CN113655449A - Device and method for reducing coupling signals of transmitting and receiving antenna in RCS test - Google Patents
Device and method for reducing coupling signals of transmitting and receiving antenna in RCS test Download PDFInfo
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- CN113655449A CN113655449A CN202110878133.9A CN202110878133A CN113655449A CN 113655449 A CN113655449 A CN 113655449A CN 202110878133 A CN202110878133 A CN 202110878133A CN 113655449 A CN113655449 A CN 113655449A
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- 238000012360 testing method Methods 0.000 title claims abstract description 50
- 230000008878 coupling Effects 0.000 title claims abstract description 23
- 238000010168 coupling process Methods 0.000 title claims abstract description 23
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001028 reflection method Methods 0.000 claims abstract description 5
- 230000007246 mechanism Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000011358 absorbing material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
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Abstract
The invention belongs to the technical field of aerospace antenna test, and discloses a device and a method for reducing coupling signals of a transmitting antenna and a receiving antenna in RCS test, wherein in the RCS test of a tested object by using a signal reflection method, a transmitting antenna is used for transmitting a transmitting signal to the tested object, the transmitting antenna is in an open circuit state at the moment, and the receiving antenna is in a closed state; after the object to be measured is hit by the emission signal, the object to be measured reflects the emission signal into a reflection signal, when the reflection signal reaches the receiving antenna, the receiving antenna is in an open circuit state to receive the signal, and the emission antenna is in a closed state to not emit the signal outwards. The invention controls the transmitting time of the transmitting antenna and the receiving time of the receiving antenna, so that the signals of the transmitting antenna and the receiving antenna are asynchronous, and the signals are transmitted and received by staggering peaks, thereby greatly avoiding the generation of coupling signals between the transmitting antenna and the receiving antenna and improving the test accuracy of RCS.
Description
Technical Field
The invention belongs to the technical field of aerospace antenna testing, relates to a testing device and method for testing a tested object by using a reflection method, and particularly relates to a device and method for reducing transmitting and receiving antenna coupling signals in RCS testing.
Background
The compact field generates a plane wave with good performance in a test dead zone, and the plane wave irradiates a tested object. Firstly, testing a background scattering signal of an empty darkroom (comprising a bracket turntable); finally, placing the target to be tested on a support turntable, and testing the scattering signal of the target in the range of a specified frequency domain and an angular domain; after the test data is finished, processing the data; vector background cancellation and time domain gate processing are carried out on the collected calibration data, the target data and the background data, and influences of clutter such as a support turntable, coupling of a transmitting and receiving antenna, tight range edge strong reflection, rear wall strong reflection and the like are eliminated.
Due to the influence of clutter such as support turntable, transmitting-receiving antenna coupling, strong reflection at the edge of compact range, strong reflection at the rear wall and the like. The performance of the RCS test dead zone is influenced, and the test accuracy of the target RCS is reduced.
In the existing RCS testing technology, foam wave-absorbing materials are placed between receiving and transmitting antennas to eliminate testing influence caused by coupling of the receiving and transmitting antennas, but the foam wave-absorbing materials cannot be completely wrapped on the receiving and transmitting antennas, so that coupling signals of the receiving and transmitting antennas cannot be completely absorbed, interference signals of the coupling signals can appear in a testing dead zone, and errors are caused in analysis of testing results.
Disclosure of Invention
In order to solve the above problems, the present invention provides an apparatus and a method for reducing the coupling signal of the transmitting and receiving antenna in the RCS test, which can effectively eliminate the coupling signal of the transmitting and receiving antenna and effectively improve the quiet zone performance of the RCS test.
The technical scheme of the invention is as follows:
a device for reducing coupling signals of a transmitting antenna and a receiving antenna in an RCS test comprises a transmitting antenna and a receiving antenna, wherein the transmitting antenna is connected with a first control device, the receiving antenna is connected with a second control device, the transmitting antenna transmits signals under the control of the first control device and strikes an object to be tested through a reflecting surface, the transmitting signals are reflected by the object to be tested to be changed into reflecting signals, and the reflecting signals are transmitted back to the receiving antenna controlled by the second control device through the reflecting surface; the transmitting antenna and the receiving antenna are arranged in the same area.
