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Time Series Packet Filtering and Amplitude Difference Gradual Approximation Method for Direction Finding

A time-series, gradual approximation technology, applied in radio wave measurement systems, measurement devices, radio wave reflection/re-radiation, etc. Effect

Active Publication Date: 2017-08-29
南京长江电子信息产业集团有限公司
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Problems solved by technology

Even so, the accuracy of these algorithms is still limited by the width of the CPI, and the azimuth resolution of target detection is not satisfactory

Method used

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  • Time Series Packet Filtering and Amplitude Difference Gradual Approximation Method for Direction Finding
  • Time Series Packet Filtering and Amplitude Difference Gradual Approximation Method for Direction Finding
  • Time Series Packet Filtering and Amplitude Difference Gradual Approximation Method for Direction Finding

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Embodiment Construction

[0022] Embodiments of the present invention will be further described in detail below in conjunction with examples and accompanying drawings.

[0023] The invention provides a direction finding method based on time series grouping filtering and amplitude difference progressive approximation strategy, including:

[0024] Step 1, long and short pulse grouping: according to the radar range, group the long and short pulses in each CPI to form multiple different pulse groups, and different pulse groups use filters of different orders; figure 1 as shown, figure 1 Midpulse group 1 is a short pulse sequence with a firing frequency of F1; pulse group 2 is a sequence of short and long pulse intervals, a short pulse firing frequency of F2, and a long pulse firing frequency of F1; pulse group 3 is a long pulse sequence with a firing frequency of F2. Among them, the short pulse is used to make up the blindness in the near area, and the frequency change is used to improve the detection pro...

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Abstract

The invention discloses a direction finding method based on time sequence packet filtering and amplitude difference gradual approximation, which comprises four steps of grouping of long and short pulses, selection of filter coefficients, determination of a pulse group of the current target and determination of a target direction. According to the direction finding method based on the time sequence packet filtering and amplitude difference gradual approximation strategy, on the basis of the prior art, a single pulse group inside a CPI is subjected to regrouping filtering processing to reduce width restrictions on the CPI, the target detection direction resolution can be improved, and the detection target direction precision can be improved.

Description

technical field [0001] The invention relates to a radar target direction finding method, in particular to a time series grouping filter and amplitude difference gradually approaching direction finding method. Background technique [0002] Most radars based on CPI (Coherent Processing Interval) processing mode use MTD (Moving Target Detection) processing, but because the target azimuth accuracy of MTD processing is limited by the width of CPI, the azimuth resolution of target detection is relatively low. For this reason, the filtered results of two adjacent pulse groups in the CPI are usually used to improve the azimuth accuracy of the detected target through the interpolation method, the center of mass method or the antenna beam correlation method. Even so, the accuracy of these algorithms is still limited by the width of the CPI, and the azimuth resolution of target detection is not satisfactory. Contents of the invention [0003] In order to solve the above problems, th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/06
CPCG01S13/06
Inventor 耿昭谦杨辉李旭明丁智青张绘
Owner 南京长江电子信息产业集团有限公司
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