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L wave section low phase noise frequency source

A low phase noise, frequency source technology, applied in the field of radar systems, can solve problems such as limited range of use, short frequency conversion time, limited frequency resolution, etc., achieve good spurious suppression performance, short frequency hopping time interval, and improve system reliability sexual effect

Active Publication Date: 2018-05-01
WEST ANHUI UNIV
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Problems solved by technology

[0003] Direct analog synthesis technology (DAS) is based on the frequency generated by a stable oscillator, through frequency division, frequency multiplication, frequency mixing and filtering, to generate various frequencies required, with the advantages of low phase noise and short frequency conversion time, etc. There are disadvantages such as complex system design, low spectral purity, and too many spurious components
[0004] Direct digital synthesis technology (DDS) is to directly digitally sample the reference clock, use digital processing technology to convert the frequency through digital-to-analog conversion, and convert the frequency with continuous phase to generate a high-resolution frequency signal in real time, with high frequency resolution and fast frequency conversion time , continuous output phase, flexible structure, etc., but due to its high phase noise and low upper limit of output frequency, the scope of application is limited
[0005] The indirect frequency synthesis technology (PLL) is based on the frequency generated by the stable oscillator, and uses the characteristics of the phase-locked loop or phase-locked frequency multiplication to generate the required frequency. It has an extremely wide frequency range, good spurious suppression performance, and the output spectrum High purity, small size and other advantages, but there are disadvantages such as long frequency conversion time and limited frequency resolution
[0006] None of the above frequency source synthesis methods can fully meet the requirements of the L-band low-altitude radar system, so it is urgent to provide a new type of L-band low-phase noise frequency source to solve the above problems

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  • L wave section low phase noise frequency source
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Embodiment Construction

[0031] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0032] see figure 1 and figure 2 , the embodiment of the present invention includes:

[0033] An L-band low-phase-noise frequency source mainly includes a reference source module, a clock signal module, a local oscillator signal module, and a control circuit module.

[0034] The reference source module mainly includes a crystal oscillator signal source and a power divider. The 80MHz reference source signal generated by the crystal oscillator signal source is divided into four channels through the power divider, and is respectively output to the clock signal module, the local oscillator signal module, and the control circuit module to generate ...

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Abstract

The invention discloses an L wave section low phase noise frequency source, which comprises a reference source module, a clock signal module, a local oscillator signal module and a control circuit module; the reference source module generates 80 MHz reference source signal and outputs to the clock signal module, the local oscillator signal module and the control circuit module; the clock signal module is used for realizing a quartered frequency of the reference source signal and generating 20 MHz clock signal and the power detecting signal of a radar system; the control circuit module mainly comprises a FPGA control circuit and is used for controlling the local oscillator signal module and to output the frequency signal and receive the reference source signal and power detecting source forjudging the system fault information. By adopting the frequency synthesis method combining direct simulation synthesis and direct digital synthesis, the frequency source has low phase noise, high output spectrum purity, short frequency skipping time interval, good parasitic suppression performance, and high frequency resolution rate.

Description

technical field [0001] The invention relates to the field of radar systems, in particular to an L-band low-phase-noise frequency source. Background technique [0002] In order to obtain the processing gain of coherent signal, strong clutter suppression ability and anti-interference ability, L-band low-altitude radar can realize the effective detection of low-altitude small targets in the background of clutter, and the phase noise, spectral purity and frequency hopping conversion time of the frequency source etc. have higher performance requirements. This requires that the radar system design chooses a reasonable frequency synthesis method. At present, the main frequency synthesis methods include direct analog synthesis technology, direct digital synthesis technology and indirect frequency synthesis technology. [0003] Direct analog synthesis technology (DAS) is based on the frequency generated by a stable oscillator, through frequency division, frequency multiplication, fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/282G01S7/40H03L7/18H03L7/093
CPCH03L7/093H03L7/18G01S7/282G01S7/40Y02A90/10
Inventor 蔡翠翠王本有符茂胜孟宪猛赵仁义王梅
Owner WEST ANHUI UNIV
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