JP2001102846A - Attenuation quantity/phase control method and signal processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide speedy control while reducing labor required for measurements to be performed beforehand concerning a signal processor for generating an output signal having a desired signal level and a desired phase from an input signal by using an attenuator and a phase shifter. SOLUTION: A signal processor 1 controls the signal level and phase of an inputted first signal by using an attenuator 11 and a phase shifter 12 and generates a second signal having a desired signal level and phase. While using various kinds of information held in a storage part 15, a control part 14 finds and sends out attenuation control data and phase control data while considering the attenuation and phase characteristics of the attenuator 11 and the attenuation and phase characteristics of the phase shifter 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a signal processing apparatus for generating an output signal having a desired signal level and phase from an input signal using an attenuator and a phase shifter. In particular, the present invention relates to a method for acquiring characteristic information for obtaining control data for controlling operations of an attenuator and a phase shifter, and an attenuation / phase control method and a signal processing device using the characteristic information.

[0002]

2. Description of the Related Art It is known to use a circuit having an attenuator and a phase shifter to control the level (attenuation amount) and phase of a signal. For example, a circuit in which an attenuator and a phase shifter are connected in series via an isolator is used to control the signal level and phase of a radio wave radiated from an antenna. In such a circuit, since the phase characteristics of the attenuator affect the phase of the output signal, and the attenuation characteristics of the phase shifter affect the signal level of the output signal, an output signal having a desired signal level and phase can be obtained. Have difficulty. Therefore, conventionally, attenuation control data for controlling the amount of attenuation by the attenuator, phase control data for controlling the amount of phase shift by the phase shifter, and the signal level and phase of the actually output signal Numerical relationships are measured in advance, and each control data is determined based on the measured values.

[0003]

However, in such a conventional method, it is necessary to measure the attenuation control data and the phase control data over the respective numerical ranges.
For example, the attenuation control data is 11 bits (0 to 7FF)
In the case of the digital data, even if the phase control data is fixed, measurement according to 2048 kinds of attenuation control data is required. For this reason, it takes a lot of time and cost to perform measurement over the entire numerical range of each control data in advance. Further, a storage device having a very large storage capacity is required to hold the measured numerical values, and a high-speed processing for generating appropriate attenuation control data and phase control data from these huge numerical values is required. A control unit that can perform the operation is required. In recent years, a circuit including a plurality of attenuators and a phase shifter may be used,
In such a case, the above-mentioned problem becomes more prominent.

Accordingly, an object of the present invention is to provide an attenuation / phase control method using characteristic information for realizing a quick control process with a small amount of labor required for measurement performed in advance, and a signal processing apparatus to which the method is applied. To provide.

[0005]

Means for Solving the Problems A first method for solving the above problems is described below.
An attenuation / phase control method according to the present invention is a method executed in a signal processing apparatus including a first element for attenuating an input signal according to attenuation control data and a second element for shifting a phase of the input signal according to phase control data. A step of sampling and measuring the amount of attenuation of the input signal and the amount of phase shift accompanying the attenuation of the input signal with respect to the first element in accordance with arbitrary attenuation control data; Generating an attenuation characteristic function and a first phase characteristic function; and sampling and measuring a phase shift amount of the input signal shifted according to arbitrary phase control data for the second element and an attenuation amount associated therewith. Generating a second attenuation characteristic function and a second phase characteristic function from the measured values obtained in this step; Obtaining attenuation control data and phase control data for causing an actually input signal to reach a target signal level and a target phase based on the phase characteristic function, the second attenuation characteristic function, and the second phase characteristic function. It is characterized by the following.

