Ship radar receiver

A marine radar and receiver technology, which is applied in the field of marine radar receivers, can solve the problems of image frequency affecting the work of marine radar receivers, increasing the noise factor of marine radar receivers, and indicators that cannot meet high-frequency requirements, etc., to achieve reduction Noise figure, reduced amplification, improved image rejection

Inactive Publication Date: 2015-10-28
NINGBO CHENGDIAN TAIKE ELECTRONICS INFORMATION TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing marine radar receivers have the following problems: 1. After the target signal received by the receiving antenna passes through the two-stage low-noise amplifier, the noise signal carried in the target signal will also be amplified, thereby increasing the receiving capacity of the marine radar. The noise figure of the machine; 2. The limiter in the two-stage low-noise amplifier has loss, and its loss further increases the noise figure of the marine radar receiver; 3. The pre-selected band-pass filter is realized by an ordinary band-pass filter chip , its index cannot meet the high-frequency requirements, thus causing the marine radar receiver to only receive medium and low-frequency target signals; 4. The RF input end of the single mixer is easy to mismatch, and it is easy to generate image frequencies, which will affect the work of the marine radar receiver

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment one: if figure 1 As shown, a marine radar receiver includes a receiving antenna, a microstrip bandpass filter, a first-stage low-noise amplifier, a second-stage low-noise amplifier, a 3db bridge, a first mixer and a second mixer , the 3db bridge has a first output terminal, a second output terminal and an input terminal, the first mixer has a first input terminal, a second input terminal and an output terminal, the circuit mechanism of the second mixer and the first mixer The device is the same, the input end of the microstrip band-pass filter is connected to the receiving antenna, the output end of the microstrip band-pass filter is connected to the input end of the first-stage low-noise amplifier, and the output end of the first-stage low-noise amplifier is connected to the second-stage low-noise amplifier. The input terminal of the first-stage low-noise amplifier is connected, the output terminal of the second-stage low-noise amplifier is connected to the ...

Embodiment 2

[0026] Embodiment two: if figure 1 As shown, a marine radar receiver includes a receiving antenna, a microstrip bandpass filter, a first-stage low-noise amplifier, a second-stage low-noise amplifier, a 3db bridge, a first mixer and a second mixer , the 3db bridge has a first output terminal, a second output terminal and an input terminal, the first mixer has a first input terminal, a second input terminal and an output terminal, the circuit mechanism of the second mixer and the first mixer The device is the same, the input end of the microstrip band-pass filter is connected to the receiving antenna, the output end of the microstrip band-pass filter is connected to the input end of the first-stage low-noise amplifier, and the output end of the first-stage low-noise amplifier is connected to the second-stage low-noise amplifier. The input terminal of the first-stage low-noise amplifier is connected, the output terminal of the second-stage low-noise amplifier is connected to the ...

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Abstract

The invention discloses a ship radar receiver. The ship radar receiver comprises a receiving antenna, a microstrip band-pass filter, a first stage low-noise amplifier, a second stage low-noise amplifier, a 3db bridge, a first mixer and a second mixer. The 3db bridge is provided with a first output end, a second output end and an input end. An input end of the microstrip band-pass filter is connected with the receiving antenna, and an output end is connected with an input end of the first stage low-noise amplifier. An output end of the first stage low-noise amplifier is connected with an input end of the second stage low-noise amplifier. An output end of the second stage low-noise amplifier is connected with the input end of the 3db bridge. A radio frequency input end of the first mixer is connected with the first output end of the 3db bridge, and radio frequency input end of the second mixer is connected with the second output end of the 3db bridge. The ship radar receiver has the advantages that the noise coefficient of the ship radar receiver is reduced, the mirror image inhibition is improved, and the cost is saved.

Description

technical field [0001] The invention relates to a radar receiver, in particular to a marine radar receiver. Background technique [0002] The marine radar receiver is an essential part of the marine radar to realize ship positioning, narrow waterway piloting and navigation avoidance. The existing marine radar receiver usually includes receiving antenna, two-stage low-noise amplifier, pre-selected band-pass filter and single mixer. The two-stage low-noise amplifier consists of the first-stage low-noise amplifier, limiter, The composition of the noise amplifier, the receiving antenna is connected to the first-stage low-noise amplifier, the first-stage low-noise amplifier is connected to the limiter, the limiter is connected to the second-stage low-noise amplifier, and the pre-selection band-pass filter generally adopts ordinary band-pass filtering chip, the second-stage low-noise amplifier chip is connected to the pre-selected band-pass filter, the pre-selected band-pass filt...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01S7/285G01S7/35
CPCG01S7/285G01S7/352
Inventor胡丽霞田丹陈薇段衍东赵国栋
OwnerNINGBO CHENGDIAN TAIKE ELECTRONICS INFORMATION TECH DEV