METHOD FOR LOCATING TAG BY RADIO FREQUENCY IDENTIFYING READER AND RADIO FREQUENCY IDENTIFYING READER

摘要

The invention discloses a method for locating a tag by a radio frequency identifying reader and a radio frequency identifying reader. The method includes: A. the reader transmits signals to the tag on at least two frequencies and receives the corres - ponding reflection signal; B. the reader combines the received reflection signals and acquires the combined signal which is received, and maps the combined signal which is received to be a constellation point in a constellation map to locate the tag. The tag can be located better by using the method and the reader which the invention provides.