Car mounted sensor network is a new type of mobile, vehicle based sensor network built on the basis of car mounted self-organizing network. The network formed by self-organizing wireless sensor nodes installed on mobile vehicles is called Vehicle Sensor Network (VSN), which can achieve communication between V2V and V2I.
In the in vehicle sensor network, vehicles are equipped with wireless in vehicle units (OBUs), which use short distance wireless communication technology to communicate with other vehicles and can also communicate with roadside units (RSUs).
The various sensors on the vehicle can not only collect, perceive, and calculate factors such as road traffic or climate around the vehicle nodes, but also perceive the internal state of the vehicle through some sensors inside the vehicle. These sensors play a significant role in their respective functions based on their different usage scenarios. For example, a driving recorder that can capture video footage and dynamic and static image information near a vehicle.
The application of wireless communication technology will become increasingly widespread
An accelerometer that can provide real-time acceleration information during vehicle movement; A driving gyroscope that can sensitively sense the direction of vehicle travel; GPS, a global satellite positioning system terminal device that can accurately locate the geographic location of vehicles and calculate their real-time speed of travel; An onboard environmental sensor capable of detecting vehicle temperature and humidity; Even in car biosensors that can perceive the driver's physiological and psychological conditions.
Wireless communication technology is the foundation for the implementation of intelligent connected vehicles, which directly determines the real-time and effective information exchange. The wireless communication technologies used for intelligent connected vehicles include short distance wireless communication technology and long-distance wireless communication technology. Wireless communication is a communication method that utilizes the characteristics of electromagnetic wave signals that can radiate and propagate in free space for information exchange. It can transmit data, images, audio, video, etc.
Wireless communication systems generally consist of transmitting devices, transmission media, and receiving devices, where the transmission medium is electromagnetic waves. Antennas need to be installed on the transmitting and receiving devices to complete the transmission and reception of electromagnetic waves.
The transmitting device converts the original signal source into a signal suitable for transmission on a given transmission medium, including modulation, frequency conversion, power amplification, etc. The modulator adds low-frequency signals to high-frequency carrier signals, and the frequency converter further converts the signal into the frequency required for transmitting radio waves (such as shortwave frequency, microwave frequency, etc.). After amplification by a power amplifier, it is transmitted through an antenna.
The receiving device restores the received signal to its original information and sends it to the receiving end. The receiving device amplifies the RF carrier signal received by the antenna, converts it to frequency, and finally demodulates it to recover the original information, completing wireless communication.
