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Photo source: freelancer.com according to foreign media reports, apple is considering using iPhone or apple watch to provide keyless access to Apple cars. Compared with the current system based on key card, ultra wideband technology can make keyless access system more accurately determine the distance between users and vehicles. Photo source: appleinsider.com the patent is called "mobile device for communication and ranging with access control system for automatic functionality", which is a new version of keyless entry systems. The current system relies on a key card equipped with a radio transmitter. When the owner is in a certain range of the vehicle, the key card can communicate with the vehicle as an identity card, and can make the ignition device of the vehicle work at a short distance. Some of these systems use magnetic signals to do the same. Although the system has powerful functions, it is not accurate to use the signal strength of current technology to determine the distance of the key card, which usually requires a specific key card to complete the task. It is rumored that apple is proposing to use Bluetooth and ultra wideband technology to perform the same task in the redesigned system for Apple cars, which will be more accurate and practical. Photo source: appleinsider.com Bluetooth technology is generally used for data transmission between security devices and vehicle radio systems, including password key exchange during challenge response authentication. With Bluetooth technology, the system can also use smartphones such as iPhones or apple watches or other wearable devices to complete tasks, and passengers can carry such items with them at any time. According to the device and the exchanged key, the vehicle can allow users to have different privileges. For example, a child's apple watch can open the back door of the vehicle, but can't let him drive the car, even if the owner's apple watch can fully control the vehicle. The latest iPhone is equipped with ultra wideband technology, which enables airdrop sharing and other future applications. Compared with Bluetooth technology, it can determine the distance more accurately. With this technology, the vehicle can know how far the driver's or passenger's equipment is from the vehicle and trigger other distance related functions. If the driver's apple watch or iPhone is nearby, a vehicle in a certain range can open the door, but it will not let it start until the device actually enters the vehicle. In August 2018, apple applied for a patent for the enhanced automotive passive entry system, proposing to use magnetic antennas and RF antennas to determine the distance. Apple is also a franchised member of the car connectivity consortium, which developed the digital key version 1.0 specification in 2018, detailing how to use smartphones as digital keys for cars.