According to a second aspect of the present invention, an attenuation / phase control method includes an attenuator for attenuating an input signal in accordance with attenuation control data, and a phase shifter for shifting a phase of the input signal in accordance with phase control data, A method performed in an apparatus for generating an output signal in response to an instruction of a target signal level and a target phase, wherein a first step of obtaining first attenuation control data indicating an amount of attenuation according to the target signal level; When the first attenuation control data is transmitted to the attenuator, a second phase error caused by the phase characteristic of the attenuator is determined.
A step of obtaining first phase control data indicating a phase shift amount corresponding to a phase difference between the target phase and the phase error; and a step of transmitting the first phase control data to the phase shifter. A fourth step of obtaining an attenuation error caused by the attenuation characteristic of the phase shifter; and a second step of indicating an attenuation corresponding to a difference between the target signal level and the attenuation error.
A fifth step of obtaining attenuation control data, wherein when the phase error and the attenuation amount error satisfy predetermined conditions,
Determining the second attenuation control data as attenuation control data for controlling the amount of attenuation by the attenuator, and determining the first phase control data as phase control data for controlling the amount of phase shift by the phase shifter; If the second condition is not satisfied, the second damping control data is used as new first damping control data, and the second damping control data is changed until the second condition is satisfied.
The method is characterized by repeating the fifth step from the step.

In the second attenuation / phase control method, it is preferable that first step obtains first attenuation control data indicating the amount of attenuation according to the attenuation characteristic of the attenuator, and that the third step determines the phase of the phase shifter. The first phase control data indicating the phase shift amount is obtained according to the characteristic, and the fifth step is to obtain the second attenuation control data indicating the attenuation amount according to the attenuation characteristic of the attenuator.

According to a third aspect of the present invention, an attenuation / phase control method includes an attenuator for attenuating an input signal in accordance with attenuation control data, and a phase shifter for shifting a phase of the input signal in accordance with the phase control data. A method performed in an apparatus for generating an output signal in response to an indication of a target signal level and a target phase, wherein a first step of obtaining first phase control data indicating a phase shift amount according to the target phase; A second step of obtaining an attenuation error caused by an attenuation characteristic of the phase shifter when the first phase control data is transmitted to the phase shifter; and an attenuation corresponding to a difference between the target signal level and the attenuation error. A third step of obtaining first attenuation control data indicating an amount, and a third step of obtaining a phase error caused by a phase characteristic of the attenuator when the first attenuation control data is transmitted to the attenuator. And a fifth step of obtaining second phase control data indicating a phase shift amount corresponding to a difference between the first phase and the phase error, wherein the phase error and the attenuation amount error satisfy a predetermined condition. When the first condition is satisfied, the first attenuation control data is determined as attenuation control data for controlling the amount of attenuation by the attenuator, and the second phase control data is phase control data for controlling the amount of phase shift by the phase shifter. When it is determined and the predetermined condition is not satisfied, the second phase control data is used as new first phase control data, and the second to fifth steps are repeated until the predetermined condition is satisfied. It is characterized by.

In this method, it is preferable that first step obtains first phase control data indicating a phase shift amount in accordance with a phase characteristic of the phase shifter, and a third step calculates an attenuation amount in accordance with the attenuation characteristic of the attenuator. The first attenuation control data is obtained, and in a fifth step, the second phase control data indicating the amount of phase shift is obtained according to the phase characteristics of the phase shifter.

In a more preferable aspect of the attenuation / phase control methods of the first to third inventions, the attenuation control is performed in a state where the phase control data is fixed so that the phase shift amount of the phase shifter is set to zero. Changing the data, measuring the signal level and phase of the output signal at this time, generating attenuation characteristic information and phase characteristic information of the attenuator based on the measured value; and With the attenuation of the attenuator fixed to zero, the phase control data is changed, the signal level and the phase of the output signal at this time are measured, and the phase shift is performed based on the measured value. Generating attenuation characteristic information and phase characteristic information of the detector, and using any one of the attenuation characteristic information and the phase characteristic information in each of the first to fifth steps. To.

