In terms of video transmission of drones, high-as-1080P 30fps transmission is available, but this is not done in many domestic drone manufacturers. The general approach is to use analog map biography or WiFi map, and the simulation map is not good enough. WiFi map will have mosaic, easy to pause or kill. The performance of the image transmission system is a key factor distinguishes between drone grades. The distance of the image transmission distance, the quality of image transmission quality, the stability and real time of image transmission, etc. are key factors that measure the performance of the drone map.
COFDM (Coded Orthogonal Frequency Division Multiplexing) is an abbreviation of orthogonal frequency division multiplexing is the current world's most advanced and most developed modulation technology. Its practical value is to support the application of breakthrough line limits, is a well-utilized technology in terms of radio spectrum resources, which can have good immunity, diffraction, and penetration of the dust, the core of COFDM. . The basic principle is to convert high-speed data through a string and converted, allocated to a few subchannels with lower transmission rates. In terms of drone wireless image transmission, COFDM technology has strong error correction ability, "non-lateral / diffraction" transmission, high reliability, high speed movement, and unique advantages of small environmental impact, high transmission bandwidth.
SiHid COFDM HD Digital Wireless Graphics Development Suite Transmission distance is far, delayed, open design information, can help users better understand the COFDM HD digital wireless diagram system architecture, significantly reduce the development threshold for drone COFDM wireless diagram system development, It is conducive to users to quickly design high-cost COFDM map.
SiHid COFDM Wireless Titting Kit Introduction
The SiHid COFDM Wireless Graphics Development Kit uses COFDM modulation technology to complete high-definition digital wireless graphics feature, for user learning, evaluation, and test COFDM graphics technology, low delay video codec technology, etc. The development kit includes two parts of the transmitting end and the receiving end. The transmit terminal inputs a digital video signal via the HDMI interface. After the H.264 encodes compressed, the COFDM modulation (realistic baseband function) is configured, and then converted to the RF Transmitter after the DAC is converted to the RF Transmitter, the signal is transmitted through the PA (power amplifier) to the antenna. The SIHID COFDM Wireless Graphic Development Kit transmits includes SEM9363 encoding modulating boards and D-PA2400A power plague two boards. The receiving end includes the FC2400A down-variable frequency board and the COFDM Demodulator module, transmitting the demoded digital video signal to the mobile phone (or PC, tablet) to the mobile (or PC, tablet) for H.264 decompression playback by the USB interface.
SiHid COFDM Wireless Graphics Development Kit Features:
Working frequency: 2.400GHz ~ 2.483GHz
The transmitting end can be set to a single PA single antenna mode, or it can be set as a dual PA dual antenna.
Single PA transmit power: 23dBm (200MW), output power is adjustable
Work channels can be set in 8 channels
Channel bandwidth can be set: 6m or 8m
Modulation constellation can be set: QPSK or QAM16
COFDM Modulation Protection Interval: 1/4, 1/8, 1/16 (Default), 1/32
Transmitter video input: micro HDMI interface
Video compression format: H.264
Image definition: 1920x1080p @ 60, 1920x1080i @ 60 is compatible, adaptive input digital video source
Empty mouth rate: 4.3 ~ 31.7Mbps adjustable (default: 4.3 ~ 11.7Mbps)
The transmit terminal provides a TF card interface to support the edge recording transmission function.
The transmitting end provides an OSD interface
Transmitter provides control serial port
Support AES encryption
Transmit end supply voltage 5.5V ~ 16V, current 350mA @ 12V
Receive end sensitivity: 8MHz time -96 ± 1dBm, 6MHz -97 ± 1dBM
The receiving end provides a Micro USB interface (USB SLAVE) to perform H.264 decoding playback of the demodulated video access notebook \ tablet \ mobile phone.
Receive end supply voltage: 5V (powered via USB interface)
System delay: <200ms (decoded under Windows, input from the transmitted end HDMI to the receiving endows decoding display)
Transmission distance: 1 to 3 km
Support multi-point reception
Transmit terminal SEM9363 board provides debug serial port, JTAG commissioning port
Receive end FC2400A board provides debug serial port
SEM9363 encoding board (B version)
SiHID SEM9363 Wireless Digital Module Code Modulation Board Enter HD digital video to the HI3516A processor by HDMI interface to perform H.264 compression encoding, and the compressed video signal implements COFDM channel modulation through the FPGA, and then converted to analog signal modulation by the AD9363. For the convenience of users, the SEM9363 board B version will debug the serial port, the FPGA JTAG commissioning port, the OSD interface, the control serial port, and the power supply, etc., to J30 to the external interface of the D-PA2400A board.
SEM9363 board function block diagram:
SEM9363 board mechanical dimension:
The transmitting end coding modulation board SEM9363 uses Hi3516A to do H.264 encoding, support 1080P @ 60,1080i @ 60 video coding, using Xilinx Spartan6 FPGA to do a baseband, using ADI AD9363BBCZ to do RF. AD9363BBCZ supports 650M to 2.7GHz frequency range, and other AD936X devices are compatible with the AD9363BBCZ PIN to PIN (see Table below for the frequency bands supported by each device). Therefore, based on the design of the development kit, other operating frequency bands and transmit power can be supported as long as the appropriate AD936X is used and the PA power is enlarged. The corresponding receiving end only needs to change the circuit design of the inverter.
D-PA2400A Power Plate
The D-PA2400A power platen contains two separate RF power amplification modules, and the radio frequency signal output from the SEM9363A is output. Performance amplification module work indicators on the D-PA2400A board:
Working frequency: 2.400GHz ~ 2.483GHz
Gain: 34 ± 1dB
Pout1db: 31dBM
The J3 interface of the D-PA2400A board is connected to the J30 interface of the SEM9363 board (B version), and the Hi3516A debugging serial port on the SEM9363 board, the FPGA JTAG commissioning port, the OSD interface, the control serial port, the power supply, etc., the side of the D-PA2400A Outer interface. The two RF outputs of the SEM9363 board are connected to two RF input interfaces of the D-PA2400A board via the IPEX cable, respectively.
D-PA2400A board function block diagram:
D-PA2400A board mechanical dimension diagram:
FC2400A down-frequency board
The FC2400A down variable frequency board converts the received 2.4GHz RF signal to a 250MHz signal, and then the COFDM demodulation is converted into a digital signal through the channel demodulation module. Finally, the demoded digital video signal is transmitted to the mobile phone (or PC). ) Do H.264 decompression playback. The RF output of the FC2400A board is connected to the RF input of the COFDM Demodulator module via the RF line.
Working frequency: 2.400GHz ~ 2.483GHz
RF interface: SMA antenna interface
Receive sensitivity: 8MHz -96 ± 1dBm, 6MHz -97 ± 1dBM
8-bit parameter setting switch (receiving and demodulation parameter setting)
Micro USB Interface (USB SLAVE), performs H.264 decoding playback of devices after demodulated video access notebook \ tablet \ mobile phones.
Power supply voltage: 5V
Board size: 86mm x 31mm
FC2400A board function block diagram:
FC2400A board mechanical dimension:
SiHid COFDM Wireless Graphics Development Suite Software
SiHid COFDM Wireless Tuition Development Kit Shipment List
Sihid COFDM 2.4GHz 200MW Double Antenna Transmitter
Aluminum alloy shell
Built-in SEM9363 board
Built-in D-PA2400A board
2.4GHz launch antenna 2
Micro HDMI (Type D) cable 1 (for connecting an aerial camera)
OSD cable 1
1 control serial cable
Serial tested line 1
JTAG commissioning port 1
1 power cable
TF card 1 (built-in software and document, etc.)
FC2400A 2.4GHz receiving module
FC2400A board
Cofdm Demodulator Module
2.4GHz receives 1 antenna
USB cable 1
SWD debug line 1
Hardware design file
SEM9363 board circuit schematic (PDF format)
D-PA2400A board circuit schematic (PDF format)
FC2400A board circuit schematic (PDF format)
Hardware User Manual
FPGA pin function definition
Software
For details, please refer to the list of SiHid COFDM Wireless Graphics Development Kit Software Functions
Cross compiler
Software Development User Guide
Hi3516A serial port burning tool, COFDM DEMODULATOR module Windows driver installation file
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