JPH11183544A - Radio wave environment simulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio wave environment simulator which can faithfully reproduce radio wave environment in a field to receiving equipment for a radio wave indoors and permits an effective test of the receiving equipment. SOLUTION: An RF(Radio frequency signal) received in a field and a control signal controlling the reception state of the RF signal are obtained by field receiving equipment 10b which has partially the same function with receiving equipment 10a as a body A to be tested. A recording means 13 performs AD conversion of the RF signal and control signal obtained by the field receiving equipment 10b and records the converted signals on a recording medium 14. A reproducing means 17 is loaded with the recording medium 14, reads its data out, and converts the data from digital into analog to reproduce the RF signal and control signal, which are supplied to the receiving equipment 10a as the body A to be tested.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave environment simulator for reproducing a radio wave environment in a field for a radio wave receiving device.

[0002]

2. Description of the Related Art Conventionally, indoor tests have been performed on radio wave receiving devices before operation thereof. In this indoor test, a test radio wave or a test signal is generated by a radio wave simulator and supplied to a receiving device serving as a test object to perform various operation tests.

FIG. 10 shows a configuration of a radio wave simulator 6 conventionally used in an indoor test, and a test form for a receiving device 10a as a specimen A. In the figure, 1
Is an RF signal generator for generating an RF (Radio Frequency) signal, 2 is a pulse generator, 3 is a radar simulator, 4 is a switch, and 5 is a test antenna, and these constitute a radio simulator 6. Also, in the figure, 7 is an antenna unit, 8 is a receiver unit, 9 is a control and processing unit that controls the receiving state of the receiver unit 8, and these constitute a receiving device 10 a as a specimen A Is done.

[0004] A test mode of the specimen A using the radio wave simulator 6 will be described below. First, based on the contents of the indoor test, specifications for testing the operation of the specimen A are set in the RF signal generator 1, the pulse generator 2, and the radar simulator 3, and a test signal is generated. This test signal is provided to the test antenna 5 via the switch 4 and is radiated as radio waves toward the antenna unit 7 of the receiving device 10a.

When the test signal generated by the radio wave simulator 6 is supplied to the receiving device 10a not as a radio wave but as an RF signal, the test antenna 5 is not used and the switch 4 is connected to the receiving device 10a via a cable (not shown). Receiving device 10a
Is directly given to the receiver unit 8.

[0006] The receiving device unit 8 of the receiving device 10a performs a predetermined process on an RF signal obtained by receiving radio waves by the antenna unit 7 or an RF signal directly supplied from the switch 4 via a cable. The control / processing unit 9 controls the receiving state of the receiving unit 8 such as a receiving band.

[0007] As described above, the test signal generated by the radio simulator 6 is given to the specimen A as a radio wave or an RF signal, and an indoor test is performed on the receiving device 10a serving as the specimen A.

[0008]

In the field where the above-mentioned receiving device 10a is actually operated, the received waveform is affected by the influence of the surrounding terrain or the interference with an external wave, thereby causing the received waveform to change. It is not always well-ordered and produces distortion.

However, the above-described radio wave simulator 6
According to the method described above, since the number of test signals that can be generated simultaneously is limited, it is difficult to reflect the above-described distortion of the received waveform in a test radio wave or an RF signal, and faithfully reproduce a radio wave environment in a field. It is not possible. For this reason, even if the receiving device operates satisfactorily in the indoor test, operation failure may occur in the field, and there is a problem in that the receiving device cannot be effectively tested.

The present invention has been made in view of such a problem, and faithfully reproduces a radio wave environment in a field for a radio wave receiving device indoors, thereby enabling an effective test for the receiving device. It is an object to provide a radio wave environment simulator.

[0011]

Means for Solving the Problems The present invention has the following arrangement to achieve the above object. That is, the present invention is a receiving device serving as a test object, at least a part of the receiving device serving as the test device is the same receiving device, the RF (Radio Frequency) signal received in the field and the RF signal A field receiving device for obtaining a control signal for controlling a reception state, recording means for A / D converting the RF signal and the control signal obtained by the field receiving device and recording the converted signal on a recording medium; It has a configuration including reading means for reading data recorded on a recording medium, D / A converting the data, reproducing the RF signal and the control signal, and supplying the reproduced RF signal and the control signal to a receiving device serving as the specimen.

