Short-wave receiving full-band radio frequency direct acquisition processing device

Abstract

The invention discloses a short wave receiving full-band radio frequency direct acquisition processing device. The device comprises a power supply module, a radio frequency front end module, a radio frequency sampling module and a sampling control synthesis module, received short-wave radio-frequency signals are filtered and amplified by the radio-frequency front-end module and then divided into eight groups of radio-frequency signals, the eight groups of radio-frequency signals are provided for the radio-frequency sampling module for diversity sampling, the sampled signals are combined in the sampling control synthesis module, and short-wave full-band sampling digital signals are output. The device has the advantages of being simple in structure, small in size, light in weight, high in electromagnetic compatibility, high in anti-interference capability and high in short wave signal receiving efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuit design, and particularly to a short-wave receiving full-band radio frequency direct sampling processing device. Background Art

[0002] The digitalization technology of channel machines and the software radio technology are the development directions of short-wave communication systems. The main idea is to place high-speed analog-to-digital and digital-to-analog converters as close to the antenna as possible, and use digital signal processing methods to achieve frequency conversion and modulation of short-wave communication signals. While improving the technical indicators of channel machines, it also has characteristics such as flexibility and openness, and is also an important technical basis for future multi-functional, multi-mode, programmable modular short-wave receivers. The rapid development of high-performance AD chips, large-scale processing chips, and digital signal processing technology provides support for short-wave communication equipment to adopt radio frequency direct digitalization technology.

[0003] In some short-wave communication application scenarios, due to the limited space of the carrying platform, the distance between the receiving and transmitting antennas is very close, and the signal coupled from the transmitting antenna to the receiving antenna is very strong. When multiple channels are transmitting, the receiving antenna may simultaneously sense multiple strong interferences, which will have effects such as blocking, intermodulation, and reciprocity on the receiving.

[0004] The utility model patent CN 210899173 U discloses a radio frequency processing circuit, a radio frequency antenna module, and an electronic device. By designing a directional coupling module with adjustable impedance value, the impedance value of the directional coupling module is adaptively matched according to different antennas, so that the impedance values of the antenna and the directional coupling module are the same, reducing the interference of the echo generated by the different impedance values of the antenna and the directional coupling module on the received signal, improving the receiving sensitivity of the radio frequency processing circuit, and improving the adaptability of the radio frequency chip to different antennas. However, its structure is complex, and its anti-blocking interference ability is insufficient, and it cannot meet the requirements of multi-channel transmission scenarios. Therefore, it is urgent to study a short-wave receiving full-band radio frequency direct sampling processing device to perform parallel capture of full-band signals and achieve large dynamic reception in the full band. Summary of the Invention

[0005] The purpose of the present invention is to provide a short-wave receiving full-band radio frequency direct sampling processing device with simple structure, small volume, light weight, strong electromagnetic compatibility, strong anti-interference ability, and high short-wave signal receiving efficiency.

[0006] The technical solution for achieving the purpose of the present invention is: a short-wave receiving full-band radio frequency direct sampling processing device, including a power supply module, a radio frequency front-end module, a radio frequency sampling module, and a sampling control synthesis module;

[0007] After the received short-wave radio frequency signal is filtered and amplified by the radio frequency front-end module, it is divided into 8 groups of radio frequency signals, which are provided to the radio frequency sampling module for diversity sampling. The signals after sampling are combined in the sampling control synthesis module, and the full-band sampling signal is output.

[0008] As a specific example, the radio frequency front-end module includes an input protection circuit, a filtering circuit, an attenuation control circuit, an amplification circuit, and a splitter circuit;

[0009] The input protection circuit performs input protection on the input signal to prevent large signals from damaging the receiver;

[0010] The filtering circuit uses a 30 MHz low-pass filter to suppress non-short-wave frequency interference signals;

[0011] The attenuation control circuit uses a 15 dB attenuation network. When the input signal is too large, the large signal is suppressed through the attenuation network;

[0012] The amplification circuit uses a high-linearity low-noise amplifier in the short-wave frequency band, with a signal gain of 16 dB, a noise figure of 1.2, and an output power third-order intermodulation of 35 dBm, which is used to improve the sensitivity and dynamic range of the whole machine;

[0013] The splitter circuit uses a one-to-sixteen splitter to divide the short-wave radio frequency signal into 16 paths of radio frequency signals, providing 16 paths of radio frequency signals for the back end.

[0014] As a specific example, the radio frequency sampling module includes a sampling circuit and an FPGA processing circuit;

[0015] The sampling circuit includes 8 identical sampling circuits. Each sampling circuit performs full-band sampling on 2 paths of radio frequency signals, converts the analog signal to a digital signal through A / D conversion, and then sends it to the FPGA processing circuit;

[0016] The FPGA processing circuit is used to perform digital signal operation processing and send the digital radio frequency signal to the sampling control synthesis module through a high-speed interface.

