CN114363581A - Real-time video and serial port data wireless transmission system based on ZYNQ-7000 chip - Google Patents

Abstract

The invention provides a ZYNQ-7000 chip-based real-time video and serial data wireless transmission system, which comprises a real-time video and serial data wireless transmitting system (1) and a real-time video and serial data wireless receiving system (2). The transmitting system (1) realizes the fusion of TS code stream and serial port data, the wireless transmission of TS format data and the gating of radio frequency signals of different frequency bands; the receiving system (2) realizes the receiving of radio frequency signals, the demodulation of the radio frequency signals and the extraction of TS code streams and serial port data. The PS terminal based on the ZYNQ-7000 chip can carry a Linux system, so that the management interface is more convenient; the PL terminal is an FPGA, can receive data in parallel and has high data processing speed. The system fuses the serial port data into the TS video signal, improves the diversity of transmission contents and enhances the confidentiality of transmission; the wireless transmission system of the invention has small volume, easy carrying and flexible use, and can be applied to the video and data wireless transmission of industry and military.

Description

Real-time video and serial port data wireless transmission system based on ZYNQ-7000 chip

Technical Field

The invention discloses a ZYNQ-7000 chip-based real-time video and serial port data wireless transmission system, belongs to the field of wireless communication, and relates to technologies such as embedded system frame design, wireless radio frequency transmission, TS code stream data fusion and the like. The wireless video real-time transmission system has stronger flexibility and video transmission stability, is widely applied to the military field, and is also more and more widely applied to civil use.

Background

With the increasing application of unmanned aerial vehicles in the fields of aerial photography, power inspection and the like, a wireless video transmission system matched with the unmanned aerial vehicles also becomes a crucial link in an unmanned aerial vehicle system. Aiming at the characteristics of miniaturization, limited load, frequent need of remote operation and the like of the unmanned aerial vehicle, the requirement of people on video quality is higher and higher; the invention designs a real-time wireless video and serial port data transmission system with small volume, light weight, strong confidentiality and real time by utilizing the flexibility of the wireless communication technology.

The wireless transmission system for the real-time video and the serial port data based on the ZYNQ-7000 chip, provided by the invention, can receive videos in various formats, convert the received videos in different formats into the videos in the TS format and simultaneously fuse the received serial port data into a new TS code stream; in addition, the Linux system is operated in the ZYNQ-7000 chip, so that debugging is convenient, and good development capability and human-computer interaction function can be provided.

Disclosure of Invention

The invention provides a ZYNQ-7000 chip-based real-time video and serial port data wireless transmission system, which can realize the fusion of TS code stream and serial port data, the wireless transmission of TS format video data and the gating of radio frequency signals of different frequency bands; receiving a wireless TS format video signal, demodulating a radio frequency signal, and extracting a TS code stream and serial port data.

The invention discloses a ZYNQ-7000 chip-based real-time video and serial port data wireless transmission system, wherein the connection relation and the functions of related modules in the system are as follows:

1. the utility model provides a real-time video and serial ports data wireless transmission system based on ZYNQ-7000 chip divide into real-time video and the wireless transmitting system of serial ports data (1) and real-time video and the wireless receiving system of serial ports data (2), and its characterized in that system can also send and receive the serial ports data of host computer when carrying out video transmission, and its specific flow is as follows:

1.1 in a real-time video and serial data wireless transmitting system (1), a ZYNQ-7000 module (9) receives a TS code stream output by a compression coding module (3), simultaneously receives data input by a serial module (6) of a host device (5), and processes the received serial data and the TS code stream to form a pseudo TS code stream; the pseudo TS code stream is transmitted to a modulation transmitting module (10) through a USB interface for modulation, then radio frequency channel selection, filtering and amplification processing are carried out through a radio frequency switch selection module (11), a filter module (12) and an amplifier module (13), and finally the pseudo TS code stream is transmitted out through an antenna;

1.2 in the wireless receiving system (2) of real-time video and serial port data, the radio frequency signal received by the antenna is amplified by a low noise amplifier module (14), and clutter is filtered by a filter module (15); and the radio frequency signal is processed into a pseudo TS code stream by a receiving and demodulating module (16), the pseudo TS code stream is transmitted to a ZYNQ-7000 module (21) through a USB interface for analysis, the pseudo TS code stream is divided into a video TS stream and serial port data, the video TS stream is transmitted to a decoding and decompressing module (22), and the serial port data is transmitted to the host equipment (17) through a serial port module (18).