The recording means includes an A / D converter for A / D converting the RF signal and the control signal to obtain data in a predetermined format, and an A / D converter obtained by the A / D converter. A data recording unit for recording data on the recording medium, wherein the reproducing unit reproduces the data from the recording medium; and performs D / A conversion on the data reproduced by the data reproducing unit. And a D / A converter for obtaining the RF signal and the control signal.

Further, the recording means and the reproducing means have a configuration incorporated in the same housing.

Further, the field receiving device also serves as the receiving device serving as the test sample, and the recording means has a configuration incorporated in the test sample.

Further, the field receiving device has a rotating antenna part whose receiving direction is rotatable, and a rotation control unit that controls the rotation of the receiving direction of the rotating antenna part, and is the specimen. It has a configuration in which some functions are the same for the rotating antenna part of the receiving device.

Further, the field receiving device has a fixed antenna unit having a fixed receiving direction.
It has a configuration in which some functions are the same with respect to the fixed antenna part of the receiving device serving as the test sample.

Further, the field receiving device includes a plurality of fixed antenna units each having a fixed receiving direction, an RF switching unit for switching a plurality of RF signals respectively received by the plurality of fixed antenna units, A switching control unit that controls switching of the plurality of RF signals by the RF switching unit.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below by taking, as an example, a case where a radio wave environment in a field for a receiving device 10a serving as a specimen A is reproduced. In each drawing, common elements are denoted by the same reference numerals,
A duplicate description will be omitted.

Embodiment 1 FIG. 1 shows the configuration of the radio wave environment simulator according to the first embodiment. In the figure, reference numeral 10a denotes a receiving device serving as a test object A, and 10b denotes a receiving device having at least a part of the same function as the receiving device 10a serving as a test object A. The RF signal received in the field and the RF signal A field receiving device 13 for obtaining a control signal for controlling the receiving state of the radio wave recording device 13 for A / D converting the RF signal and the control signal obtained by the field receiving device 10b and recording the converted signal on a recording medium 14 (Recording means) and 17 read data recorded on the recording medium 14 by the radio wave recording device 13 and D / A convert the data to reproduce the RF signal and the control signal.
(Reproduction means).

The field receiving device 10b, which is a receiving device having at least a part of the same function as the sample A, has the same configuration as the sample A. Therefore, in the first embodiment, the field receiving device 10b is configured to have the same function as the specimen A.

Further, 11 is a field receiving device 1
A / D converter 12 for A / D converting the RF signal and the control signal from 0b to obtain data of a predetermined format, the A / D converter 12 converts the data obtained by the A / D converter 11 into the recording medium 1
The A / D converter 11 and the data recorder 12 constitute a radio wave recorder 13.

Further, 15 is a data reproducing unit for reproducing the data from the recording medium 14, and 16 is a D / A converter for the data reproduced by the data reproducing unit 15 to perform R / A conversion.
The data reproducing unit 15 and the D / A converting unit 16 are a D / A converting unit that obtains an F signal and a control signal.

The operation of the radio wave environment simulator according to this embodiment will be described below. First, the field receiving device 10b is installed in the field of the radio wave environment to be reproduced with respect to the specimen A, and the radio wave recording device 13 is connected thereto. A recording medium 14 is detachably mounted on the data recording section 12 of the radio wave recording device 13.

The field receiving device 10b receives radio waves in the field via its antenna unit 7, and outputs an RF signal and a control signal. The A / D converter 11 of the radio wave recording device 13 converts the RF signal and the control signal from the field receiving device 10b into an A / D signal according to a so-called sampling theorem.
After the / D conversion, data format conversion is performed to obtain data in a predetermined format.

This data is, for example, as shown in FIG. 2, an 8-bit RF signal obtained by A / D converting an RF signal.
The data area of the data and the data areas of the antenna azimuth (reception azimuth) data, receiver band data, and other status data obtained by A / D conversion of the control signal are 1
It has a predetermined format in which the data length is configured. That is, the data in the predetermined format includes, in addition to the RF signal in the field, information on the receiving direction and the receiving band from which the RF signal was obtained, and information necessary for reproducing the radio wave environment in the field. Having.

