CN113852725A - Modulation-demodulation board card based on ARM and FPGA - Google Patents

Abstract

The invention provides a modulation and demodulation board card based on ARM and FPGA, which comprises a radio frequency unit, a baseband processing unit and a power supply unit, wherein the side edge of the board card is also provided with a signal receiving port RX and a signal sending port TX, and the radio frequency unit comprises a switch array, a band-pass filter, a third signal amplifier and a radio frequency transceiver chip which are sequentially connected; the baseband processing unit comprises an FPGA processing chip and an ARM processing chip, wherein the FPGA processing chip is in data connection with the radio frequency transceiver chip through an LDVS bus and is used for internal logic processing of signal coding, multiplexing, modulating and demodulating; and the ARM processing chip is connected with the FPGA processing chip through a data bus and is also in communication connection with the radio frequency transceiver chip through an SPI bus. The invention not only can demodulate and modulate the radio frequency signal, but also can monitor and control the processor in real time through the external terminal, thereby realizing the real-time control and parameter adjustment in the processes of receiving and transmitting the radio frequency signal, demodulating and modulating the signal, and the like.

Description

Modulation-demodulation board card based on ARM and FPGA

Technical Field

The invention relates to the technical field of flight control communication, in particular to a modulation and demodulation board card based on an ARM (advanced RISC machine) and an FPGA (field programmable gate array).

Background

In the technical field of flight control, in order to acquire and store and analyze aircraft operation data, a working condition instruction is issued to an aircraft, and data interaction and control are generally performed between a portable ground station and aircraft end equipment. In the data interaction and control process, an ARM and FPGA based modulation and demodulation board card installed in the portable ground station is used for carrying out radio frequency receiving, radio frequency demodulation and baseband demodulation on a downlink signal; and simultaneously generating an uplink signal, and performing radio frequency modulation and transmission.

The existing modulation and demodulation board card based on the ARM and the FPGA usually adopts a combination of a DSP chip and an FPGA chip as a processor to complete the demodulation and modulation of radio frequency signals, but in the process of communication with an aircraft, the real-time control capability is low, and the processor cannot be monitored and controlled in real time through an external terminal, such as parameter adjustment, event playback, data transmission and stop and the like.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the modulation and demodulation board card based on the ARM and the FPGA, which not only can demodulate and modulate radio-frequency signals, but also can monitor and control a processor in real time through an external terminal, and realize real-time control and parameter adjustment in the processes of receiving and transmitting the radio-frequency signals, demodulating and modulating signals and the like.

The technical scheme of the invention is as follows:

a modulation and demodulation board card based on ARM and FPGA comprises a radio frequency unit, a baseband processing unit and a power supply unit, wherein the baseband processing unit is in communication connection with the radio frequency unit through an LDVS interface, and a signal receiving port RX and a signal sending port TX are further arranged on the side edge of the board card and are in communication connection with the baseband processing unit.

The radio frequency unit comprises a switch array, a band-pass filter, a third signal amplifier and a radio frequency transceiver chip which are sequentially connected, wherein the radio frequency transceiver chip is used for carrying out analog-to-digital conversion and internal logic processing of transceiving on radio frequency signals subjected to band-pass filtering and signal amplification.

The baseband processing unit comprises an FPGA processing chip and an ARM processing chip, wherein the FPGA processing chip is in data connection with the radio frequency transceiver chip through an LDVS bus and is used for internal logic processing of signal coding, multiplexing, modulating and demodulating; the ARM processing chip is connected with the FPGA processing chip through a data bus and used for controlling internal logic processing of signals, and is also in communication connection with the radio frequency transceiver chip through an SPI bus and used for controlling receiving and sending of the signals; the FPGA processing chip is the core of the whole baseband processing, and is mainly responsible for acquiring radio frequency signals acquired by a radio frequency unit, demodulating the signals, sending the demodulated data to the ARM processing chip, receiving control signals of the ARM processing chip and data to be sent, modulating the signals of the data to be sent, and sending the data to be sent to the radio frequency transceiver chip.

Tracking, modulating and demodulating and the like the received signals; the ARM processing chip is used as a assistant processing unit to complete partial signal processing functions through data exchange with the FPGA processing chip, processed data are uploaded to the portable terminal device through the PCIE bus, and meanwhile control over other peripheral devices is achieved.

Furthermore, a first signal amplifier, a second signal amplifier and an antenna are arranged outside the modulation and demodulation board card based on the ARM and the FPGA, and the switch array is connected with the antenna through a signal receiving port RX and the first signal amplifier in sequence and is also connected with the antenna through a signal sending port TX and the second signal amplifier; the antenna mainly amplifies a received wireless radio frequency signal and converts the signal into a wired radio frequency electric signal; meanwhile, the transmitted wired radio frequency electric signal is amplified and converted into a wireless radio frequency signal.