[0017] As a specific example, the ADC chip of the sampling circuit uses a BLAD16D125 analog-to-digital converter, with a sampling rate of 125 MHz, 16-bit data output, and a working bandwidth of 300 MHz; the signal-to-noise ratio SNR is 78.2 dB; the ADC chip uses a 64-pin QFN package and can work in the industrial temperature range of -40°C to 85°C without a heat sink; the spurious-free dynamic range SFDR of this chip can reach -95 dBc, which improves the dynamic range of the short-wave full-band receiver.

[0018] As a specific example, the sampling control synthesis module includes a clock distribution circuit and an FPGA processing circuit;

[0019] The clock circuit is the main clock of the short-wave receiving channel device and is used to provide differential clocks for each radio frequency sampling module inside the device;

[0020] The FPGA processing circuit is used to control the sampling chip, generate synchronous control commands and send them to the sampling modules respectively to make the sampling modules maintain a synchronous state, and perform synthesis processing on the sampled data and output it.

[0021] As a specific example, the radio frequency sampling module and the sampling control synthesis module share an FPGA processing circuit, and the FPGA processing circuit is used for the control of the sampling chip, the synthesis of the sampled data, and the output of the synthesized data.

[0022] As a specific example, the FPGA processing circuit uses an FPGA chip with the model number SMQ7K325TFFG900IP.

[0023] Compared with the prior art, the significant advantages of the present invention are as follows: (1) Adopting the short-wave full-band broadband sampling technology to realize the full-band sampling of radio frequency signals from 0.01 MHz to 30 MHz, reducing the number of antennas and improving the communication electromagnetic compatibility environment problem; (2) After the radio frequency signal is amplified analogously, it is directly sampled in the full band, directly converting the analog radio frequency signal into a digital radio frequency signal. The digital radio frequency signal is distributed to multiple digital processing modules for parallel capture of the full-band signal. Multiple ADs are used for parallel sampling to achieve large-dynamic reception in the full band; (3) The hardware circuit is simple, small in size, light in weight, strong in anti-blocking interference ability, enhancing the electromagnetic compatibility ability, improving the anti-interference ability, and improving the short-wave signal reception efficiency. Description of the Drawings

[0024] Figure 1 is the structural block diagram of a short-wave receiving full-band radio frequency direct sampling processing device of the present invention.

[0025] Figure 2 is the structural block diagram of the radio frequency front-end module in the present invention.

[0026] Figure 3 is the structural block diagram of the radio frequency sampling module in the present invention.

[0027] Figure 4 is the structural block diagram of the sampling control synthesis module in the present invention. Detailed Embodiments

[0028] The following combines the drawings and specific embodiments to further elaborate on the present invention in detail.

[0029] AsFigure 1 As shown in the figure, a short-wave receiving full-band radio frequency direct sampling processing device of the present invention includes a power supply module, a radio frequency front-end module, a radio frequency sampling module, and a sampling control synthesis module;

[0030] After the received short-wave radio frequency signal is filtered and amplified by the radio frequency front-end module, it is divided into 8 groups of radio frequency signals, which are provided to the radio frequency sampling module for diversity sampling. The signals after sampling are combined in the sampling control synthesis module to output a full-band sampling signal.

[0031] As a specific example, as Figure 2 shown in the figure, the radio frequency front-end module includes an input protection circuit, a filtering circuit, an attenuation control circuit, an amplification circuit, and a splitter circuit;

[0032] The input protection circuit performs input protection on the input signal to prevent large signals from damaging the receiver;

[0033] The filtering circuit uses a low-pass filter of 30 MHz to suppress non-short-wave frequency interference signals;

[0034] The attenuation control circuit uses a 15 dB attenuation network. When the input signal is too large, the large signal is suppressed through the attenuation network;

[0035] The amplification circuit uses a high-linearity low-noise amplifier in the short-wave frequency band, with a signal gain of 16 dB, a noise figure of 1.2, and an output power third-order intermodulation of 35 dBm, which is used to improve the sensitivity and dynamic range of the whole machine;

[0036] The splitter circuit uses a one-to-sixteen splitter to divide the short-wave radio frequency signal into 16 paths of radio frequency signals and provide 16 paths of radio frequency signals for the back end.

[0037] As a specific example, as Figure 3 shown in the figure, the radio frequency sampling module includes a sampling circuit and an FPGA processing circuit;

[0038] The sampling circuit includes 8 identical sampling circuits. Each sampling circuit performs full-band sampling on 2 paths of radio frequency signals, converts the analog signal to a digital signal through A / D conversion, and then sends it to the FPGA processing circuit;

[0039] The FPGA processing circuit is used to perform digital signal operation processing and send the digital radio frequency signal to the sampling control synthesis module through a high-speed interface.

