APPLICATION OF PSEUDO-NOISE CORRELATION & BANDWIDTH SYNTHESIS TO ORBIT DETERMINATION

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: N/A
Agency Tracking Number: 636
Amount: $499,995.00
Phase: Phase II
Program: SBIR
Awards Year: 1984
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Stanford Telecommunications
6888 Elm Street, Mclean, VA, 22101
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Aaron Weinberg
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
A TECHNIQUE WHICH COMBINES THE USE OF PSEUDO-NOISE (PN) CODECORRELATION AND MULTILATERATION WITH ANOTHER TECHNIQUE, TERMED "BANDWIDTH SYNTHESIS" (BWS), TO SIGNIFICANTLY ENHANCETHE ACCURACY OF SATELLITE ORBIT DETERMINATION IS THE FOCUS OF THIS PROJECT. FROM A THEORETICAL VIEWPOINT, BWS ALLOWS ONE TO CONSTRUCT A VERY WIDEBAND PN CORRELATION FUNCTION (E.G., REFLECTING MORE THAN 100 MHZ) BY EMPLOYING MULTIPLE PN CODES, EACH OF RELATIVELY NARROW-BANDWIDTH (E.G., LESS THAN 10 MHZ), WITH EACH OCCUPYING A DISJOINT FREQUENCY BAND.THIS BWS TECHNIQUE HAS BEEN APPLIED TO INTERFEROMETRY BUT APPARENTLY NOT TO PN CORRELATION/MULTILATERATION. THE GOALSOF THIS RESEARCH ARE: TO DEVELOP THE THEORETICAL BASIS FOR BWS/PN/MULTILATERATION (BWSPNM), CONSIDER HARDWARE AND SOFTWARE PROCESSING TECHNIQUES THAT MAY PROVIDE A CAPABILITYFOR NEAR-REAL-TIME ORBIT DETERMINATION, IDENTIFY ERROR SOURCES AND ASSESS THEIR POTENTIAL, AND ILLUSTRATE HOW BWSPNM MAY BE APPLIED VIA BOTH EXISTING SYSTEMS - SUCH AS TDRSS AND GPS - AND VIA FUTURE SYSTEMS. SIGNIFICANT BENEFITS OF BWSPNM RELATIVE TO OTHER TECHNIQUES, SUCH AS INTERFEROMETRY, ARE IDENTIFIED; POSSIBLE BENEFITS MIGHT BE REDUCTIONS IN REQUIREMENTS FOR FREQUENCY STANDARD STABILITY AND DATA TRANSFER.

* information listed above is at the time of submission.

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