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Method for detecting floating targets on sea based on normalized Doppler spectrum

A technology of Doppler spectrum and target detection, which is applied in the direction of measuring devices, radio wave measurement systems, radio wave reflection/reradiation, etc. It is difficult to apply the detection method that can solve the fractal characteristics, and the radar cannot perform long-term detection Observation and other issues

Inactive Publication Date: 2014-10-01
XIDIAN UNIV
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Problems solved by technology

In practical applications, radar is usually unable to observe for a long time, so the detection method based on fractal features is difficult to apply in practice

Method used

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  • Method for detecting floating targets on sea based on normalized Doppler spectrum
  • Method for detecting floating targets on sea based on normalized Doppler spectrum
  • Method for detecting floating targets on sea based on normalized Doppler spectrum

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Embodiment Construction

[0040] refer to figure 1 , illustrate a kind of sea surface floating object detection method based on normalized Doppler spectrum of the present invention, concrete implementation steps are as follows:

[0041] Step 1. The radar transmitter transmits continuous pulse signals, and the radar receiver receives multi-pulse target signals. After matching and filtering the multi-pulse target signals, the radar echo data X along the distance dimension and pulse dimension are obtained continuously. For the radar The echo data X is divided into blocks, that is, divided into B blocks along the pulse dimension, and the echo data of block B (X 1 ,...,X b ,...,X B ), b=1,2,...,B.

[0042] Radar echo data X is expressed as a M×L two-dimensional matrix, M means that it contains M distance units, L means it contains L pulses, and the radar echo data X is evenly divided into blocks B according to the number of pulses L, and B is greater than 1 It is an integer smaller than L, and the speci...

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Abstract

The invention discloses a method for detecting floating targets on the sea based on a normalized Doppler spectrum, and relates to the field of radar target detection. The method includes the steps that firstly, radar echo data are divided into blocks, and divided echo data are acquired; secondly, the normalized Doppler spectrum is calculated for the echo data of a unit to be detected; thirdly, the detection statistical amount is constructed according to the normalized Doppler spectrum; fourthly, a false alarm probability is given, and a detection threshold is acquired through a Monte Carlo experiment; fifthly, whether the targets exist or not is judged according to the detection statistical amount and the detection threshold, if the detection statistical amount is larger than the detection threshold, it is judged that the targets exist, or else it is judged that the targets do not exist. The method mainly solves the problems that in the prior art, detection performance is low when radar observation time is short. The method is adaptive, suitable for different sea states and space-time changes, and capable of effectively detecting the floating targets under the seat clutter background.

Description

technical field [0001] The invention belongs to the technical field of target detection, and in particular relates to a method for detecting floating targets on the sea surface based on normalized Doppler spectrum, which is used for detecting floating targets on the sea surface. Background technique [0002] The sea clutter is defined as the signal received by the radar and reflected back from the sea surface. When the sea surface search radar detects the target, it is often affected by the sea clutter. The intensity of sea clutter will vary with the radar parameters, radar irradiation direction, sea conditions, air humidity, etc. In the background of strong sea clutter, it is difficult to detect floating targets such as buoys, ice floes, boats, and floating objects on the sea surface through traditional energy accumulation methods. For the detection of floating targets on the sea surface, the commonly used method is to conduct high-resolution observations in the space and ...

Claims

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Application Information

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IPC IPC(8): G01S13/50
CPCG01S7/2927G01S7/414G01S13/50
Inventor 水鹏朗许述文马晓礼李东宸
Owner XIDIAN UNIV
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