Compensation for receiver and satellite signal differences

Details Compensation for receiver and satellite signal differences Compensation for receiver and satellite signal differences

1994-09-08

1996-06-11

Voeltz, Emanuel T.

Boots, shoes, and leggings

342358, 342402, 364449, 364576, 375220, 375243, G01C 2100, G06G 719

Patent

active

055262910

ABSTRACT:
A method for compensating for the differences in time varying signals S(t;R;S) received and processed by two signal receiver/processors (R.sub.2 and R.sub.3), located at the same site, from two signal sources (S.sub.2 and S.sub.3) that are spaced apart from the receiver/processors. A receiver/processor (R.sub.1) is chosen as a baseline, and double difference signals DD(t;R.sub.1 ;R.sub.2 ;S.sub.2 ;S.sub.3)=S(t;R.sub.1 ;S.sub.2)-S(t;R.sub.1 ;S.sub.3)-S(t;R.sub.2 ;S.sub.2)+S(t;R.sub.2 ;S.sub.3) and DD(t;R.sub.1 ;R.sub.3 ;S.sub.2 ;S.sub.3)=S(t;R.sub.1 ;S.sub.2)-S(t;R.sub.1 ;S.sub.3)-S(t;R.sub.3 ;S.sub.2)+S(t;R.sub.3 ;S.sub.3) are formed. The respective time averages DD(R.sub.1 ;R.sub.2 ;S.sub.2 ;S.sub.3).sub.avg and DD(R.sub.1 ;R.sub.3 ;S.sub.2 ;S.sub.3).sub.avg of these two double difference signals are formed, using a time interval of length T lying in a preferred range given by 120 sec.ltoreq.T.ltoreq.1800 sec. First difference signals, DDC(t;R.sub.1 ;R.sub.2 ;S.sub.2 ;S.sub.3)=DD(t;R.sub.1 ;R.sub.2 ;S.sub.2 ;S.sub.3)- DD(R.sub.1 ;R.sub.2 ;S.sub.2 ;S.sub.3).sub.avg and DDC(t;R.sub.1 ;R.sub.3 ;S.sub.2 ;S.sub.3)=DD(t;R.sub.1 ;R.sub.3 ;S.sub.2 ;S.sub.3)-DD(R.sub.1 ;R.sub.3 ;S.sub.2 ;S.sub.3).sub.avg, are formed. A time varying compensated signal DDC(t;R.sub.2 ;R.sub.3 ;S.sub.2 ;S.sub.3)=DDC(t;R.sub.1 ;R.sub.2 ;S.sub.2 ;S.sub.3)-DDC(t;R.sub.1 ;R.sub.3 ;S.sub.2 ;S.sub.3) is then formed that compensates for the differences in signals that are contemporaneously received from the signal sources S.sub.2 and S.sub.3 at the receiver/processors R.sub.2 and R.sub.3 located at the same site. This compensated signal has the property that its time varying value, when averaged over a time interval of length T, has a magnitude that is either zero or is less than a small positive threshold value. This compensation approach can be extended to receipt of more than one kind of coded signal, such as P code or C/A code in the presence of or absence of anti-spoofing, each of which is processed differently by a receiver/processor. This compensation can be used for any type of receiver/processor and is especially useful in compensation for receiver/processors used in Satellite Positioning Systems, such as GPS and GLONASS.

REFERENCES:
patent: 3778830 (1973-12-01), Joseph
patent: 5148179 (1992-09-01), Allison
patent: 5339246 (1994-08-01), Kao
patent: 5345245 (1994-09-01), Ishikawa et al.
patent: 5373298 (1994-12-01), Karouby
patent: 5450448 (1995-09-01), Sheynblat

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