A Target Detection Method for High Frequency Marine Radar Based on Compact Antenna Array
A radar target and detection method technology, applied in the radar field, can solve the problems of increasing the difficulty of target detection, high-frequency marine radar without target detection method, and low target signal-to-noise, so as to avoid shadowing effect, enhance signal-to-noise ratio and signal-to-noise ratio. The effect of clutter ratio and high-efficiency detection
Active Publication Date: 2019-04-12
南京欢涛仪器有限公司
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Problems solved by technology
The former antenna system itself has directivity, its pattern is "8" shape, and the beam width is very wide, so the signal in the obtained RD diagram comes from multiple directions, the Doppler broadening of sea clutter is obvious, and the target point More, the target signal-to-noise ratio is small, which increases the difficulty of target detection
Currently, there are no effective target detection methods for high-frequency marine radars with compact antenna arrays
Method used
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[0030] Describe in detail below in conjunction with accompanying drawing and embodiment:
[0031] like figure 1As shown, in this method, the receiving antenna of the high-frequency marine radar is a compact antenna array composed of two identical monopole crossed loop antennas. Two sets of coherent radar echo signals can be received at the same time. The two monopole crossed loop antennas must be the same, that is, it must be ensured that the two antennas have the same directivity and gain, and the radar echo signals received by the two antennas have the same noise level. The distance is half the radar operating wavelength. Antenna 1 and Antenna 2 each include three channels, wherein channel 1 and channel 4 represent corresponding monopole channels, and channels 2 and 5 and channels 3 and 6 represent corresponding cross-loop channels.
[0032] like Image 6 As shown, the target detection method includes the following steps:
[0033] Step 1. Take the same time period t i ...
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The invention discloses a high-frequency ocean radar target detection method based on a compact antenna array. A receiving antenna of a high-frequency ocean radar is an compact antenna array which consists of two identical monopole cross looped antennas. In the same time period, two groups of coherent radar echoes can be received. The radar echoes respectively comprise a target, sea clutter, zero frequency clutter and noise. The method can achieve the high-efficiency detection and extraction of a target through three steps: sequentially carrying out the PCA and extraction, wavelet filtering and adaptive threshold detection of the two groups of radar echoes. The method is advantageous in that the method can greatly improve the SNR (signal to noise ratio) and SCR (signal to clutter ratio) of the target; the method can achieve the better inhibition of the continuous clutter, such as the sea clutter and zero frequency clutter; and the method has better detection performances in a multi-target occasion.
Description
technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a compact antenna array for receiving radar echoes of sea surface, ships and low-altitude targets, and a method for radar signal enhancement, clutter suppression and target detection, in particular to a method based on compact A high-frequency marine radar target detection method for antenna arrays. Background technique [0002] High-frequency marine radar can not only achieve all-weather, large-area, over-the-horizon monitoring of the ocean surface environment, but also detect surface ships and low-altitude targets. [0003] Due to the large number of traditional phased antenna array antennas, large footprint, and high construction and maintenance costs, the miniaturized and compact antenna array composed of monopole / cross-loop antennas has been obtained due to its advantages of small size, easy installation and maintenance, etc. more and more attention. It is mainly...
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IPC IPC(8): G01S7/285G01S7/41
CPCG01S7/285G01S7/41
Inventor 文必洋卢博
Owner 南京欢涛仪器有限公司