Transponder signals modulating method, involves representing two bit values of data bit as chirp signals having rising or falling frequency, where carrier signal is modulated with chirp signals using amplitude modulation

摘要

The method involves representing two bit values of a data bit as chirp signals having rising or falling frequency. A carrier signal is modulated with the chirp signals using amplitude modulation. The chirp signals are formed of sinusoidal signals having continuously variable frequency. The chirp signals are also formed of rectangular signals having continuously variable frequency. Independent claims are also included for the following: (1) a method for evaluating transponder signals (2) a transponder system consisting of a base station.