Direct sequence spread spectrum signal interception detection method

A technology of direct spread signal and detection method, which is applied in the field of direct spread signal interception and detection, and can solve the problems of slow propagation speed, decreased gain, and difficult implementation

Active Publication Date: 2016-09-21
SOUTHEAST UNIV
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The correlation accumulation method makes use of the autocorrelation characteristics of the direct spread signal pseudo code, but in order to obtain high gain, multi-segment data autocorrelation estimation is required for cumulative averaging. In the underwater acoustic field, the pro

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Direct sequence spread spectrum signal interception detection method
  • Direct sequence spread spectrum signal interception detection method
  • Direct sequence spread spectrum signal interception detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The simulation signal parameters are: sampling frequency f s =50KHz, carrier frequency f 0 =5.0kHz, the order of the pseudocode is 5, the two-phase modulation method is adopted, the number of carrier cycles in one chip is 8, then the chip time width is 1.6ms, the number of discrete sampling points is 80 points, and the signal amplitude is A 0 = 1, superimposed zero-mean Gaussian white noise, variance σ 2 The size of is determined by the signal-to-noise ratio SNR:

[0051] In order to verify the detection performance of the method of the present invention, the Monte Carlo method is used to simulate the detection performance of the unsigned code and the direct spread signal with the signal code respectively. Each simulation is performed 1000 times, and the detection probabilities under different false alarm probability requirements are counted. figure 2 and image 3 The interception and detection performance curves of DS signals without information codes and with in...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a direct sequence spread spectrum signal interception detection method. The method comprises the steps of 1, obtaining a data sequence x (n); 2, obtaining a self-correlation sequence r (m); 3, smoothing the r (m); 4, setting a search step j; 5, estimating an accumulation amount C (j); 6, searching the maximum value C (jmax) of the accumulation amount C (j); and 7, carrying out detection judgment and pseudo code cycle estimation. According to the detection method provided by the invention, the direct sequence spread spectrum signal interception detection can be realized only by use of the one-time self-correlation estimation result; through accumulation of correlation peaks of the self-correlation sequence and step variable search, the processing gain is improved; the influence of information codes is reduced; the detection performance is improved; the process is simple; and the prior information is unnecessary.

Description

technical field [0001] The invention belongs to the technical field of communication and signal processing, and relates to a method for interception and detection of direct spread signals, which is used for interception and detection of direct spread signals under non-cooperative conditions. Background technique [0002] Direct sequence spread spectrum (hereinafter referred to as direct spread) technology has been widely used in the field of underwater acoustic communication and detection. Because its energy is dispersed in a wide frequency band and the energy per unit frequency is low, the interception and detection method under non-cooperative conditions has become a communication method. Research hotspots and difficulties in countering underwater acoustics. Existing detection methods for DS signal interception mainly include: energy detection method, square law method, correlation accumulation method, and period spectrum-based method. The traditional energy detection met...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04B1/707
CPCH04B1/707
Inventor 王晓燕李帝水姚帅其他发明人请求不公开姓名
Owner SOUTHEAST UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap