CN102201878B - Method and apparatus for separating influences of signal source and analyzer on vector modulation error - Google Patents

Abstract

The invention discloses a method and apparatus for separating influences of a signal source and an analyzer on a vector modulation error, which are used for solving the technical problem that the influences of a VSG (Vector Signal Generator) and a VSA (Vector Signal Analyzer) on the vector modulation error cannot be separated and the accurate calibration cannot be conducted. By applying the method provided by the invention to the calibration of the VSG and/or the VSA, the measurement and calibration accuracy of the VSG and the VSA can be enhanced and the basis for establishing a measurement tracing system of digital modulation parameters can be provided.

Description

Separation signal source and analyzer are to method and the device of the influence of vector modulation error

Technical field

The present invention relates to vector signal generator/vector signal source (Vector Signal Generator, VSG) and VSA (Vector Signal Analyzer, VSA) field of measuring techniques, particularly a kind of method and device that in calibration process, separates VSG and the vector modulation error influence of VSA.

Background technology

The Vector Modulation signal is the main carrier of modern digital communication systems information transmission, in the research and development and production process of digital communication product, must use VSA and VSG respectively transmitter and receiver partly to be measured and tested.Guarantee to obtain accurate, reliable measurement, test result in Related product research and development and the production, the accuracy of measurement of institute's use instrument must be guaranteed fully.To be exactly measurement value that reality is used instrument be traceable on the value that national standard reappears by the continual chain of tracing to the source the task of calibration, the actual accuracy of measurement of using instrument of checking thus, or determine the error of indication measured.According to the calibrating standard of present China to this two quasi-instrument: " JJF1174-2007 vector signal generator calibrating standard ", " JJF1128-2004 VSA calibrating standard ", the vector signal generator is to use a VSA as standard that its vector signal that sends is measured and calibrated, simultaneously, VSA is to use a vector signal generator as standard that its measurement and accuracy of analysis are calibrated.For the key parameters in the calibration process---for the vector modulation error parameter, when the calibration vector signal generator, suppose that be accurately as the VSA of standard to the measurement of vector modulation error, do not have the error of indication; Equally, when VSA is calibrated, suppose that the vector signal that the vector signal generator as standard sends is not have vector modulation error, the vector modulation error that this moment, VSA was read is exactly the error of indication of this analyzer.Yet it is actual that this hypothesis does not meet, and has certain error of indication as the VSA of standard when measuring the modulation error of vector signal, and the standard signal that sends as the vector signal generator of standard also has certain initial modulation error.It is desirable causing present this needs hypothesis one side, the present situation that the opposing party is calibrated again, under this assumed condition, the accuracy of metering will be under suspicion, the main cause that produces this present situation is with regard to be can not the influence to vector modulation error separates with VSA with regard to the vector signal generator, thereby causes the defective that can't accurately calibrate this two quasi-instrument.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of separation signal source and analyzer method and device to the influence of vector modulation error, be used for solution and must not separate the technical problem that accurately to calibrate with the influence of the vector modulation error of VSA VSA with regard to vector signal generator VSG.

For achieving the above object, technical scheme of the present invention is achieved in that

A kind of separation signal source and analyzer are to the method for the influence of vector modulation error, and this method comprises:

The uneven parameter of IQ channel gain that vector signal generator VSG is set is g ₁, read corresponding root mean square phase error by VSA VSA

The uneven parameter of IQ channel gain that VSG is set is g ₂, read corresponding root mean square phase error by VSA

Calculate the uneven parameter of IQ channel gain that VSG carries by following equation group 1 Linear measurement error coefficient Δ PErr with phase error:

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="PhaseErr\; RMS"\; filenames="HSA00000502494300032.png"\; state="\{\{state\}\}">PhaseErr</figure-callout>}}_{{\mathrm{RMS}}_{}}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_1}\right)+\mathrm{\&Delta;PErr}\\ {\mathrm{<figure-callout\; id="2"\; label="PhaseErr\; RMS"\; filenames="HSA00000502494300032.png,HSA00000502494300041.png"\; state="\{\{state\}\}">PhaseErr</figure-callout>}}_{{\mathrm{RMS}}_{}}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_2}\right)+\mathrm{\&Delta;PErr}\end{array}\right.$ (equation group 1)

The uneven parameter of IQ channel phases is set is

Measure the rms amplitude error that obtains correspondence by VSA

The uneven parameter of IQ channel phases is set is Measure the rms amplitude error that obtains correspondence by VSA

The uneven parameter of IQ channel phases is set is

Measure the rms amplitude error that obtains correspondence by VSA

Calculate the uneven parameter of IQ channel phases that VSG carries by following equation group 2

The first order nonlinear error coefficient k of range error _mLinear measurement error coefficient Δ MErr with range error:

(equation group 2)

The uneven parameter of the IQ channel gain that carries according to described VSG

The uneven parameter of the IQ channel phases that carries with VSG

Calculate corresponding to the uneven parameter of the IQ channel phases that arranges arbitrarily according to following equation 10,11 and 12 respectively

With the uneven parameter g of IQ channel gain _j(i, j=1,2,3......), the rms amplitude error that is caused by VSG

The root mean square phase error

And root-mean-square error amplitude of the vector

(equation 10)

${\mathrm{PhaseErr}}_{\mathrm{RMSj}}^{\mathrm{VSG}}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_j}\right)$ (equation 11)

(equation 12).

Further, described method also comprises:

Be used in the uneven parameter of IQ channel phases is set The time, the rms amplitude error that VSA records

Deduct the rms amplitude error that is caused by VSG

Obtain the rms amplitude error that caused by VSA

Be used in the uneven parameter g of IQ channel gain is set _jThe time, the root mean square phase error that VSA records

Deduct the root mean square phase error that is caused by VSG Obtain the root mean square phase error that caused by VSA

Be used in the uneven parameter of IQ channel phases is set With the uneven parameter g of IQ channel gain _jThe time, the root-mean-square error amplitude of the vector that VSA records

Deduct the root-mean-square error amplitude of the vector that is caused by VSG

Obtain the root-mean-square error amplitude of the vector that caused by VSA

Based on the embodiment of the invention, the present invention also proposes a kind of separation signal source and analyzer to the device of the influence of vector modulation error, and this device comprises:

The first configuration computing unit is for the uneven parameter g of the IQ channel gain that VSG is set respectively ₁And g ₂, measure acquisition and g respectively by VSA ₁Corresponding root mean square phase error

With with g ₂Corresponding root mean square phase error

, calculate the uneven parameter of IQ channel gain that VSG carries by given equation group 1 then Linear measurement error coefficient Δ PErr with phase error:

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="PhaseErr\; RMS"\; filenames="HSA00000502494300032.png"\; state="\{\{state\}\}">PhaseErr</figure-callout>}}_{{\mathrm{RMS}}_{}}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_1}\right)+\mathrm{\&Delta;PErr}\\ {\mathrm{<figure-callout\; id="2"\; label="PhaseErr\; RMS"\; filenames="HSA00000502494300032.png,HSA00000502494300041.png"\; state="\{\{state\}\}">PhaseErr</figure-callout>}}_{{\mathrm{RMS}}_{}}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_2}\right)+\mathrm{\&Delta;PErr}\end{array}\right.$ (equation group 1)

The second configuration computing unit for the uneven parameter of IQ channel phases is set respectively is

With

By VSA measure respectively obtain with

Corresponding rms amplitude error

, with Corresponding rms amplitude error With with

Corresponding rms amplitude error

, and calculate the uneven parameter of IQ channel phases that VSG carries by given equation group 2

The first order nonlinear error coefficient k of range error _mLinear measurement error coefficient Δ MErr with range error:

(equation group 2)

The first error separative element is used for according to described

With

Calculate corresponding to the uneven parameter of the IQ channel phases that arranges arbitrarily according to given equation 10,11 and 12 respectively

The uneven parameter g of IQ channel gain _j(i, j=1,2,3......), the rms amplitude error that is caused by VSG

The root mean square phase error And root-mean-square error amplitude of the vector

(equation 10)

${\mathrm{PhaseErr}}_{\mathrm{RMSj}}^{\mathrm{VSG}}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_j}\right)$ (equation 11)

(equation 12).

Further, described device also comprises:

The second error separative element, be used in arrange described

And g _jThe time, the rms amplitude error that VSA records The root mean square phase error

With the root-mean-square error amplitude of the vector

Deduct described respectively

With

Thereby the rms amplitude error that acquisition is caused by the VSA instrument The root mean square phase error

The root-mean-square error amplitude of the vector

Method and device with separation VSG provided by the invention and the vector modulation error influence of VSA, be applied in the calibration of VSG and/or VSA, can improve that this two quasi-instrument is measured and the accuracy of calibration, can be and set up digital modulation parameter magnitude tracing system the basis is provided.

Description of drawings

Fig. 1 is the Experimental equipment of the inventive method;

The definition schematic diagram of the vector modulation error that Fig. 2 relates to for the inventive method;

Fig. 3 is the method flow diagram of separation VSG provided by the invention and the vector modulation error influence of VSA;

Fig. 4 separates VSG for the full simulation process of passing through of providing of the embodiment of the invention one and the vector modulation error of VSA influences, and the method flow diagram of checking accuracy in computations;

Fig. 5 is the MagErr that is introduced by VSG and VSA respectively that has shown after adopting the inventive method to separate _RMS, wherein the VSG curve is represented the MagErr that vector signal generator initial error parameter causes _RMSComponent, VSA curve are represented the MagErr that VSA measured value error causes _RMSComponent;

Fig. 6 is the PhaseErr that is introduced by VSG and VSA respectively that has shown after adopting the inventive method to separate _RMS, wherein the VSG curve is represented the PhaseErr that VSG initial error parameter causes _RMSComponent, VSA curve represent that VSA measures the PhaseErr that the error of indication causes _RMSComponent;

Fig. 7 has shown the EVM that is introduced by VSG and VSA respectively after adopting the inventive method to separate among the embodiment one _RMS, wherein the VSG curve is represented the EVM that VSG initial error parameter causes _RMSComponent, VSA curve represent that VSA measures the EVM that the error of indication causes _RMSComponent.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.

Shown in Figure 1 is the Experimental equipment of the inventive method, and VSG sends the Vector Modulation signal, and input VSA carries out the parametric analysis of vector solution mediation modulation error.Wherein most important modulation error parameter comprises: range error (Magnitude Error, MagErr), phase error (Phase Error, PhaseErr) and Error Vector Magnitude (Error Vector Magnitude, EVM), as shown in Figure 2, the angle between reference signal vector R and the actual signal vector S

Be phase error, the amplitude of vectorial difference is Error Vector Magnitude between actual signal vector S and the reference signal vector R, and the difference of the amplitude of actual signal vector S and the amplitude of reference signal vector R is range error.If the modulation error of all symbols is carried out the root mean square statistics, can draw rms amplitude error MagErr _Rms, root mean square phase error PhaseErr _RmsWith root-mean-square error amplitude of the vector EVM _Rms

When carrying out Vector Modulation, VSG often has initial modulation error, and this modulation error is mainly derived from VSG in carrying out the Vector Modulation process, because the amplitude imbalance that is modulated at the IQ baseband signal on the carrier wave that the gain difference of IQ passage (comprising I passage and/or Q passage) causes, and because the reference phase of IQ passage is not that strictness differs 90 ° of unbalance in phase that are modulated at the IQ baseband signal on the carrier wave that cause.The present invention proposes by following formula (1) vector signal that VSG exports to be carried out modeling:

Wherein, S (t) is the vector signal of VSG output, and I (t) is I road signal, and Q (t) is Q road signal, and t is time variable, f _cBe carrier frequency,

The uneven parameter of the IQ channel gain that carries for VSG,

The uneven parameter of the IQ channel phases that carries for VSG.