According to another aspect of the present invention, there is provided a signal processing apparatus comprising: a first element for attenuating an input signal according to attenuation control data; a second element for shifting a phase of the input signal according to phase control data; A first storage means for storing a first attenuation characteristic function indicating an attenuation amount to be attenuated according to arbitrary attenuation control data and a first phase characteristic function indicating a phase shift amount associated with the attenuation; For the two elements, a second attenuation characteristic function indicating a phase shift amount shifted according to arbitrary phase control data and a second attenuation characteristic function indicating a second phase characteristic function indicating an attenuation amount accompanying the shift are stored.
A storage means, and an input signal reaches a target signal level and a target phase according to a first attenuation characteristic function, a first phase characteristic function, a second attenuation characteristic function, and a second phase characteristic function stored in each storage means. Control means for obtaining attenuation control data and phase control data for instructing each of the first and second elements.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a signal processing apparatus to which the present invention is applied will be described with reference to the drawings. The signal processing device here means, for example, a device for controlling a signal level and a phase of a radio wave radiated from an antenna.

<Structure> In the signal processing device 1, the signal level (attenuation) and the phase of the first signal generated by a signal generation device (not shown) are set to target values (signal level and phase) from an instruction unit (not shown). The second signal is generated by controlling the first signal so as to satisfy the following condition, and is sent to an output unit (not shown). The signal processing device 1 includes an attenuator 11, a phase shifter 1,
Two and three isolators 13a, 13b, 13c
And an attenuator 11 and a phase shifter 12
And a storage unit 15 for storing various information. The series circuit has a configuration in which the attenuator 11 is inserted between the isolators 13a and 13b, and the phase shifter 12 is inserted between the isolators 13b and 13c.

The isolators 13a, 13b, 13c
This is a circuit element that performs one-way signal propagation in which the loss of a signal traveling in a predetermined propagation direction is much larger than the loss of a signal traveling in the opposite propagation direction. The isolator 13a propagates the first signal generated by the signal generator to the attenuator 11. The attenuator 11 controls the signal level of the signal sent from the isolator 13a according to the attenuation control data sent from the control unit 14, and sends this to the isolator 13b. The isolator 13b propagates the output signal of the attenuator 11 to the phase shifter 12. The phase shifter 12 controls the phase of the signal sent from the isolator 13 b according to the phase control data sent from the control unit 14, and
Send to c. The isolator 13c propagates an output signal of the phase shifter 12 to an output unit (not shown).

The control unit 14 uses various information stored in the storage unit 15 to obtain attenuation control data and phase control data, which will be described in detail later, and transmits the determined attenuation control data and phase control data to the attenuator 11 respectively. , To the phase shifter 12. FIG. 2 shows a format example of the attenuation control data and the phase control data output from the control unit 14.
In this embodiment, the attenuation control data has a digital data structure of 11 bits, and the phase control data has a digital data structure of 10 bits.

The storage unit 15 holds various information for generating attenuation control data and phase control data. Here, roughly, attenuator characteristic information 151 on the input / output characteristics of the attenuator 11, phase shifter characteristic information 152 on the input / output characteristics of the phase shifter 12, and information 153 on the permissible error are provided.
And are held. Regarding the attenuator 11, the attenuator 1
In this case, attenuation characteristic information 151a indicating the attenuation characteristic of No. 1 and phase characteristic information 151b indicating the phase characteristic are held. As for the phase shifter 12, attenuation characteristic information 152a indicating the attenuation characteristic of the phase shifter 12 and phase characteristic information 152b indicating the phase characteristic are held. As for the allowable error, the attenuation allowable error Ae and the phase allowable error Pe are held.

<Preliminary Measurement> In this embodiment, the attenuator 11
And the attenuation characteristics and phase characteristics of the phase shifter 12 are measured and calculated in advance. These characteristics are such that one of the attenuation control data and the phase control data output from the control unit 14 is fixed, the other control data is changed with a predetermined numerical width, and the signal level of the second signal output from the isolator 13c is changed. And by measuring the phase. Here, as in the conventional case, the measurement is not performed in all possible numerical ranges of each control data, but the sampling measurement is performed with a limited number of measurements. In this embodiment, the signal level and the phase of the second signal corresponding to all possible numerical ranges of each control data are calculated by performing linear interpolation from the result obtained by the sampling measurement.

