Method and apparatus for determining position using global posit

Details Method and apparatus for determining position using global posit Method and apparatus for determining position using global posit

1996-04-01

1998-08-11

Issing, Gregory C.

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

Directive

Including a satellite

375208, G01S 502, H04B 7185

Patent

active

057933286

ABSTRACT:
A global positioning satellite receiver having an antenna for receiving a L1 signal from a satellite. The L1 signal is processed by a preamplifier stage including a band pass filter and a low noise amplifier and output as a radio frequency (RF) signal. A mixer receives and de-spreads the RF signal in response to a pseudo-random noise code, i.e., Gold code, generated by an internal pseudo-random noise code generator. A microprocessor enters a code tracking loop, such that during the code tracking loop, it addresses the pseudo-random code generator to cause the pseudo-random code generator to sequentially output pseudo-random codes corresponding to satellite codes used to spread the L1 signal, until correlation occurs. When an output of the mixer is indicative of the occurrence of correlation between the RF signal and the generated pseudo-random codes, the microprocessor enters an operational state which slows the receiver code sequence to stay locked with the satellite code sequence. The output of the mixer is provided to a detector which, in turn, controls certain routines of the microprocessor. The microprocessor will output pseudo range information according to an interrupt routine in response detection of correlation. The pseudo range information is to be telemetered to a ground station which determines the position of the global positioning satellite receiver.

REFERENCES:
patent: 4754283 (1988-06-01), Fowler
patent: 5347285 (1994-09-01), MacDoran et al.
patent: 5347546 (1994-09-01), Abadi et al.
patent: 5379224 (1995-01-01), Brown et al.
patent: 5402441 (1995-03-01), Washizu et al.
patent: 5457713 (1995-10-01), Sanderford, Jr. et al.

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