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Target positioning method based on distance-pitching joint dictionary

A target positioning and distance technology, applied in the field of signal processing, can solve the problems of unguaranteed convergence speed and convergence, high signal-to-noise ratio requirements, unsuitable for large-scale application, etc.

Inactive Publication Date: 2021-07-06
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

It mainly uses magnetic anomaly technology for measurement, but its method requires high signal-to-noise ratio. For actual magnetic anomaly signals, its convergence speed and convergence cannot be guaranteed, so it is difficult to carry out practical applications and is not suitable for large-scale applications.

Method used

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  • Target positioning method based on distance-pitching joint dictionary
  • Target positioning method based on distance-pitching joint dictionary
  • Target positioning method based on distance-pitching joint dictionary

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specific Embodiment

[0053]1. Select 16 array elements as the receiving array, the array aperture is 1m, and the distance between the transmitting array elements and the midpoint of the receiving array is 10m; in the pitch dimension, the pitch angle ranges from -30° to 30°, and the step size is 1°; In the distance dimension, 50 atoms are used for each angle, and the relative delay between two adjacent atoms is 10 sample delay points, so the distance step is 10×c / f s =0.03m(c=1500m / s, f s =500kHz), the distance range is 10m~11.47m.

[0054] The signal is transmitted by the transmitting array element as the target echo in all directions.

[0055] 2. Establish a range-elevation joint dictionary with the signal data received by the receiving array, and express the received echo signal as a linear superposition of echoes received at different distances and elevations. The mth column of the range-pitch joint dictionary can be expressed as:

[0056]

[0057] Where m=(L×n)*(j-1)+k, 1≤j≤N, 1≤k≤L×n, 1...

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Abstract

The invention discloses a target positioning method based on a distance-pitching joint dictionary. The method comprises the steps of firstly, building different distance-pitching joint dictionaries for different environments through target echoes received by a receiving array, and then estimating the distance and pitching of the target by using a distance-pitching joint dictionary, obtaining sparse expression of echo signals by using a waveform dictionary, solving a sparse vector alpha containing the distance and pitching of the target by introducing an l1 norm minimization method in a convex optimization theory, and finally obtaining a target estimation result. Under different environment backgrounds, good target distance-pitching joint estimation can be realized, errors are small, operation is greatly simplified compared with an original method, and the defects of the original method are overcome.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a target positioning method. Background technique [0002] At present, the more traditional target parameter estimation methods include methods such as preformed beam orientation, split beam orientation, interpolation orientation, and multi-beam orientation. The principle of the traditional target parameter estimation method is to measure the sound path difference or phase difference between the array elements when the target signal arrives at the base array, and then perform parameter estimation on the basis of the measurement results. The theoretical research and practical application of this kind of method are relatively mature, but there are still many deficiencies in itself, such as the obvious decrease in estimation accuracy under harsh conditions, high precision requirements for measuring equipment, poor fault tolerance, and the error depends on envir...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 杨长生梁红庞硕
Owner NORTHWESTERN POLYTECHNICAL UNIV
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