First, the signal level and the phase of the second signal in the case where the signal level is not changed (the amount of attenuation is not controlled) as the attenuation control data in the attenuator 11 and the amount of attenuation is instructed to be "zero" are relatively determined. Signal level "zero", phase "zero"
Consider Here, the signal level of the second signal when the attenuation control data x is instructed to the attenuator 11 is Aa, and the phase changed accordingly is Pa. Here, the attenuation amount indicated by the attenuation control data x, the signal level Aa of the second signal, and the phase P
3 (a) and 3 (b) show graphs showing the relationship with a.
However, these graphs have been subjected to the above-described linear interpolation processing. The following relational expression is obtained from such a graph.

Aa = Fa (x) (1) Pa = Fp (x) (2)

Next, the phase shifter 12 does not shift the phase as phase control data (the phase shift amount is not controlled).
The signal level and the phase of the second signal when the phase shift amount “zero” is designated are regarded as the signal level “zero” and the phase “zero” relatively. Here, the signal level of the second signal when the phase control data y is instructed to the phase shifter 12 is Ap, and the phase is Pp. Here, FIGS. 4A and 4B are graphs showing the relationship between the amount of phase shift indicated by the phase control data y and the signal level Ap and phase Pp of the second signal. However,
These graphs are also subjected to linear interpolation processing. The following relational expression is obtained from such a graph.

Ap = Ga (y) (3) Pp = Gp (y) (4)

The relational expression obtained in this way is expressed as
Is held in. That is, the relational expression (1) is used as the attenuation characteristic information 151a indicating the attenuation characteristic of the attenuator 11, and the relational expression (2) is used as the phase characteristic information 151b indicating the phase characteristic of the attenuator 11, and the attenuation characteristic of the phase shifter 12 is used. Relational expression (3) is held as attenuation characteristic information 152a shown, and relational expression (4) is held as phase characteristic information 152b showing phase characteristics of phase shifter 12.

<Operation> Next, the operation of the signal processing device 1 will be described. Here, the attenuator 1 for setting the second signal to a target value (signal level is “Ad” and phase is “Pd”)
1 and the control of the phase shifter 12 will be described with reference to FIGS. The storage unit 15 stores the attenuation characteristic information 151a and the phase characteristic information 151b of the attenuator 11 and the attenuation characteristic information 1
52a and the phase characteristic information 152b are already stored.

When the control unit 14 receives a target value with the signal level of the second signal being "Ad" and the phase being "Pd", it firstly obtains the attenuation characteristic information 151a (relational expression (1)).
Attenuation x1 for realizing the signal level Ad of the second signal
(Attenuation amount instructed to the attenuator 11 by the attenuation control data) (FIG. 3A and step S1 in FIG. 5).
01, S102). Here, as described in [Prior Art], the phase characteristic of the attenuator 11 affects the phase of the second signal. Therefore, when the attenuation amount x1 is instructed to the attenuator 11 as attenuation control data, the phase Pa1 shifted by the phase characteristic of the attenuator 11 is determined by the phase characteristic information 151b.
(FIG. 3B and FIG. 5)
Step S103).

This phase Pa1 is converted by the phase shifter 12 into the second
When the control for changing the phase of the signal to the target value “Pd” is performed, a phase error generated in the second signal due to the phase characteristic of the attenuator 11 is shown. Therefore, in this embodiment, the phase difference corresponding to the difference between the target phase Pd and the phase error Pa1 generated in the second signal due to the phase characteristics is determined by the phase shifter 12.
Phase shifter 12 so that the phase shift amount
Control.

Therefore, the controller 14 determines that the phase is "Pd-P
The phase shift amount y1 (the phase shift amount instructed to the phase shifter 12 by the phase control data) to obtain a1 "is obtained from the phase characteristic information 152b (relational expression (4)) (FIG. 4B).
And step S104 in FIG. 5). Again, as described in [Prior Art], the signal level of the second signal is affected by the attenuation characteristic of the phase shifter 12. Therefore, when the phase shift amount y1 is instructed to the phase shifter 12 as the phase control data, the signal level Ap1 that fluctuates due to the attenuation characteristic of the phase shifter 12 is obtained from the attenuation characteristic information 152a (the relational expression (3)). (Step S10 in FIG. 4A and FIG. 5)
5).