Further, the first control device and the second control device each include a PIN switch; the PIN switch of the first control device is connected with and controls the transmitting antenna, when the PIN switch of the first control device is switched on, the transmitting antenna is in an open-circuit state, and when the PIN switch of the first control device is switched off, the transmitting antenna is in a closed state; and when the PIN switch of the second control device is switched on, the receiving antenna is in an open-circuit state, and when the PIN switch of the second control device is switched off, the receiving antenna is in a closed state. The open circuit and the close circuit of the transmitting antenna and the receiving antenna are controlled by the PIN switch, the reaction time is short, the state switching is rapid, and the requirement of the method can be met.
Further, the first control device and the second control device each include a timer, and the PIN switches of the first control device and the second control device are connected and controlled by the timers of the first control device and the second control device. The timer is the simplest time gate control mechanism, and has low cost, high reliability and low possibility of failure.
A method for reducing the coupling signal of the receiving and transmitting antenna in the RCS test, in RCS test to the testee with the signal reflection method, use the transmitting antenna to transmit the transmitting signal to the testee, the transmitting antenna is in the open circuit state at this moment, the receiving antenna is in the closed state; after the object to be measured is hit by the emission signal, the object to be measured reflects the emission signal into a reflection signal, when the reflection signal reaches the receiving antenna, the receiving antenna is in an open circuit state to receive the signal, and the emission antenna is in a closed state to not emit the signal outwards.
Further, the switching of the open and closed states of the transmitting antenna and the receiving antenna is controlled by respective time gate mechanisms, specifically a timer and a PIN switch.
Further, the method specifically comprises the following steps:
when a transmitting antenna receives a source signal, a PIN switch at a transmitting antenna end is powered on to enable the PIN switch to be in a conducting state, the signal is transmitted out through the transmitting antenna at the moment, and the PIN switch at a receiving antenna end is in a closed state at the moment, so that the receiving antenna does not receive the transmitting signal from the transmitting antenna;
step two, after the signal is transmitted by the transmitting antenna, the timer records that a certain time t1 passes, the PIN switch at the transmitting antenna end is closed to enable the PIN switch to be in a closed state, the PIN switch at the receiving antenna end is opened to enable the PIN switch to be in an open state, and the receiving antenna starts to receive the reflected signal from the measured object;
step three, after the two PIN switches are respectively switched into the states, after the timer records that a certain time t2 passes, the PIN switch at the transmitting antenna end is opened to enable the PIN switch to be in the open-circuit state, the PIN switch at the receiving antenna end is closed to enable the PIN switch to be in the closed state, and the transmitting antenna restarts to transmit signals;
and step four, repeating the step two and the step three until the RCS test is completed.
Further, the t1 time is: the transmission signal is transmitted by the transmitting antenna and then reaches the object to be measured in the form of parallel waves through the reflecting surface, and the time taken at this time is t 1. By measuring in advance and determining the time of t1 to set the timer, the receiving antenna can be ensured not to receive signals when the signals are transmitted, and the transmitting antenna can not transmit signals when the receiving antenna receives the signals, thereby avoiding mutual interference from influencing the RCS test.
Further, the t2 time is: when the reflected signal of the object to be measured reaches the receiving antenna through the reflecting surface, the signal is amplified through the low-noise amplifier, and the time used after the signal enters the vector network to read data is t 2. By setting the timer in advance of the time measured and determined at t2, it is ensured that the test runs continuously and uninterruptedly and that the transmitting and receiving antennas do not interfere with each other.
The invention has the advantages that:
1. the invention controls the transmitting time of the transmitting antenna and the receiving time of the receiving antenna, so that the signals of the transmitting antenna and the receiving antenna are asynchronous, and the signals are transmitted and received by staggering peaks, thereby greatly avoiding the generation of coupling signals between the transmitting antenna and the receiving antenna and improving the test accuracy of RCS;
2. the invention uses a simple time door mechanism, has high reliability and low cost, and can ensure long-time uninterrupted operation;
3. the invention has little change to the original RCS test and is convenient for the tester to test.
Drawings
FIG. 1 is a schematic diagram of the RCS test principle of the present invention;
FIG. 2 is a schematic diagram of the timer and PIN switch of the present invention;
the system comprises a transmitting antenna 1, a receiving antenna 2, a first control device 3, a second control device 4, a reflecting surface 5, a measured object 6, a timer 7, a power amplifier 8, a source signal 9, a low noise amplifier 10 and a vector network 11.
Detailed Description
This section is an example of the present invention and is provided to explain and illustrate the technical solutions of the present invention.
