Sheet Metal · 2022年10月12日

4G technology leads the in-vehicle wireless monitoring industry to continue to move forward

In addition to the government’s promotion of the rapid growth of the on-board surveillance market, the development of new technologies has played a vital role in it. On-board monitoring systems involve related technologies in multiple fields and industries, such as electronics, communications, computers, and control. With the continuous development and maturity of these technologies, the specifications of on-board monitoring systems will inevitably increase. At present, the emergence of 4G transmission technology, It can be said that it has brought a new revolution to vehicle monitoring.

As we all know, the vehicle is always in a mobile state when working, unable to connect the cable to transmit the monitoring data to the monitoring center, and the supervisors cannot understand the data and the condition of the vehicle in real time. Provide timely feedback and stop the violations of laws and regulations that are occurring. In addition, because the monitoring point and the data storage point are in the same place; data is often damaged after an accident, and the role of video forensics is not brought into play. In order to solve this problem, some professional car manufacturers have tried to transmit data in real time through the GPRS network. However, because the amount of real-time monitoring data generated in real time is very large, it is impossible to achieve high-definition coherent transmission, so the application of car monitoring is subject to certain restrictions. Hinder.

In the face of such a dilemma, the emergence of 3G transmission technology provides an important opportunity to solve this problem. At present, the actual transmission rate of the 3G network has been able to achieve 4 channels of CIF, each channel of 13-15 frames clear and smooth video transmission. The car video recorder can also carry out D1 high-definition video while transmitting low bit stream, which realizes the efficient combination of local high-definition video and remote wireless real-time monitoring, making the practicality of vehicle monitoring reach a new height. At the same time, through the application of 3G, on-board monitoring can realize real-time monitoring and storage in the remote monitoring center based on audio and video transmission. At the same time, it also expands other more application functions, such as remote alarm function, abnormal vehicle driving state alarm, and wireless voice function. Wait.

But judging from the current development, 3G wireless video surveillance technology has also encountered market bottlenecks.

The bandwidth and frequency resources of wireless networks are more limited. Since the effective bandwidth of a single terminal of a public mobile communication network is quite limited, it is often necessary to carry voice, data and other transmission services at the same time. Even if the current 3G network is used to transmit CIF images, a base station cannot exceed 3 monitoring points, and the characteristic of wireless broadband is the uncertainty of the bandwidth during transmission. If the current 3G network is fast, it can reach 1M, and there are dozens of slow speeds. Therefore, it can only be used as an auxiliary transmission method; the bit error rate of the wireless channel is relatively high, especially when the terminal device is in a mobile state, the available bandwidth and bit error rate indicators have a large decline, and the available bandwidth often fluctuates. Bandwidth video surveillance data is prone to packet loss and low reliability; wireless transmission is far more expensive than wired transmission. Generally speaking, wired transmission is more cost-effective than wireless transmission, especially broadband transmission. The operating cost of the 3G wireless video surveillance system includes broadband Internet access fees for video sources, mobile phone viewing traffic fees, monitoring system operating fees, etc. The total operating costs are relatively high, and it is difficult to reduce; public communication systems that share channel resources, in emergency situations When the local load increases rapidly, it may cause intolerable delay or even congestion.

At the end of 2013, the Ministry of Industry and Information Technology issued a 4G license. 4G technology is a brand-new concept in communication technology. It integrates 3G and WLAN technology, can transmit video images with high quality, and the image transmission quality can reach the level of high-definition TV picture quality. The download speed of 4G technology can reach 100Mbps, and the upload speed can also reach 20Mbps, which is about 10 times faster than the current dial-up Internet method. It can provide a more stable and high-speed wireless mobile network, the theoretical download peak can reach about 100 megabytes per second, and it may only take a few minutes to transmit a video surveillance file. 4G technology can easily meet the bandwidth requirements of high-definition wireless video surveillance

In addition, 4G networks may bring new breakthroughs in terms of stability and cost. According to industry insiders, the impact of 4G networks on wireless high-definition surveillance is obvious. If the 4G network can solve the problems of stability, traffic cost, etc., the impact on high-definition surveillance will be revolutionary. At that time, the 4G network will drive the high-definition wireless video surveillance industry to make great strides forward.

In the long run, 4G has many bright prospects and will bring exciting applications, but the overall application is currently affected by tariffs and operator networks. If major operators can participate in the construction of 4G wireless networks , As soon as possible to improve the signal coverage of various regions and simultaneously reduce network tariffs, the market prospects of 4G car wireless hard disk video recorders will be very good by then.

For a long time, transportation vehicles have been a potential big market for monitoring systems, but due to various reasons such as cost, the installation and utilization rate of vehicles is not high. In the past two years, government departments have increased their supervision of vehicle operation safety, and the introduction of relevant policies has detonated a huge potential market. Driven by the policy, many provinces and cities such as Beijing, Hebei, Jiangsu, Shanghai, Guangdong and other provinces and cities have carried out renovation work on passenger vehicles and strengthened the application of video surveillance. Other places, such as Hanzhong City in Shaanxi Province, also stipulate that all tourist buses, sleeper buses, and inter-provincial and inter-city line buses must be equipped with on-board video surveillance equipment. Those that are not installed as required will not be allowed to continue to participate in the operation. With the development of society in recent years and the government’s continuous investment and promotion of public transportation, the number of passenger vehicles continues to grow at a high speed. These are potential on-board monitoring needs.

In terms of school buses, as the development of school buses has been included in the government’s important agenda, the security application of school buses should not be underestimated. It is understood that the potential demand for professional school buses in China is about 1 million, and the potential market demand is 400 billion yuan. With the gradual advancement of school buses, the development of some auxiliary equipment will be correspondingly promoted, such as safety positioning, safety monitoring and other equipment will be optimistic about the market demand and prospects with the advancement of school buses.

At the same time, the construction of the safe city is currently in full swing, and investment is continuously increasing; the continuous improvement of the operator’s network and the intervention of the operator with the advantages of platform and funds will bring huge opportunities for the development of on-board monitoring. In addition, the on-board monitoring system belongs to the branch of the intelligent transportation system, and occupies an extremely important position in the huge system of the intelligent transportation system. During the “Twelfth Five-Year Plan” period, the state has issued a plan for the development of intelligent transportation. Driven by the rapid development of intelligent transportation, on-board monitoring will have greater applications and improvements.

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