High-frequency software radio receiving system
A technology of software radio and receiving system, applied in the direction of radio wave measurement system, transmission system, electrical components, etc., can solve the problems of large and complex circuits, low signal processing speed and efficiency, etc., and achieve compact circuit structure and low cost Effect
Inactive Publication Date: 2014-03-26
NANCHANG UNIV
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Problems solved by technology
At present, the circuit of this design generally includes a frequency mixing unit, etc., which makes the circuit overall relatively large and complex, which limits the frequency of the received signal, the processing speed and efficiency of the signal are also very low, and the maintenance and application cost is also high, so it cannot be applied to Mobile and flexible small radar construction
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[0013] The present invention is realized like this, as figure 1 As shown, it includes a receiving antenna, a filter circuit, a low-noise amplifier circuit, an automatic gain control circuit, an A / D conversion unit, an A / D sampling unit, and 2 SMA connectors; the receiving antenna is connected to the A / D conversion unit , one SMA connector is respectively connected to the A / D conversion unit, receiving antenna and filter circuit, the other SMA connector is also connected to the filter circuit, and external clock source, filter circuit, low noise amplifier circuit, automatic gain control circuit and A / D The sampling units are connected in series in sequence, and an EEPROM circuit is also inserted into the high-frequency software radio system;
[0014] Receiving antenna: The receiving antenna of the system is designed to receive shortwave in the DC-30MHz frequency band;
[0015] Filter circuit: This circuit mainly uses a low-pass filter circuit, which can not only filter out unw...
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The invention relates to a high-frequency software radio receiving system which comprises a receiving antenna, a filter circuit, a low-noise amplification circuit, an automatic gain control circuit, an A / D (analog to digital) conversion unit, an A / D sampling unit and two SMA connectors. The high-frequency software radio receiving system is characterized in that the receiving antenna used for receiving short waves in DC-30MHz frequency band is connected with the A / D conversion unit, one SMA connector is connected with the A / D conversion unit, the receiving antenna and the filter circuit, the other SMA connector is also connected with the filter circuit and externally connected with a clock source, the filter circuit, the low-noise amplification circuit, the automatic gain control circuit and the A / D sampling unit are connected serially and sequentially, and the high-frequency software radio receiving system is further inserted with an EEPROM (electrically erasable programmable read-only memory) circuit. The receiving system can directly receive broadband radio frequency signals and convert the same into intermediate frequency signals, and further can directly enter an analog to digital conversion module to perform a series of processing such as sampling. The receiving system has the advantages of compact circuit structure and low cost, and is extremely suitable for setting up small radar systems.
Description
technical field [0001] The invention relates to the technical field of high frequency general software radio, in particular to a high frequency software radio receiving system. Background technique [0002] The high frequency software radio receiving system is a radio frequency receiving system working at 6MHz-30MHz. It involves ultra-wideband antenna theory and technology, low-noise amplifier circuit design, application of low-pass filter circuit, and access to eeprom chips. The most common application form of high-frequency software radio receiving system is to build a software radio system, which is generally used as the RF front-end of high-frequency general software radio system, and its function is to down-convert the received signal to baseband to realize analog RF signal and analog The conversion between intermediate frequency signals solves the problem that the rate and accuracy of A / D and D / A cannot directly sample RF analog signals. It can receive electromagnetic...
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IPC IPC(8): G01S7/285G01S7/35H04B1/16
CPCG01S7/03H04B1/16
Inventor 姚明邓晓华魏葵白波
Owner NANCHANG UNIV