Next, the data recording unit 12 converts the data from the A / D conversion unit 11 into a magnetic signal and records it on a recording medium 14 made of a magnetic tape. The recording medium 14
The recording medium is not limited to a magnetic tape and may be of any recording format as long as it can be detachably attached to the data recording unit 12 and has portability.
May be configured to perform a recording operation according to the recording format of the recording medium 14.

Next, the recording medium 14 on which the data is recorded is removed from the data recording unit 12, and the specimen A at the indoor test site is
Is attached to the radio wave reproducing device 17 connected to. The data reproducing unit 15 of the radio wave reproducing device 17 reads data from the recording medium 14 and supplies the data to the D / A converter 16. The D / A converter 16 converts the data from the data reproducer 15 into an A / D
A data format conversion reverse to that of the conversion unit 11 is performed to
/ A conversion, reproduces the RF signal and the control signal, and gives this to the specimen A.

As described above, the RF signal and the control signal in which the radio wave environment in the field is faithfully reflected are given to the specimen A, and the radio wave environment in the field is faithfully reproduced and the receiving apparatus 10a which becomes the specimen A is provided. The test is performed.

Embodiment 2 Next, a second embodiment of the present invention will be described. FIG. 3 shows the configuration of the radio wave environment simulator according to the second embodiment. The radio wave environment simulator shown in the same figure has a configuration in which the radio wave recording device 13 and the radio wave reproduction device 17 are different from the configuration of the first embodiment shown in FIG.
A radio wave recording / reproducing device 18 is provided in the same housing.

That is, in FIG. 3, reference numeral 19 denotes a data converter, which comprises the A / D converter 11 and the D / A converter 16 shown in FIG. Reference numeral 20 denotes a recording / reproducing unit, and the data recording unit 12 and the data reproducing unit 1 shown in FIG.
And 5. Further, 21 is a recording / reproducing unit 2
0 is the recording medium mounted. The recording medium 21 is shown in FIG.
May be removable and portable like the recording medium 14 described above, or may be a built-in recording / reproducing unit 20.

The operation of the radio wave environment simulator according to the second embodiment will be described below. Radio wave recording / reproducing device 18
The data conversion unit 19 receives the RF signal and the control signal from the field receiving device 10b, and inputs the RF signal and the control signal shown in FIG.
It operates in the same manner as the D converter 11 and outputs data in a predetermined format. The recording / reproducing unit 20 operates in the same manner as the data recording unit 12 shown in FIG. 1, and records the data from the data conversion unit 19 on the recording medium 21.

Next, the radio wave recording / reproducing device 18 is detached from the field receiving device 10b and connected to the specimen A at the indoor test site. The recording / reproducing unit 20 of the radio wave recording / reproducing device 18 operates similarly to the data reproducing unit 15 shown in FIG.
The data is reproduced from the recording medium 21 and provided to the data conversion unit 19. The data conversion unit 19 performs the above-described D / A shown in FIG.
It operates in the same manner as the conversion unit 16 to reproduce an RF signal and a control signal from the data reproduced by the recording / reproduction unit 20,
This is given to specimen A. As described above, the radio wave environment in the field is faithfully reproduced indoors, and the test is performed on the receiving device 10a serving as the specimen A.

Embodiment 3 Next, a third embodiment of the present invention will be described. FIG. 4 shows the configuration of the radio wave environment simulator according to the third embodiment. In the radio wave environment simulator shown in FIG. 3, the field receiving device 10b constitutes the receiving device 23 which also serves as the above-mentioned sample A and serves as the sample B in the configuration of the first embodiment shown in FIG. The radio wave recording device 13 (recording means) is characterized in that it is built in the specimen B.

By incorporating the radio wave recording device 13 in the specimen B in this way, it is possible to sequentially record the radio wave environment in the field for the receiving apparatus 23 after the operation of the receiving apparatus 23 serving as the specimen B. Become.

