Method for transceiving a message for UWB distance measurement, method and system for distance measurement and transceiver for UWB distance measurement

Method for distance measurement between a verifier and prover comprising the following steps:

• sending a first message with a first pulse sequence from the verifier to the prover;
• sending a second message with a second pulse sequence from the prover to the verifier;
• measuring the distance between the verifier and the prover based on a verifier time difference between sending the first message from the verifier and receiving the second message at the verifier;
• wherein the first message comprises a first information portion including synchronization information and a second information portion comprising the first pulse sequence, wherein the second information portion is transmitted after the first information portion, wherein the first information portion is transmitted via a narrowband channel and the second information portion is transmitted via a UWB channel, wherein the second information portion comprises a security pulse sequence for providing secure distance measurement, wherein the security pulse sequence is distinct from the distance pulse sequence, wherein the prover determines the time of arrival of the first message based on the distance pulse sequence, wherein the prover verifies the security of the time of arrival of the first message based on the following steps:
• determining an expected time of arrival of the security pulse sequence based on the time of arrival of the first message;
• decoding an UWB signal received in the UWB channel at the prover at the time of arrival of the security pulse sequence to obtain a decoded security bit sequence;
• comparing the decoded security bit sequence with an expected security bit sequence to verify the security of the time of arrival of the first message.

Device for transceiving a message for UWB distance measurement, comprising:

• a transceiver configured to transceive a first information portion via a narrowband channel and to transceive after the first information portion a second information portion via a UWB channel, wherein the second information portion comprises a distance pulse sequence for distance measurement,
• wherein the transceiver comprises a transceiving circuit configured to be operated in a narrowband mode and in a UWB mode, comprising:
• an oscillator configured to generate in the narrowband mode a first carrier signal for the narrowband channel as a carrier signal of the oscillator for the first information portion and in the UWB mode a second carrier signal for the UWB channel as the carrier signal of the oscillator for the second information portion, and
• a signal generator configured to modulate the carrier signal from the oscillator to generate a modulated radio signal, wherein the signal generator is configured in the narrowband mode to modulate the first information portion on the carrier signal received from the oscillator and in the UWB mode to modulate the second information portion on the carrier signal received from the oscillator, and
• a transmission amplifier configured to amplify the modulated radio signal.

System for distance measurement between a verifier and prover comprising the verifier and the prover, wherein the verifier is configured to send a first message with a first pulse sequence to the prover, wherein the prover is configured, after having received the first message, to send a second message with a second pulse sequence to the verifier, wherein the verifier is configured to measure the distance between the verifier and the prover based on the verifier time difference, wherein the verifier time difference is the time difference between sending the first message from the verifier and receiving the second message at the verifier;

• wherein each of the verifier and prover comprises a respective transceiver, wherein each transceiver is configured to:
• transceive a first information portion via a narrowband channel, and
• transceive after the first information portion a second information portion via a UWB channel, wherein the second information portion comprises the first or second pulse sequence for distance measurement,
• wherein each transceiver comprises a transceiving circuit configured to be operated in a narrowband mode and in a UWB mode. comprising:
• an analogue to digital converter configured to convert a received radio signal into a digital signal, wherein the analogue to digital converter uses in the narrowband mode a first sampling frequency and in the UWB mode a second sampling frequency, wherein the first sampling frequency is lower than the second sampling frequency, and
• a digital processor configured to process the digital signal to process the first information portion in the narrowband mode and to process the second information portion in the UWB mode.