With

Being that the undesirable property in vector signal source causes, is unknown parameter.

VSA can introduce measure error in the process of carrying out the vector modulation error measurement and analyzing.For range error, because the existence of nonlinear devices such as amplifier, attenuator, the error of introducing is not only the linear measurement error usually, also has the nonlinear measurement error that changes with changes in amplitude.For phase error, can only consider the linear measurement error.The present invention proposes by following formula (2) and (3) relation between the relation between range error measured value and the range error true value and phase error measured value and the phase error true value to be carried out modeling:

MagErr _RMS=MagErr _RMS ^*×(1+k _m)+ΔMErr （2）

PhaseErr _RMS=PhaseErr _RMS ^*+ΔPErr （3）

Wherein, subscript RMS represents root-mean-square value; Represent true value subscript * number, be different from the measured value of VSA, i.e. MagErr _RMS ^*Be the true value of rms amplitude error, MagErr _RMSBe the rms amplitude error measuring value.PhaseErr _RMS ^*Be the true value of root mean square phase error, PhaseErr _RMSBe the measured value of root mean square phase error, k _mBe the first order nonlinear error coefficient of range error, Δ MErr and Δ PErr are respectively the linear measurement error coefficient of range error and phase error.k _m, Δ MErr and these three parameters of Δ PErr are that the undesirable property of VSA causes, and also are unknown parameters.

Formula (2) (3) substitution formula (4) can be tried to achieve root-mean-square value Error Vector Magnitude EVM _RMS:

${\mathrm{EVM}}_{\mathrm{RMS}}=\sqrt{1+{(1+{\mathrm{MagErr}}_{\mathrm{RMS}})}^2-2\&times;(1+{\mathrm{MagErr}}_{\mathrm{RMS}})\cos ({\mathrm{PhaseErr}}_{\mathrm{RMS}}\&times;\mathrm{\&pi;}/180)}---\left(4\right)$

In the actual measurement process, owing to there is the existence of the initial modulation sum of errors VSA measure error of VSG non-zero, if can't separate the influence by VSG and the vector modulation error of VSA, just can't calibrate accurately VSG and/or VSA.

The method of the separation VSG that the present invention proposes and the influence of the vector modulation error of VSA may further comprise the steps, as shown in Figure 3:

Step 301, connection VSG and VSA, VSG and VSA carry out initialization respectively;

Step 302, VSG and the basic modulation parameter of VSA are set, make VSA can carry out proper solution and be in harmonious proportion the modulation error parametric analysis;

Step 303, the uneven parameter of IQ channel gain that VSG is set are g ₁, measure corresponding root mean square phase error by VSA

Step 304, the uneven parameter of IQ channel gain that VSG is set are g ₂, measure corresponding root mean square phase error by VSA

Step 305, the uneven parameter of IQ channel phases that VSG is set are

, measure corresponding rms amplitude error by VSA

Step 306, the uneven parameter of IQ channel phases that VSG is set are

Measure corresponding rms amplitude error by VSA

Step 307, the uneven parameter of IQ channel phases that VSG is set are

Measure corresponding rms amplitude error by VSA

Step 308, with g ₁, g ₂,

, The phase error equation group of substitution following (5) and (6) calculates the uneven parameter of IQ channel gain that VSG carries

Linear measurement error coefficient Δ PErr with phase error;

