SOFTWARE DEFINED NAVIGATION SIGNAL GENERATOR

• US 20080074322A1
• Filed: 09/27/2006
• Published: 03/27/2008
• Est. Priority Date: 09/27/2006
• Status: Active Grant

• Current Assignee: BAE Systems Information and Electronic Systems Integration Incorporated (BAE Systems Plc)
• Original Assignee: BAE Systems Information and Electronic Systems Integration Incorporated (BAE Systems Plc)
• Inventors: Ryba, Martin F.
• Granted Patent: US 7,847,730 B2
• Time in Patent Office: Days
• US Class Current: 342/386
• CPC Class Codes: G01S 19/03 Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
• CPC Class Codes: G01S 19/10 providing dedicated supplementary positioning signals
• CPC Class Codes: G01S 19/11 wherein the cooperating elements are pseudolites or satellite radio beacon positioning system signal repeaters
• CPC Class Codes: G01S 5/0226 Transmitters

Abstract

A navigation signal generator on a framework that provides a standardized object-oriented means for developing and managing signal processing functions. The framework provides the ability to dynamically reallocate functions allowing numerous communications, signals intelligence, and information warfare missions that may be required under a single platform and co-exist with other frameworks. In one embodiment the system is a software defined navigation augmentation using the software defined radio architecture.

Claims

1. A system for software defined radio navigation, comprising:

a framework having a hardware independent interface and a hardware dependent interface and communicating with at least one bus;

a processing section coupled to said framework and processing a set of input navigation data into a set of processed navigation data,

wherein said processing section includes at least one software defined radio component, and wherein said component is hardware independent; and

a transmitter section coupled to said framework, transmitting said processed navigation data.

2. The system according to claim 1, further comprising a receiver section coupled to said framework, receiving said input navigation data.

3. The system according to claim 1, wherein said software defined radio component is selected from at least one of the group consisting of:

red side processor, infosec, and black side processor.

4. The system according to claim 1, wherein said system is a pseudolite.

5. The system according to claim 1, wherein each said component is comprised of a core application and a respective component virtual interface, wherein said core and said component virtual interface are hardware independent;

a target platform interface interacting with said component, wherein said target platform interface is hardware specific and binds said component to a Field Programmable Device (FPD), and wherein said target platform interface is coupled to said framework manager.

6. The system according to claim 1, further comprising a combiner, said combiner providing phase, frequency and time offset compensation.

7. The system according to claim 6, said combiner further providing at least one multipath.

8. A navigation signal generator, comprising:

a receiver section receiving a plurality of input navigation signals, said receiver section comprising a plurality of receiver antenna elements and a global navigational satellite system (GNSS) receiver section;

a processing section processing said input navigation signals, said processing section comprising a set of software defined radio processing elements and a combiner implemented in a field programmable device, said processing section generating a summed single output navigation signal; and

a transmitter section having a plurality of transmitter antenna elements for transmitting said output navigation signal.

9. The signal generator according to claims 8, wherein said transmitter antenna elements and said receiver antenna elements are the same.

10. The signal generator according to claims 8, wherein said processing section comprises at least one of the group consisting of:

MilGPS, navigation bridge, navigation server, red side processor, infosec, black side processor.

11. The signal generator according to claims 8, further comprising a bridging interface about said software defined radio processing elements.

12. The signal generator according to claims 8, further comprising a framework wherein said software defined radio processing elements and said combiner are components that are hardware independent.

13. A method for combining a plurality of navigation input signals into a navigation output, comprising:

Synchronizing said plurality of navigation input signals;

Resampling said navigation input signals to a common output rate;

Adjusting a carrier frequency by applying a Doppler shift;

Scaling said navigation signals;

Modulating said navigation signals; and

Summing said navigation signals into said navigation output signal.

14. The method according to claim 13, wherein said summing includes an additional global offset.

15. The method according to claim 13, wherein said resampling is at any arbitrary rate.

16. The method according to claims 13, further comprising generating at least one multipath.

17. The method according to claims 13, wherein said summing is represented according to the following:

18. The method according to claim 13, further comprising adjusting at least one of carrier phase, carrier frequency, and time on the output signal stream.

19. The method according to claim 13, further comprising processing faster than real time.

20. The method according to claim 13, wherein said method is implemented as a core application, further comprising wrapping a component virtual interface around said core application thereby creating a component, wherein said component virtual interface has a defined interface and is hardware independent;

wrapping a target platform interface around said component, wherein said target platform interface has a pre-defined interface and binds said component to a board; and

providing a bridge between said target platform interface and an external environment.