Low-probability-of-intercept transmitted signal design method based on FDA-OFDM

A technology for transmitting signals and low interception, applied in the field of signal processing, which can solve problems such as inconspicuousness, complexity, and lack of flexibility in beam patterns, and achieve low interception performance and simple implementation methods

Active Publication Date: 2019-07-09
XIDIAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] "Cognitive MIMO frequency diverse array radar with high LPI performance" published by L.Huang et al. in 2016 proposed a low-intercept frequency diversity array radar using the frequency diversity array distance dependence. This method is mainly based on the frequency diversity array distance dependence Realize the low interception performance of the transmitted signal, but this method involves the decoupling of the distance angle, which is more complicated
[0007] In some of the above studies, the low interception effect of the transmitted signal formed is not obvious; some methods require decoupling, which is more complicated; some methods lack flexibility in the beam pattern
In conclusion, there is no ideal design method for frequency diversity array low-intercept transmit waveform in the prior art

Method used

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  • Low-probability-of-intercept transmitted signal design method based on FDA-OFDM
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  • Low-probability-of-intercept transmitted signal design method based on FDA-OFDM

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Embodiment 1

[0032] The waveform design of the transmitted signal has an important impact on the performance of the radar signal. At present, the waveform design of the frequency diversity array mainly includes, for the single-carrier transmitted signal, the transmitted signal is mainly changed by changing the frequency increment Δf, mainly using logarithm, exponential, trigonometric functions, etc. The mathematical function changes the frequency increment; for the multi-carrier transmission signal, the transmission signal mainly adopts changing the frequency increment Δf, mainly uses various mathematical function superposition to change the frequency increment, or adopts the combination of frequency diversity array and phased array method to design the emission signal. For the waveform design of the above-mentioned transmitted signal, the single-carrier transmitted signal has the disadvantages of insufficient freedom and high side lobes; the multi-carrier transmitted signal has relatively ...

Embodiment 2

[0051] The low-interception transmit signal waveform design method based on FDA-OFDM is the same as embodiment 1, wherein the frequencies of the two orthogonal signals transmitted by the mth array element of the frequency diversity array in step (1) are respectively:

[0052]

[0053] where f 0 Indicates the carrier frequency of the reference antenna, Δf 0 and Δf 1 Different carrier frequency increments are introduced between different array elements.

[0054] In the prior art, the frequency increment of the transmitted signal is mainly used to design the waveform of the frequency diversity array. The method of transmitting the signal is relatively complicated and cannot directly match the filtered echo. The present invention adopts the design of orthogonal waveforms for the transmission signals of the frequency diversity array, and uses two orthogonal sub-carriers in each array element to realize the mutual orthogonality between the transmission signals, and directly ado...

Embodiment 3

[0056] The design method of low-interception emission signal waveform based on FDA-OFDM is the same as embodiment 1-2, wherein in step (2) is a quadrature phase encoded signal, where for the signal phase. The present invention adds a Signals make the transmit signals on each frequency diversity array have orthogonality, and realize the waveform design of the orthogonal signals of the frequency diversity array.

[0057] A more detailed example is given below, and the present invention and its effects are further described in detail in conjunction with the accompanying drawings and embodiments.

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Abstract

The invention discloses a low-probability-of-intercept transmitted signal waveform design method based on FDA-OFDM. The invention solves the technical problem that a frequency diversity array transmitted signal is easy to intercept and interfere. The low-probability-of-intercept transmitted signal waveform design method comprises an implementation method of: constructing an array model of a frequency diversity array; designing an orthogonal transmitted signal; constructing an array oriented matrix A; defining a weighting moderate matrix W; and by the array oriented matrix A and the weighting moderate matrix W together, obtaining a frequency diversity array beam energy diagram so as to complete low-probability-of-intercept transmitted signal waveform design based on FDA-OFDM. According to the invention, the transmitted signal adopts orthogonal waveform design; each array element uses two orthogonal subcarriers; a transmitted signal beam pattern is changed from conventionality, complexity is improved, and the transmitted signal beam pattern is a result of overlaying two transmitted signals at an assumed target position. According to the invention, the probability of intercepting andidentifying the transmitted signals is reduced, interference resistance is promoted, and the low-probability-of-intercept transmitted signal waveform design method is beneficial for implementing low-probability-of-intercept performance of the signals. The low-probability-of-intercept transmitted signal waveform design method can be applied to a frequency diversity array MIMO radar, inhibition on distance correlation interference and spuriousness and low-probability-of-intercept electronic detection.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to radar transmission signals, in particular to a design method for low-interception transmission signals based on FDA-OFDM, which can be applied to frequency diversity array MIMO radars to suppress distance-correlation interference and strays, and low Intercept electronic reconnaissance. Background technique [0002] The phased array antenna is composed of multiple antenna units, and each antenna is equipped with a phase shifter, which is used to change the phase relationship of the signals between the antenna units and realize electronic beam scanning. Phased arrays are widely used in radar target detection and radar imaging. However, the traditional phased array uses the same transmission frequency, and the beam is only related to the angle, but has nothing to do with the distance, and only angle estimation can be performed in target positioning. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02G01S7/282
CPCG01S7/02G01S7/282
Inventor 全英汇张瑞赵金珊邢孟道李亚超朱圣棋刘智星陈侠达高霞董淑仙
Owner XIDIAN UNIV
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