Embodiment 4 FIG. Next, a fourth embodiment of the present invention will be described. FIG. 5 shows the configuration of the radio wave environment simulator according to the fourth embodiment. The radio wave environment simulator shown in FIG. 8 has the configuration of the third embodiment shown in FIG. 4 and a radio wave / recording / reproducing unit 20 shown in FIG. Part 2
4 is provided, and the radio wave / recording / reproducing unit 24 is built in the specimen C.

As described above, the radio wave recording / reproducing unit 2
4, the receiving device 25 serving as the specimen C
After the operation, the radio wave environment in the field for the receiving device 25 is sequentially recorded, and the radio wave environment in a certain time zone can be reproduced if necessary.

Embodiment 5 Next, a fifth embodiment of the present invention will be described. FIG. 6 shows the configuration of the radio wave environment simulator according to the fifth embodiment. The configuration of the radio wave environment simulator shown in FIG. 1 is that a part of the function is the same with respect to the rotating antenna of a specimen (not shown).

That is, in the radio wave environment simulator according to the fifth embodiment, in the configuration of the first embodiment shown in FIG. 1, the receiving direction (antenna direction) can be rotated instead of the field receiving device 10b. And the same rotating antenna unit 26 as the specimen (not shown) and the rotating antenna unit 2
6, a field control device (not shown) including a rotation control unit 27 for controlling the rotation of the reception direction of the antenna 6. The rotation antenna unit 26, the rotation control unit 27, the A / D conversion unit 11, and the data recording unit 12 Are provided as the radio wave recording device 28.

The A / D converter 11 of the radio wave recording device 28
The RF signal received in the field by the rotating antenna unit 26 and the control signal output by the rotation control unit 27 for controlling the rotation of the rotating antenna unit 26 are converted into data in a predetermined format, and are converted into data in the data recording unit 12. Is the recording medium 14
To record. Thereafter, the recording medium 14 on which the data is recorded
Is attached to the radio wave reproducing device 17 shown in FIG. 1 which is detached from the radio wave recording device 28 and connected to a test object (not shown) in the indoor test site, and reproduces the RF signal and the control signal.

Therefore, according to the radio wave environment simulator according to the fifth embodiment, the same RF signal as that of the specimen is obtained by the rotating antenna 26 and the rotation control unit 27.
The receiving azimuth of the rotating antenna 26 can be obtained by the control signal from. These are recorded on the recording medium 14 as data for reproducing the radio wave environment.

Embodiment 6 FIG. Next, a sixth embodiment of the present invention will be described. FIG. 7 shows the configuration of the radio wave environment simulator according to the sixth embodiment. The radio wave environment simulator according to the sixth embodiment shown in FIG. 6 differs from the configuration of the fifth embodiment shown in FIG. 6 in that the A / D converter 11 and the data recording unit 12 are replaced with the data shown in FIG. Conversion unit 1
9 and a recording / reproducing unit 20, and a rotating antenna unit 26, a rotation control unit 27, a data conversion unit 19, and a recording / reproducing unit 20 are provided as a radio wave recording / reproducing device 29.

The radio wave recording / reproducing device 29 converts the RF signal received in the field by the rotating antenna 26 and the control signal of the rotation control unit 27 into data of a predetermined format and records the data on the recording medium 14. Thereafter, the radio wave recording / reproducing device 29 is carried into an indoor test site, connected to a test sample (not shown), reads data from the recording medium 14, reproduces an RF signal and a control signal, and converts the RF signal and the control signal into data.
From the receiving device (not shown).

Embodiment 7 FIG. Next, a seventh embodiment of the present invention will be described. FIG. 8 shows the configuration of the radio wave environment simulator according to the seventh embodiment. The radio wave environment simulator according to the seventh embodiment shown in FIG. 7 has a configuration in which the receiving direction is fixed instead of the rotating antenna 26 and the rotation control unit 27 in the configuration of the sixth embodiment shown in FIG. It has the same fixed antenna unit 30 as a sample (not shown), and includes a fixed antenna unit 30, a data conversion unit 19, and a recording / reproducing unit 20 as a radio wave recording / reproducing device 31.

