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

A high-frequency ground wave radar, dynamic range technology, used in the reflection/re-radiation of radio waves, radio wave measurement systems, instruments, etc., to achieve good switching characteristics, simple circuits, good stability and consistency

Inactive Publication Date: 2009-08-05
WUHAN UNIV
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  • 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

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  • 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

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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...

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Abstract

A method and circuit for improving the dynamic range of a high-frequency ground wave radar receiver, characterized in that: the ocean echo signal is divided into two or more channels after passing through the receiving antenna, and the long and short-range ground wave signal is used as the reference signal Under the control of the timing control circuit, the near-sea echo enters the analog front end of the receiver after a large attenuation, while the far-sea echo directly enters the analog front end of the receiver, so that the receiver has different sensitivities at different detection distances, thus realizing the reception Machine digital time gain control. The invention not only strictly retains the amplitude information and phase information of the echo, but also reduces the requirement of the high-frequency ground wave radar system on the dynamic range of the receiver, which is equivalent to improving the instantaneous dynamic range of the receiver and greatly increasing the phase control The range of action of the array radar system.

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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/285G01S13/88
Inventor 陈泽宗柯亨玉杨子杰
Owner WUHAN UNIV
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