2. The ZYNQ-7000 chip-based real-time video and serial data wireless transmission system as claimed in claim 1, wherein the compression encoding module (3) and the decoding decompression module (22) perform the compression and decompression of the video data, and simultaneously, the ZYNQ-7000 modules (9, 21) are used to complete the fusion or parsing of the video data and the serial data.

3. The ZYNQ-7000 chip-based real-time video and serial data wireless transmission system as claimed in claim 1, wherein the drivers of the modulation transmitting module (10) and the demodulation receiving module (16) are both operated on the Zynq-7000 Linux system in a dynamic loading manner; the modulation transmitting module (10) can receive the video signal in the TS format or receive the control signal only through the USB interface, and control the transmitting frequency band and the bandwidth of the transmission signal.

4. The wireless transmission system of real-time video and serial data based on the ZYNQ-7000 chip as claimed in claim 1, wherein the method for fusing the video TS stream data and the serial data to form the pseudo TS stream data comprises: putting the video TS stream into FIFO of a ZYNQ-7000 module (9); and adding a packet header to the serial port information according to the format of the TS packet to convert the serial port information into TS code stream data, and then placing the TS code stream data into an FIFO (first in first out) so as to insert the serial port data into the video TS stream, wherein the video TS stream and the serial port data are analyzed and distinguished through the packet header.

The invention has the following advantages:

1. the invention fuses the serial port data and the TS code stream into the pseudo TS stream for transmission, so that the serial port data can be transmitted while the video data is transmitted wirelessly, and the security of transmission is enhanced.

2. The system completes the compression and decompression of the video data by using the compression coding module and the decoding decompression module, and simultaneously completes the fusion of the video data and the serial port data by using the ZYNQ-7000 module.

3. According to the invention, a ZYNQ-7000 chip is used for building a real-time video and serial data wireless transmitting and receiving system, and a Linux system can be carried at the PS end of the chip, so that the management interface is more convenient; the PL terminal is an FPGA, can receive data in parallel and has high data processing speed. The system has the characteristics of small volume, easy carrying and flexible use.

Drawings

FIG. 1 is a block diagram of a wireless transmission system for real-time video and serial data based on a ZYNQ-7000 chip;

FIG. 2 is a block diagram of a wireless transmitting system for real-time video and serial data based on a ZYNQ-7000 chip;

FIG. 3 is a block diagram of a wireless receiving system for real-time video and serial data based on a ZYNQ-7000 chip according to the present invention;

FIG. 4 is a hardware connection diagram of the TS code stream data and serial port data fusion of the present invention;

FIG. 5 is a block diagram of the structure of TS code stream data of the present invention;

detailed description of the invention

The invention is described in further detail below with reference to examples and figures:

FIG. 1 is a schematic structural diagram of a ZYNQ-7000 chip-based real-time video and serial data wireless transmission system. The system comprises a real-time video and serial data wireless transmitting system (1) and a real-time video and serial data wireless receiving system (2).

