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Quadrature-modulation-based echo Doppler frequency simulation device

An echo Doppler and quadrature modulation technology, applied in the field of echo Doppler frequency simulation devices, can solve the problems of complex overall circuit structure, low frequency accuracy, and large power consumption, and achieve good frequency stability and high frequency accuracy , the effect of low power consumption

Inactive Publication Date: 2018-05-29
GUIZHOU AEROSPACE ELECTRONICS TECH
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Problems solved by technology

[0005] Then, in the above method, the echo Doppler frequency simulation realized by the high-precision signal source with the carrier frequency plus Doppler frequency has low frequency accuracy, complex overall circuit structure, large power consumption, and high cost.

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  • Quadrature-modulation-based echo Doppler frequency simulation device

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Embodiment Construction

[0018] The technical solution of the present invention is further described below, but the scope of protection is not limited to the description.

[0019] Such as figure 1 An echo Doppler frequency simulation device based on quadrature modulation is shown; the local oscillator signal and the ground wire are connected to the power divider, and the power divider is divided into two outputs, and the two routes are respectively connected to the mixer A and the The mixer B is then connected to the input terminal of the combiner; the mixer A and the mixer B are respectively connected to two orthogonal signals IF1 and IF2.

[0020] The local oscillator signal is an orthogonal signal input by radio frequency.

[0021] The two quadrature signals IF1 and IF2 have the same frequency and amplitude but a phase difference of 90°.

[0022] The power splitter is a 90° power splitter.

[0023] The power divider outputs two signals which are sine modulation signal and cosine modulation signa...

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Abstract

The invention provides a quadrature-modulation-based echo Doppler frequency simulation device. A local oscillator signal and a ground line are connected to a power divider through two paths; the powerdivider carries out outputting based on two paths; the two paths are connected to a mixer A and a mixer B respectively and then are connected to an input terminal of a combiner; and the mixer A and the mixer B are connected to two paths of orthogonal signals IF1 and IF2. According to the invention, on the basis of combination of the quadrature modulation phase method and the mixing technology, modulation of the echo Doppler frequency is realized; and different echo Doppler frequencies can be simulated by changing the frequency of the quadrature modulation signal. Therefore, the quadrature-modulation-based echo Doppler frequency simulation device has advantages of high suppression, high frequency accuracy, high frequency stability, low power consumption, and good economy.

Description

technical field [0001] The invention relates to an echo Doppler frequency simulation device based on quadrature modulation. Background technique [0002] The simulation of echo Doppler frequencies plays an important role in the testing of modern radars. With the continuous development of digital signal processing technology and microwave technology, new technology can be used to simplify the previous tedious and complicated echo Doppler frequency simulation method with higher harmonic suppression, which is closer to the real target reflection echo. wave signal. [0003] The detection signal emitted by the radar is received by the radar after being reflected by the target. Due to the relative motion speed between the two, it can be known from the principle of the Doppler effect that the echo signal received by the radar has an certain frequency offset. Echo Doppler frequency simulation is to simulate the frequency offset. [0004] At present, the widely used echo Doppler ...

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Application Information

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IPC IPC(8): G01S7/40
CPCG01S7/4052
Inventor 魏伟
Owner GUIZHOU AEROSPACE ELECTRONICS TECH
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