Coherent integration enhancement method, positioning method,...

Details Coherent integration enhancement method, positioning method,... Coherent integration enhancement method, positioning method,...

2008-06-18

2010-11-09

Tarcza, Thomas H (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

C342S357490

Reexamination Certificate

active

07830303

ABSTRACT:
Integrated correlation values (I and Q integrated correlation values) between each of I and Q signals obtained from a received signal and a code replica are calculated by a coherent integration process performed by a correlation process circuit section32. A coherent integration enhancement circuit section converts a phase angle θ of each of the I and Q integrated correlation values (IQ coordinate values) into a double angle, and further integrates the converted I and Q integrated correlation values (IQ coordinate values) to calculate I and Q enhanced integrated correlation values. An incoherent integration circuit section performs an incoherent integration process on the I and Q enhanced integrated correlation values. A coherent integration time T1of the correlation circuit section is set to be 20 ms or less, and an integration time T2of the coherent integration enhancement circuit section is set to be longer than 20 ms.

REFERENCES:
patent: 6625239 (2003-09-01), Shiraishi et al.
patent: 7619559 (2009-11-01), DiEsposti
patent: 2004/0167713 (2004-08-01), Basch et al.
patent: 3787592 (2006-04-01), None
patent: WO 00/14568 (2000-03-01), None

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