Method for locating near-field targets based on linear programming and system thereof
A target positioning and linear programming technology, which is applied in the radio wave measurement system, sound wave re-radiation, and utilization of re-radiation, etc., can solve the problems of difficult target positioning in the near field, and achieve the goals of increasing work, reducing energy consumption, and improving utilization. Effect
Inactive Publication Date: 2012-08-15
INST OF ACOUSTICS CHINESE ACAD OF SCI
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[0009] In order to overcome the deficiencies of the prior art and solve the difficult problem of near-field target positioning in the prior art, the purpose of the present invention is to provide a near-field target positioning method and system based on linear programming
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Embodiment 1
[0099] Such as image 3 As shown, the specific steps of a linear programming-based near-field target positioning method for a linear array in this embodiment are as follows:
[0100] Step 401: Regular sampling:
[0101] In this step, a single line array is used to receive the space-time two-dimensional signal, the first array element is selected as the reference array element, and its working sampling frequency is F s , the array element signal is the reference target signal ζ rf (t), the number of sampling points is K.
[0102] Step 402: Compressed sampling:
[0103] In this step, obtain the sampling data β of all array elements except the reference array element i , the sampling frequency of these array elements is F cs , and the number of sampling points is M.
[0104] In the above step 401, when the form of the target signal is known, the sampling frequency of the first array element as the reference array element is also F cs .
[0105] Step 403: Obtain the array ...
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The invention provides a method based on linear programming for locating near-field targets and a system thereof, particularly a method for locating near-field targets on the basis of the compressive sensing theory. The method comprises the following steps: selecting a reference array element under the condition that the signal form is unknown, allowing the reference array element to work at the normal sampling frequency, and the other array elements to work at far below the Nyquist sampling frequency; taking the output signal of the reference array element as the reference target signal, to acquire the sample data of all the array elements; generating a time-delay table and a sparse basis array; generating a random mapping array and obtaining a coefficient array; obtaining a sparse vector by linear programming solution; and acquiring the location information of the near-field target from the predetermined location-distance collection on the basis of the acquired estimation results ofthe sparse vector. According to the invention, the sensor does not need to work beyond the Nyquist sampling frequency, thereby greatly reducing the sampling rate, reducing the operating energy consumption of the sensor and improving the resource utilization rate of the system; and the method has no limits to the target bandwidth, so that the method is applicable to the target location of both narrowband and wideband, and the method is further applicable to non-Gaussian target location.
Description
technical field [0001] The invention belongs to the field of array signal processing, in particular to a linear programming-based near-field target positioning method and system suitable for linear arrays. Background technique [0002] A basic problem in array signal processing is target positioning, that is, to determine the parameters such as azimuth and distance of the space signal of interest. Target positioning refers to the use of a certain algorithm to process the two-dimensional space-time signal radiated or reflected by the array, so as to obtain the estimation of parameters such as target azimuth and distance. Generally speaking, target location assumes that the target is in the far-field condition, and the signal emitted by the source reaches the array in the form of a plane wave. However, when the target is in the near-field, that is, the distance between the target and the array is R<2L 2 / λ, where L is the effective aperture of the array, λ is the wavelengt...
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IPC IPC(8): G01S15/06G01S15/08
Inventor 田彪李宇黄海宁
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI