1. A method of processing satellite positioning system signals, comprising:
receiving assistance data at a mobile receiver from a first wireless cellular network using a wireless cellular transceiver;
obtaining a time synchronization signal from a second wireless cellular network at said mobile receiver using a wireless cellular receiver;
determining a time offset in response to said time synchronization signal, wherein the time offset is based on a signal propagation delay between the second wireless cellular network and the mobile receiver;
processing satellite signals at said mobile receiver using said assistance data and said time offset.
2. The method of claim 1, wherein said step of processing comprises:
obtaining expected pseudorange data in response to said assistance data;
determining expected code delay windows using said expected pseudorange data and a sub-millisecond portion of said time offset; and
correlating said satellite signals in response to said expected code delay windows to produce correlation results.
3. The method of claim 2, further comprising:
coherently averaging said correlation results in response to said time offset to synchronize to navigation data bits.
4. The method of claim 2, further comprising:
computing pseudoranges in response to said correlation results.
5. The method of claim 4, further comprising:
sending said pseudoranges to a server using said first wireless cellular network and said wireless cellular transceiver; and
locating position of said mobile receiver at said server in response to said pseudoranges.
6. The method of claim 4, further comprising:
processing satellite trajectory data within said mobile receiver using an absolute portion of said time offset to produce satellite position data; and
locating position of said mobile receiver in response to said pseudoranges and said satellite position data.
7. The method of claim 1, wherein said first wireless cellular network comprises a non-synchronized cellular network and said second wireless cellular network comprises a synchronized cellular network.
8. The method of claim 1, wherein said time synchronization signal is obtained without a subscription to said wireless network.
9. A mobile receiver, comprising:
a wireless cellular transceiver for communicating with a first cellular network;
a cellular acquisition receiver for receiving a time synchronization signal from a second wireless cellular network;
a satellite signal receiver for receiving satellite signals from satellite positioning system satellites;
a local clock in communication with said satellite signal receiver; and
a processor for determining a time offset between local time output by said local clock and satellite time output by said satellite positioning system satellites in response to said time synchronization signal, wherein the time offset is based on a signal propagation delay between the second wireless cellular network and the mobile receiver.
10. The mobile receiver of claim 9, wherein said processor is further configured to determine expected code delay windows using a sub-millisecond portion of said time offset and expected pseudorange data obtained via said wireless cellular transceiver.
11. The mobile receiver of claim 10, further comprising:
correlator circuitry for correlating said satellite signals in response to said expected code delay windows to produce correlation results.
12. The mobile receiver of claim 11, wherein said correlator circuitry is configured to coherently average said correlation results in response to said time offset to synchronize to navigation data bits.
13. The apparatus of claim 11, wherein said processor is further configured to computer pseudoranges in response to said correlation results.
14. The apparatus of claim 13, wherein said processor is further configured to process satellite trajectory data using an absolute portion of said time offset to produce satellite position data, and locate position of said mobile receiver in response to said pseudoranges and said satellite position data.
15. The apparatus of claim 9, wherein said first wireless cellular network comprises a non-synchronized cellular network and said second wireless cellular network comprises a synchronized cellular network.
16. The apparatus of claim 9, wherein said cellular acquisition receiver is configured to obtain said time synchronization signal without a subscription to said second wireless cellular network.
17. A position location system, comprising:
a server for providing assistance data;
a mobile receiver, including:
a wireless cellular transceiver for communication with said server through a first wireless cellular network;
a cellular acquisition receiver for receiving a time synchronization signal from a ground based transmitter of a second cellular network;
a satellite signal receiver for receiving satellite signals from satellite positions system satellites;
a local clock in communication with said satellite signal receiver; and
a processor for determining a time offset between local time output by said local clock and satellite time output by said satellite positioning system satellites in response to said time synchronization signal, wherein the time offset is based on a signal propagation delay between the second wireless cellular network and the mobile receiver.
18. The system of claim 17, wherein said first wireless cellular network comprises a non-synchronized cellular network and said second wireless cellular network comprises a synchronized cellular network.
19. The mobile receiver of claim 9, wherein the mobile receiver is operable to receive CDMA signals.
20. The method of claim 1, further comprising:
receiving long term satellite trajectory model from the first wireless network.
21. The method of claim 20, wherein the long term satellite trajectory model from the first wireless network is valid for longer than ephemeris data.
22. The method of claim 1, wherein determining a time offset further comprises measuring the round trip delay for a signal being transmitted from the base station to the mobile station.
23. The method of claim 1, wherein obtaining a time synchronization signal further comprises obtaining a time synchronization signal from a ground based transmitter of a second wireless cellular network at said mobile receiver.
24. The mobile receiver of claim 9, wherein the cellular acquisition receiver for receiving a time synchronization signal receive the time synchronization signal from a ground based transmitter of a second wireless cellular network.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A catalytic combustor formed of a plurality of flat strips and corrugated strips arranged to form a stack, the stack having an end face, the flat and corrugated strips defining a direction of fluid flow along corrugations of said corrugated strips, the combustor comprising a plurality of pairs of flat and corrugated strips, the flat and corrugated strips of each pair being welded together, wherein the flat strip of each pair is offset, in a direction generally parallel to said direction of fluid flow, relative to the corrugated strip of each pair, wherein said pairs are arranged in said stack such that alternate pairs have a flat strip offset towards said end face, and remaining pairs have a corrugated strip offset towards said end face, wherein said pairs are welded together to form a unitary structure.
2. The combustor of claim 1, wherein a flat strip of each pair is welded to a corrugated strip of an adjacent pair.
3. A catalytic combustor comprising a plurality of flat strips, a plurality of high-amplitude corrugated strips, and a plurality of low-amplitude corrugated strips, wherein the flat strips are arranged in a stack such that the flat strips alternate with high-amplitude corrugated strips, the flat and corrugated strips defining a direction of fluid flow along corrugations of said corrugated strips, and wherein a space between the flat strips also contains at least one low-amplitude corrugated strip, wherein the low-amplitude corrugated strip is recessed relative to ends of the flat strips, in a direction generally parallel to said direction of fluid flow, and wherein the flat strips and the high-amplitude corrugated strips are welded together at ends of the flat strips.
4. A catalytic combustor comprising a plurality of metal strips assembled into a stack, wherein some of the strips are flat and some are corrugated, wherein the stack has end faces, the flat and corrugated strips defining a direction of fluid flow along corrugations of said corrugated strips, wherein some of the flat or corrugated strips are displaced relative to others of the flat or corrugated strips, in a direction generally parallel to said direction of fluid flow, such that some of the strips do not terminate at the end faces, wherein the strips are welded together to form a unitary structure.
5. The catalytic combustor of claim 4, wherein the flat strips alternate with the corrugated strips in the stack, and wherein flat strips and corrugated strips are alternately displaced in the stack.
6. The catalytic combustor of claim 4, wherein some of the corrugated strips have low-amplitude corrugations and some of the corrugated strips have high-amplitude corrugations, and wherein the low-amplitude corrugated strips are displaced such that the low-amplitude corrugated strips do not terminate at the end faces.