SAS frequency domain processing method based on trunking processor

A frequency domain signal and processor technology, which is applied in the field of SAS frequency domain signal processing based on cluster processors, and can solve problems such as the inability to meet the requirements of real-time system time.

Active Publication Date: 2013-09-11
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

The direct transplantation of the ωk algorithm on the cluster processor usually cannot meet the time requirements of the real-time system

Method used

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  • SAS frequency domain processing method based on trunking processor
  • SAS frequency domain processing method based on trunking processor
  • SAS frequency domain processing method based on trunking processor

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Embodiment Construction

[0061] The system and method for SAS frequency domain signal processing based on cluster processors of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0062] Such as figure 2 As shown, the system consists of sub-tasks such as initialization, pulse compression, azimuth non-uniform discrete Fourier transform, STOLT interpolation, two-dimensional inverse Fourier transform, image data storage and forwarding, etc. Concrete implementation steps of the present invention are as follows:

[0063] 1) Set the operating parameters of the SAS real-time signal processing system, such as center frequency, signal bandwidth, pulse width, pulse repetition period, sampling frequency, transmitting array aperture, receiving array aperture, number of array elements, and number of sampling points.

[0064] After setup, receive raw echo data from the network.

[0065] Let the emission signal be p m (t)=exp(j(2πf 0 t+Kπt 2 )), the intensit...

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Abstract

The invention provides an SAS frequency domain signal processing method based on trunking processor. The method adopts parallel technology, multithreading technology and FFTW algorithm, thus omegak algorithm to be transplanted into SAS system and omegak algorithm can be carried out on a trunking processor. The method includes the following steps that: (1) parameter list of SAR system is set; (2) distance direction pulse compression is carried out; (3) azimuth direction non-uniform separate fast Fourier transformation NSFFT is carried out; (4) distance direction and azimuth direction phase compensation and STOLT transformation are carried out; (5) two dimension Fourier inverse transformation is carried out; wherein separate expression of the NSFFT method in the step (3) is showed in the specification. The invention is based on trunking processor and has high cost performance and stability and reliability; OpenMP technology is utilized to realize parallelization, operating rate is high, and operating efficiency is high; and FFTW technology is utilized to realize fast Fourier transformation, operating rate is high, and operating efficiency is high.

Description

technical field [0001] This system relates to the field of sonar signal processing. In particular, it relates to a SAS frequency domain signal processing method based on a cluster processor. Background technique [0002] Synthetic Aperture Sonar (SAS) is an advanced high-resolution underwater acoustic imaging sonar. The nano-echoes are coherently processed to obtain high resolution in azimuth. [0003] Synthetic aperture sonar imaging algorithms can be divided into two categories: time-domain algorithms and frequency-domain algorithms. The time-domain algorithm is mainly implemented through interpolation, indexing and complex superposition, and its advantages are: flexible use, small memory footprint, and easy implementation. Its disadvantage is that the calculation efficiency is low and the sampling rate is high. The frequency domain algorithm is mainly realized by Fourier transform and complex multiplication operation. Its advantage is high computational efficiency. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/52G01S7/539G01S15/89
CPCG01S15/8904
Inventor 江泽林刘维刘纪元张春华
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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