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="PhaseErr\; RMS"\; filenames="HSA00000502494300032.png"\; state="\{\{state\}\}">PhaseErr</figure-callout>}}_{{\mathrm{RMS}}_{}}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_1}\right)+\mathrm{\&Delta;PErr}---\left(5\right)\\ {\mathrm{<figure-callout\; id="2"\; label="PhaseErr\; RMS"\; filenames="HSA00000502494300032.png,HSA00000502494300041.png"\; state="\{\{state\}\}">PhaseErr</figure-callout>}}_{{\mathrm{RMS}}_{}}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_2}\right)+\mathrm{\&Delta;PErr}---\left(6\right)\end{array}\right.$

Step 309, general

,

,

The range error equation group of substitution following (7), (8) and (9) calculates the uneven parameter of IQ channel phases that VSG carries

The first order nonlinear error coefficient k of range error _mLinear measurement error coefficient Δ MErr with range error;

Step 310, will solve

Substitution formula (10-12) can calculate corresponding to parameter is set arbitrarily

g _j(i, j=1,2, the rms amplitude error that is caused by VSG in the time of 3......)

The root mean square phase error

And root-mean-square error amplitude of the vector value

And then based on the result of calculation of formula (10-12), the rms amplitude error that the VSA under these parameters is recorded according to formula (13-15) The root mean square phase error

The root-mean-square error amplitude of the vector

Deduct the modulation error that VSG causes and just can draw the rms amplitude error that VSA causes

The root mean square phase error

And root-mean-square error amplitude of the vector

${\mathrm{PhaseErr}}_{\mathrm{RMSj}}^{\mathrm{VSG}}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_j}\right),j=\mathrm{1,2,3}......---\left(11\right)$

${\mathrm{MagErr}}_{\mathrm{RMSi}}^{\mathrm{VSA}}={\mathrm{MagErr}}_{\mathrm{RMSi}}^{\mathrm{measurement}}-{\mathrm{MagErr}}_{\mathrm{RMSi}}^{\mathrm{VSG}}---\left(13\right)$

${\mathrm{PhaseErr}}_{\mathrm{RMSj}}^{\mathrm{VSA}}={\mathrm{PhaseErr}}_{\mathrm{RMSj}}^{\mathrm{measurement}}-{\mathrm{PhaseErr}}_{\mathrm{RMSj}}^{\mathrm{VSG}}---\left(14\right)$

${\mathrm{EVM}}_{\mathrm{RMSij}}^{\mathrm{VSA}}={\mathrm{EVM}}_{\mathrm{RMSij}}^{\mathrm{measurement}}-{\mathrm{EVM}}_{\mathrm{RMSij}}^{\mathrm{VSG}}---\left(15\right)$

By above step, can reach the purpose of the influence that separates VSG and the vector modulation error of VSA, can show by the result that mapping will separate.It should be noted that for the calibration of VSG, need pay close attention to usually to be it in the IQ gain uneven and IQ unbalance in phase parameter setting when all being zero, the initial modulation error that the remaining amount of unbalance that the undesirable characteristic of instrument causes causes, namely above

The modulation error that causes is just paid close attention to and is worked as

g _j=0 o'clock

With

The point.For the calibration of VSA because there is nonlinear measure error, so need to pay close attention to be with

g _jChange

The plane.

Embodiment one:

The full method of emulation of being based on first embodiment provided by the invention realizes, also can verify the correctness of the inventive method by the result of this embodiment, and implementing procedure is as shown in Figure 4, and is specific as follows:

As shown in Table 1, the initial error parameter of default VSG

VSA measure error coefficient k _m, Δ MErr and Δ PErr, and simulation parameter is set

And g ₁, g ₂In default error parameter and simulation parameter substitution formula (10-11), can simulation calculation go out corresponding range error

And phase error

, the measurement result of the VSA that namely simulates, as shown in Table 2.

