Scanning method for improving signal to noise ratio of target based on pulse team staggered arrangement

A technology of target signal-to-noise ratio and scanning method, applied in radio wave measurement systems, instruments, etc., can solve the problems of decreased target correlation, inconvenient for engineering implementation, and small RCS.

Active Publication Date: 2017-01-04
THE 724TH RES INST OF CHINA SHIPBUILDING IND
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AI Technical Summary

Problems solved by technology

[0012] Pulse frequency agility can achieve pulse-to-pulse decorrelation, but the correlation of targets also decreases after frequency agility
At the same time, frequency agility between pulses cannot complete other signal processing, such as pulse cancellation, MTI and MTD, etc.
After increasing the rotation speed of the antenna, the requirements for the stable platform of the servo system are higher, and the storage amount of data is required to be specific, which is not convenient for engineering realization
Low-altitude slow-moving weak targets on the sea usually have the characteristics of small RCS and strong correlation between echoes, and are easy to be lost in the background of sea clutter, and are difficult to be detected by radar systems

Method used

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  • Scanning method for improving signal to noise ratio of target based on pulse team staggered arrangement

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Embodiment Construction

[0018] The present invention proposes a scanning method based on the staggered arrangement of pulse groups to improve the target signal-to-noise ratio, and the implementation steps are as follows:

[0019] 1. Calculate the number of pulses that need to be accumulated according to the functional mission of the radar and the detection requirements of the target. At the same time, the number of beams of pulse groups transmitted on a wave position is determined.

[0020] 2. Determine the decorrelation time of sea clutter according to the working frequency band of the radar. For a medium-resolution radar, when it observes the sea surface at low grazing angles, the sea clutter decorrelation time is about 10 ms.

[0021] 3. In a scheduling interval, take out all the pulse groups in the interval.

[0022] 4. Interleave the pulses of the pulse group. The specific method is as follows: arrange all the pulse groups according to the azimuth-elevation angle, first arrange according to t...

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Abstract

The invention relates to a scanning method for improving the signal to noise ratio of a target based on pulse team staggered arrangement, and the method is mainly suitable for the detection of a target in sea clutter of a marine phased-array radar, and aims at solving a problem that the sea clutter of a shipborne marine phased-array radar immerses a low detectable slow fluctuating target. The method enables the pulse repetition period of the radar to be greater than the related time of sea clutter through the staggered arrangement of beams in a pulse team, achieves the target correlation and clutter decorrelation, and removes the correlation of sea clutter to maximum degree. The method can remarkably improve the signal to clutter ratio of an echo, and improves the detection of a low detectable target. The method is good in application prospect at the aspect of the detection of a sea-surface target.

Description

technical field [0001] The invention belongs to the detection technology of a phased array radar sea surface target, adopts the decorrelation of sea clutter based on pulse group interleaving technology, and realizes the detection of weak and small targets with slow undulations on the sea surface. Background technique [0002] Whether sea clutter can be effectively suppressed will seriously affect the ability to extract moving small targets in the background of strong sea clutter. The interference of clutter to radar has always been a serious problem. Whether the environmental clutter interference can be effectively controlled is the dominant factor for the performance of the radar system to be fully utilized. For shore-based or ship-based radars to detect sea or low-altitude targets, the influence of sea clutter must be overcome. [0003] The correlation of the detection target is manifested by the fluctuation characteristics of the target. Typical target fluctuations are d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S7/292
CPCG01S7/2928G01S7/414
Inventor 李纪三
Owner THE 724TH RES INST OF CHINA SHIPBUILDING IND
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