Radar orthogonal waveform design method based on frequency modulation and phase modulation of chaotic sequence

A chaotic sequence and orthogonal waveform technology, applied in the field of radar transmit waveform design, can solve the problems of limiting the predictable probability of chaotic signals, low complexity of a single modulation waveform, etc., and achieve the effect of improving signal orthogonality and flat power spectrum

Inactive Publication Date: 2015-12-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The use of chaos in waveform design has produced many achievements in amplitude, frequency, and phase modulation alone, but the complexity of a single modulation waveform is low, and it limits the predictable probability of chaotic signals. The intercept probability (LIP) and anti-interference performance (ECCM) of radar )

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  • Radar orthogonal waveform design method based on frequency modulation and phase modulation of chaotic sequence
  • Radar orthogonal waveform design method based on frequency modulation and phase modulation of chaotic sequence
  • Radar orthogonal waveform design method based on frequency modulation and phase modulation of chaotic sequence

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Embodiment Construction

[0038] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0039] It is assumed that the MIMO radar system has M independent transmitting units, and each transmitting unit is composed of N sub-pulses, and the duration of the sub-pulses is T. The radar quadrature waveform design method based on the FM phase modulation of the chaotic sequence of the present invention comprises the following steps:

[0040] S1. Use the chaotic system to generate a chaotic sequence, the length of the chaotic sequence is N*P, and cut it into a sequence of P segments according to the way that each segment has a length of N, and select a segment of the sequence, so that it is {x(0) , x(1), x(2),..., x(N)}; the chaotic sequence in this embodiment adopts the more commonly used tent sequence, and its expression is:

[0041] x n+1 =1-(2-ε)|x n |

[0042] Where ε is a free factor and ε→0; the free fa...

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Abstract

The invention discloses a radar orthogonal waveform design method based on frequency modulation and phase modulation of a chaotic sequence, comprising the following steps: S1, using a chaotic system to generate a chaotic sequence of which the length is N*P, and cutting the chaotic sequence into P sequence sections (the length of each sequence section is N), selecting one sequence section, and letting the sequence section be {x(0), x(1), x(2),...,x(N)}; S2, encoding a chaotic joint frequency modulation and phase modulation signal, dividing a pulse into a series of equal sub pulses, and carrying out frequency modulation differently on different sub pulses, and then, using the sequence section obtained in S1 to carry out phase encoding on each cycle of a waveform in each frequency encoding sub pulse, and obtaining a phase-frequency joint modulation chaotic radar signal through use of a randomly-generated initial phase; and S3, calculating a complex envelope signal of the phase-frequency joint modulation chaotic radar signal obtained in S2. The signal frequency and phase change as a chaotic signal changes, the orthogonality of signals is improved, and the interception probability is reduced.

Description

technical field [0001] The invention belongs to the field of radar emission waveform design, and relates to a radar orthogonal waveform design method based on frequency modulation and phase modulation of chaotic sequences. Background technique [0002] Multiple-input multiple-output (MIMO) radar has been widely concerned by scholars at home and abroad because of its superior performance. To avoid crosstalk between waveforms, MIMO radars require the transmission of orthogonal waveforms. Based on this, orthogonal waveform design is one of the key technologies in MIMO radar research. The quadrature waveform design of MIMO radar is mainly divided into two types, one is the quadrature waveform design based on the optimization criterion; the other is the quadrature waveform design based on the modulation coding form. Orthogonal waveform design methods based on optimization criteria generally use optimization algorithms to solve waveforms that meet the optimization criteria, but ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/282
CPCG01S7/282
Inventor 林厚宏卢霞霞蒋思源檀鹏超
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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