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High-resolution distance image obtaining method

A high-resolution range image and acquisition method technology, which is applied in the field of high-resolution range image acquisition, can solve the problems that unknown target characteristics cannot be realized, the model needs to achieve fixed order, and the performance cannot be achieved, and the effect of good application prospects can be achieved.

Inactive Publication Date: 2015-12-09
HOHAI UNIV
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Problems solved by technology

[0003] The current super-resolution technology of the distance dimension generally adopts the MUSIC method, the Prony method, etc. The disadvantage of these methods is that the use of the model needs to achieve order determination.
Order determination is to determine the order of the model, which cannot be achieved for unknown target characteristics
However, traditional pulse compression or Dechirp techniques often fail to achieve ideal performance due to limited resolution

Method used

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Embodiment Construction

[0034] The present invention will be described in further detail in conjunction with the accompanying drawings and specific embodiments.

[0035] The principle block diagram of the present invention using linear frequency modulation continuous wave transmission signal, combined with Dechirp transform and Capon technology to realize the distance dimension and high resolution one-dimensional range image is as follows figure 1 shown.

[0036] The method mainly includes the following steps:

[0037] (1) Transmit FM continuous wave signal

[0038] The radar transmits a chirped continuous wave signal s(t), which has the following form:

[0039] s(t)=exp{j(2πf 0 t+0.5μt 2 )}(1)

[0040] Among them, f 0 is the carrier frequency, t is the time variable, μ is the ratio of the bandwidth to the pulse width, exp{j( )} is a complex representation, and the modulation period of the FM continuous wave is T.

[0041] (2) Receive the echo signal

[0042] y (...

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Abstract

The invention discloses a high-resolution distance image obtaining method. Aiming at a frequency modulated continuous wave radar, the method employs the Dechirp technology to achieve the transformation of the received frequency modulated continuous wave to a frequency domain, and employs a Capon method to achieve the recognition of target scattered points in distance, thereby obtaining the high-resolution HRRP of a target. The method can be used for forming a radar high-resolution one-dimensional distance image, and is good in application prospect because the introduced Capon method does not need order determination in advance.

Description

technical field [0001] The invention relates to a method for acquiring a high-resolution range image, which belongs to the technical field of radar. Background technique [0002] Radar generally uses pulse compression technology to achieve high-precision resolution in distance, thereby obtaining a high-resolution one-dimensional range profile (HRRP). A signal with a large time width and bandwidth product can take into account both energy and distance resolution. How to further improve the resolution on the range is of great significance for the use of one-dimensional range image for target recognition. When the design bandwidth of the system is constant, the higher the resolution, the more target features can be extracted from the one-dimensional range image. For object recognition, more features means better recognition effect. [0003] The current distance dimension super-resolution technology generally adopts MUSIC method, Prony method, etc. The disadvantage of these m...

Claims

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Application Information

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IPC IPC(8): G01S13/89
CPCG01S13/89
Inventor 王峰蒋德富
Owner HOHAI UNIV
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