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Radar imaging method based on phase encoding orthogonal frequency division multiplexing (OFDM) signals

A phase encoding and signal multiplexing technology, which is applied in the field of radar systems, can solve the problems of pulse repetition time, high distance sidelobe, low intercept probability, etc.

Inactive Publication Date: 2015-04-29
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

Using this signal for imaging radar can obtain a low probability of interception, and at the same time have superior performance in anti-jamming, anti-fading, suppressing multipath and clutter interference, etc., but when the radar transmits a burst signal, the pulse repetition time Higher distance sidelobes exist at

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  • Radar imaging method based on phase encoding orthogonal frequency division multiplexing (OFDM) signals
  • Radar imaging method based on phase encoding orthogonal frequency division multiplexing (OFDM) signals
  • Radar imaging method based on phase encoding orthogonal frequency division multiplexing (OFDM) signals

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Embodiment Construction

[0078] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0079] figure 1 It is a process for generating a complementary phase-encoded OFDM pulse pair signal. Among them, the complementary coding matrix is ​​obtained from the original phase coding matrix through the adaptive clone selection algorithm, and there is a time delay between the complementary signal and the initial signal, and the delay time is the pulse repetition period T r .

[0080] Such as figure 2 Shown is the flow chart of the adaptive clone selection algorithm. The problem is set as an antigen, and its solution is set as an antibody. The fitness function is used to measure the quality of the solution, and the solution with the maximum function value is sought. Proceed as follows:

[0081] (1) Set the algorithm parameters and initialize the antibody population. (2) Fitness function calculation and sorting. (3) Adaptive clone r...

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Abstract

The invention belongs to the field of radar systems and particularly relates to a novel radar imaging method based on phase encoding orthogonal frequency division multiplexing (OFDM) signals. According to the specific technical scheme, a radar transmitting terminal transmits complementary phase encoding OFDM signal pulse pairs, a radar receiving terminal conducts pulse compression and overlaying on two pulse echoes, a one-dimensional range profile of a target is obtained, and signals complementary to the original phase encoding OFDM signals are worked out by means of a self-adaptive clone selection algorithm. The algorithm takes original phase encoding matrixes as antigens and complementary phase encoding matrixes as antibodies, and the optimal antibody with the maximum fitness function is sought as a solution through the superiority-inferiority degree of a fitness function measurement solution. The distance sidelobe of the phase encoding OFDM signals at the pulse repetition time is lowered, so that the resolution of radar imaging is improved, the intercept probability of radar signals is lowered, and anti-interference, anti-fading, multipath suppression, clutter interference and other properties are improved.

Description

technical field [0001] The invention belongs to the field of radar systems for imaging, and in particular relates to a radar imaging method based on phase-coded orthogonal frequency division multiplexing signals. Background technique [0002] Radar imaging technology was developed in the 1950s, and it is a milestone in the history of radar development. Using radar imaging technology, images of targets and scenes can be obtained, and further tracking and identification of unknown targets can be achieved, which is of great significance for the victory of future electronic warfare. At the same time, because radar has the characteristics of all-weather, long-distance and wide observation zone, radar imaging technology has been widely valued. [0003] The radar system actively transmits electromagnetic wave signals through the radar antenna, and receives the echo signals scattered back to the radar antenna, and compresses the received echo signals into narrow pulses through matc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/89
CPCG01S13/89
Inventor 霍凯姜卫东刘永祥赵晶晶黎湘高勋章
Owner NAT UNIV OF DEFENSE TECH
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