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Digital ionosonde

An ionospheric altimeter and ionospheric technology, which is applied to radio wave measurement systems, instruments, and measurement devices, can solve the problems of limited output data bit width and dynamic range limitation of digital down-conversion chips, so as to improve dynamic range, The effect of improving the signal-to-noise ratio

Inactive Publication Date: 2014-04-02
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

DPS-4 is a digital ionospheric altimeter system. In its design, digital up- and down-conversion chips are used to realize waveform synthesis and digital down-conversion functions, such as the GC5016 and AD9857 chips used. This design eliminates the analog down-conversion The phenomenon of unbalanced I and Q channels in the medium, but due to the limited output data bit width of the digital down-conversion chip, the dynamic range of the output I and Q signals is limited

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Embodiment Construction

[0045] The present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that the described examples are intended to facilitate the understanding of the present invention, rather than limiting it in any way.

[0046] figure 1 It is a block diagram showing the composition of the CAS-DIS digital ionospheric altimeter of the present invention. The CAS-DIS digital ionospheric altimeter of the present invention is as figure 1 As shown, it mainly includes a control signal generating unit 1 , a transmitting channel 2 , a receiving channel 3 , an antenna system 4 , pulse compression processing and a display and control terminal 5 .

[0047] The working sequence of the CAS-DIS digital ionospheric altimeter is that the upper computer software first downloads the configuration parameters to the internal parameter RAM of the FPGA through the PCI interface, and then generates a corresponding reset signal, and the control signal gener...

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Abstract

The invention discloses a digital ionosonde, which is used for ionospheric sounding and data receiving processing. A digital down-conversion processing unit comprises a digital mixer, an integral decimation filter, a compensation filter and a programmable filter. Signals which are quantified by a digital-to-analog converter, and sine local oscillator signals and cosine local oscillator signals which are produced by a frequency synthesis unit are input into the digital mixer, output signals of the digital mixer are input into the integral decimation filter, the integral decimation filter performs preset multiples of decimation and lowpass filtering processing on mixed signals, the compensation filter performs amplitude compensation on the output signals of the integral decimation filter, and the programmable filter further performs decimation filtering processing. Therefore, the influence of I and Q channel unbalance caused by analog down-conversion is effectively eliminated.

Description

technical field [0001] The invention relates to the technical field of space ionospheric radio detection, in particular to an ionospheric altimeter based on the idea of ​​software radio. Background technique [0002] Ionospheric vertical sounding is a technique for daily observation of the ionosphere from the ground with high-frequency radio waves. The detection equipment used by this technique is called an ionospheric altimeter (or called a vertical survey instrument). It transmits radio pulses whose frequency varies with time vertically upwards, receives the ionospheric reflection signals of these pulses at the same place, measures the round-trip transmission delay of the radio wave, and obtains the relationship between reflection height and frequency. Such a curve is called a frequency altimetogram or a vertical ionogram. [0003] This detection method was invented by G. Bright and M.A. Tuf in the United States in 1925, and it is still the most basic means of ionospheri...

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Application Information

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IPC IPC(8): G01S13/08
CPCG01S7/288G01S13/28G01S7/2886
Inventor 方广有王顺张锋宫兆前陈紫微
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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