A device for reducing the coupling signal of a transmitting antenna and a receiving antenna in an RCS test comprises a transmitting antenna 1 and a receiving antenna 2, wherein the transmitting antenna 1 is connected with a first control device 3, the receiving antenna 2 is connected with a second control device 4, the transmitting antenna 1 transmits a signal under the control of the first control device 3 and strikes a measured object 6 through a reflecting surface 5, the transmitted signal is reflected by the measured object 6 to become a reflected signal, and the reflected signal is transmitted back to the receiving antenna 2 controlled by the second control device 4 through the reflecting surface 5; the transmitting antenna 1 and the receiving antenna 2 are arranged in the same area.
The first control means 3 and the second control means 4 each comprise a PIN switch; the PIN switch of the first control device 3 is connected with and controls the transmitting antenna 1, when the PIN switch of the first control device 3 is switched on, the transmitting antenna 1 is in an open-circuit state, and when the PIN switch of the first control device 3 is switched off, the transmitting antenna 1 is in a closed state; the PIN switch of the second control device 4 is connected with and controls the receiving antenna 2, when the PIN switch of the second control device 4 is turned on, the receiving antenna 2 is in an open state, and when the PIN switch of the second control device 4 is turned off, the receiving antenna 2 is in a closed state. The open circuit and the close circuit of the transmitting antenna 1 and the receiving antenna 2 are controlled by the PIN switch, the reaction time is short, the state switching is rapid, and the method can meet the requirements of the method.
The first control means 3 and the second control means 4 each comprise a timer, and the PIN switches of the first control means 3 and the second control means 4 are connected and controlled by the respective timers 7 of the first control means 3 and the second control means 4. The timer 7 is the simplest time gate control mechanism, and has low cost, high reliability and difficult failure.
A method for reducing the coupling signal of the receiving and transmitting antenna in the RCS test, in RCS test to the testee with the signal reflection method, use the transmitting antenna to transmit the transmitting signal to the testee, the transmitting antenna is in the open circuit state at this moment, the receiving antenna is in the closed state; after the object to be measured is hit by the emission signal, the object to be measured reflects the emission signal into a reflection signal, when the reflection signal reaches the receiving antenna, the receiving antenna is in an open circuit state to receive the signal, and the emission antenna is in a closed state to not emit the signal outwards.
The switching of the open and closed states of the transmitting and receiving antennas is controlled by respective time gate mechanisms, in particular a timer and a PIN switch.
The method specifically comprises the following steps:
when a transmitting antenna receives a source signal, a PIN switch at a transmitting antenna end is powered on to enable the PIN switch to be in a conducting state, the signal is transmitted out through the transmitting antenna at the moment, and the PIN switch at a receiving antenna end is in a closed state at the moment, so that the receiving antenna does not receive the transmitting signal from the transmitting antenna;
step two, after the signal is transmitted by the transmitting antenna, the timer records that a certain time t1 passes, the PIN switch at the transmitting antenna end is closed to enable the PIN switch to be in a closed state, the PIN switch at the receiving antenna end is opened to enable the PIN switch to be in an open state, and the receiving antenna starts to receive the reflected signal from the measured object;
step three, after the two PIN switches are respectively switched into the states, after the timer records that a certain time t2 passes, the PIN switch at the transmitting antenna end is opened to enable the PIN switch to be in the open-circuit state, the PIN switch at the receiving antenna end is closed to enable the PIN switch to be in the closed state, and the transmitting antenna restarts to transmit signals;
and step four, repeating the step two and the step three until the RCS test is completed.
time t1 is: the transmission signal is transmitted by the transmitting antenna and then reaches the object to be measured in the form of parallel waves through the reflecting surface, and the time taken at this time is t 1. By measuring in advance and determining the time of t1 to set the timer, the receiving antenna can be ensured not to receive signals when the signals are transmitted, and the transmitting antenna can not transmit signals when the receiving antenna receives the signals, thereby avoiding mutual interference from influencing the RCS test.
time t2 is: when the reflected signal of the object to be measured reaches the receiving antenna through the reflecting surface, the signal is amplified through the low-noise amplifier, and the time used after the signal enters the vector network to read data is t 2. By setting the timer in advance of the time measured and determined at t2, it is ensured that the test runs continuously and uninterruptedly and that the transmitting and receiving antennas do not interfere with each other.
