Cognitive minor lobe interference suppression method
A technology of interference suppression and side lobes, applied in the field of sonar radar, which can solve the problem that manual selection cannot adapt to rapid changes, etc.
Inactive Publication Date: 2016-07-20
HOHAI UNIV
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In practical applications, artificial selection cannot adapt to rapid changes in the actual environment
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[0115] The method of the present invention is verified by computer simulation. Assume a 16-element radar or sonar array is an equidistant linear array with half-wavelength between elements. There are two interference sources in the simulation space. Interference 1 is located at 30°, which is pulse interference with a duty cycle of 50%. Interference 2 is located at 45°, which is continuous wave noise frequency modulation interference. 16 elements form a beam pointing at 15°. The ratio of interference to noise is 60dB. For the time-domain modulus waveform of interference 1, see figure 2 shown. For the time-domain modulus waveform of interference 2, see image 3 shown. In order to compare the performance of the cognitive sidelobe interference cancellation algorithm proposed in the present invention, a traditional sidelobe cancellation algorithm is used for performance comparison. The traditional algorithm uses 4 auxiliary channels to suppress the interference of the beam o...
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The invention discloses a cognitive minor lobe interference suppression method. The method comprises the following steps of: (1) receiving signals through a radar or sonar isometric line array to form a digital wave beam, naming the digital wave beam as a main channel signal and extracting an array unit as an auxiliary channel signal; (2) performing envelope solving and envelope filtering on the main channel signal and judging whether an interference signal exists; (3) taking a plurality of auxiliary channels in the array unit as interference estimation channels, calculating characteristic roots of a covariance matrix and determining the interference amount; and (4) determining that the auxiliary channel number of interference self-adaptive suppression equals to the interference amount, adopting a sampling matrix inversion algorithm to perform self-adaptive weighting calculation with the auxiliary channel amount, and cancelling the interference in the main channel signal. According to the invention, the interference amount and the interference signal density in a period can be judged automatically so as to realize the interference self-adaptive suppression in a rapidly changed environment and the simplification of the self-adaptive interference suppression algorithm is realized through reducing the channel number in real time.
Description
technical field [0001] The invention relates to a method for suppressing cognitive sidelobe interference, which belongs to the technical field of sonar radar. Background technique [0002] In sonar, radar and other systems, it is often necessary to suppress the interference from the sidelobe to ensure the normal target detection of radar and sonar systems. In general radar and sonar systems, adaptive technologies such as adaptive zero point formation and adaptive sidelobe cancellation are used to suppress sidelobe continuous interference, while sidelobe concealment technology is often used to suppress sidelobe pulse interference. However, the form of sidelobe interference is changeable, and not all types of interference are suitable for suppression by sidelobe interference cancellation techniques such as adaptive nulling. The current interference suppression method for sidelobe adaptive zero point formation generally uses some sampling points for adaptive weight calculation...
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IPC IPC(8): G01S7/36G01S7/537
CPCG01S7/36G01S7/537
Inventor 王峰蒋德富
Owner HOHAI UNIV