Furthermore, a signal receiving switch and a signal sending switch are arranged in the switch array, a switch end of the signal receiving switch is connected with a first receiving end of the radio frequency transceiver chip after passing through the band-pass filter and the third signal amplifier in sequence, and the antenna, the first signal amplifier, the signal receiving switch, the band-pass filter, the third signal amplifier and the radio frequency transceiver chip form a signal receiving link.

The first sending end of the radio frequency transceiver chip is connected with the switch end of the signal sending switch through the band-pass filter, and the antenna, the second signal amplifier, the signal sending switch, the band-pass filter and the radio frequency transceiver chip form a signal sending link;

and the second sending end and the second receiving end of the radio frequency transceiver chip are in communication connection with the switch array.

Furthermore, the modulation and demodulation board card based on the ARM and the FPGA is also connected with terminal equipment and an encryption and decryption machine through a PCIE bus; the terminal equipment is used for configuring radio frequency signal parameters and controlling the receiving and sending of radio frequency signals through an ARM processing chip and a radio frequency transceiver chip; the system is also used for configuring parameters of baseband signals and controlling the transceiving, modulation and demodulation of the baseband signals through the ARM processing chip and the FPGA processing chip; meanwhile, the terminal equipment can also monitor, display, store, forward, play back and look up afterwards in real time, and manually trigger sending and stopping uplink data sending; and the encryption and decryption machine is used for encrypting or decrypting the uplink radio frequency signal or the downlink radio frequency signal.

After internal logic processing such as analog-to-digital conversion and the like is carried out on a downlink signal by a radio frequency unit, the downlink signal is sent to a baseband processing unit through an LDVS (low voltage switch) interface to carry out internal logic processing such as coding, multiplexing, demodulation and the like of the signal, and processed data are uploaded to terminal equipment through a PCIE (peripheral component interface express) bus; meanwhile, the baseband processing unit modulates the data to be transmitted and transmits the modulated data to the radio frequency unit, and the radio frequency unit performs internal logic processing such as digital-to-analog conversion and the like to obtain an uplink signal and transmits the uplink signal to the outside through an antenna. Therefore, through the combination of the processors of the ARM chip and the FPGA chip, the radio-frequency signal demodulation and modulation device can demodulate and modulate a radio-frequency signal, can monitor and control the processor in real time through the external terminal, and realizes real-time control and parameter adjustment in the processes of receiving and transmitting the radio-frequency signal, demodulating and modulating the signal and the like.

The modulation and demodulation board card based on the ARM and the FPGA has the advantages of compatibility with signal demodulation of various frequency bands, small volume, simple structure, easiness in design and implementation and the like, and has high reliability performances such as high data transmission speed, anti-interference performance and the like.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a modem board card based on an ARM and an FPGA according to an embodiment of the present invention.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

As shown in fig. 1, a modem board card based on ARM and FPGA includes a radio frequency unit, a baseband processing unit and a power supply unit communicatively connected to the radio frequency unit through an LDVS interface, a signal receiving port RX and a signal sending port TX communicatively connected to the baseband processing unit are further disposed on a side of the board card, the radio frequency unit includes a switch array, a band pass filter, a third signal amplifier 3 and a radio frequency transceiver chip, which are sequentially connected, and the radio frequency transceiver chip is configured to perform analog-to-digital conversion and internal logic processing of transceiving on a radio frequency signal subjected to band pass filtering and signal amplification.

The switch array is provided with a signal receiving switch and a signal sending switch, the switch end of the signal receiving switch is connected with the first receiving end of the radio frequency transceiver chip after passing through the band-pass filter and the third signal amplifier LNA3 in sequence, and the antenna, the first signal amplifier LNA1, the signal receiving switch, the band-pass filter, the third signal amplifier LNA3 and the radio frequency transceiver chip form a signal receiving link.

The first sending end of the radio frequency transceiver chip is connected with the switch end of the signal sending switch through the band-pass filter, and the antenna, the second signal amplifier LNA2, the signal sending switch, the band-pass filter and the radio frequency transceiver chip form a signal sending link; and the second sending end and the second receiving end of the radio frequency transceiver chip are in communication connection with the switch array.

The baseband processing unit comprises an FPGA processing chip and an ARM processing chip, wherein the FPGA processing chip is in data connection with the radio frequency transceiver chip through an LDVS bus and is used for internal logic processing of signal coding, multiplexing, modulating and demodulating; the ARM processing chip is connected with the FPGA processing chip through a data bus and used for exchanging data with the FPGA processing chip, and is also in communication connection with the radio frequency transceiver chip through an SPI bus and used for controlling the receiving and sending of signals.

