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Radar pulse repetition interval modulation recognition method based on multi-feature extraction

A technology of radar pulse and repetition interval, which is applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, and measurement devices, etc., which can solve the problems of low recognition accuracy of PRI modulation methods of radar radiation sources, and few identifiable PRI modulation methods. , to achieve the effect of strong practical application value, high accuracy and good robustness

Active Publication Date: 2018-03-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that there are few identifiable PRI modulation modes and the low identification accuracy rate of radar radiation source PRI modulation modes in the existing radar radiation source identification method

Method used

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  • Radar pulse repetition interval modulation recognition method based on multi-feature extraction
  • Radar pulse repetition interval modulation recognition method based on multi-feature extraction
  • Radar pulse repetition interval modulation recognition method based on multi-feature extraction

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specific Embodiment approach 1

[0031] Specific embodiment one: in conjunction with Fig. 1 and figure 2 To describe this embodiment,

[0032] The radar pulse repetition interval modulation identification method based on multi-feature extraction is characterized in that comprising the following steps:

[0033] Step 1: Measure the time of arrival TOA of the radar signal, perform a differential process on the time of arrival TOA sequence, and obtain the PRI sequence p(n) of the radar signal, n=0,1,2...N-1, where n is The serial number of the PRI, N is the length of the PRI sequence; PRI is the radar pulse repetition interval;

[0034] Step 2: According to the characteristics of the six modulation modes of the radar signal, including conventional PRI, staggered PRI, jitter PRI, slipping PRI, sinusoidal PRI and dwell and switch PRI, design the feature quantity for recognition:

[0035] The first characteristic quantity R 1 is the fundamental harmonic amplitude ratio;

[0036] The second characteristic quanti...

specific Embodiment approach 2

[0043] Specific implementation mode two: combination figure 2 To describe this embodiment,

[0044] The specific identification steps of Step 3 described in this embodiment are as follows:

[0045] Step 1: Press the PRI sequence of the radar signal obtained in step 1 to Make a judgment, where r 1 for R 1 Corresponding threshold value; when the result is 1, it is judged to be a sinusoidal PRI; otherwise it is judged to be an unidentified PRI sequence, and identification is continued;

[0046] Step 2: Press the unrecognized PRI sequence in step 1 Make a judgment, where r 21 and r 22 Respectively R 2 Corresponding threshold value; when the result is 1, it is judged to be a jitter PRI; otherwise it is judged to be an unidentified PRI sequence, and the identification is continued;

[0047]Step 3: Perform median filter processing with 3 points on the unrecognized PRI sequence in step 2, then perform pulse loss detection and compensation processing, and then press Make a...

specific Embodiment approach 3

[0053] The specific steps of pulse loss detection and compensation processing described in step 3 described in this embodiment are as follows:

[0054] The PRI value higher than 1.5 times of the average PRI is regarded as the wrong PRI value generated by the missing pulse, and the previous PRI value is taken as the correction value.

[0055] Other steps and parameters are the same as in the second embodiment.

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Abstract

The invention discloses a radar pulse recurrence interval modulation recognition method based on multi-characteristic extraction relating to the radar radiation source recognition technology field. The object of the invention is to solve the problems of the conventional radar radiation source recognition methods such as less recognizable PRI modulation ways and low recognition accuracy of the radar radiation source PRI modulation ways. According to the routine PRI modulation way, the stagger PRI modulation way, the jittered PRI modulation way, the slide PRI modulation way, the sine PRI modulation way, and the resident and switching PRI modulation way, seven characteristic quantities can be defined in a targeted manner. By comparing the relation between the characteristic quantities and the corresponding thresholds, the recognition processing method based on the multi-characteristic quantities can be established, and the recognition of the six PRI modulation ways or the output of the unknown modulation ways can be realized. The method provided by the invention can be used for the recognition of the radar pulse recurrence interval modulation ways.

Description

technical field [0001] The invention relates to the technical field of radar radiation source identification. Background technique [0002] Radiation source identification is an important part of electronic reconnaissance. The identification of radiation source modulation characteristics, parameter ranges, and working performance plays an important role in the field of modern electronic countermeasures. The receiving system is faced with a very wide electromagnetic spectrum, a large number of complex system radars have emerged, and electronic countermeasures technology has been continuously updated, making the signal environment deteriorating day by day. The change of the working parameters of the radiation source, the loss of the pulse, the distortion of the signal, the pollution of the noise, the aliasing of the interference source, etc., increase the uncertainty of the signal. The emerging comprehensive applications of low signal interception probability technology, intr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/02G01S13/88
CPCG01S7/02G01S13/88
Inventor 荆薇李宏博刘晓磊白杨
Owner HARBIN INST OF TECH
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