The seventh embodiment operates in the same manner as the sixth embodiment except that only the RF signal from the fixed antenna unit 30 having a fixed receiving direction is processed and reproduced. However, since the control signal for controlling the reception state is not processed, it is possible to reproduce the radio wave environment under the condition that the reception state such as the reception direction and the reception band is fixed. Although not shown, an element for generating a control signal for controlling the reception state may be added to reproduce a radio wave environment in which the reception state is reflected.

Embodiment 8 FIG. Next, an eighth embodiment of the present invention will be described. FIG. 9 shows a configuration of a radio wave environment simulator according to the eighth embodiment. The radio environment simulator according to the eighth embodiment shown in FIG. 8 is different from the configuration of the seventh embodiment shown in FIG. 8 in that a plurality of fixed antenna units each having a fixed receiving direction are used instead of the fixed antenna unit 30. 32a, 32b, 32c and a plurality of fixed antennas 3
2a, 32b, 32c, the plurality of RFs respectively received
RF switching section 33 for switching signals, and switching control section 3 for controlling switching of a plurality of RF signals by RF switching section 33
4 and the plurality of fixed antennas 32a, 32
b, 32c, an RF switching unit 33, and a switching control unit 34 as a radio wave recording / reproducing device 35.

According to the eighth embodiment, the switching control unit 34
Under the above control, the RF signals respectively received by the plurality of fixed antenna units 32a to 32c having the fixed receiving directions are switched by the RF switching unit 33, and the above-described seventh embodiment is performed.
The same processing is performed.

However, in the eighth embodiment, the control signal from the switching control unit 34 can specify which fixed antenna unit the RF signal received is to be processed, and this control signal The reception status can be known from. Therefore, the radio wave recording / reproducing device 35
The control signal from the switching control unit 34 is converted into data of a predetermined format together with the RF signal from the control unit 3 and recorded on the recording medium 14 as data for reproducing the radio wave environment.

Thereafter, the radio wave recording / reproducing device 35 is carried into an indoor test site and connected to a specimen (not shown).
The data is read from the recording medium 14 to reproduce the RF signal and the control signal, and the reproduced signal is supplied from the data converter 19 to the specimen.

[0049]

As is clear from the above description, according to the present invention, the following effects can be obtained. That is,
According to the present invention, a receiving device serving as a test object, a receiving device having at least a part of the same function as the receiving device serving as the test object, and RF (Radio Frequencnc) received in a field.
y) A field receiving device that obtains a signal and a control signal for controlling a reception state of the RF signal, and the RF signal and the control signal obtained by the field receiving device are A
Recording means for performing D / A conversion and recording on a recording medium, and reading data recorded on the recording medium and converting the data into D / A
A reproducing means for reproducing the RF signal and the control signal by converting the RF signal and the control signal and providing the RF signal and the control signal to the receiving device serving as the specimen, so that the radio wave environment in the field for the receiving device can be faithfully reproduced indoors. Thus, an effective test can be performed on the receiving device.

The recording means includes an A / D converter for A / D converting the RF signal and the control signal to obtain data of a predetermined format, and an A / D converter obtained by the A / D converter. A data recording unit for recording data on the recording medium, wherein the reproducing unit reproduces the data from the recording medium; and performs D / A conversion on the data reproduced by the data reproducing unit. And a D / A converter for obtaining the RF signal and the control signal.
The RF signal received in the field and the control signal for controlling the receiving state can be A / D converted and recorded and reproduced as data in a predetermined format.

Further, since the recording means and the reproducing means are built in the same housing, the hardware constituting the recording means and the reproducing means can be shared, and the cost of the apparatus can be reduced. be able to.

Further, the field receiving device also serves as the receiving device serving as the test sample, and the recording means is built in the test sample, so that an opportunity to record the radio wave environment of the receiving device in the field is provided. Can be increased.

Further, the field receiving device includes a rotating antenna unit whose receiving direction can be rotated, and a rotation control unit that controls the rotation of the receiving direction of the rotating antenna unit. Since some functions are the same for the rotating antenna of the receiving device, the radio wave environment in the field for the receiving device having the rotating antenna can be recorded without installing the receiving device itself in the field.

