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FFT-based ionospheric scattered signal level test device

A scattering signal and ionospheric technology, applied in scattering propagation systems, electrical components, transmission monitoring, etc., can solve the problems of large ionospheric scattering signal attenuation, unstable signal deviation at the receiving end, and inability to improve detection sensitivity. The effect of improved mobility and portability, small size and light weight

Active Publication Date: 2019-04-12
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

[0002] The ionospheric scatter signal has a large attenuation, the receiving level is very weak, and a very high detection sensitivity is required. In order to improve the detection sensitivity, only a narrow-band purification method can be used, which is affected by the frequency deviation of the system and the Doppler frequency shift of the ionospheric scatter channel. Influenced by the influence, the signal deviation at the receiving end is not fixed, it is difficult to narrow-band purification, and the detection sensitivity cannot be improved

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  • FFT-based ionospheric scattered signal level test device
  • FFT-based ionospheric scattered signal level test device
  • FFT-based ionospheric scattered signal level test device

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[0016] refer to Figure 1 to Figure 3 , the present invention consists of GPS synchronous timer 1, signal transmission module 2, monitoring and control module 3, signal receiving module 4, signal monitoring module 5 based on FFT, received signal data analysis module 6, test report generation module 7, data storage and Playback 8, power supply 9 and other components are composed. figure 1 It is an electric principle block diagram of the present invention, and the embodiment is according to figure 1 Connect the lines. Among them, the function of the GPS synchronous timer 1 is to receive the external input GPS signal A, and analyze and process to obtain the timing information. The function of the signal transmission module 2 is to use the timing and control signals of the sending end provided by the monitoring and control module 3 to switch the signal waveform under the agreed GPS time tag, to ensure that both ends follow the same time reference, and send the generated controll...

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Abstract

The invention discloses an FFT-based ionospheric scattered signal level test device, and relates to a digital signal processing device for high-sensitivity level testing and ionospheric signal receiving level data analysis in the communication field. The FFT-based ionospheric scatter signal level test device is composed of a GPS synchronous timer, a monitoring and control module, a signal transmitting module, a signal receiving module, an FFT-based signal detection module, a receiving signal data analysis module, a test report generation module, a data storage and playback module, a power supply and other components. An FFT spectrum analysis method is used to correct a received frequency value to obtain highly-purified narrow-band signal energy, the received frequency deviation caused by system frequency deviation and channel Doppler is eliminated, the performance loss caused by increasing a detection window is made up, and the purpose of high-sensitivity detection of ionospheric scattered signals is achieved. The FFT-based ionospheric scattered signal level test device provided by the invention further has the advantages of being simple in circuit structure, high in integration degree, stable and reliable in performance, good in transportability, low in cost and the like, and is particularly suitable for an ionospheric channel level test system.

Description

technical field [0001] The invention discloses a device for testing ionospheric scattering signal level based on FFT, which can eliminate the receiving frequency offset caused by system frequency deviation and channel Doppler, compensate for the performance loss caused by increasing the detection window, and realize ionospheric signal The purpose of high-sensitivity detection. Background technique [0002] The ionospheric scatter signal has a large attenuation, the receiving level is very weak, and a very high detection sensitivity is required. In order to improve the detection sensitivity, only a narrow-band purification method can be used, which is affected by the frequency deviation of the system and the Doppler frequency shift of the ionospheric scatter channel. Due to the influence of the influence, the signal deviation at the receiving end is not fixed, it is difficult to narrow-band purification, and the detection sensitivity cannot be improved. In order to solve thi...

Claims

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Application Information

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IPC IPC(8): H04B17/318H04B7/22H04L27/00
CPCH04B7/22H04L27/0014H04L2027/0026H04L2027/0063H04L2027/0065H04B17/318
Inventor 宋迎东温亚萍孙利建平先仙张会珂王亚娟
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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