GPS augmentation using time offset code modulation
First Claim
1. A method of identifying a pseudo random noise code signal comprising:
- transmitting a pseudo random noise code signal including a time offset;
receiving said pseudo random noise code signal;
searching for said pseudo random noise code signals wherein said search is based on said time offset; and
identifying said pseudo random noise code signal by matching the received pseudo random noise code signal to a stored pseudo random noise signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A positioning system incorporating a time offset into the pseudo random noise codes. Incorporating the time offset, a transmitter from a pseudo satellite sends pseudo random noise codes to a receiver which recognizes the pseudo random noise codes with the offset. The offset is typically done as one or more hours. Knowing the offset value, the receiver then acquires the signal, and uses it to determine position, distance, etc. The use of an offset allows conventional receivers to ignore the time offset signal by selecting a time offset value which is greater than the searching time allowed in the conventional receiver. Equipment capable of recognizing the time offset signal is capable of thereby ignoring and/or distinguishing incoming signals from other sources.
10 Citations
13 Claims
-
1. A method of identifying a pseudo random noise code signal comprising:
-
transmitting a pseudo random noise code signal including a time offset;
receiving said pseudo random noise code signal;
searching for said pseudo random noise code signals wherein said search is based on said time offset; and
identifying said pseudo random noise code signal by matching the received pseudo random noise code signal to a stored pseudo random noise signal. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method of utilizing pseudo random noise code signals generated by pseudo satellites, the method comprising:
-
transmitting a pseudo random noise code signal from a pseudo satellite wherein said pseudo random noise code signal includes a time offset;
searching for any pseudo random noise code signal for less time than said time offset. - View Dependent Claims (8, 9, 10, 11, 12)
-
-
13. A method of processing pseudo random noise code signals which are generated by pseudo satellites, the method comprising the steps of:
-
receiving a time offset pseudo random noise code signal;
performing a search for said time offset pseudo random noise code signal, wherein said search is based on a time offset of said time offset pseudo random noise code signal;
identifying said time offset pseudo random noise code signal by matching the received time offset pseudo random noise code signal to a stored pseudo random noise signal.
-
Specification