Radar Signal Processing Method Based on Environmental Information
A radar signal processing and environmental information technology, applied in the field of radar, can solve the problems of limitation, clutter airspace non-uniformity, complex surrounding environment of radar, etc., and achieve the effect of avoiding performance degradation
Active Publication Date: 2014-10-01
XIDIAN UNIV
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Problems solved by technology
In addition, traditional detection methods use the same processing method for detection units in different environments.
However, the surrounding environment of the radar is generally very complex, resulting in the non-uniformity of the clutter airspace, and even the clutter in some areas is a mixture of various clutter
On the one hand, the non-uniformity of clutter severely limits the number of reference units that can be used for clutter covariance matrix and background power level estimation; The mismatch between the method and its environment, resulting in the decline of the detection performance of traditional detection methods
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[0028] refer to figure 2 , the specific implementation steps of the present invention are as follows:
[0029] Step 1, estimate the clutter covariance matrix.
[0030] Since the environment in which the radar is located is generally quite complex, the echo signals of different detection units present different distributions, which is the so-called clutter non-uniformity, so the inter-frame samples should be fully utilized when estimating the clutter covariance matrix. Reduce the impact of clutter non-uniformity on estimation accuracy;
[0031] make x m Represents the echo data of an azimuth-distance unit in the mth frame of the radar, where 1≤m≤m 0 , m 0 Indicates the current frame number, then the clutter covariance matrix of the mth frame
[0032] R ^ m = Σ n ≤ m β m ...
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The invention discloses a radar signal processing method based on environmental information. The radar signal processing method mainly solves the problem of poor detecting performance in a complex clutter background in the prior art. The radar signal processing method comprises the following steps: estimating a clutter covariance matrix according to interframe samples of a radar; calculating the clutter power spectrum of the current frame according to the estimated clutter covariance matrix; dividing the current frame into a clutter-free noise area, a ground clutter area, a meteorological clutter area and a mixed clutter area according to the clutter power spectrum of the current frame; and respectively conducting four types of corresponding processing to return signals according to the detecting area where a detecting unit is located. According to the radar signal processing method based on the environmental information, external environment information is fully utilized, matching signal processing modes are adopted in different detecting areas, and therefore the detecting performance of the radar is improved. In addition, the radar signal processing method based on the environmental information can be used for radar target detection in a complex clutter background.
Description
technical field [0001] The invention belongs to the technical field of radar, relates to target detection, and can be used for efficient processing of radar detection based on environmental information in complex clutter backgrounds. technical background [0002] Compared with other battlefield reconnaissance equipment, battlefield surveillance radar has the advantages of all-weather, long detection distance and wide surveillance range, so it has become a widely used battlefield reconnaissance equipment. However, in practical applications, the surrounding environment of the battlefield surveillance radar is quite complex, resulting in the presence of slow-moving meteorological clutter in addition to the powerful ground clutter in the echo data. Here comes the great challenge. [0003] The signal processing flow of the traditional adaptive detection method is as follows: figure 1 Shown: first do pulse pressure processing on the received signal of the radar, then do clutter ...
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IPC IPC(8): G01S7/41
Inventor 刘宏伟方明戴奉周赵永波纠博
Owner XIDIAN UNIV