Compensation for receiver and satellite signal differences
First Claim
1. A method for compensation of a receiver/processor (R/P) that receives electronic communication signals from at least two signal sources, the method comprising the steps of:
- providing first, second and third receiver/processors, numbered R=R1, R=R2 and R=R3, respectively, located at the same site;
providing two signal sources, numbered S2 and S3, that are spaced apart from the first, second and third R/Ps and that transmit second and third signals that are received and processed as time-varying signals S(t;
R;
SV) (SV=S2 and S3) by the receiver/processors R=R1 R=R2 and R=R3 ;
forming double difference '"'"'signals ##EQU3## forming time averaged signals ##EQU4## where T is a selected time interval of length in the range 120≦
T≦
1800 sec;
forming the compensated signals ##EQU5## forming a compensated signal, for the second and third source signals and for second and third receiver/processors that are not confined to the same site, that is defined by
space="preserve" listing-type="equation">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).
3 Assignments
0 Petitions
Accused Products
Abstract
A method for compensating for the differences in time varying signals S(t;R;S) received and processed by two signal receiver/processors (R2 and R3), located at the same site, from two signal sources (S2 and S3) that are spaced apart from the receiver/processors. A receiver/processor (R1) is chosen as a baseline, and double difference signals DD(t;R1 ;R2 ;S2 ;S3)=S(t;R1 ;S2)-S(t;R1 ;S3)-S(t;R2 ;S2)+S(t;R2 ;S3) and DD(t;R1 ;R3 ;S2 ;S3)=S(t;R1 ;S2)-S(t;R1 ;S3)-S(t;R3 ;S2)+S(t;R3 ;S3) are formed. The respective time averages DD(R1 ;R2 ;S2 ;S3)avg and DD(R1 ;R3 ;S2 ;S3)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≦T≦1800 sec. First difference signals, DDC(t;R1 ;R2 ;S2 ;S3)=DD(t;R1 ;R2 ;S2 ;S3)- DD(R1 ;R2 ;S2 ;S3)avg and DDC(t;R1 ;R3 ;S2 ;S3)=DD(t;R1 ;R3 ;S2 ;S3)-DD(R1 ;R3 ;S2 ;S3)avg, are formed. A time varying compensated signal DDC(t;R2 ;R3 ;S2 ;S3)=DDC(t;R1 ;R2 ;S2 ;S3)-DDC(t;R1 ;R3 ;S2 ;S3) is then formed that compensates for the differences in signals that are contemporaneously received from the signal sources S2 and S3 at the receiver/processors R2 and R3 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.
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Citations
8 Claims
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1. A method for compensation of a receiver/processor (R/P) that receives electronic communication signals from at least two signal sources, the method comprising the steps of:
-
providing first, second and third receiver/processors, numbered R=R1, R=R2 and R=R3, respectively, located at the same site; providing two signal sources, numbered S2 and S3, that are spaced apart from the first, second and third R/Ps and that transmit second and third signals that are received and processed as time-varying signals S(t;
R;
SV) (SV=S2 and S3) by the receiver/processors R=R1 R=R2 and R=R3 ;forming double difference '"'"'signals ##EQU3## forming time averaged signals ##EQU4## where T is a selected time interval of length in the range 120≦
T≦
1800 sec;forming the compensated signals ##EQU5## forming a compensated signal, for the second and third source signals and for second and third receiver/processors that are not confined to the same site, that is defined by
space="preserve" listing-type="equation">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). - View Dependent Claims (2, 4)
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3. A method for compensation of a receiver/processor that receives electronic communication signals from at least two signal sources, the method comprising the steps of:
-
providing first, second and third receiver/processors, numbered R=R1, R=R2 and R=R3, respectively, located at the same site; providing three signal sources, numbered SV=S1, SV=S2 and SV=S3, that are spaced apart from the first, second and third R/Ps and that transmit first, second and third signals that are received and processed as time-varying signals S(t;
R;
SV) by the receiver/processors R=R1, R=R2 and R=R3 ;forming double difference signals ##EQU6## forming time averaged signals ##EQU7## where T is a selected time interval of length in the range 120≦
T≦
1800 sec;forming the compensated signals ##EQU8## forming a compensated signal, for the second and third satellite signals and for second and third receiver/processors that are not confined to the same site, that is defined by ##EQU9##
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5. A method for compensation of a receiver/processor that receives electronic communication signals from at least two signal sources, each of which can transmit a signal either in any of N modes, numbered M=1, 2, . . . , N (N≧
- 2), the method comprising the steps of;
providing a selected first receiver/processor (R/Ps), numbered R=R1 as a baseline R/P; providing second and third R/Ps, numbered R=R2 and R=R3, respectively, located at the same site; providing two signal sources, numbered SV=S2 and SV=S3 with respective transmission modes M=M2 and M=M3, that are spaced apart from the first, second and third R/Ps and that transmit second and third signals (SV=S2, M=M2 ; and
SV=S3, M=M3), respectively, that are received and processed as time varying signals S(t;
R;
SV;
M) by the R/Ps R=R1, R=R2 and R=R3 ;forming double difference signals ##EQU10## forming time averaged signals ##EQU11## where T is a selected time interval of length in the range 120≦
T≦
1800 sec;forming the first difference signals ##EQU12## forming a compensated signal, for the second and third satellite signals and for second and third R/Ps that are not confined to the same site, that is defined by ##EQU13## - View Dependent Claims (6, 7, 8)
- 2), the method comprising the steps of;
Specification
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- Resources
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Current AssigneeTrimble Navigation Limited 645 North Mary Avenue
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Original AssigneeTrimble Navigation Limited (Trimble Inc.)
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InventorsLennen, Gary R.
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Primary Examiner(s)Voeltz, Emanuel T.
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Assistant Examiner(s)VO, HIEN XUAN
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Application NumberUS08/302,592Time in Patent Office642 DaysField of Search364/516, 364/424.01, 364/526, 364/572-575, 364/571.02, 364/449, 342/357, 342/358, 342/402, 342/405, 342/420-421, 375/200-210, 375/220, 375/237, 375/243US Class Current702/85CPC Class CodesG01S 19/23 Testing, monitoring, correc...G01S 19/40 Correcting position, veloci...
