009 is based on eight wide band helical antenna cells with 2 rows, and the first of which is a linear array combined by six cells for array signal processing while the second is combined by the other two antenna cells for array calibrating.…”

Section: Osmar2009 Radar Systemmentioning

confidence: 99%

Remote Sensing With TDMF Radar: Some Preliminary Results

Yan

Wu²,

Chen³

2010

PIER Letters

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Abstract-HF radar in ocean remote sensing makes use of electromagnetic waves of 10 m to 100 m wavelength from the rough sea surface to measure surface current and ocean wave parameter. Recently, a new time division multiple frequency HF radar system called OSMAR2009 has been developed by the Wuhan University. One main advantage of the system is that it is of great help in extracting current parameters and significant wave height. A further advantage is the ability to avoid interference. In addition, this technique offers the opportunity to measure the current shear. These advantages are gained by transmitting time division multiple frequency chirp instead of one frequency chirp. This paper introduces the technical design and the advantage of OSMAR2009 and describes the remote sensing experiment implemented in East China Sea during 2009, followed by the field results and the brief analysis of such results.

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“…Thus, high-resolution frequency domain estimation methods, such as MUSIC, ESPRIT, and the linear prediction, have been proposed by some scholars to estimate the time delay. However, a satisfactory estimation of the multi-path time delay is obtained only for signals with flat or almost flat spectra [5,6]. In addition, the maximum likelihood estimation and the least-squares algorithm are used to estimate the time delay [7], but their processes involve more complex multidimensional optimization.…”

Section: Introductionmentioning

confidence: 99%

Statistical Characteristics of the Multi-Path Time Delay and Doppler Shift of a Radar Wave Propagating Through the Ionosphere

Ma¹,

Guo²,

Su³

2013

PIER

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Abstract-Multi-path time delay spread is a very important factor in the bit error rate of high-frequency ionospheric communication channels and in the target detection performance of over-the-horizon radars. In this study, the probability density distribution of multi-path time delay and Doppler shift of ionospheric radio signal are derived using Rayleigh fading. Moreover, the probability density distribution of time delay, average power of the received signal, and received signal variance are discussed in detail. Using a designed experimental circuit, the measured value of the multi-path time delay spread is obtained from three given radio paths by the sweep-frequency pulse sounding technique. The average value of the multi-path time delay spread that changes with the ratio K, which is the operating frequency of the basic maximum usable frequency, is also analyzed and fitted using the least-squares fitting method. Theoretical and statistical research shows that for a given radio path and specific frequency, the multi-path time delay spread approximately follows a normal distribution. The average time delay spread decreases with the increase in the ratio K; however, it eventually approaches a steady value. The results of this research provide an empirical reference for further prediction and estimation of the time delay spread of a radar wave propagating through the ionosphere.

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Blind Direction of Angle and Time Delay Estimation Algorithm for Uniform Linear Array Employing Multi-Invariance Music

Cited by 26 publications

References 10 publications

Improved Blind Source Extraction for Time Delay Estimate in Passive Coherent Location System

Improved Blind Source Extraction for Time Delay Estimate in Passive Coherent Location System

Remote Sensing With TDMF Radar: Some Preliminary Results

Statistical Characteristics of the Multi-Path Time Delay and Doppler Shift of a Radar Wave Propagating Through the Ionosphere

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