Method and system for eliminating VSWR errors in phase and amplitude measurements

1. A method for reducing VSWR effects, comprising:

receiving at least one signal having a phase;

taking a first measurement of signal parameters;

receiving the signal with its phase shifted;

taking a second measurement of the signal parameters with the phase shifted;

processing the first and second measured parameters to eliminate VSWR effects and determine a true magnitude and phase of the signal; and

outputting the true magnitude and phase of the signal.

2. The method of claim 1 ,

wherein the processing step further comprises determining a true In-Phase (I) and a Quadrature-phase (Q) representation of the signal based on the first and second measurements.

3. The method of claim 2 , further comprising determining the true magnitude and phase of the signal based on at least I and Q.

4. The method of claim 2 , further comprising shifting the phase of the signal under test 180 degrees to generate the signal with its phase inverted.

5. The method of claim 1 , wherein the first and second measuring steps further comprise:

determining an In-Phase (I 1 ) and a Quadrature-phase (Q 1 ) representation of the signal: and

determining an In-Phase (I 2 ) and a Quadrature-phase (Q 2 ) representation of the signal with its phase shifted.

6. The method of claim 5 , further comprising determining the true I and Q of the signal under test at least based on I 1 , Q 1 , I 2 , and Q 2 .

7. The method of claim 6 , wherein I=(I 1 −I 2 )/2 and Q=(Q 1 −Q 2 )/2.

8. The method of claim 1 further comprising shifting the phase of the signal by 180 degrees.

9. A method, comprising:

determining an In-Phase (I 1 ) and a Quadrature-phase (Q 1 ) representation of a microwave signal:

determining an In-Phase (I 1 ) and a Quadrature-phase (Q 2 ) representation of the microwave signal with its phase shifted by 180 degrees; determining a true In-Phase (I) and a Quadrature-phase (Q) representation of the signal based on at least I 1 , Q 1 , I 2 , and Q 2 ;

determining a true magnitude and a true phase of the microwave signal based on I and Q; and

outputting the true magnitude and the true phase to a display for display.

10. The method of claim 9 , wherein I=(I 1 −I 2 )/2 and Q=(Q 1 −Q 2 )/2.

11. The method of claim 9 , further comprising:

generating the signal with a device under test;

providing the signal and the signal with its phase shifted to a receiver; and

measuring I 1 , Q 1 , I 2 , and Q 2 , with the receiver.

12. The method of claim 9 , further comprising:

providing I 1 , Q 1 , I 2 , and Q 2 , to a computer; and

determining the true I and Q with a computer based on I 1 , Q 1 , I 2 , Q 2 .

13. A system, comprising:

a measurement receiver adapted to receive a signal under test and to measure an In-Phase (I 1 ) and a Quadrature-phase (Q 1 ) representation of the signal under test and an In-Phase (I 1 ) and a Quadrature-phase (Q 2 ) representation of the signal under test with its phase shifted; and

an analyzer adapted to receive I 1 , Q 1 , I 2 , and Q 2 from the measurement receiver and to determine a true magnitude and phase of the signal under test based on I 1 , Q 1 , I 2 , and Q 2 wherein the analyzer determines a true I and Q for the signal under test based on at least I 1 , Q 1 , I 2 , and Q 2 .

14. The system of claim 13 , wherein the analyzer determines the true magnitude and the true phase based on at least the true I and Q.

15. A method, comprising:

determining an In-Phase (I 1 ) and a Quadrature-phase (Q 1 ) representation of a microwave signal:

determining an In-Phase (I 1 ) and a Quadrature-phase (Q 2 ) representation of the microwave signal with its phase shifted by 180 degrees;

providing I 1 , Q 1 , I 2 , and Q 2 , to a computer;

determining a true I and Q representation of the microwave signal with the computer based on I 1 , Q 1 , I 2 , Q 2 ;

determining a true magnitude and a true phase of the signal under test based on at least I and Q; and

displaying at least one of the true magnitude and the true phase on a display.