	US 7,463,617 B2
	Mitigation of CDMA cross-correlation artifacts and improvement in signal-to-noise ratio in TDMA location networks
James Lamance, c/- Locata Corporation, 401 Clunies Ross St, Acton, A.C.T. 2601 (Australia); and David Small, c/- Locata Corporation, 401 Clunies Ross St, Acton, A.C.T. 2601 (Australia)
Appl. No. 10/565,874 PCT Filed Aug. 03, 2004, PCT No. PCT/AU2004/001025 § 371(c)(1), (2), (4) Date Jan. 24, 2006, PCT Pub. No. WO2005/013633, PCT Pub. Date Feb. 10, 2005.
Claims priority of application No. 2003904045 (AU), filed on Aug. 04, 2003.
Prior Publication US 2007/0058591 A1, Mar. 15, 2007
Int. Cl. H04B 7/212 (2006.01); H04B 7/216 (2006.01); H04B 1/00 (2006.01); H04J 3/06 (2006.01)

U.S. Cl. 370—347 [370/335; 370/337; 370/350; 370/515; 375/150]

4 Claims

1. A method of sequentially receiving a plurality of TDMA positioning signals broadcast in a known TDMA sequence, the method comprising:

a) deploying a position receiver containing:

i) means to receive and interpret said TDMA positioning signals;

ii) at least one correlator communicatively coupled to said position receiver, each correlator configured with:

I. means for providing a master timing reference for said correlator;

II. means to analyse the relationship between the reception time of the TDMA positioning signals and said master timing reference, and subsequently determine the start and stop times of the correlator integration interval relative to said master timing reference;

III. means to sequentially generate a next PRN (pseudo-random number) code of the known TDMA sequence responsive to said determined start and stop times;

b) receiving at least one TDMA positioning signal at said position receiver and determining said reception time of said TDMA signals;

c) communicating said determined reception time to said at least one correlator, thereby generating a PRN sequence in synchronicity with the reception of said TDMA positioning signals.