The wide application of drones in many fields has brought great convenience to many industries such as people's livelihood, scientific research, and commerce. Usually, when one person controls a drone to complete work, it seems simple, and the drone can complete these. The work mainly includes three parts: flight control system, pan/tilt+camera, and wireless image transmission system, especially the wireless image transmission system, which is called “acting as a drone eyeâ€. Vision Crystal will take everyone to understand how to implement wireless image transmission in drone design.
Application of drone in electric power inspection
2.4GHz full HD UAV map transmission system is the mainstream
In the video transmission of drones, the high-profile wireless image transmission system can achieve 5km/1080P 30fps transmission, but this is what many domestic entertainment drone manufacturers have not yet done. The general practice is to carry a camera on the PTZ, fly at high altitude and fly back to the ground for inspection. This method cannot meet the requirements of aerial photography because the picture cannot be seen immediately.
UAV remote control / HD map transmission block diagram
The core device of the drone image transmission system - 2.4GHz transmitter
The 2.4 GHz transmitter is the core component of the UAV graphics transmission system. Although the 433MHz band has strong penetrability and long communication distance, it can transmit up to 2 kilometers, but due to its weak anti-interference ability, it is not used in remote drones or aircraft. At present, professional WiFi chip manufacturers (including Broadcom and Qualcomm) have not developed such a chip for long-distance wireless high-definition video transmission. But the drone market is so hot, wireless chip makers are already planning to launch dedicated chips. In the future we may see a dual-mode chipset that can establish links to both the controller and the display.
CVW drone image transmission products
But before the introduction of dedicated chips, RF engineers can implement long-distance, high-bandwidth wireless video transmission through discrete devices. 2.4GHz transmitter ICs for use on drones must have high receive sensitivity, low power consumption, small size, and a variety of advanced channel management capabilities. Cypress's Cypress 2.4-GHz single-chip radio transceiver Wireless USB has been used in drones and has been successfully used in both control signal transmission and video transmission. Cypress's latest fourth-generation Wireless USB NX transceiver not only inherits the consistently ultra-low power performance characteristics, but its 2Mbps data rate minimizes transmission and reception times. In the 2.4 GHz ISM band, it offers higher integration and best price/performance ratio compared to competitors.
Of course, the choice of plates for use with 2.4 GHz transceivers is also very important. "RF circuit design has always been a difficult point in system design. In addition to RF transceivers that require high receiver sensitivity, professional high-performance microwave boards are required. Our Rogers high-performance microwave boards are particularly suitable for 2.4GHz. The transceiver is used in the image transmission system of the drone. High performance PA/LNA/
FILTER IC ensures long-distance transmission and anti-jamming In combination with 2.4GHz transmitter ICs, high-performance PA/LNA/FILTER ICs are also essential. The MGA-22003 linear power amplifier module is the key component to ensure long-distance image transmission, stable under any load or condition, and its 3x3 mm package is ideal for space-constrained applications.
The miniaturized bandpass filter ACFF-1024 designed for the 2.4GHz band is ideally suited for use in drone image transmission systems to remove external interference. It solves the problem of simultaneous operation of WiFi/Bluetooth and other wireless communication standards without affecting performance due to adjacent radio frequency interference.
Affordable, easy-to-use GaAs MMIC Low Noise Amplifier (LNA)
The MGA-64606 is also the preferred device for many drone products . It is enough to improve the overall received signal sensitivity of the drone map transmission system. “Yang Zhong pointed out.†The key is that it also has a switchable shutdown and bypass function so that it can be bypassed when the input signal power is high. This feature can reduce current consumption and extend the battery life of the device, which is very meaningful for drones. â€
The small footprint, small size, embedded power detection circuitry, power-off capability, and excellent power efficiency make the wireless local area network (WLAN) power amplifier MGA-412P8 ideal for mobile IEEE 802.11bg WLAN applications. It has a linear output power of 19.0 dBm at 3% EVM 54 Mbps data rate (OFDM modulation) and a linear output power of 23 dBm at 11 Mbps (CCCK modulation). In some 5.8GHz graphics transmission systems, such as MGA-675T6 LNA and MGA-25203 PA, it can fully meet the performance requirements.
The drone's requirements for power supply are very demanding. In addition to ensuring low power consumption and high efficiency, it must also have a high ripple rejection ratio in the drone image transmission system. Shiqiang's LDO voltage regulator is ideal for remote control applications at the receiving end of the drone, and Shiqiang can provide customers with a complete solution from power supply to battery protection to help customers select models.
On the other hand, since the application scenarios of the aircraft are generally outdoor, the customer is bound to do temperature compensation within the full temperature range. Currently, the crystal oscillator industry is leading the EPSON (Epson) high-precision temperature-compensated crystal oscillator (TCXO) technology. With an accuracy of up to 2ppm, it can fully meet the environmental requirements of the UAV working scene.
The above is the wireless map transmission manufacturer Vision Wireless for everyone to organize the UAV to achieve wireless map transmission and mainstream products, hoping to help visitors in need.
The optical module (optical module) is composed of optoelectronic devices, functional circuits and optical interfaces. The optoelectronic device includes two parts: transmitting and receiving.
Simply put, the function of the optical module is to convert the electrical signal into an optical signal at the transmitting end, and after transmitting through the optical fiber, the receiving end converts the optical signal into an electrical signal.
The optical module is an optoelectronic device that performs photoelectric and electro-optical conversion. The transmitting end of the optical module converts electrical signals into optical signals, and the receiving end converts optical signals into electrical signals. Optical modules are classified according to the packaging form. Common ones include SFP, SFP+, SFF, Gigabit Ethernet Interface Converter (GBIC), etc.
The transmitting part is: the electrical signal with a certain code rate is processed by the internal drive chip and then drives the semiconductor laser (LD) or light-emitting diode (LED) to emit the modulated light signal of the corresponding rate. The internal optical power automatic control circuit makes The output optical signal power remains stable.
The receiving part is: the optical signal of a certain code rate is input into the module and then converted into an electric signal by the light detection diode, and the electric signal of the corresponding code rate is output after the preamplifier.
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