Abstract: A ranging method and an apparatus are provided. The ranging method is applied to a first communication apparatus, and the first communication apparatus includes a first ultra-wideband system and a first narrowband system. The ranging method includes: The first ultra-wideband system receives ranging configuration information from the first narrowband system, where the ranging configuration information is determined by the first narrowband system and a second narrowband system of a second communication apparatus through negotiation (S310); and the first ultra-wideband system generates a first ranging frame based on the ranging configuration information, where the first ranging frame is used to measure a distance between the first communication apparatus and the second communication apparatus (S320). This can implement a process of ranging between the first communication apparatus and the second communication apparatus in a more secure manner.

Abstract: A secure ranging method and an apparatus are provided. The method includes: a receiving-end device and a transmitting-end device obtain a session key through a narrowband system. The devices of both parties further generate secure CTSs in a symmetric manner based on the session key in combination with CTS configuration information, and perform inter-device ranging in a UWB system by using the CTSs. According to this application, the CTS can be flexibly configured based on the CTS configuration information, to improve secure ranging performance. In addition, the narrowband system replaces the UWB system to perform key-related information negotiation, and ranging is performed in the UWB system, so that high-accuracy ranging is implemented while low power consumption is considered.