CN111049493B

CN111049493B - Vector sky tone fast tuning method

Info

Publication number: CN111049493B
Application number: CN201911139361.3A
Authority: CN
Inventors: 罗磊; 邹晶晶
Original assignee: CETC 30 Research Institute
Current assignee: CETC 30 Research Institute
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2022-03-18
Anticipated expiration: 2039-11-20
Also published as: CN111049493A

Abstract

The invention discloses a fast tuning method for vector antenna tuning, which comprises the steps of carrying out blind area detection and judgment if the inductance requirement is a negative value in the process of inductance calculation iterative correction during tuning of a main tuning area, stopping tuning of the main tuning area when a device blind area is detected, and starting tuning of the main tuning area after a coarse tuning device is readjusted. Compared with the prior art, the invention has the following positive effects: by providing the blind area detection method, the invention can effectively avoid overlong frequency point tuning time with larger device error, improve tuning efficiency, effectively reduce the maximum tuning time of first tuning, improve tuning success rate and play a certain role in prolonging the service life of the antenna tuner.

Description

Vector sky tone fast tuning method

Technical Field

The invention relates to a vector sky tone fast tuning method.

Background

The vector antenna tuner configures the matching network in accordance with accurate impedance detection. Typically comprising two parts, a coarse tuning network (responsible for transforming the load point into the tunable region) and a main tuning network (responsible for fine tuning). The coarse tuning network is mainly used for matching the fine tuning network to the tunable area, and the main tuning network is used for realizing fine matching of the tuning network. After the coarse tuning network is adjusted to the tunable area, theoretically, the main tuning network can calculate the required impedance network in one step only according to the detected target impedance value to complete the adaptation of the antenna, but in practical engineering application, antenna tuning devices such as an inductance and a capacitance are not ideal devices, printed circuit board wiring is not ideal interconnection lines, and errors are inevitably caused. Small errors can be corrected and calibrated to slightly affect tuning efficiency, while large errors can lead to poor tuning results and even tuning failures. Since the precision of the inductive device is lower than that of the capacitor, larger errors are more easily generated.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a vector sky tone fast tuning method, and the influence of the error of an inductance device on a tuning result is evaluated in advance through a blind area detection method, so that the tuning efficiency of a main tuning network is improved, the follow-up invalid matching network correction is avoided, and the tuning efficiency is improved.

The technical scheme adopted by the invention for solving the technical problems is as follows: a fast tuning method for vector antenna tuning is characterized in that when tuning of a main tuning area is carried out, if the inductance requirement is a negative value in the process of iterative correction of inductance calculation, blind area detection and judgment are carried out, when a device blind area is detected, the tuning of the main tuning area is stopped, a coarse tuning device is readjusted, and then the tuning of the main tuning area is started.

Further, the method for detecting and judging the blind area comprises the following steps: and when the situation that the impedance change is not in accordance with the expectation after a large inductor replaces a plurality of small inductors in the added inductors exists in the iterative correction process, judging that the device blind area is met.

Further, the method for detecting and judging the blind area comprises the following steps: in the initial inductance increasing process, if the situation that the inductance which needs to be added after a large inductance replaces a plurality of small inductances is negative is detected, the device dead zone is determined to be met.

Further, the method for detecting and judging the blind area comprises the following steps: if more inductors are required to be added during detection before the large inductor replaces a plurality of small inductors, and the added inductors are excessive during detection after the large inductor replaces the small inductors, the dead zone of the device is determined to be met.

Further, the iterative correction process includes two cases: firstly, gradually increasing the inductance to enable the impedance value to gradually approach an impedance circle; secondly, the impedance value exceeds the impedance circle after the inductance is added in a certain step, and a part of the inductance needs to be adjusted and reduced, so that the impedance value reaches the impedance circle.

Further, when configuring the impedance network, the impedance network is digitally quantized with the minimum unit inductance and capacitance as the value 1, and then the device value is increased step by step in a multiplication manner.

Compared with the prior art, the invention has the following positive effects:

by providing the blind area detection method, the invention can effectively avoid overlong frequency point tuning time with larger device error, improve tuning efficiency, effectively reduce the maximum tuning time of first tuning, improve tuning success rate and play a certain role in prolonging the service life of the antenna tuner.

Drawings

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of an ideal tuning process;

FIG. 2 is a general process of iterative correction;

FIG. 3 is another common process for iterative correction;

FIG. 4 is a schematic diagram of a device dead zone;

FIG. 5 is a graph of an impedance change when a blind region is present;

fig. 6 shows another impedance change in the presence of a blind spot.