Further, the field receiving device has a fixed antenna having a fixed receiving direction,
Since the functions of the fixed antenna of the receiving device to be tested are partially the same, it is necessary to reproduce the radio wave environment in the field for the receiving device with the fixed antenna without installing the receiving device itself in the field. Can be.

Further, the field receiving device includes a plurality of fixed antenna units each having a fixed receiving direction, an RF switching unit for switching a plurality of RF signals respectively received by the plurality of fixed antenna units, Since a switching control unit that controls switching of the plurality of RF signals by the RF switching unit is provided, a radio wave environment in a field for a receiving device having a plurality of fixed antennas can be reproduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a radio wave environment simulator according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining data in a predetermined format generated by a radio wave environment simulator according to the first embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a radio wave environment simulator according to a second embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a radio wave environment simulator according to a third embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration of a radio wave environment simulator according to a fourth embodiment of the present invention.

FIG. 6 is a block diagram illustrating a configuration of a radio wave environment simulator according to a fifth embodiment of the present invention.

FIG. 7 is a block diagram illustrating a configuration of a radio wave environment simulator according to a sixth embodiment of the present invention.

FIG. 8 is a block diagram illustrating a configuration of a radio wave environment simulator according to a seventh embodiment of the present invention.

FIG. 9 is a block diagram illustrating a configuration of a radio wave environment simulator according to an eighth embodiment of the present invention.

FIG. 10 is a diagram for explaining a configuration of a conventional radio wave simulator and a test mode for a specimen.

[Explanation of symbols]

7 Antenna section, 8 Receiver section, 9 Control / processing section, 10
a, 23, 25 receiving device, 10a receiving device to be a test sample, 10b field receiving device, 11A / D conversion unit, 12 data recording unit, 13, 28 radio wave recording device,
14, 21 recording media, 15 data reproducing unit, 16 D /
A conversion unit, 17 radio wave reproduction device, 18, 29, 31, 3
5 Radio wave recording / reproducing device, 19 Data converter, 20
Recording / reproducing unit, 24 radio wave recording / reproducing unit, 26 rotation antenna unit, 27 rotation control unit, 30, 32a, 32b, 3
2c Fixed antenna unit, 33 RF switching unit, 34 switching control unit.

Claims (7)

[Claims] 1. A receiving device serving as a test object, and a receiving device having at least a part of the same function as the receiving device serving as the test object, and an RF (Radio) received in a field.
Frequency) signal and a control signal for controlling a reception state of the RF signal, a field receiving device, and a recording medium that A / D converts the RF signal and the control signal obtained by the field receiving device Recording means for reading data recorded on the recording medium, D / A-converting the data to reproduce the RF signal and the control signal, and providing the reproduced signal to the receiving device serving as the specimen A radio wave environment simulator comprising: 2. An A / D conversion section for A / D converting the RF signal and the control signal to obtain data of a predetermined format, wherein the recording section includes: A data recording unit for recording data on the recording medium, wherein the reproducing unit reproduces the data from the recording medium, and performs D / A conversion on the data reproduced by the data reproducing unit. The radio wave environment simulator according to claim 1, further comprising: a D / A converter that obtains the RF signal and the control signal. 3. The radio wave environment simulator according to claim 1, wherein said recording means and said reproducing means are built in the same housing. 4. The field receiving device according to claim 1, wherein the field receiving device also serves as the receiving device serving as the test sample, and the recording unit is built in the test sample. Radio environment simulator. 5. The receiving device for a field, comprising: a rotating antenna having a rotatable receiving azimuth; and a rotation control section for controlling rotation of the receiving azimuth of the rotating antenna. The radio wave environment simulator according to any one of claims 1 to 3, wherein some functions are the same for a rotating antenna part of the device. 6. The field receiving device has a fixed antenna having a fixed receiving direction, and has a part of the same function as the fixed antenna of the receiving device serving as the specimen. The radio wave environment simulator according to claim 1. 7. The field receiving device comprises: a plurality of fixed antenna units each having a fixed receiving direction; and a plurality of R antennas respectively received by the plurality of fixed antenna units.
The radio wave environment simulator according to claim 6, further comprising: an RF switching unit that switches an F signal; and a switching control unit that controls switching of the plurality of RF signals by the RF switching unit.