Methods for enhancing the accuracy of environment measurements using a remote-access apparatus

摘要

A method for determining a value of an environment variable using raw data from an energetically essentially passive remote-access apparatus. A value of a first measurable quantity indicative of the environment variable is obtained from the raw data. The value of the environment variable is determined using calibration data and the value of the first measurable quantity. The accuracy is enhanced by measuring the value of the measurable quantity with a measuring signal of which strength is regulated or by obtaining a value of a second measurable quantity. The second measurable quantity is indicative of the environment variable or measurement conditions of the first measurable quantity. A method for forming calibration data for the measurements. RFID reader devices arranged to carry out the methods and energetically essentially passive remote-access apparatuses for the methods. A database that may be used with the method and a computer product including the database.

主权项

1. A method for determining the value of an environment temperature using an RFID reader and a transceiver, the transceiver being configured to draw energy from a field of the RFID reader, the method comprising:
sending an interrogation signal comprising a value of a frequency setting parameter from the RFID reader to the transceiver; obtaining a value of a first backscatter link frequency, the first backscatter link frequency being set by the transceiver; varying a value of a frequency setting parameter with the RFID reader; obtaining a value of a second backscatter link frequency, the second backscatter link frequency being set by the transceiver; using the values of the first backscatter link frequency and the second backscatter link frequency to obtain a value of a first measurable quantity, the first measurable quantity being indicative of the environment temperature; obtaining a value of a second measurable quantity, the second measurable quantity being a signal strength indicator indicative of the strength of the signal of the RFID reader; and determining the value of the environment temperature using calibration data, the value of the first measurable quantity, and the signal strength indicator.