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

A Ranging and Velocity Measurement Method Combined with Hyperbolic Frequency Modulation and Linear Frequency Modulation

A technology of linear frequency modulation and hyperbolic frequency modulation, which is applied in the field of signal processing, can solve the problems of high cost and other problems, and achieve the effect of solving the problem of speed measurement and accurate distance measurement

Active Publication Date: 2022-07-29
QINGDAO AGRI UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional speed measurement method is to calculate the speed through a set of narrowband filter banks based on the radial velocity of the target relative to the sonar. The higher the accuracy of the speed measurement, the more the number of Doppler filter banks needs to be multiplied. This method the cost is too high

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 Ranging and Velocity Measurement Method Combined with Hyperbolic Frequency Modulation and Linear Frequency Modulation
  • A Ranging and Velocity Measurement Method Combined with Hyperbolic Frequency Modulation and Linear Frequency Modulation
  • A Ranging and Velocity Measurement Method Combined with Hyperbolic Frequency Modulation and Linear Frequency Modulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. A positive and negative linear frequency modulation signal ranging and speed measurement method, such as figure 1 As shown, the method includes the following steps:

[0036] S1) Suppose the target moves towards the sonar system, and its movement speed v is positive.

[0037] S2) First, a hyperbolic FM HFM signal is transmitted, and then a linear FM LFM signal is transmitted. The HFM signal and the LFM signal have no size relationship constraints on their respective transmission start and stop frequencies, and the frequency bands and pulse widths of the two signals are independently set.

[0038] The HFM signal and the LFM signal have no size relationship constraints on the starting and ending frequencies of their respective transmissions, which refers to f h0 with f h1 There is no size relationship limit between them, that is, f h0 >= f h1 wit...

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 a combined hyperbolic frequency modulation (HFM) and linear frequency modulation (LFM) ranging and speed measurement method, which mainly includes the following steps: 1) the target moves towards the sonar direction; 2) firstly, an HFM signal is transmitted, and then an LFM signal is transmitted. The starting and ending frequencies of HFM and LFM have no size relationship constraints, and the frequency bands and pulse widths of the two signals are independently set; 3) Find the time when the maximum value of the matched filter of the two signals appears respectively; 4) Use the HFM signal and The time-delay relationship of the LFM signal to calculate the distance and target velocity between the target and the sonar system. This method utilizes HFM+LFM combined signal speed measurement and ranging, eliminates the ranging error existing when a single HFM signal and a single LFM signal are ranging, and improves the speed and ranging accuracy. The parameters of HFM and LFM can be set independently, and it has more The flexible signal combination mode reduces computing costs and supports engineering applications.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a distance and speed measurement method combining hyperbolic frequency modulation and linear frequency modulation. Background technique [0002] Before the appearance of pulse compression, detection distance and resolution were a pair of irreconcilable contradictions in waveform design. The two can only be chosen as a compromise. The appearance of pulse compression solves this problem very well. In a large number of pulse compression signals , Linear Frequency Modulation (Linear Frequency Modulation, LFM) signal is particularly welcomed by signal designers because of its unique advantages and good pulse compression performance. [0003] Advantages of LFM include: [0004] 1) LFM has a certain Doppler tolerance, which is conducive to low-speed target detection; [0005] 2) LFM is a constant amplitude signal, which is beneficial to improve the transmission efficiency of...

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 Patents(China)
IPC IPC(8): G01S15/50G01S15/58
CPCG01S15/50G01S15/586G01S15/104G01S15/08
Inventor 宋彩霞
Owner QINGDAO AGRI UNIV
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