${\mathrm{PhaseErr}}_{\mathrm{RMSj}}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_j}\right)+\mathrm{\&Delta;PErr},j=\mathrm{1,2}---\left(11\right)$

In the separation method with default simulation parameter and the VSA measurement result substitution the present invention proposition that simulates, specifically shown in step 308-step 310, can calculate the error parameter of VSG

Measure error parameter k with VSA _m', Δ MErr' and Δ PErr', as shown in form 2.With parameter preset relatively, can find in full accord, thereby verified the correctness of method provided by the invention.Can be to the parameter of any setting according to step 310

g _j(i, j=1,2, the 3......) influence of separation VSG and the modulation error of VSA.As Fig. 5-the 7th, VSG and the rms amplitude error of VSA MagErr after separating _RMS, root mean square phase error PhaseErr _RMSWith root-mean-square error amplitude of the vector EVM _RMSYing Xiang component respectively.Emphasis has shown among the figure

g _j=0 o'clock With

Value.

Form 1 this simulation calculation parameter arranges

Form 2 this simulation calculation results

Embodiment two:

The method of actual measurement of being based on second embodiment provided by the invention realizes.In this embodiment, use the E4438C vector signal generator VSG of Agilent company (Agilent) to carry out the vector signal modulation, the E4445A that uses Agilent separates as the vector signal of VSA VSA in conjunction with 89600VSA software and is in harmonious proportion the analysis of modulation error parameter, and experimental provision as shown in Figure 1.It is as follows that basic modulation parameter is set: the Vector Modulation mode is QPSK, carrier frequency is 1GHz, signal level amplitude-10dBm, code check 3.84Mbps, pulse shaping filter and matched filter are set to root raised cosine filter, reference filter is set to raised cosine filter, rolloff-factor α=0.22.

This moment, VSG initial error parameter and VSA measure error parameter were unknown.Press shown in the form 3, described according to step 301-step 307, measurement parameter is set respectively

And g ₁, g ₂, read measurement result successively by VSA

, , , ,

, as showing in the form 4.Measurement result according to the described method of step 308-step 310, is solved the error parameter of VSG

Measure error parameter k with VSA _m', Δ MErr' and Δ PErr', as showing in the form 4.

Similar with embodiment one, can be to the parameter of any setting according to step 310

g _j(i, j=1,2,3......) separate the influence of VSG and the modulation error of VSA, the modulation error that the VSG after in like manner can just separating and VSA cause respectively map demonstration, omission herein.

Especially, for present embodiment, at measurement parameter

g _j=0 o'clock, VSA was measured as EVM _RMS=0.38%, MagErr _RMS=0.30%, PhaseErr _RMS=0.13 °.Through the separation of the inventive method, learn that wherein the modulation error that is caused by VSG is

The modulation error that is caused by VSA is

Form 3 these experiment parameters arrange

Form 4 this experimental measurements and result of calculations

The above is preferred embodiment of the present invention only, is not for limiting protection range of the present invention.

Claims (4)

1. a separation signal source and analyzer is characterized in that the method for the influence of vector modulation error,

The uneven parameter of IQ channel gain that vector signal generator VSG is set is g ₁, read corresponding root mean square phase error by VSA VSA

The uneven parameter of IQ channel gain that VSG is set is g ₂, read corresponding root mean square phase error by VSA

Calculate the uneven parameter of IQ channel gain that VSG carries by following equation group 1

Linear measurement error coefficient Δ PErr with phase error:

$\left\{\begin{array}{c}{\mathrm{PhaseErr}}_{\mathrm{RMS}1}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_1}\right)+\mathrm{\&Delta;PErr}\\ {\mathrm{PhaseErr}}_{\mathrm{RMS}2}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_2}\right)+\mathrm{\&Delta;PErr}\end{array}\right.$ (equation group 1)

The uneven parameter of IQ channel phases is set is

, measure the rms amplitude error that obtains correspondence by VSA

The uneven parameter of IQ channel phases is set is

, measure the rms amplitude error that obtains correspondence by VSA

The uneven parameter of IQ channel phases is set is

, measure the rms amplitude error that obtains correspondence by VSA

Calculate the uneven parameter of IQ channel phases that VSG carries by following equation group 2

