本翻译符合专业要求，请明鉴，不过赏分有点少了。
Spatial Compressive Sensing Approach For Field Directionality Estimation
用于场方向性估计的空间压缩传感方法
I. INTRODUCTION
1. 引言
Diverse techniques for field directionality estimation have been studied in the literature [1]-[5]. Consequently, a theoretical analysis of the relationship between the hydrophone array output and the noise field was conducted in [1]-[5].
The developed techniques were based on the array beamformer output or the cross-spectral matrix between outputs of array elements [4]-[5]. The problem of field directionality estimation in the ocean using a horizontal line-towed array was also addressed in the literature [5]-[8].
Recently, direction of arrival and field directionality estimation for moving sensor arrays have garnered renewed interest [9]-[12]. It has been shown that array motion can enhance array performance assuming temporal coherence of successive samples [10]-[11].
In [12], a wavefield sampling method that leverages the linear relationship between the noise field and the collection of beamformer outputs over various array orientations was proposed. It was demonstrated that the wavefield sampling (WS) method outperforms other tested methods. This algorithm was implemented via the recursive estimation method, and its convergence to the unique solution was guaranteed for a specific set of array orientations and beamformer look directions.
However, the selection of an appropriate array orientation and beamformer look direction sequence remains an open question.
The quality of field directionality estimation is determined by the angular resolution. The higher the angular resolution, the more accurate the estimation of far-field sources, and the better the detection performance.
A fundamental relationship in array signal processing is that angular resolution is directly proportional to the number of array elements [13]. This relationship motivates the desire for longer arrays that can achieve higher resolution. Unfortunately, this requirement conflicts with the implementation and installation limitations that favor shorter arrays.
Moreover, the implementation of longer arrays for maneuvering platforms such as unmanned underwater vehicles (UUVs) can be impractical [14].
These contradictions drive the search for alternative array signal processing methods. Typically, field directionality is modeled as a finite set of strong far-field narrow-band sources and an isotropic low-power noise [1].
In this work, the model of field directionality is adopted as follows. First, the bearing angle space is uniformly sampled into a large number of discrete angles. Next, it is assumed that either high energy corresponding to the far-field strong sources or low energy corresponding to the isotropic noise is received at the sensor array from each of these discrete azimuth angles.

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