When the attenuator 11 controls the signal level of the second signal to the target value "Ad", the signal level Ap1 is converted to the second signal by the attenuation characteristic of the phase shifter 12. This shows the attenuation error that occurs. Therefore, in the next process, the attenuation corresponding to the difference between the target signal level Ad and the attenuation error Ap1 generated in the second signal due to the attenuation characteristic is set to be the attenuation that is varied by the attenuator 11. The attenuator 11 is controlled. Therefore, the control unit 14
An attenuation amount x2 (attenuation amount instructed to the attenuator 11 by the attenuation control data) such that the signal level of the signal becomes "Ad-Ap1" is obtained from the attenuation characteristic information 151a (the relational expression (1)) (step S106). .

In the above processing, after the phase shift amount y1 considering the phase characteristic of the attenuator 11 is obtained, the phase shifter 12
The attenuation amount x2 in consideration of the attenuation characteristics described above is required. However, in detail when these values are obtained, the phase shift amount y1 is a value that takes into account the influence of the phase characteristics of the attenuator 11 when the attenuation control data indicating the attenuation amount x1 is instructed to the attenuator 11. There is a background that the attenuation amount x2 is a value that takes into account the influence of the attenuation characteristic of the phase shifter 12 when the phase shifter 12 is instructed with the phase control data indicating the phase shift amount y1. Therefore, the phase shift amount y1 does not consider the influence of the phase characteristics of the attenuator 11 when the attenuation control data indicating the attenuation amount x2 is instructed to the attenuator 11.

As described above, regarding the influence of the phase characteristic of the attenuator 11 and the attenuation characteristic of the phase shifter 12, when the amount of attenuation or the amount of phase shift is changed in consideration of one of the effects, the other characteristic is changed. An effect appears and both effects cannot be offset simultaneously. Therefore, after step S106,
A phase Pa1 which is an error due to a phase characteristic of the attenuator 11,
It is determined whether the attenuation amount Aa1 which is an error due to the attenuation characteristic of the phase shifter 12 is equal to or less than the attenuation allowable error Ae and the phase allowable error Pe held in advance, that is, whether Pa1 ≦ Pe and Aa1 ≦ Ae. It is determined (step S107).

If the phase Pa1 and the attenuation Aa1 do not satisfy the conditions, the attenuation x2 is replaced with the new attenuation x1.
(Step S108), the process returns to Step S103, and the processes from Step S103 to Step S106 are executed again. Thereby, a new attenuation amount x2 and a new phase shift amount y1 are obtained. A process considering the phase characteristics of the attenuator 11 (steps S103 and S104) and a process considering the attenuation characteristics of the phase shifter 12 (steps S105 and S105).
106) is repeatedly performed, so that the phase Pa1 and the amount of attenuation Aa1 which are errors are reduced, and as a result,
This satisfies the condition in step S107.
If the condition is satisfied (step S107: YES), the control unit 14 sends the attenuation control data indicating the latest attenuation amount x2 to the attenuator 11, and the phase control data indicating the latest phase shift amount y1 to the phase shifter 12. Send (step S109).

The attenuator 11 attenuates the signal sent from the isolator 13a according to the attenuation control data indicating the latest attenuation x2, and the phase shifter 12 adjusts the latest phase shift y
1 in accordance with the phase control data indicating “1”.
Change the phase of the signal sent from. As a result, the second signal output from the signal processing device 1 is a signal as close as possible to the signal level Ad and the phase Pd, which are the target values.

As described above, according to this embodiment, the attenuator 11
Until the error (phase) due to the phase characteristic of (1) and the error (signal level) due to the attenuation characteristic of the phase shifter 12 become equal to or smaller than a predetermined value, the processing according to the phase characteristic of the attenuator 11 The processing according to the characteristics is sequentially performed. As a result, the attenuation control data and the phase control data for the attenuator 11 and the phase shifter 12 can be optimized.