, range error first order nonlinear error coefficient k _mLinear measurement error coefficient Δ MErr with range error:

(equation group 2)

The uneven parameter of the IQ channel gain that carries according to described VSG

The uneven parameter of the IQ channel phases that carries with VSG

, calculate corresponding to the uneven parameter of the IQ channel phases that arranges arbitrarily according to following equation 10,11 and 12 respectively With the uneven parameter g of IQ channel gain _j(i, j=1,2,3......), the rms amplitude error that is caused by VSG

The root mean square phase error

And root-mean-square error amplitude of the vector

(equation 10)

${\mathrm{PhaseErr}}_{\mathrm{RMSj}}^{\mathrm{VSG}}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_j}\right)$ (equation 11)

(equation 12).

2. method according to claim 1 is characterized in that, described method also comprises:

Be used in the uneven parameter of IQ channel phases is set

The time, the rms amplitude error that VSA records

Deduct the rms amplitude error that is caused by VSG

Obtain the rms amplitude error that caused by VSA

Be used in the uneven parameter g of IQ channel gain is set _jThe time, the root mean square phase error that VSA records

Deduct the root mean square phase error that is caused by VSG

Obtain the root mean square phase error that caused by VSA

Be used in the uneven parameter of IQ channel phases is set

With the uneven parameter g of IQ channel gain _jThe time, the root-mean-square error amplitude of the vector that VSA records Deduct the root-mean-square error amplitude of the vector that is caused by VSG

Obtain the root-mean-square error amplitude of the vector that caused by VSA

3. a separation signal source and analyzer is characterized in that to the device of the influence of vector modulation error this device comprises:

The first configuration computing unit is for the uneven parameter g of the IQ channel gain that VSG is set respectively ₁And g ₂, measure acquisition and g respectively by VSA ₁Corresponding root mean square phase error

With with g ₂Corresponding root mean square phase error

, calculate the uneven parameter of IQ channel gain that VSG carries by given equation group 1 then

Linear measurement error coefficient Δ PErr with phase error:

$\left\{\begin{array}{c}{\mathrm{PhaseErr}}_{{\mathrm{RMS}}_1}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_1}\right)+\mathrm{\&Delta;PErr}\\ {\mathrm{PhaseErr}}_{{\mathrm{RMS}}_2}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_2}\right)+\mathrm{\&Delta;PErr}\end{array}\right.$ (equation group 1)

The second configuration computing unit for the uneven parameter of IQ channel phases is set respectively is

With

By VSA measure respectively obtain with

Corresponding rms amplitude error

, with

Corresponding rms amplitude error

With with

Corresponding rms amplitude error

, and calculate the uneven parameter of IQ channel phases that VSG carries by given equation group 2

, range error first order nonlinear error coefficient k _mLinear measurement error coefficient Δ MErr with range error:

(equation group 2)

The first error separative element is used for according to described

With

, calculate corresponding to the uneven parameter of the IQ channel phases that arranges arbitrarily according to given equation 10,11 and 12 respectively

The uneven parameter g of IQ channel gain _j(i, j=1,2,3......), the rms amplitude error that is caused by VSG

The root mean square phase error

And root-mean-square error amplitude of the vector

(equation 10)

${\mathrm{PhaseErr}}_{\mathrm{RMSj}}^{\mathrm{VSG}}=45-\frac{180}{\mathrm{\&pi;}}\mathrm{arctg}\left(\frac{1}{\stackrel{\&OverBar;}{g}\&times;g_j}\right)$ (equation 11)

(equation 12).

4. device according to claim 3 is characterized in that, described device also comprises:

The second error separative element, be used in arrange described And g _jThe time, the rms amplitude error that VSA records The root mean square phase error

With the root-mean-square error amplitude of the vector Deduct described respectively

With

Thereby, obtain the rms amplitude error that is caused by the VSA instrument

The root mean square phase error

The root-mean-square error amplitude of the vector

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