An Improved Constant False Alarm Detection Method for Shipborne LFM CW Radar
A technology of constant false alarm detection and linear frequency modulation, which is applied in the field of signal processing, can solve the problems of complex mean calculation, and the robust algorithm is not suitable for low-cost implementation, and achieves the effect of avoiding the shadowing effect.
Active Publication Date: 2016-08-31
WUHAN ZHONGYUAN ELECTRONICS GRP
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, these algorithms are at the cost of increasing the amount of calculation. For example, OS-CFAR needs to perform sorting statistics, which is much more complicated than the mean calculation of CA-CFAR.
So robust algorithms such as OS-CFAR are not suitable for low-cost implementation
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0068] In the following, the technical solutions of the present invention will be further described in detail through embodiments and in conjunction with the drawings.
[0069] An improved method for detecting constant false alarms of shipborne linear frequency continuous wave radar, including the following steps:
[0070] Step 1. Set the constant false alarm probability P expected by the constant false alarm detection method of the shipborne chirp continuous wave radar A .
[0071] Step 2: Store the maximum value of the energy of each Doppler channel after Doppler processing of the echoes received by the radar receiver from the different distance bins on the echo scan line into a two-dimensional data matrix, such as image 3 Shown. A two-dimensional data matrix has two dimensions: distance and azimuth. The row direction of the two-dimensional data matrix is called the distance of the matrix, and the column direction of the two-dimensional data matrix is called the azimuth of the...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses an improved constant false alarm rate detecting method for a ship-borne linear frequency modulation continuous wave radar and belongs to the field of signal processing. The method includes: the maximum value of each Doppler channel energy after Doppler treatment of each distance unit is used as the input of a two-dimensional reference window; judgment is performed twice, targets and backgrounds are preliminarily distinguished through the first judgment, and before the second judgment, the units judged as the targets by the first judgment are removed during energy average value calculation of the distance units. Compared with traditional CA_CFAR, the method has the advantages that the defect of mutual shielding of adjacent targets is overcome, the advantage of low calculation complexity of the traditional CA_CFAR is kept, and both detection performance and software-hardware implementation cost are considered.
Description
Technical field [0001] The method belongs to the field of signal processing, and particularly relates to a constant false alarm detection method. technical background [0002] The clutter intensity of real radar varies with time, distance, and azimuth. The use of a fixed threshold will result in a high missed detection rate or false alarm rate; modern radars often use constant false alarm detectors, so that the detection threshold varies with background noise, clutter and interference Adjust adaptively to ensure a constant false alarm rate. The key to the design of the constant false alarm rate detector is the adaptive adjustment method of the detection threshold. [0003] The commonly used CA (Cell Average)-CFAR constant false alarm detection algorithm is to sum the energy of the cell near the detected cell (referred to as the reference cell) and divide it by the number of reference cells to estimate the average value of clutter and noise energy Z , And then multiply by a consta...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
CPCG01S7/414
Inventor 张东华任学锋龚涛李宁
Owner WUHAN ZHONGYUAN ELECTRONICS GRP