GPS near-far resistant receiver

(21) Appl. No.: 10/243,301

(22) Filed: Sep. 12, 2002

(65) Prior Publication Data

US 2003/0218568 Al Nov. 27, 2003

Related U.S. Application Data

(60) Provisional application No. 60/322,914, filed on Sep. 12, 2001.

(51) Int. CI.7 G01S 5/02; H04B 7/185

(52) U.S. CI 342/357.12; 342/357.06;

701/213

(58) Field of Search 342/357.12, 357.06;

701/213

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Primary Examiner—-Theodore M. Blum

(74) Attorney, Agent, or Firm—Sheridan Ross PC.

(57) ABSTRACT

A method and receiver are disclosed for mitigating or substantially canceling signal interference between signals detected at the receiver. Once a presumed interfering signal (s) is acquired, parameters are determined that allow the interlerer(s) to be modeled. An orthogonal projection (for projecting onto a subspace orthogonal to that spanned by the interlerer(s)) is applied to the composite ol all signals (y) for thereby projecting y onto this subspace, wherein the subspace is non-orthogonal to a representation ol desired (but interfered) signal ol the composite signals. With the receiver properly equipped to perform this projection operation, interfering signals, multipath, spoofing and/or meaconing can be effectively diminished.

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