Radio frequency signal detection system electric field radiation sensitivity test method

Abstract

The invention discloses an electric field radiation sensitivity test method for a radio frequency signal detection system. The method comprises the following steps: generating a radiation field by adopting a signal source A, an amplifier and a transmitting antenna; a directional coupler is connected in series to the rear end of an antenna of the radio frequency signal detection system, the output end of the directional coupler is connected to the input end of the radio frequency front end of the radio frequency signal detection system, and the coupling end of the directional coupler is connected to a signal source B through a coaxial cable; the working frequency of the signal source B is set to be f0, the output amplitude of the signal source B is recorded, the working frequency of the signal source B is kept unchanged, and the amplitude is increased by 3dB for emission; moving the transmitting antenna to radiate towards the components of the radio-frequency signal detection system, restarting radiation according to the recorded frequency and amplitude, observing whether the radio-frequency signal detection system is sensitive or not, and recording; and repeating the previous step until all the components of the radio frequency signal detection system are tested. According to the invention, the electric field radiation sensitivity test can be carried out on the whole system in the test frequency band range.

Description

Technical Field

[0001] The present invention belongs to the technical field of electromagnetic compatibility testing, and in particular relates to a method for testing the electric field radiation sensitivity of a radio frequency signal detection system. Background Art

[0002] The block diagram of a typical RF signal detection system is as follows: Figure 1 As shown in the figure, the antenna converts radio waves into electrical signals. Antenna control adjusts the antenna's azimuth and elevation. The RF front end conditions the signal and includes components such as limiters, low-noise amplifiers, and filters. Transmission, switching, and frequency conversion handle signal channel switching and frequency conversion, including switching matrices, RF optical transmission, and frequency converters. Demodulation and detection handle signal detection, acquisition, analysis, demodulation, and identification, primarily involving receivers and demodulators. Information processing processes the collected data and converts it into useful information, including computers and servers. Power cables, control cables, and communication cables provide power and interconnection for various devices.

[0003] Currently, two methods are commonly used to conduct electromagnetic radiation sensitivity tests on radio frequency signal detection systems:

[0004] (1) Avoid the operating frequency band of the equipment, that is, only test the frequency range of the non-operating frequency band;

[0005] (2) Remove the device antenna and use a signal source / simulator to directly inject the signal into the RF receiver, and then conduct a radiation test.

[0006] Since the working frequency band of the detection system is generally wide, method (1) avoids the working frequency band of the equipment, which actually reduces the electromagnetic compatibility assessment requirements; method (2) removes the antenna and does not assess the impact of the receiving antenna.

[0007] In summary, the above methods cannot meet the overall electric field radiation sensitivity test requirements within the test frequency band of the RF signal detection system. Summary of the Invention

[0008] The object of the present invention is to provide a method for testing the electric field radiation sensitivity of a radio frequency signal detection system, so as to realize the overall electric field radiation sensitivity test within the test frequency band of the radio frequency signal detection system.

[0009] The first aspect of the present invention provides a method for testing the electric field radiation sensitivity of a radio frequency signal detection system, the method comprising:

[0010] Use signal source A, an amplifier, and a transmitting antenna to generate a radiation field and monitor the size of the radiation field to ensure that the size of the radiation field within the test frequency band meets the limit requirements. At the same time, record the frequency and amplitude of the amplifier behind signal source A.

[0011] A directional coupler is connected in series to the rear end of the antenna of the RF signal detection system. The output end of the directional coupler is connected to the input end of the RF front end of the RF signal detection system. The coupling end of the directional coupler is connected to another signal source B using a coaxial cable.

[0012] The RF signal detection system works normally. Set the operating frequency of signal source B to f0, and slowly adjust the output amplitude of signal source B from small to large so that the receiver of the RF signal detection system can just receive the signal normally. Record the output amplitude of signal source B P0 at this time. Keep the operating frequency of signal source B unchanged, increase the amplitude by a preset multiple and transmit.

[0013] Point the transmitting antenna toward the RF signal detection system antenna, restart the radiation according to the recorded frequency and amplitude, observe whether the RF signal detection system becomes sensitive and record it; if it is sensitive, determine the sensitivity threshold level;

[0014] Move the transmitting antenna so that it radiates toward other components of the RF signal detection system, restart the radiation according to the recorded frequency and amplitude, and observe and record whether the RF signal detection system becomes sensitive; if so, determine the sensitivity threshold level;

[0015] Repeat the previous step until all components of the RF signal detection system have been tested.