Further, the pre-measurement performed in this embodiment is not performed over the entire numerical range of each control data, but is performed at a predetermined interval, thereby reducing the processing required for the pre-measurement as compared with the conventional case. can do.
Further, the measured results are stored as mathematical expressions and data as the attenuation characteristics and phase characteristics of the attenuator 11 and the attenuation characteristics and phase characteristics of the phase shifter 12, so that the memory capacity is reduced and the above-described processing is performed quickly. It becomes possible to execute. When the data is held as data, by searching this, the above-described attenuation amount x, phase shift amount y,
Alternatively, Aa, Pa, Ap, and Pp are obtained.

In this embodiment, one cycle is to perform processing in consideration of the phase characteristic of the attenuator 11 and then perform processing in consideration of the attenuation characteristic of the phase shifter 12. The same effect can be obtained even if it is reversed.

In this embodiment, a signal processing device having one attenuator and one phase shifter has been described. However, the present invention is also applied to a signal processing device having a plurality of attenuators and phase shifters. Can be applied. In this case, in the pre-measurement, if each attenuator or each phase shifter has the same characteristic (same standard), the measurement is not performed for each attenuator or phase shifter. What is necessary is just to measure the attenuation characteristic and the phase characteristic of the device. However, in the process of generating control data, a process according to the number of attenuators and the number of phase shifters is required.

[0036]

As is apparent from the above description, according to the present invention, the labor required for the measurement performed in advance is reduced,
It is possible to provide an attenuation / phase control method using characteristic information for realizing a quick control process, and a signal processing device to which the method is applied.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a signal processing device according to an embodiment of the present invention.

FIG. 2 is a format example of attenuation control data and phase control data output from a control unit of the signal processing device.

FIG. 3 is a graph showing an attenuation characteristic and a phase characteristic of an attenuator held in a control unit of the signal processing device.

FIG. 4 is a graph showing attenuation characteristics and phase characteristics of a phase shifter held in a control unit of the signal processing device.

FIG. 5 is a procedure explanatory diagram for explaining the operation of the signal processing device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 signal processing device 11 attenuator 12 phase shifter 13 a to 13 c isolator 14 control unit 15 storage unit 151 attenuator characteristic information 152 phase shifter characteristic information 153 tolerance error information

Claims (7)