Detailed Description

A vector sky tone fast tuning method comprises the following steps:

the main tuning network matching process is shown in fig. 1, ideally by the current impedance value Z_aThe added inductance is calculated and the impedance value can be pulled to the capacitance matching circle (point a in the figure). Recalculating the matched capacitance to Z₀The impedance matching can be completed by the point.

Main tuning network error and iterative correction: the coarse tuning network has low requirements on the precision of devices, and errors mainly occur in the main tuning network. The factors causing the error mainly include device errors, parasitic parameters, external rings and the like, and the factors are often unavoidable. The correction is usually performed by iterative calculation. When the inductance is calculated, the idea of carrying out iterative correction calculation is as follows: and taking the impedance value after the previous inductor addition as initial impedance, continuing to calculate the inductor matching, repeating for many times, and continuously adjusting the given inductance value until the impedance value reaches a capacitor matching circle. Two situations generally occur:

one case is to increase the inductance step by step so that the impedance value gradually approaches the impedance circle, as shown in fig. 2.

Secondly, the impedance value exceeds the impedance circle after the inductance is added in a certain step, and a part of the inductance needs to be adjusted and reduced, so that the impedance value reaches the impedance circle. As shown in fig. 3.

When the antenna tuning impedance network is designed, the device value is generally increased step by step in a multiplication mode, and the network coverage of all impedances is realized. During software design, the impedance network can be digitally quantized with the minimum unit inductance and capacitance as the value 1, for example, the device value is (1,2,4,6 … 32), that is, any impedance network with the value 0 to 63 can be configured. However, when a device with a larger value has an error, for example, when a plurality of small inductors are replaced by large inductors, impedance abrupt change sometimes occurs, for example, when the quantized inductor is increased from 0x7f to 0x80, theoretically, only once minimum unit inductance increase is performed, but actually, 7 inductors with different sizes are replaced by one large inductor, and due to the error, the increased value may be far greater than the quantized value 1, which may cause a larger dead zone. A simplified device value distribution schematic is shown in fig. 4.

When the target matching point is at the blind area position, two impedance changes in the blind area occur as shown in fig. 5 and 6 because tuning fails because the ideal value cannot be matched all the time.

When two situations of fig. 5 and fig. 6 occur in the iterative correction process, if there is a situation that a large inductor replaces a plurality of small inductors in the added inductors, it can be basically determined that a blind zone is encountered.

To simplify the decision conditions, it can be decided during the initial inductance increase:

1. the inductance that needs to be added for detection after the inductance is configured is a negative value.

2. There is a large inductance instead of a plurality of small inductances.

In order to avoid misjudgment of the optimal tuning value when the optimal tuning value appears at the blind area edge, the blind area edge is detected. And if the large inductor replaces a plurality of small inductors, more inductors are required to be added for detection, and after the small inductors are replaced by the large inductors, the added inductors are detected to be excessive. The tuning of the main tuning area is stopped when the device blind area is met, and the tuning of the main tuning area is restarted after the coarse tuning device is adjusted.

Claims

1. A vector sky tone fast tuning method is characterized in that: when tuning of a main tuning area is carried out, if the inductance requirement is a negative value in the process of inductance calculation iterative correction, blind area detection and judgment are carried out, when the situation that the device blind area is met is detected, the tuning of the main tuning area is stopped, a coarse tuning device is adjusted again, and then the tuning of the main tuning area is started; wherein: the blind area detection and judgment method comprises the following steps: when the situation that a large inductor replaces a plurality of small inductors and the impedance change is opposite to the expected impedance change exists in the added inductors in the iterative correction process, the device dead zone is judged to be met.

2. The method of claim 1, wherein the vector pitch fast tuning method comprises: the blind area detection and judgment method comprises the following steps: in the initial inductance increasing process, if the situation that the inductance which needs to be added after a large inductance replaces a plurality of small inductances is negative is detected, the device dead zone is determined to be met.

3. The method of claim 2, wherein the vector pitch fast tuning method comprises: the blind area detection and judgment method comprises the following steps: if more inductors are required to be added during detection before the large inductor replaces a plurality of small inductors, and the added inductors are excessive during detection after the large inductor replaces the small inductors, the dead zone of the device is determined to be met.

4. The method of claim 1, wherein the vector pitch fast tuning method comprises: the iterative correction process includes two cases: firstly, gradually increasing the inductance to enable the impedance value to gradually approach an impedance circle; secondly, the impedance value exceeds the impedance circle after the inductance is added in a certain step, and a part of the inductance needs to be adjusted and reduced, so that the impedance value reaches the impedance circle.

5. The method of claim 1, wherein the vector pitch fast tuning method comprises: when the impedance network is configured, the impedance network is digitally quantized by taking the minimum unit inductance and capacitance as the value 1, and then the device value is gradually increased in a multiplication mode.