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OFDM frequency agile emission signal design method based on cyclic prefix

A Cyclic Prefix, Transmitting Signal Technology

Active Publication Date: 2020-12-11
XIDIAN UNIV
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Problems solved by technology

However, the simulation results show that the autocorrelation function of the non-constant modulus sequence designed by this method is low, and the side lobe is still high, and only the non-constant modulus sequence can complete the zeroing of the side lobe in a specific area

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  • OFDM frequency agile emission signal design method based on cyclic prefix
  • OFDM frequency agile emission signal design method based on cyclic prefix
  • OFDM frequency agile emission signal design method based on cyclic prefix

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Embodiment Construction

[0025] The embodiments and effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] The design of the transmitted signal has an important impact on the performance of the radar signal. At present, the waveform design of the OFDM signal is mainly to optimize the design of the transmitted sequence. By establishing a mathematical optimization model, the purpose of range sidelobe suppression is achieved. The design of the above-mentioned transmitting signal adopts the traditional design method, and the distance side lobe suppression has not achieved the expected effect.

[0027] Aiming at this current situation, the present invention conducts research and discussion, and proposes a cyclic prefix-based OFDM frequency-agile transmit signal design method.

[0028] see figure 1 , the implementation steps of the present invention include as follows:

[0029] Step 1, performing serial-to-parallel conversion on the OFDM ...

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Abstract

The invention provides an OFDM frequency agile emission signal design method based on a cyclic prefix. The problem of mutual crosstalk of echo energy between different distance resolution units in theprior art is mainly solved. According to the implementation scheme, the method comprises steps of performing serial-parallel conversion on an emitted signal data sequence, designing a sub-carrier frequency of random hopping, adding a cyclic prefix CP to the OFDM emission signal, constructing a sub-carrier emission signal according to the random hopping sub-carrier frequency, and modulating the sub-carrier signal by using a parallel data sequence to obtain a modulated sub-carrier signal, and superposing the modulated sub-carrier signals to obtain an OFDM frequency agile emission signal based on a cyclic prefix, thereby finishing the design of the emission signal. Simulation results show that when the frequency agility emission signal designed by the invention is adopted to carry out pulsecompression on the echo signal, the distance sidelobe of the radar can be reduced, and the interference of the distance sidelobe on a target can be effectively inhibited. The method can be applied toradar distance sidelobe suppression, radar weak target detection and radar imaging.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a design method for an orthogonal frequency division multiplexing OFDM frequency agility transmitting signal, which can be applied to radar range side lobe suppression, radar detection of weak targets and radar imaging. Background technique [0002] The range side lobe is the energy diffusion of the radar echo signal in the similar range resolution unit after matched filtering, which will cause the weak target to be covered by the stronger target side lobe, resulting in the loss of the target or the generation of false targets. The current OFDM signal design in radar only utilizes the flexibility of OFDM signal to optimize the design parameters. However, the cyclic prefix CP of OFDM in the communication system is not fully used in the radar system. In a communication system, adding CP to the OFDM transmission signal can realize sub-channel without intersymb...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02G01S7/36G01S7/282G01S7/28
CPCG01S7/023G01S7/36G01S7/282G01S7/2813Y02D30/70
Inventor 全英汇赵金珊张瑞邢孟道
Owner XIDIAN UNIV
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