Location system

摘要

A receiver for receiving a signal, the signal conforming to a protocol such that the signal comprises a synchronising portion and a data portion, each portion comprising pulses located in respective time slots, the time offsets between successive time slots being defined by the protocol, the receiver comprising: a detector configured to detect a first pulse and a second pulse of the synchronising portion; a comparison module configured to compare the time offset between the first and second pulses to a corresponding time offset defined by the protocol so as to determine the relationship between the detected time offset and the corresponding time offset; a determination module configured to determine expected times of arrival of the time slots of the data portion using the determined relationship and the time offsets defined by the protocol; and a data reader configured to read data conveyed in the data portion at the expected times of arrival.

主权项

1. A receiver for receiving a signal, the signal conforming to a protocol such that
the signal comprises a synchronising portion and a data portion, each portion comprising pulses located in respective time slots, the time offsets between successive time slots being defined by the protocol, the receiver comprising:
a replica pulse generator configured to generate first and second replica series of pulses, each pulse offset from the next by a time e, and each series being offset from the next by a time f, where f is not an integer multiple of e;a mixer configured to mix the replica series with the received signal and output the mixed signal to a detector;the detector configured to detect a first pulse and a second pulse of the synchronising portion, the detector being configured to detect a pulse of the received signal if that pulse is input to the mixer coincident with a pulse of the replica series;a comparison module configured to compare the time offset between the first and second pulses to a corresponding time offset defined by the protocol so as to determine the relationship between the detected time offset and the corresponding time offset;a determination module configured to determine expected times of arrival of the time slots of the data portion using the determined relationship and the time offsets defined by the protocol; anda data reader configured to read data conveyed in the data portion at the expected times of arrival.