Radar waveform amplitude and phase modulation method based on mixed sequences

A hybrid sequence and radar waveform technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of limiting the predictable probability of chaotic signals, poor performance, low waveform complexity, etc., and achieve the improvement and improvement of amplitude-phase joint modulation. Complexity, the effect of improving stealth

Inactive Publication Date: 2015-11-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The present invention is mainly aimed at problems such as low waveform complexity in the design of a single amplitude modulation or phase modulation waveform based on chaotic sequences, which limits the predictable probability of chaotic signals, radar intercept probability (LIP) and anti-jamming performance (ECCM), and the tent sequence The problem of the poor performance of the two sequences in the joint amplitude modulation and phase modulation of the logistic sequence and the logistic sequence

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  • Radar waveform amplitude and phase modulation method based on mixed sequences
  • Radar waveform amplitude and phase modulation method based on mixed sequences
  • Radar waveform amplitude and phase modulation method based on mixed sequences

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Embodiment Construction

[0021] The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] 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.

[0023] Step 1: First, use Tent mapping and Logistic mapping to generate two chaotic sequences of length N, and then mix them 1:1 to generate a sequence of length 2*N, and truncate it into a sequence of 2*N / P according to the length P. The more commonly used tent mapping expression is:

[0024] The chaotic sequence in the step 1 adopts the more commonly used tent mapping expression as:

[0025] x(n+1)=0.5-u|x(n)|,n=0,1,2...

[0026] x(0) is the initial value and x(0)∈[-0.5,0.5], x(n)∈[-0.5,0.5]; u is a free parameter, and u=2-ε,ε→0. The Logistic mapping expression is:

[0027] x(n+1)=u(0.25-x(n) 2 )-0.5,n=0,1,2...

[0028] x(0) is the initial val...

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Abstract

The invention discloses and relates to a radar waveform amplitude and phase modulation method based on mixed sequences and belongs to the field of radar transmitted waveform design. The method comprises steps of 1: obtaining to-be-modulated signals, judging periods requiring the signals, identifying numbers N of sub-pulse in one period where signals should be modulated, and mixing the tent sequence and the logistic sequence in proportion of 1:1 to obtain a mixed sequence with code length of N; using the mixed sequence in the step 2 to modulate phase positions of all pulse in the obtained periods; using the mixed sequence in the step 2 to modulate amplitude of the obtained modulated signals; and outputting modulation results. Combining advantages of amplitude modulation and phase modulation, signal amplitude and phase positions change along with chaotic signals, so complexity is increased and interception probability is reduced.

Description

technical field [0001] The invention belongs to the field of radar emission waveform design and relates to a method for amplitude modulation and phase modulation of radar waveforms. Background technique [0002] The waveform of the radar transmitting signal has an extremely important influence on the performance of the radar. The transmitting signal determines the system of the radar, the generation of the signal and the best processing method of the received signal. The complexity of the signal also ensures the low interception capability of the radar. In recent years, chaotic signals have sharp autocorrelation functions, pushpin-type fuzzy functions, and ultra-wideband, which just meet the requirements of the high accuracy of distance measurement and velocity measurement in modern radar systems; at the same time, the noise-like characteristics and initial value sensitivity of chaotic signals The signal parameters are not easy to be intercepted by the enemy's reconnaissanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/28G01S7/35G01S7/36
CPCG01S7/28G01S7/35G01S7/36
Inventor 周云卢霞霞赵延栋舒占军于雪莲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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