Method and circuit for improving dynamic range of high-frequency ground wave radar receiver

A technology of high-frequency ground wave radar and dynamic range, which is applied in the direction of radio wave reflection/reradiation, radio wave measurement systems, instruments, etc., to achieve the effects of good stability and consistency, good switching characteristics, and simple circuits

Inactive Publication Date: 2006-06-14
WUHAN UNIV
View PDF0 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the trailing edge of the direct wave suppression signal lags behind the trailing edge of the transmitted pulse, the lower the requirement for the dynamic range of the receiver, but the greater the offshore blind zone, sometimes it cannot meet the actual requirements

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
  • Method and circuit for improving dynamic range of high-frequency ground wave radar receiver
  • Method and circuit for improving dynamic range of high-frequency ground wave radar receiver
  • Method and circuit for improving dynamic range of high-frequency ground wave radar receiver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0043] see figure 1 A method and circuit for improving the dynamic range of a high-frequency ground wave radar receiver in an embodiment of the present invention mainly includes two identical gated attenuators, a fixed attenuator, an analog switch and a timing control circuit.

[0044] figure 2 The gated attenuator is mainly composed of PIN switching diodes. When the gated signal is at a high level, diodes D3 and D4 are in a reverse cut-off state due to reverse bias. At this time, the input and output terminals are disconnected, and the output terminal has no output. To achieve the purpose of attenuating the signal. When the gate control signal is at low level, the power supply current passes through inductors L1 and L2, diodes D3 and D4, and resistors R1 and R2 to make diodes D3 and D4 conduct. At this time, the input signal passes through coupling capaci...

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 method and circuit used to improve high frequency ground wave radar receiver dynamic range. Its features are sea echo signal are divided into two or multi ways; under the control of sequential control circuit, sea approach echo enter analog front end of the receiver after great attenuation; high sea echo directly enter it. This can make receiver have different sensitivity at different detecting distance to realize its word time gain control. The invention not only can hold echo amplitude and phase information, but also can reduce the demand of high frequency ground wave radar receiver dynamic range, corresponding to increase receiver transient dynamic range, and greatly increase phased array radar system action range.

Description

technical field [0001] The invention belongs to the technical field of high-frequency ground-wave marine radar environment monitoring, in particular to a method for improving the dynamic range of a high-frequency ground-wave radar receiver. Background technique [0002] High-frequency ground wave radar is mainly used to detect large-area ocean surface states and low-altitude and low-speed moving targets on the sea. The radar receiver will simultaneously receive long-distance and short-distance echo signals with greatly different amplitudes, which requires a high dynamic range for the receiver. The machine has stable amplitude-frequency characteristics and phase-frequency characteristics. Although the dynamic range of the receiver can be improved by using high-performance devices, automatic gain control circuits, short-range time gain control circuits, and logarithmic amplifiers, it will cause large distortion to the amplitude-frequency characteristics and phase-frequency ch...

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): G01S7/285G01S13/88
Inventor 陈泽宗柯亨玉杨子杰
Owner WUHAN 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