Compensation for differences in receiver signals and in satellit

Details Compensation for differences in receiver signals and in satellit Compensation for differences in receiver signals and in satellit

1996-05-31

1998-05-26

Voeltz, Emanuel T.

Boots, shoes, and leggings

3644498, 364576, 342358, 342402, 375320, 375243, G01C 2100, G06G 719

Patent

active

057576777

ABSTRACT:
Method and apparatus for compensating for the differences in time varying signals S(t;R;S) received and processed by two signal receivers (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 receivers. A receiver (R.sub.1) is chosen as a baseline, and two 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. Time averages of these two double difference signals are formed, using a time interval of length T lying in a preferred range, and are subtracted from the corresponding double difference signals to form first and second compensated signals. A time varying third compensated signal, equal to the difference of the first and second compensated signals, is 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 receivers 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 extends 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 useful in compensation for receiver/processors used in Satellite Positioning Systems, such as GPS and GLONASS.

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Tom Logston, The NAVSTAR Global Positioning System, Van Nostrand Reinhold, New York, 1992.
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