[0016] In some of these embodiments, the magnitude of the radiated field is monitored using an electric field sensor or a receiving antenna.

[0017] In some of these embodiments, the test frequency band range and limits are determined according to test requirements.

[0018] In some embodiments, the power line of the radio frequency signal detection system is connected to the line impedance stabilization network using an unshielded cable.

[0019] In some embodiments, the operating frequency f0 is within the operating frequency range of the radio frequency signal detection system.

[0020] In some embodiments, the preset multiple is 3dB.

[0021] In some embodiments, when the radiation is restarted according to the recorded frequency and amplitude, all frequency points within the preset range are removed.

[0022] In some embodiments, the preset range is f0±5%.

[0023] In some of these embodiments, the sensitivity threshold level is determined based on the size of the monitored radiation field.

[0024] According to a second aspect of the present invention, a radio frequency signal detection system is provided. The radio frequency signal detection system performs an electric field radiation sensitivity test using the radio frequency signal detection system electric field radiation sensitivity test method described in any one of the first aspects.

[0025] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0026] The present invention adopts a method combining radiation and injection, maintains the original connection of the radio frequency signal detection system, and can perform electric field radiation sensitivity test on the entire system within the test frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A block diagram of the physical composition of a typical detection system provided in an embodiment of the present application;

[0028] Figure 2 A field calibration configuration diagram using an electric field probe provided in an embodiment of the present application;

[0029] Figure 3 A connection diagram of a radio frequency signal detection system with a directional coupler connected in series provided in an embodiment of the present application;

[0030] Figure 4 This is a configuration diagram of an electric field sensitivity radiation test provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments provided in this application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention.

[0032] Obviously, the drawings described below are merely examples or embodiments of the present application. Those skilled in the art can, without inventive effort, apply the present application to other similar scenarios based on these drawings. Furthermore, it is also understood that, although the effort involved in such a development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, changes in design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as an insufficiency of the content disclosed in this application.

[0033] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments unless there is a conflict.

[0034] Unless otherwise defined, the technical or scientific terms used in this application should have the ordinary meaning understood by a person of ordinary skill in the technical field to which this application belongs. The words "one", "a", "the" and the like used in this application do not indicate a limit on quantity and may indicate the singular or plural. The terms "include", "comprise", "have" and any variations thereof used in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units that are inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The word "multiple" used in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific order for the objects.

[0035] This application provides a method for testing the electric field radiation sensitivity of a radio frequency signal detection system. The specific steps are as follows:

[0036] Step 1: If Figure 2 As shown, signal source A, an amplifier, and a transmitting antenna are used to generate a radiation field, and an electric field sensor or a receiving antenna is used to monitor the size of the radiation field to ensure that the size of the radiation field within the test frequency band meets the limit requirements (the specific test frequency range and limit are based on the test outline requirements), and the frequency and output amplitude of the rear-end amplifier of signal source A are recorded.

[0037] Step 2: Connect a directional coupler in series to the back end of the antenna of the RF signal detection system. The output of the directional coupler is connected to the input of the RF front end of the RF signal detection system. The coupling end of the directional coupler is connected to another signal source B using a coaxial cable. Figure 3 shown. Figure 3 This is the connection diagram of the RF signal detection system with a directional coupler in series (antenna control, power supply and connecting cables are not drawn).

[0038] Step 3: Ensure the RF signal detection system is operating normally (use an unshielded cable to connect the power cord to the line impedance stabilization network). Set the operating frequency of signal source B to f0 (f0 is within the operating frequency range of the RF signal detection system). Slowly adjust the output amplitude of signal source B from low to high so that the detection system's receiver can just receive the signal. Record the output amplitude of signal source B at this time, P0. The operating frequency of signal source B remains unchanged, and the amplitude is increased by 3dB.

[0039] Step 4: Point the transmitting antenna in step 1 toward the antenna of the RF signal detection system, and restart the radiation according to the frequency and amplitude recorded in step 1 (excluding all frequency points within the range of f0±5%), and observe whether the RF signal detection system becomes sensitive and record it. Figure 4 As shown, Figure 4 This is the configuration diagram for the electric field sensitivity radiation test (field monitoring equipment is not shown). If sensitivity occurs, the sensitivity threshold level is determined based on the size of the radiation field monitored in step 1.

