Time of arrival delay cancellations
First Claim
1. A transponder of a ranging system, comprising:
- a signal receiver for receiving a challenge signal and a ranging signal from an interrogator, the ranging signal sent from the interrogator a time interval after the challenge signal;
a signal processor for processing the challenge signal, generating a response signal in response to the challenge signal and storing the response signal; and
a signal transmitter for sending the stored response signal in response to the ranging signal from the interrogator.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to a ranging system for measuring the distance between an interrogator and a transponder. The transponder includes: a signal receiver for receiving a challenge signal from an interrogator; a signal processor for processing the challenge signal and generating a response signal in response to the challenge signal; a buffer for storing the response signal generated by the signal processor; and a signal transmitter for sending the response signal stored in the buffer when the signal processor receives a ranging signal from the interrogator, wherein a time interval between the challenge signal and the ranging signal is known to both transponder and the interrogator.
-
Citations
31 Claims
-
1. A transponder of a ranging system, comprising:
-
a signal receiver for receiving a challenge signal and a ranging signal from an interrogator, the ranging signal sent from the interrogator a time interval after the challenge signal; a signal processor for processing the challenge signal, generating a response signal in response to the challenge signal and storing the response signal; and a signal transmitter for sending the stored response signal in response to the ranging signal from the interrogator. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An interrogator of a ranging system, comprising:
-
a signal transmitter for sending a challenge signal and, after a time interval, sending a ranging signal to a transponder; a signal receiver for receiving a response signal from the transponder, the responsible signal being calculable to both the interrogator and the transponder; and a signal processor for determining a time of flight based on the ranging and response signals to thereby calculate a distance between the interrogator and the transponder. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A ranging system, comprising:
-
an interrogator for sending a challenge signal and, after a time interval, sending a ranging signal; and a transponder for receiving the challenge signal and the ranging signal, processing the challenge signal, generating a response signal in response to the challenge signal, storing the response signal and, in response to the ranging signal, sending the response signal to the interrogator, wherein the interrogator is adapted to determine a time of flight based on the ranging and response signals to thereby calculate a distance between the interrogator and the transponder. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
-
-
24. A method for operating a ranging system, comprising:
-
causing a transponder to receive a challenge signal from an interrogator, to generate a response signal in response to the challenge signal and store the response signal; causing the transponder to receive a ranging signal from the interrogator, the ranging signal transmitted from the interrogator after a lapse of a time interval from transmitting the challenging signal; and causing the transponder to send the stored response signal to the interrogator in response to the ranging signal. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
-
Specification