Aerial photography drone market share declines in the first place "Daguan" status is not guaranteed?
In the third quarter of 2016, the top three manufacturers of China's aerial drone market were Dajiang, Zero Zhizhi, and Parrot, of which Dajiang occupied 52% of the market.
The report pointed out that this is the first time in four consecutive quarters that the market share of Dajiang has declined. At the same time, the small aerial drone represented by the zero-degree intelligent control pocket drone (according to IDC's definition, the aerial drone with a wheelbase less than 250mm is a small aerial drone) was the first batch in the third quarter. The large-scale shipments enabled the small aerial drones to quickly gain a 26% market share and further seize the market share of Dajiang.
Xiao Jing, research manager of IDC China's terminal system research department, pointed out: "The Dhan products series (Phantom) has become the most important sales product in the market of DJI and even China's aerial drones after four generations of products. With the release of the new Mavic portable drone, the market showed a wait-and-see attitude in the third quarter, which significantly reduced the shipments of the Phantom series."
However, the report also pointed out that the current product form and application scenarios of China's aerial drones are still relatively simple; technical bottlenecks such as battery life and product usability still exist, and the market size of aerial drones will not be presented in the short term. Explosive growth. DJI's rapid technological innovation, strong brand influence, and perfect sales service system will make DJI continue to maintain its absolute leading position in the aerial drone market. In the long run, through the further development of product differentiation, application innovation, industrial chain maturity, and policy perfection, the reform of China's aerial drone market will be inevitable.
IDC pointed out that by 2020, China's aerial drone market will grow rapidly with a compound annual growth rate of 86.5%. By then, the market will reach 5.76 million units, and the market size will reach 25 billion yuan, of which industry application shipments accounted for 33% and sales accounted for 49%.
IDC believes that IDC believes that this change will be reflected in the chip processor manufacturers to help the intelligent UAV, "Made in China" to promote the scale of the UAV market, user demand to promote the polarization of UAV products, industry applications to promote drones System platformization and other aspects.
With the differentiation of consumer and industry users in the demand for drone applications, traditional four-axis aerial drones will not be able to meet the specific needs of users. In the future, the miniaturization, portability and entertainment of drones will better meet the needs of mass consumers; the specialization, customization and systemization of drones will help industry users to promote the widespread use of drones. The polarization of the drone products will gradually become prominent.
In addition, the current UAV application has gradually expanded from a single film and television aerial photography to security, transportation and other fields. In addition to the changes in the use of the scene, the integration of drones with the original security and transportation information platforms and systems will become very important.
In addition to the UAV solution providers represented by DJI, which are more suitable for sub-segment products, video security-centric security solutions such as Hikvision and Zhejiang Dahua are also launched in 2016. UAV industry solutions.
IDC believes that such industry solution providers will be able to more easily implement the system platform of the drone with its image acquisition and transmission, information processing and storage, system stability and security built in the industry system.