The method and the principle of the invention are as follows:
the invention designs a device for reducing coupling signals of a transmitting antenna and a receiving antenna in an RCS test, which consists of a timer and a PIN switch, wherein the device is respectively connected with the receiving antenna and the transmitting antenna, a 'time gate' is added to the transmitting antenna in the RCS test, and the receiving antenna is in a closed state when the transmitting antenna transmits signals under the control of the 'time gate' of the device. When the receiving antenna receives signals, the transmitting antenna is in a closed state, so that the signals of the transmitting and receiving antennas are asynchronous, the signals are transmitted and received in a staggered peak mode, the occurrence of coupling signals between the transmitting and receiving antennas is greatly avoided, and the test accuracy of RCS is improved. The device controls the transmitting time of the transmitting antenna and the receiving time of the receiving antenna, so that the signals of the transmitting antenna and the receiving antenna are asynchronous, the signals are transmitted and received in a staggered peak mode, the occurrence of coupling signals between the transmitting antenna and the receiving antenna is greatly avoided, and the test accuracy of RCS is improved.
The invention discloses a device for reducing coupling signals of a receiving antenna and a transmitting antenna in an RCS test.
Step 1: the source signal transmitting signal reaches the device at the transmitting antenna end through the power amplifier, the PIN switch of the device at the transmitting antenna end is powered on to enable the PIN switch to be in a conducting state, the signal is transmitted out through the transmitting antenna at the moment, and the PIN switch of the device at the receiving antenna end is in a closed state to enable the receiving antenna not to receive the transmitting signal from the transmitting antenna at the moment.
Step 2: after the signal is transmitted by the transmitting antenna, the signal reaches a measured object in a parallel wave mode through the reflecting surface, the time used at this time is t1, the PIN switch of the device at the transmitting antenna end is always powered on to enable the PIN switch to be in a conducting state, and the PIN switch of the device at the receiving antenna end is in a closed state. And after t1, the signal generates a reflected signal through the measured object, and at the moment, the timer of the device at the transmitting antenna end records that after t1 time, the PIN switch of the device at the transmitting antenna end is powered off, so that the PIN switch is in a closed state, and the transmitting antenna does not transmit the signal. And at the receiving antenna end, the timer of the device is powered on and in a conducting state after t1 time, so that the receiving antenna starts to receive the reflected signal from the measured object.
And step 3: after the reflected signal of the object to be measured reaches the receiving antenna through the reflecting surface, the signal is amplified through the low-noise amplifier by the device, and the time used after the signal enters the vector network to read data is t 2. The source signal re-emission signal at this time, after the timer of the device at the transmitting antenna end records t2 time, the PIN switch of the device at the transmitting antenna end is powered on to enable the PIN switch to be in a conducting state, so that the transmitting antenna transmits the signal. And at the receiving antenna end, the timer of the device is powered off and is in a closed state after t2 time, so that the receiving antenna does not receive the reflected signal from the measured object.
Claims (8)
1. A device for reducing coupling signals of a transmitting antenna and a receiving antenna in an RCS test is characterized by comprising a transmitting antenna (1) and a receiving antenna (2), wherein the transmitting antenna (1) is connected with a first control device (3), the receiving antenna (2) is connected with a second control device (4), the transmitting antenna (1) transmits signals under the control of the first control device (3) and strikes a measured object (6) through a reflecting surface (5), the transmitted signals are reflected by the measured object (6) to form reflected signals, and the reflected signals are transmitted back to the receiving antenna (2) controlled by the second control device (4) through the reflecting surface (5); the transmitting antenna (1) and the receiving antenna (2) are arranged in the same area.
2. An arrangement for reducing the coupled signals of a transmitting and receiving antenna in an RCS test according to claim 1, characterized in that the first control means (3) and the second control means (4) each comprise a PIN switch; the PIN switch of the first control device (3) is connected with and controls the transmitting antenna (1), when the PIN switch of the first control device (3) is switched on, the transmitting antenna (1) is in an open-circuit state, and when the PIN switch of the first control device (3) is switched off, the transmitting antenna (1) is in a closed state; the PIN switch of the second control device (4) is connected with and controls the receiving antenna (2), when the PIN switch of the second control device (4) is turned on, the receiving antenna (2) is in an open-circuit state, and when the PIN switch of the second control device (4) is turned off, the receiving antenna (2) is in a closed state.
3. An arrangement for reducing the coupled signals of a transmitting and receiving antenna in an RCS test according to claim 2, characterized in that the first control means (3) and the second control means (4) each comprise a timer, and that the PIN switches of the first control means (3) and the second control means (4) are connected and controlled by the respective timers (7) of the first control means (3) and the second control means (4).