The modulation and demodulation board card based on the ARM and the FPGA is also provided with a first signal amplifier LNA1, a second signal amplifier LNA2 and an antenna, and the switch array is connected with the antenna sequentially through a signal receiving port RX and the first signal amplifier LNA1 and is also connected with the antenna through a signal sending port TX and the second signal amplifier LNA 2.

The modulation and demodulation board card based on the ARM and the FPGA is also connected with terminal equipment and an encryption and decryption machine through a PCIE bus; the terminal equipment is used for configuring radio frequency signal parameters and controlling the receiving and sending of radio frequency signals through an ARM processing chip and a radio frequency transceiver chip; the system is also used for configuring parameters of baseband signals and controlling the transceiving, modulation and demodulation of the baseband signals through the ARM processing chip and the FPGA processing chip; and the encryption and decryption machine is used for encrypting or decrypting the uplink radio frequency signal or the downlink radio frequency signal.

In this embodiment, after performing internal logic processing such as analog-to-digital conversion and the like on an S-band downlink radio frequency signal by using a radio frequency unit, the S-band downlink radio frequency signal is sent to a baseband processing unit through an LDVS interface to perform internal logic processing such as encoding, multiplexing, and demodulation of the signal, and the processed data is uploaded to a terminal device through a PCIE bus; meanwhile, the baseband processing unit modulates the data to be transmitted and transmits the data to the radio frequency unit, and the radio frequency unit performs internal logic processing such as digital-to-analog conversion and the like to obtain an L-band uplink radio frequency signal and transmits the L-band uplink radio frequency signal to the outside through an antenna.

In the embodiment, the ARM processing chip is in communication connection with an external terminal, so that the parameter configuration of the processor, the transceiving control, the modulation and demodulation control of the radio frequency signal and the baseband signal and the real-time data monitoring are realized.

Claims (4)

1. The utility model provides a modulation and demodulation integrated circuit board based on ARM and FPGA, including radio frequency unit, through LDVS interface and radio frequency unit communication connection's baseband processing unit and power supply unit, the integrated circuit board side still is provided with signal reception port RX and signal transmission port TX with baseband processing unit communication connection, its characterized in that:

the radio frequency unit comprises a switch array, a band-pass filter, a third signal amplifier and a radio frequency transceiver chip which are sequentially connected, wherein the radio frequency transceiver chip is used for carrying out analog-to-digital conversion and internal logic processing of transceiving on radio frequency signals subjected to band-pass filtering and signal amplification;

the baseband processing unit comprises an FPGA processing chip and an ARM processing chip, wherein the FPGA processing chip is in data connection with the radio frequency transceiver chip through an LDVS bus and is used for internal logic processing of signal coding, multiplexing, modulating and demodulating; the ARM processing chip is connected with the FPGA processing chip through a data bus and used for exchanging data with the FPGA processing chip, and is also in communication connection with the radio frequency transceiver chip through an SPI bus and used for controlling the receiving and sending of signals.

2. The ARM and FPGA based modem board of claim 1, wherein:

the modulation and demodulation board card based on the ARM and the FPGA is also provided with a first signal amplifier, a second signal amplifier and an antenna, and the switch array is connected with the antenna sequentially through a signal receiving port RX and the first signal amplifier and is also connected with the antenna through a signal sending port TX and the second signal amplifier.

3. The ARM and FPGA based modem board of claim 2, wherein:

a signal receiving switch and a signal sending switch are arranged in the switch array, a switch end of the signal receiving switch is connected with a first receiving end of the radio frequency transceiver chip after passing through the band-pass filter and the third signal amplifier in sequence, and the antenna, the first signal amplifier, the signal receiving switch, the band-pass filter, the third signal amplifier and the radio frequency transceiver chip form a signal receiving link;

the first sending end of the radio frequency transceiver chip is connected with the switch end of the signal sending switch through the band-pass filter, and the antenna, the second signal amplifier, the signal sending switch, the band-pass filter and the radio frequency transceiver chip form a signal sending link;

and the second sending end and the second receiving end of the radio frequency transceiver chip are in communication connection with the switch array.

4. The ARM and FPGA based modem board of claim 1 or 2, wherein:

the modulation and demodulation board card based on the ARM and the FPGA is also connected with terminal equipment and an encryption and decryption machine through a PCIE bus; the terminal equipment is used for configuring radio frequency signal parameters and controlling the receiving and sending of radio frequency signals through an ARM processing chip and a radio frequency transceiver chip; the system is also used for configuring parameters of baseband signals and controlling the transceiving, modulation and demodulation of the baseband signals through the ARM processing chip and the FPGA processing chip; and the encryption and decryption machine is used for encrypting or decrypting the uplink radio frequency signal or the downlink radio frequency signal.

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