Fig. 2 is a structural block diagram of a wireless transmission system for real-time video and serial data based on a ZYNQ-7000 chip, wherein after a system in an application is powered on, a ZYNQ-7000 module (9) reads a Linux system boot file from an SD card module (8) to complete the Linux system boot and the drive loading of each module, and at this time, a compression coding module (3) reads a firmware program from a flash (4) to complete the initialization of the modules; the drivers of the modulation transmitting module (10) and the receiving and demodulation module (16) adopt a dynamic loading mode, the drivers are compiled into dynamically loadable modules, loading can be completed according to requirements by using an insmod command, and unloading can be performed when the modules are not used, so that the volume of a linux inner core is not increased; the ZYNQ-7000 module (9) receives the TS code stream output by the compression coding module (3), simultaneously receives data input by the host device (5) from the serial port module (6), and fuses the received serial port data and the TS code stream to form a pseudo TS code stream; then the pseudo TS code stream is transmitted to a modulation transmitting module (10) through a USB interface, and an API of the modulation transmitting module (10) is called in a linux system of a ZYNQ-7000 module (9), so that the frequency band and the bandwidth of signal transmission can be configured; the signal is subjected to radio frequency channel selection, filtering and amplification processing through a radio frequency switch selection module (11), a filter module (12) and an amplifier module (13), and is finally transmitted through an antenna; the network port module (7) can be used for network communication and data transmission; the serial port module (6) can be used for transmitting data and debugging a system.

Fig. 3 is a block diagram showing a structure of a wireless receiving system for real-time video and serial data based on a ZYNQ-7000 chip, wherein a receiving demodulation module (16) is always in a receiving state; the radio frequency signal is received through an antenna, the received signal is amplified through a low noise amplifier module (14), clutter is filtered through a filter module (15), the radio frequency signal is processed into a pseudo TS code stream through a receiving demodulation module (16), the pseudo TS code stream is transmitted to a ZYNQ-7000 module (21) through a USB interface, the pseudo TS code stream is divided into a video TS stream and serial port data after being processed through the ZYNQ-7000 module (21), the video TS stream is transmitted to a decoding decompression module (22), and the serial port data is transmitted to a host device (17) through a serial port. The control interfaces of all modules and the peripheral interfaces of the system have the same connection mode and function as those of the transmitting system.

Fig. 4 shows a hardware connection block diagram for merging TS code stream data and serial port data, where the ZYNQ-7000 module (9) receives the TS code stream output by the compression coding module (3) and also receives the serial port data input by the host device (5) from the serial port module (6), and merges and encrypts the two data to form a pseudo TS stream. The TS video signal contains an 8-bit DATA signal DATA [7:0] and a 4-bit control signal. The CLK signal in the control signal is a clock signal of the TS code stream, and the clock is 27MHz according to a TS signal transmission protocol; the VALID signal is a VALID signal of the TS code stream and is used for distinguishing whether the length of the TS packet is 188Bytes or 204 Bytes; the SYNC signal is a synchronous signal, so that all signals are kept synchronous with the clock signal; the FAIL signal is a signal sent by the ZYNQ-7000 module (9) to the compression coding module (3), and when an error or packet loss occurs in TS packet sending, the FAIL signal is triggered. A serial port module (6) in the system adopts two signals of a TXD sending signal and an RXD receiving signal for transmission. The ZYNQ-7000 module (9) fuses the received serial port data into TS code stream data to form a pseudo TS code stream, and transmits the pseudo TS code stream to the modulation transmitting module (10) through USB differential data lines USB _ N and USB _ P.

Fig. 5 is a block diagram showing the structure of TS code stream data, the basic component unit of a TS stream is a TS packet with a length of 188bytes, a PID is a very important part of the TS stream, what is stored in the TS packet is determined by the PID, and serial data and video data can be classified by the PID. When the PID value is 0x04-0x0F or 0x16-0x1B, the meaning of the PID is not specified in the protocol, the invention can set the PID of the TS packet containing serial port data to the value in the TS packet by convention in advance, and the transmission priority of the TS packet containing serial port information is configured to be high. If the serial port data transmitted in real time is excessive, the serial port data is divided into a plurality of TS packets for transmission, and if the serial port data is less than one TS packet, 0xFF is used for filling. The fusion of the video data and the serial data is carried out through FIFO in a ZYNQ-7000 module (9), video TS stream is written into the FIFO according to packets, if the serial data is received, the serial data is used as payload, a TS stream packet header is added to the payload and packaged into a TS format, the transmission priority is configured to be high, the transmission priority is preferentially written into the FIFO, and thus the fusion process of the data is completed. The TS stream data analysis is mainly to check the PID of the TS packet, if the PID is the PID of the appointed serial port data, the TS packet data is extracted, and the TS packet data is sent to the serial port controller after the packet header is removed.