4. A method for reducing the coupled signal of the receiving and dispatching antenna in RCS test, characterized by, in carrying on RCS test to the testee with the signal reflection method, use the transmitting antenna to transmit the transmitted signal to the testee, the transmitting antenna is in the open circuit state at this moment, the receiving antenna is in the closed state; after the object to be measured is hit by the emission signal, the object to be measured reflects the emission signal into a reflection signal, when the reflection signal reaches the receiving antenna, the receiving antenna is in an open circuit state to receive the signal, and the emission antenna is in a closed state to not emit the signal outwards.
5. The method for reducing the coupling signal of the transmitting and receiving antennas in the RCS test according to claim 4, wherein the switching of the open and closed states of the transmitting antenna and the receiving antenna is controlled by respective time gate mechanisms, wherein the time gate mechanisms are embodied as a timer and a PIN switch.
6. The method of claim 5, further comprising the steps of:
when a transmitting antenna receives a source signal, a PIN switch at a transmitting antenna end is powered on to enable the PIN switch to be in a conducting state, the signal is transmitted out through the transmitting antenna at the moment, and the PIN switch at a receiving antenna end is in a closed state at the moment, so that the receiving antenna does not receive the transmitting signal from the transmitting antenna;
step two, after the signal is transmitted by the transmitting antenna, the timer records that a certain time t1 passes, the PIN switch at the transmitting antenna end is closed to enable the PIN switch to be in a closed state, the PIN switch at the receiving antenna end is opened to enable the PIN switch to be in an open state, and the receiving antenna starts to receive the reflected signal from the measured object;
step three, after the two PIN switches are respectively switched into the states, after the timer records that a certain time t2 passes, the PIN switch at the transmitting antenna end is opened to enable the PIN switch to be in the open-circuit state, the PIN switch at the receiving antenna end is closed to enable the PIN switch to be in the closed state, and the transmitting antenna restarts to transmit signals;
and step four, repeating the step two and the step three until the RCS test is completed.
7. The method of claim 6, wherein the time t1 is: the transmission signal is transmitted by the transmitting antenna and then reaches the object to be measured in the form of parallel waves through the reflecting surface, and the time taken at this time is t 1.
8. The method of claim 6, wherein the time t2 is: when the reflected signal of the object to be measured reaches the receiving antenna through the reflecting surface, the signal is amplified through the low-noise amplifier, and the time used after the signal enters the vector network to read data is t 2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110878133.9A CN113655449A (en) | 2021-07-30 | 2021-07-30 | Device and method for reducing coupling signals of transmitting and receiving antenna in RCS test |
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| CN202110878133.9A CN113655449A (en) | 2021-07-30 | 2021-07-30 | Device and method for reducing coupling signals of transmitting and receiving antenna in RCS test |
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| US5471146A (en) * | 1993-06-14 | 1995-11-28 | Motorola, Inc. | Method and apparatus for measuring return loss |
| US6061017A (en) * | 1998-05-22 | 2000-05-09 | The United States Of America As Represented By The Secretary Of The Navy | System for increasing isolation in active radar augmentation systems |
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| CN103308898A (en) * | 2013-05-20 | 2013-09-18 | 中国电子科技集团公司第四十一研究所 | Single-station pulse RCS (Radar Cross Section) testing system based on switch shifting |
| US20160238427A1 (en) * | 2015-02-13 | 2016-08-18 | Honeywell International Inc. | Electronic level gauge having improved noise rejection and power transmission |
| CN109917344A (en) * | 2019-03-28 | 2019-06-21 | 北京环境特性研究所 | Corner reflector RCS single antenna measuring system and measurement method in a kind of Compact Range |
| CN112230209A (en) * | 2020-09-28 | 2021-01-15 | 北京环境特性研究所 | Remote double-station RCS measuring device and method |
-
2021
- 2021-07-30 CN CN202110878133.9A patent/CN113655449A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5471146A (en) * | 1993-06-14 | 1995-11-28 | Motorola, Inc. | Method and apparatus for measuring return loss |
| US6061017A (en) * | 1998-05-22 | 2000-05-09 | The United States Of America As Represented By The Secretary Of The Navy | System for increasing isolation in active radar augmentation systems |
| CN102590795A (en) * | 2012-02-29 | 2012-07-18 | 中国电子科技集团公司第二十二研究所 | Microwave scattering property test system based on vector network analyzer |
| CN102955151A (en) * | 2012-10-09 | 2013-03-06 | 中国人民解放军63892部队 | Adaptive cross-polarization active jamming method and device |
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