[0040] Step 5: Move the transmitting antenna so that it radiates toward other components of the RF signal detection system. Restart the radiation according to the frequency and amplitude of the signal source recorded in Step 1. Observe and record whether the RF signal detection system becomes sensitive. If so, determine the sensitivity threshold level.

[0041] Step 6: Repeat step 5 until all components of the RF signal detection system are tested.

[0042] The present application also provides a radio frequency signal detection system, which performs an electric field radiation sensitivity test using the radio frequency signal detection system electric field radiation sensitivity test method described in the previous method embodiment.

[0043] In summary, the present application adopts a method combining radiation and injection, maintains the original connection of the radio frequency signal detection system, and can perform electric field radiation sensitivity tests on the entire system within the test frequency band.

[0044] It should be noted that the various technical features of the above-described embodiments can be combined in any manner. To simplify the description, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there are no contradictions in the combination of these technical features, they should be considered to be within the scope of this specification. In addition, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0045] Those skilled in the art will readily understand that the above-described embodiments merely represent several implementation methods of the present application, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the invention. It should be noted that a person of ordinary skill in the art may make several variations and improvements without departing from the concept of the present application, and these variations and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be based on the appended claims.

Claims

1. A method for testing the electric field radiation sensitivity of a radio frequency signal detection system, characterized in that: The method includes: Use signal source A, an amplifier, and a transmitting antenna to generate a radiation field and monitor the size of the radiation field to ensure that the size of the radiation field within the test frequency band meets the limit requirements. At the same time, record the frequency and amplitude of the amplifier behind signal source A. A directional coupler is connected in series to the rear end of the antenna of the RF signal detection system. The output end of the directional coupler is connected to the input end of the RF front end of the RF signal detection system. The coupling end of the directional coupler is connected to another signal source B using a coaxial cable. The RF signal detection system works normally. Set the operating frequency of signal source B to f0, and slowly adjust the output amplitude of signal source B from small to large so that the receiver of the RF signal detection system can just receive the signal normally. Record the output amplitude of signal source B P0 at this time. Keep the operating frequency of signal source B unchanged, increase the amplitude by a preset multiple and transmit. Point the transmitting antenna toward the RF signal detection system antenna, restart the radiation according to the recorded frequency and amplitude, observe whether the RF signal detection system becomes sensitive and record it; if it is sensitive, determine the sensitivity threshold level; Move the transmitting antenna so that it radiates toward other components of the RF signal detection system, restart the radiation according to the recorded frequency and amplitude, and observe and record whether the RF signal detection system becomes sensitive; if so, determine the sensitivity threshold level; Repeat the previous step until all components of the RF signal detection system have been tested.

2. The method for testing the electric field radiation sensitivity of a radio frequency signal detection system according to claim 1, wherein: Monitor the magnitude of the radiated field using an electric field sensor or a receiving antenna.

3. The electric field radiation sensitivity test method of the radio frequency signal detection system according to claim 1, characterized in that: The test frequency band range and limits are determined based on the test requirements.

4. The electric field radiation sensitivity test method of the radio frequency signal detection system according to claim 1, characterized in that: The power line of the radio frequency signal detection system uses an unshielded cable to connect the line impedance stabilization network.

5. The electric field radiation sensitivity test method of the radio frequency signal detection system according to claim 1, characterized in that: The operating frequency f0 is within the operating frequency range of the radio frequency signal detection system.

6. The electric field radiation sensitivity test method of the radio frequency signal detection system according to claim 1, characterized in that: The default multiplier is 3dB.

7. The electric field radiation sensitivity test method of the radio frequency signal detection system according to claim 1, characterized in that: When the radiation is turned on again according to the recorded frequency and amplitude, all frequency points within the preset range are removed.

8. The method for testing the electric field radiation sensitivity of a radio frequency signal detection system according to claim 7, wherein: The preset range is f0±5%.

9. The method for testing the electric field radiation sensitivity of a radio frequency signal detection system according to claim 1, wherein: The sensitivity threshold level is determined according to the size of the monitored radiation field.

10. A radio frequency signal detection system, characterized in that: The radio frequency signal detection system uses the radio frequency signal detection system electric field radiation sensitivity test method according to any one of claims 1 to 9 to perform an electric field radiation sensitivity test.

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