[Claims] 1. A method performed in an apparatus comprising: a first element for attenuating an input signal according to attenuation control data; and a second element for shifting a phase of the input signal according to phase control data, the first element comprising: Sampling and measuring the amount of attenuation of the input signal attenuated in accordance with arbitrary attenuation control data and the amount of phase shift associated therewith; and a first attenuation characteristic function and a first attenuation characteristic from the measured values obtained in this step. Generating a phase characteristic function; sampling and measuring a phase shift amount of the input signal shifted according to arbitrary phase control data with respect to the second element and an associated attenuation amount; Generating a second decay characteristic function and a second phase characteristic function from the measured values, the first decay characteristic function and the first phase characteristic Calculating attenuation control data and phase control data for causing an actually input signal to reach a target signal level and a target phase based on the number, the second attenuation characteristic function, and the second phase characteristic function. Characteristic attenuation / phase control method. 2. An attenuator for attenuating an input signal in accordance with attenuation control data, and a phase shifter for shifting a phase of the input signal in accordance with phase control data, according to an instruction of a target signal level and a target phase. A first step of obtaining first attenuation control data indicating an amount of attenuation according to the target signal level; and transmitting the first attenuation control data to the attenuator. A second step of obtaining a phase error caused by a phase characteristic of the attenuator when transmitting; and a third step of obtaining first phase control data indicating a phase shift amount corresponding to a phase difference between the target phase and the phase error. A fourth step of obtaining an attenuation error caused by an attenuation characteristic of the phase shifter when the first phase control data is transmitted to the phase shifter; A second attenuation control data indicating an attenuation amount corresponding to a difference between the phase error and the attenuation amount error, wherein the phase error and the attenuation amount error satisfy a predetermined condition, (2) The attenuation control data is determined as attenuation control data for controlling the amount of attenuation by the attenuator, and the first phase control data is determined as phase control data for controlling the amount of phase shift by the phase shifter. Is not satisfied, the second damping control data is replaced with a new first damping control data.
A method for controlling attenuation / phase, wherein the second step to the fifth step are repeated until the predetermined condition is satisfied as attenuation control data. 3. The first step obtains first attenuation control data indicating an amount of attenuation according to an attenuation characteristic of the attenuator, and the third step includes a step of determining an amount of phase shift according to a phase characteristic of the phase shifter. 3. The attenuation / phase control method according to claim 2, wherein one phase control data is obtained, and the fifth step obtains second attenuation control data indicating an attenuation amount according to an attenuation characteristic of the attenuator. 4. An attenuator for attenuating an input signal in accordance with attenuation control data, and a phase shifter for shifting a phase of the input signal in accordance with phase control data, according to an instruction of a target signal level and a target phase A first step of obtaining first phase control data indicating a phase shift amount according to the target phase, wherein the first phase control data is obtained by the phase shifter. A second step of obtaining an attenuation error caused by the attenuation characteristic of the phase shifter when the transmission is performed, and obtaining first attenuation control data indicating an attenuation corresponding to a difference between the target signal level and the attenuation error. A third step of: calculating a phase error caused by a phase characteristic of the attenuator when the first attenuation control data is transmitted to the attenuator; A fifth step of obtaining second phase control data indicating a phase shift amount corresponding to a difference from the phase error, wherein the first attenuation is performed when the phase error and the attenuation error satisfy a predetermined condition. The control data is determined as attenuation control data for controlling the amount of attenuation by the attenuator, and the second phase control data is determined as phase control data for controlling the amount of phase shift by the phase shifter. If not, the second phase control data is replaced with a new first phase control data.
A method for controlling the amount of attenuation and phase, wherein the second step to the fifth step are repeated as phase control data until the predetermined condition is satisfied. 5. The method according to claim 1, wherein the first step obtains first phase control data indicating a phase shift amount according to a phase characteristic of the phase shifter, and the third step includes a step of determining an attenuation amount according to an attenuation characteristic of the attenuator. 1 Attenuation control data is obtained, and the fifth step is based on a phase characteristic of the phase shifter.
5. The attenuation / phase control method according to claim 4, wherein second phase control data indicating a phase shift amount is obtained. 6. The attenuation control data is changed while the phase control data is fixed so that the phase shift amount of the phase shifter is zero, and the signal level and phase of the output signal at this time are measured. Generating attenuation characteristic information and phase characteristic information of the attenuator based on the measured value; andamplifying the attenuation control data so that the attenuation amount of the attenuator is zero. Change the control data,
Measuring a signal level and a phase of the output signal at this time, and generating attenuation characteristic information and phase characteristic information of the phase shifter based on the measured value. 6. The attenuation / phase control method according to claim 2, wherein each of the five steps uses one of the attenuation characteristic information and the phase characteristic information. 7. A first element for attenuating an input signal according to attenuation control data, a second element for shifting a phase of the input signal according to phase control data, and for the first element according to arbitrary attenuation control data. A first storage unit storing a first attenuation characteristic function indicating an attenuation amount to be attenuated, and a first phase characteristic function indicating a phase shift amount due to the attenuation; and, for the second element, arbitrary phase control data. A second damping characteristic function indicating a phase shift amount to be shifted in accordance with the first and second phase characteristic functions indicating a damping amount associated with the shift; Attenuation control data and phase for causing an input signal to reach a target signal level and a target phase according to an attenuation characteristic function, a first phase characteristic function, a second attenuation characteristic function, and a second phase characteristic function. Seek control data, and a control means for instructing them to each of the first element and the second element, the signal processing device.