Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A Broadband Chirp Ranging Method Based on Fractional Fourier Transform

A technology of linear frequency modulation pulse and ranging method, which is applied in the field of high-resolution ranging, and can solve the problem of losing modulation information and so on

Inactive Publication Date: 2011-12-14
邓兵
View PDF3 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the echo signal after linear frequency modulation pulse compression is only a narrow pulse envelope reflecting the time delay information, and the modulation information is lost.

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
  • A Broadband Chirp Ranging Method Based on Fractional Fourier Transform
  • A Broadband Chirp Ranging Method Based on Fractional Fourier Transform
  • A Broadband Chirp Ranging Method Based on Fractional Fourier Transform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] The present invention will be described in detail below with reference to the drawings and embodiments:

[0035] The overall flow of the broadband chirp ranging method based on fractional Fourier transform of the present invention is as follows image 3 As shown, including the following steps:

[0036] 1. Determine pulse repetition period Q, chirp pulse duration T, and frequency modulation μ.

[0037] Let’s set the speed of light to 3×10 8 M / s, based on the maximum detection distance Z max = 2×10 5 Meters, minimum detection distance Z min =1.5×10 3 Meter, distance resolution ρ = 15 meters, to determine the pulse repetition period Q, chirp pulse time width T, frequency modulation μ respectively: Q = 1.3333 × 10 -3 Second, T=1×10 -5 Second, μ=1×10 12 Hz / sec.

[0038] 2. Determine the baseband sampling frequency f k And segment processing time Q d .

[0039] First determine the baseband sampling frequency f k =5μT=5×10 7 Hertz, then take M, then 0d ≤84, therefore, U d = 10, which...

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 relates to the electronics and communication engineering field, and concretely relates to a method for realizing high resolution range finding by utilizing linearity frequency modulation pulse. The method comprises the following steps: (1) according to a system requirement, determining a pulse repetition period, a linearity frequency modulation pulse time width and a frequency; (2) determining a baseband signal sampling frequency and a segment processing time length; (3) sending a broadband linearity frequency modulation pulse signal, down converting an echo signal, sampling theecho signal, receiving a target echo, and carrying out a pre-filtering treatment; (4) carrying out a segment treatment on the echo signal, and carrying out threshold detection and distance estimationon each segment signal in an optimized fractional order Fourier transformation domain. According to the invention, on the premise of ensuring appropriate linearity frequency modulation pulse frequency domain compressibility, computational load is reduced by about half, amplitude and phase information of the echo signal are reserved, and connection with other signal processing links are facilitated.

Description

Technical field [0001] The invention relates to the field of electronics and communication engineering, in particular to a method for realizing high-resolution ranging by using chirp pulses. Background technique [0002] Radio waves travel in a straight line at a fixed speed in a homogeneous medium (the speed of propagation in free space is about the speed of light C). Such as figure 1 As shown, the observation point is at point A, and the target is at point B. The distance from the target to the observation point (ie, the slope distance) R can be measured by the time t required for one round trip of the radio wave. R Get, that is, R=C×t R / 2. While t R It is the delay of the echo relative to the transmitted signal. Therefore, the target distance measurement is to accurately determine the delay time t R . There are often multiple targets in the radar working area. Target resolution refers to the ability of the radar to distinguish two or more adjacent targets in a multi-target e...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/10G01S7/32
Inventor 邓兵刘贤忠张韫
Owner 邓兵
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com