The invention realizes the wireless transmission of the TS format video signal, and the system is small and flexible through a wireless transmission mode; serial port data are fused into TS video signals, diversity of transmission contents is improved, and confidentiality of transmission is enhanced; according to the characteristic that any segment of TS can be decoded independently, the video of any segment received by intercepting is complete. The invention can be applied to video and data wireless transmission.

The invention has the characteristics of small volume, strong expandability and strong confidentiality.

The above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the embodiments of the invention or equivalent substitutions of parts of the technical features can be made without departing from the spirit of the technical solution of the invention, which is to be covered by the technical solution of the invention.

Claims (4)

1. A wireless transmission system for real-time video and serial data based on a ZYNQ-7000 chip is characterized in that the connection relation and the functions of related modules in the system are as follows:

the utility model provides a real-time video and serial ports data wireless transmission system based on ZYNQ-7000 chip divide into real-time video and the wireless transmitting system of serial ports data (1) and real-time video and the wireless receiving system of serial ports data (2), and its characterized in that system can also send and receive the serial ports data of host computer when carrying out video transmission, and its specific flow is as follows:

1.1 in a real-time video and serial data wireless transmitting system (1), a ZYNQ-7000 module (9) receives a TS code stream output by a compression coding module (3), simultaneously receives data input by a serial module (6) of a host device (5), and processes the received serial data and the TS code stream to form a pseudo TS code stream; the pseudo TS code stream is transmitted to a modulation transmitting module (10) through a USB interface for modulation, then radio frequency channel selection, filtering and amplification processing are carried out through a radio frequency switch selection module (11), a filter module (12) and an amplifier module (13), and finally the pseudo TS code stream is transmitted out through an antenna;

1.2 in the wireless receiving system (2) of real-time video and serial port data, the radio frequency signal received by the antenna is amplified by a low noise amplifier module (14), and clutter is filtered by a filter module (15); and the radio frequency signal is processed into a pseudo TS code stream by a receiving and demodulating module (16), the pseudo TS code stream is transmitted to a ZYNQ-7000 module (21) through a USB interface for analysis, the pseudo TS code stream is divided into a video TS stream and serial port data, the video TS stream is transmitted to a decoding and decompressing module (22), and the serial port data is transmitted to the host equipment (17) through a serial port module (18).

2. The ZYNQ-7000 chip-based real-time video and serial data wireless transmission system as claimed in claim 1, wherein the compression encoding module (3) and the decoding decompression module (22) perform the compression and decompression of the video data, and simultaneously, the ZYNQ-7000 modules (9, 21) are used to complete the fusion or parsing of the video data and the serial data.

3. The ZYNQ-7000 chip-based real-time video and serial data wireless transmission system as claimed in claim 1, wherein the drivers of the modulation transmitting module (10) and the demodulation receiving module (16) are both operated on the Zynq-7000 Linux system in a dynamic loading manner; the modulation transmitting module (10) can receive the video signal in the TS format or receive the control signal only through the USB interface, and control the transmitting frequency band and the bandwidth of the transmission signal.

4. The wireless transmission system of real-time video and serial data based on the ZYNQ-7000 chip as claimed in claim 1, wherein the method for fusing the video TS stream data and the serial data to form the pseudo TS stream data comprises: putting the video TS stream into FIFO of a ZYNQ-7000 module (9); and adding a packet header to the serial port information according to the format of the TS packet to convert the serial port information into TS code stream data, and then placing the TS code stream data into an FIFO (first in first out) so as to insert the serial port data into the video TS stream, wherein the video TS stream and the serial port data are analyzed and distinguished through the packet header.

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