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The device for measuring the level of ionospheric scattering signal based on fft

A scattering signal and ionosphere technology, applied in the direction of scattering propagation system, electrical components, transmission monitoring, etc., can solve the problems of unfixed signal deviation at the receiving end, large ionospheric scattering signal attenuation, and inability to improve detection sensitivity. Effect of small size, improved maneuverability and portability of equipment, and light weight

Active Publication Date: 2021-02-26
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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  • The device for measuring the level of ionospheric scattering signal based on fft
  • The device for measuring the level of ionospheric scattering signal based on fft
  • The device for measuring the level of ionospheric scattering signal based on fft

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Embodiment Construction

[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 scattering signal level testing device, which relates to a digital signal processing device for high-sensitivity level testing and ionospheric signal receiving level data analysis in the communication field. It consists of GPS synchronous timer, monitoring and control module, signal transmitting module, signal receiving module, FFT-based signal detection module, received signal data analysis module, test report generation, data storage and playback, power supply and other components. It adopts the method of FFT spectrum analysis to correct the receiving frequency value to obtain highly purified narrowband signal energy, eliminate the receiving frequency offset caused by system frequency offset and channel Doppler, compensate for the performance loss caused by increasing the detection window, and realize ionospheric The purpose of high-sensitivity detection of scattered signals. Moreover, the invention also has the characteristics of simple circuit structure, high degree of integration, stable and reliable performance, good portability, low cost, etc., and is especially suitable for ionospheric channel level testing systems.

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...

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Application Information

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Patent Type & Authority Patents(China)
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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