- The Description of 3G 4G LTE/5G Antenna
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This paper discusses the key technologies in 3G/4G/5G (third generation/fourth generation/fifth generation) communication systems, and then discusses the differences in the antenna technologies adopted by them. After reading and studying a large number of papers on the key technologies of 3G/4G/5G communication system, here I make some analysis and summary of my own. With the rapid development of science and technology, mobile communication technology has undergone profound changes, from 1G to 2G, to 3G, and then to 4G and 5G. On December 4, 2013, the fourth generation of mobile communication 4G technology was officially operated in the Chinese market, which means that China's mobile communication industry has entered the 4G era. At this time, research institutes in various countries and world-renowned enterprises engaged in communication technology research have entered the research and development of the new generation of mobile communications, namely 5G (fifth generation mobile communication system). No matter which generation of communication system, the research technology is to analyze the characteristics of wireless communication channel to overcome the noise interference. A lot of researchers are now looking at Massive MIMO technology. How is it different from the antenna technology used in 3G/4G communication systems? Will it become the core technology of the next generation of wireless communications? 1 Key technologies of 3G/4G/5G Communication System 1.1 Key technologies of 3G Communication System Since the early 1990s, the mobile communication industry began to actively study the standards and technologies of the third generation of mobile communication. In January 2009, China's Ministry of Industry and Information Technology issued 3G licenses to China Mobile, China Telecom and China Unicom, indicating that China entered the ERA of 3G mobile communications. The third generation mobile communication system mainly includes WCDMA, CD-MA2000 and TD-SCDMA. Its key technologies include: A. Rake receiving technology; B. Channel coding and decoding technology; C. Power control technology; D. Multi-user detection technology; E. Smart antenna; F. Software radio. 1.2 Key technologies of 4G Communication System In December 2013, China officially entered the era of 4G (fourth generation mobile communication system) communication network. In 4G mobile communication system, OFDM(Orthogonal frequency Division multiplexing) technology is adopted. OFDM technology is due to its spectrum utilization
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It is widely regarded as high rate of 2 and good anti-multipath fading performance. In the future, RESEARCH related to OFDM technology will also be carried out in 5G communication networks. The main key technologies of 4G communication system include: a. OFDM technology; B. MIMO technology; C. Multi-user detection technology; D. Software radio; E. Smart antenna technology; F. IPv6 technology. China's Ministry of Industry and Information Technology has just issued 4G licenses to the three major operators, and they are still deploying their networks on a large scale with a small number of users. At this time, China Mobile said it will start the RESEARCH and development of 5G communication system. Analysts pointed out that the three major operators are participating in THE RESEARCH and development of 5G, one is to keep up with the changes of The Times, and the other is that the demand is faster than the technology development. Li Zhengmao, vice-president of China Mobile, said at the 2014 MWC in Barcelona: "China Mobile will fully support the development of 5G projects, hoping to lead the industry in THE development of 5G technology and the setting of technical standards." With the deepening of mobile communication technology research, the key support technologies of 5G will be gradually defined and enter the substantive standardization research and formulation stage in the next few years. The jury is still out on what core technologies will be used in the future. However, I have compiled a list of nine key technologies that have been the focus of discussion in various high-end mobile forums. A. Large-scale MIMO technology; B. Filter bank based multi-carrier technology; C. Full duplex technology; D. Ultra-dense heterogeneous network technology; E. Self-organizing network technology; F. Use of high frequency band; G. Software-defined wireless networks; H. Wireless access technology: (1) BDMA (Beam Split multiple Access technology)
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3 (2) NOMA (Non-orthogonal multiple Access technology) i. D2D (device-to-device) communication. Figure 1 is the layout of Massive MIMO antennas in 5G communication networks. I am studying Massive MIMO technology in my lab. Figure 1 shows users communicating with each other centered on a large-scale antenna. The performance of wireless communication systems is mainly restricted by mobile wireless channels. Wireless channel is very complex, and its modeling has always been a difficult point in system design. Generally, statistics are made according to the measured values of communication systems in specific frequency bands. Wireless fading channel is divided into large scale fading channel model and small scale fading channel model. The so-called large-scale fading model describes the field intensity variation over a long distance (hundreds or thousands of meters) between the transmitter and receiver, and reflects the rule that the received signal power changes with the distance caused by path loss and shadow effect. A small scale fading model describes the rapid fluctuations of the received field intensity over a short distance or time. The large scale fading channel model is caused by the influence of the surface contour (such as mountains, forests, buildings, etc.) between the receiver and the source. The small-scale fading channel model is caused by the multipath effect and doppler effect. If there are a large number of reflected paths but no LOS (direct signal) signal component, the small-scale fading is called Rayleigh fading, and the envelope of the received signal is described statistically by the Rayleigh probability density function. If LOS is present, the envelope is subject to Rician distribution. Multipath effect phenomena cause flat fading and frequency selective fading.
The Picture of 3G 4G LTE/5G Antenna
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