[0040] As a specific example, the ADC chip of the sampling circuit uses the BLAD16D125 analog-to-digital converter, with a sampling rate of 125 MHz, 16-bit data output, and a working bandwidth of 300 MHz; the signal-to-noise ratio SNR is 78.2 dB; the ADC chip uses a 64-pin QFN package and can work in the industrial temperature range of -40°C to 85°C without a radiator; the spurious-free dynamic range SFDR of this chip can reach -95 dBc, improving the dynamic range of the short-wave full-band receiver.

[0041] As a specific example, as Figure 4 shown, the sampling control and synthesis module includes a clock distribution circuit and an FPGA processing circuit;

[0042] The clock circuit is the main clock of the short-wave receiving channel device and is used to provide differential clocks for each radio frequency sampling module inside the device;

[0043] The FPGA processing circuit is used to control the sampling chip, generate synchronous control commands and send them to the sampling modules respectively to make the sampling modules maintain a synchronous state, and perform synthesis processing on the sampled data and output it.

[0044] As a specific example, the radio frequency sampling module and the sampling control and synthesis module share an FPGA processing circuit, and the FPGA processing circuit is used for controlling the sampling chip, synthesizing the sampled data, and outputting the synthesized data.

[0045] As a specific example, the FPGA processing circuit uses an FPGA chip with the model number SMQ7K325TFFG900IP.

[0046] The short-wave receiving full-band radio frequency direct sampling processing device provided by the present invention is used to achieve full-band sampling of radio frequency signals from 0.01 MHz to 30 MHz, and remotely transmit the sampled and processed signals through optical fibers. Compared with the prior art, the hardware implementation is simple, the volume is small, the weight is light, the electromagnetic compatibility ability is improved, the anti-interference ability is improved, and the short-wave signal receiving efficiency is improved.

[0047] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A shortwave receiving full-band RF direct acquisition processing device, characterized in that: It includes a power module, a radio frequency front-end module, a radio frequency sampling module and a sampling control synthesis module; The received shortwave RF signal is filtered and amplified by the RF front-end module and then divided into 8 groups of RF signals, which are provided to the RF sampling module for diversity sampling. After sampling, the signals are merged in the sampling control synthesis module to output shortwave full-band sampling digital signals.

2. The shortwave receiving full-band RF direct acquisition processing device according to claim 1 is characterized in that: The radio frequency front-end module includes an input protection circuit, a filter circuit, an attenuation control circuit, an amplifier circuit and a splitter circuit; The input protection circuit performs input protection on the input signal; The filtering circuit uses a 30MHz low-pass filter to suppress non-shortwave frequency interference signals; The attenuation control circuit uses a 15dB attenuation network. When the input signal is too large, the large signal is suppressed through the attenuation network. The amplification circuit adopts a high linearity low noise amplifier in the short wave frequency band, with a signal gain of 16dB, a noise figure of 1.2, and an output power third-order intermodulation of 35dBm; The splitter circuit adopts a one-to-sixteen splitter to divide the shortwave radio frequency signal into 16 radio frequency signals, and provides 16 radio frequency signals for the back end.

3. The shortwave receiving full-band RF direct acquisition processing device according to claim 1 is characterized in that: The RF sampling module includes a sampling circuit and an FPGA processing circuit; The sampling circuit includes 8 identical sampling circuits, each sampling circuit performs full-band sampling on 2-channel RF signals, converts the analog signals A / D into digital signals, and then sends them to the FPGA processing circuit; The FPGA processing circuit is used to perform digital signal calculation processing and send the digital radio frequency signal to the sampling control synthesis module through a high-speed interface.

4. The shortwave receiving full-band RF direct acquisition processing device according to claim 3 is characterized in that: The ADC chip of the sampling circuit adopts a BLAD16D125 analog-to-digital converter, with a sampling rate of 125MHz, 16-bit data output, and a working bandwidth of 300MHz; the signal-to-noise ratio SNR is 78.2dB; and the ADC chip adopts a 64-pin QFN package.

5. The shortwave receiving full-band RF direct acquisition processing device according to claim 1 is characterized in that: The sampling control synthesis module includes a clock distribution circuit and an FPGA processing circuit; The clock circuit is the master clock of the shortwave receiving channel device, and is used to provide a differential clock for each RF sampling module inside the device; The FPGA processing circuit is used to control the sampling chip, generate synchronization control commands and send them to the sampling modules respectively, so that the sampling modules maintain a synchronous state, and synthesize and process the sampled data for output.

6. The shortwave receiving full-band RF direct acquisition processing device according to claim 5 is characterized in that: The RF sampling module and the sampling control synthesis module share a FPGA processing circuit, and the FPGA processing circuit is used for controlling the sampling chip, synthesizing the sampled data, and outputting the synthesized data.

7. The shortwave receiving full-band RF direct acquisition processing device according to claim 6 is characterized in that: The FPGA processing circuit adopts an FPGA chip of model SMQ7K325TFFG900IP.

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