Short wave analog receiver upgrading method based on quadrature detector

A technology of quadrature detection and upgrading, applied in angle demodulation through phase difference detection, amplitude modulation carrier system, electrical components, etc., can solve problems such as complex circuit structure, difficult debugging, limited application, etc., and achieve a large dynamic range , Novel system platform and wide range of applications

Inactive Publication Date: 2011-08-10
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the "baseband" signal extraction can be realized, the circuit structure of this method is complex and difficult to debug, and the harmonic components generated by the nonlinear effect of the mixer are rich and the loss is large, so the application is limited

Method used

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  • Short wave analog receiver upgrading method based on quadrature detector
  • Short wave analog receiver upgrading method based on quadrature detector
  • Short wave analog receiver upgrading method based on quadrature detector

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Embodiment

[0019] The embodiment of the modification method of the present invention is for example figure 1 As shown, the intermediate frequency output of the shortwave analog receiver 2 is connected to the input of the quadrature detector 1; the output of the quadrature detector 1 is connected to the linear input of the sound card of the personal computer 3, and after the signal enters the sound card for sampling, it can be A series of operations such as frequency spectrum display, digital filtering, demodulation, and noise elimination are carried out with the help of the personal computer 3 to realize the upgrading and transformation of the shortwave analog receiver 2 .

[0020] The embodiment of quadrature detector in the present invention is such as image 3 As shown, it includes an oscillator 7, a pulse generating circuit 8, a dual analog switch 9, a dual voltage follower 38, 39, a double integrator 10, a double inverting proportional amplifier 48, 49, and the pulse generating cir...

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Abstract

The invention discloses an upgrading alternation method for a short wave analog receiver which utilizes a quadraturedetector and a personal computer comprising a sound card to form a hardware platform that applies the software radio technology; wherein, the intermediate frequency output end of the short wave analog receiver is connected with the input end of the quadraturedetector; the output endof the quadraturedetector is connected with the linear input end of the sound card of the personal computer. The system has the advantages of novel and simple structure as well as being flexible, which is convenient to debug, so as to upgrade the traditional analog receiver into a novel receiver that can apply the software radio technology; thereby improving the properties greatly.

Description

(1) Technical field [0001] The invention relates to a method for upgrading and reforming a radio receiver, in particular to a method for upgrading and reforming a short-wave analog receiver based on a quadrature detector. (2) Background technology [0002] Among short-wave receiving equipment, analog receivers (hereinafter referred to as "simulators") still have a large amount of possession in various relevant departments including the military, non-committee at all levels, navigation, time service, meteorology, broadcasting, etc. . This part of the simulator is completely based on hardware and has a single function. Facing various challenges brought about by the continuous development of modern communication technology (more complex and harsh channel environment, endless new coding and modulation methods, etc.), it seems powerless. Moreover, due to the constraints of various factors such as the replacement cycle and funds, it is unlikely to be completely eliminated in a sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/68H04B1/10H04L27/02H03D3/06
Inventor 林异株李康
Owner SHANDONG UNIV
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