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Method for measuring synthetic aperture sonar motion error and underwater acoustic channel phase error

A synthetic aperture sonar, motion error technology, applied in measurement devices, re-radiation of sound waves, radio wave measurement systems, etc., can solve problems such as increasing the complexity of equipment

Inactive Publication Date: 2006-07-26
NAVAL UNIV OF ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] additional transmit arrays for synthetic aperture imaging also add to the complexity of the device

Method used

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  • Method for measuring synthetic aperture sonar motion error and underwater acoustic channel phase error
  • Method for measuring synthetic aperture sonar motion error and underwater acoustic channel phase error
  • Method for measuring synthetic aperture sonar motion error and underwater acoustic channel phase error

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: see figure 2 , The sonar array of this embodiment is composed of 2 transmitting array elements and 8 receiving array elements, and the transmitting array elements fixedly send orthogonal signals of the same frequency in different pulse periods. In the previous pulse period, the transmitting element sends out the same frequency and orthogonal signal T 1 (k,t) and T 2 (k, t), after being reflected by the target, the echo signal received by the receiving element is S i，1 (k,t) and S i，2 (k, t), after pulse compression, the signal is S comi，1 (k,t) and S comi，2 (k, t). The two groups of target reflected echoes drawn in the figure have 16 phase centers respectively, that is, the midpoint position of the line connecting the 8 receiving array elements and the two transmitting array elements is received. When the next pulse period arrives, the two transmitting array elements respectively transmit signal waveform T 1 (k+1,t) and T 2 (k+1, t), due to the mov...

Embodiment 2

[0041] Example 2: see image 3 , the transmitting array elements in this embodiment send co-frequency quadrature signals in turn in different pulse periods. In the previous pulse period, the transmitting element sends out the same frequency and orthogonal signal T 1 (k,t) and T 2 (k, t), after being reflected by the target, the receiving element receives the echo signal S i，1 (k,t) and S i，2 (k, t). The two groups of target reflection echoes drawn in the figure are respectively received by 16 phase centers. In the next pulse, the two emission arrays emit T respectively 2 (k+1,t) and T 1 (k+1, t), due to the movement of the sonar carrier, the phase centers 1-8 have reached the positions of the phase centers 9-16 in the previous cycle, and the receiving array element receives the echo signal S in this cycle i，2 (k+1,t) and S i，1 (k+1, t). due to S i，2 (k,t) and S i，2 (k+1, t) is the echo signal received by the overlapping phase center, and they are echoes of the same ...

Embodiment 3

[0042] Embodiment 3: see Figure 4 , The sonar array in this embodiment is composed of 9 array elements, 3 of which are both transmitting array elements and receiving array elements, and 6 array elements can only work in the receiving state. The transmitting array element sends orthogonal signals of the same frequency arbitrarily in different pulse periods. In the previous pulse period, the transmitting element sends out the same frequency and orthogonal signal T 1 (k, t), T 2 (k,t) and T 3 (k, t), after being reflected by the target, the receiving element receives the echo signal S i，1 (k, t), S i，2 (k,t) and S i，3 (k, t), after pulse compression, the signal is S comi，1 (k, t), S comi，2 (k,t) and S comi，3 (k, t). The figure shows that the reflected echoes of the target are received by the 17 phase centers respectively. In the next pulse, the three emission arrays will emit T respectively. e1 (k+1, t), T e2 (k+1,t) and T e3 (k+1, t), (e1≠e2≠e3 and e1, e2, e3∈{1, 2...

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Abstract

The invention relates to method for measuring synthetic aperture sonar movement error and underwater sound channel error. The invention employs an irradiation matrix which is arranged along platform trace and different phase center to irradiate plural orthogonal signal with same frequency at the same time.

Description

technical field [0001] The invention belongs to the field of synthetic aperture sonar signal processing, and mainly relates to a measurement method for synthetic aperture sonar motion error and underwater acoustic channel phase error. Background technique [0002] Synthetic aperture sonar requires the platform to move in a straight line at a constant speed and the underwater acoustic channel has no phase error, but in fact there will always be a motion error on the platform, and there will also be a phase error on the underwater acoustic channel, both of which seriously affect the clarity of imaging. Therefore, the synthetic aperture sonar system must perform motion compensation and channel compensation. The first method of motion compensation is to use a motion sensor to measure the motion error and perform motion compensation for the motion error in signal processing. This method requires a high-precision motion sensor, which is relatively expensive, and cannot compensate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52G01S15/89
CPCG01S15/8904G01S7/52004
Inventor 唐劲松岳军陈鸣邹志农杨海亮
Owner NAVAL UNIV OF ENG PLA
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