Automatic monitoring and alarming device for space microwave radiation power

Abstract

The invention belongs to the technical field of ship systems, and discloses a space microwave radiation power automatic monitoring alarm device which comprises an omnidirectional antenna, a coaxial attenuator, a filter, a radio frequency detection comparison control unit and an alarm lamp. Wherein the radio frequency detection comparison control unit comprises a detection comparator, a pulse broadening chip and a relay. On the basis that the original radiation source design is not changed, the defects and deficiencies of an existing monitoring system can be overcome, the sound-light alarm device is additionally arranged, when it is detected that high-power microwave radiation exists in the surrounding environment, an alarm is automatically given, and testers are reminded to pay attention to evacuation; and meanwhile, whether the signal is radiated or not is detected in the space, so that the tested equipment personnel have more energy to pay attention to the state of the equipment, and a powerful guarantee is provided for smooth development of the test of the tested equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of ship systems. Background Art

[0002] A high-power microwave radiation source is a commonly used device. When such a device is working, on the one hand, it is necessary to know the working status of the device, and on the other hand, it is necessary to know whether the microwave power is radiated into space. In order to monitor whether the high-power microwave radiation source radiates the power, the traditional monitoring method is to add a coupling and detection device to the microwave transmission channel. The device couples a part of the transmitter power through a directional coupler, outputs the transmitter envelope signal through the detector, and sends it to the back-end processor for processing to obtain the working status and approximate power of the transmitter. However, there are the following shortcomings: First, there is a lack of real-time alarm function. When the radiation power reaches a certain threshold, the original device does not have a timely alarm mechanism, and it is impossible to notify the test personnel to evacuate and protect in time. Second, even if an alarm system is designed, it is often designed to alarm as soon as it is turned on. Lack of accurate terminal detection, the original device cannot accurately judge whether the signal is actually radiated, which will cause the test equipment personnel to misjudge the equipment status, affecting the accuracy and effectiveness of the test. Therefore, it is urgent to develop an automatic monitoring and alarm device for space microwave radiation power to indicate the space radiation status of the radiation source. Summary of the invention

[0003] In order to solve the shortcomings and deficiencies of the current monitoring system, the present invention provides an automatic monitoring and alarm device for space microwave radiation power. Without changing the original design of the radiation source, an omnidirectional receiving antenna is added, a radio frequency detection comparison control unit circuit board is attached, and a relay is controlled to trigger an audible and visual alarm light, thereby realizing the monitoring of the space radiation power of a high-power radiation source and starting an alarm, thus solving the shortcomings and deficiencies of the existing monitoring system and achieving clear indications that are easy to understand at a glance.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] It includes an omnidirectional antenna, a coaxial attenuator, a filter, a radio frequency detection comparison control unit, and an alarm light; the radio frequency detection comparison control unit includes a detection comparator, a pulse broadening chip, and a relay connected in sequence; the omnidirectional antenna is installed near the back lobe of the radiation source antenna to receive the back lobe signal generated when the radiation source radiates into the air; the coaxial attenuator is directly installed at the output end of the omnidirectional antenna to adjust the size of the received signal; the filter is connected to the input end of the radio frequency detection comparison control unit to select the radiation frequency of the radiation source and suppress the surrounding interference signal; the coaxial attenuator and the filter are selected according to the radiation power of the radiation source and the electromagnetic environment in which the radiation source is used; the radio frequency detection comparison control unit is connected to the alarm light to detect the received radio frequency microwave signal and send out a trigger alarm voltage; when the alarm light receives a high-power radiation signal, an alarm is sounded.

[0006] Furthermore, when the radiation source system operates normally, the frequency and power of the backlobe signal received by the omnidirectional antenna are fixed.

[0007] Furthermore, the output of the radio frequency detection comparison control unit is connected to the alarm light through two wires, and the two wires are respectively the control voltage and the ground.

[0008] Furthermore, the warning light is a small LED strobe warning light with a control voltage of 12V.

[0009] Furthermore, the detection comparator detects, compares and judges the radio frequency signal received by the omnidirectional antenna, and the pulse stretching chip stretches the periodic pulse of the detection comparator to a high level as the control voltage of the relay; the relay is turned on under the action of the control voltage, and the output 12V voltage controls the alarm light to flash.

[0010] The beneficial effects achieved by the present invention are as follows: the present invention adds an audible and visual alarm device, which can solve the shortcomings and deficiencies of the existing monitoring system. When a high-power signal is radiated, an alarm is activated to remind test personnel to evacuate and hide, and at the same time, it is clear to the tested equipment whether the radiation source simulation target is normal. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic diagram of a preferred embodiment of the present invention;

[0012] Figure 2 It is a schematic diagram of a radio frequency detection comparison control unit; DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0014] like Figure 1-2 As shown, a preferred automatic monitoring and alarm device for space microwave radiation power of the present invention includes an omnidirectional antenna, a coaxial attenuator, a filter, a radio frequency detection comparison control unit, and an alarm light; wherein the radio frequency detection comparison control unit includes a detection comparator, a pulse broadening chip, and a relay. The omnidirectional antenna is used to receive the backlobe signal generated when the radiation source radiates into the air; the coaxial attenuator is used to adjust the size of the received signal to ensure that the received signal falls within the ideal receiving level range of the broadband detection comparator; the filter is used to select the radiation frequency of the radiation source and suppress the surrounding interference signal; the coaxial attenuator and the filter are selected according to the radiation power of the radiation source and the electromagnetic environment in which the radiation source is used; the radio frequency detection comparison control unit is used to detect the received radio frequency microwave signal and send out a trigger alarm voltage; the alarm light is used to ensure the safety of the test personnel, and when a high-power signal is radiated, the system will sound an alarm.

[0015] In the embodiment, the omnidirectional antenna is installed near the back lobe of the radiation source antenna. When the radiation source system works normally, the frequency and power of the back lobe signal received by the omnidirectional antenna are fixed. The coaxial attenuator is directly installed at the output end of the omnidirectional antenna and connected to the input end of the RF detection comparison control unit through an RF cable. The output of the RF detection comparison control unit is connected to the alarm light through two wires, which are the control voltage and the ground. The alarm light is a small LED strobe warning light with a control voltage of 12V.

[0016] The preferred RF detection comparison control unit includes a detection comparator, a pulse stretching chip and a relay connected in sequence. The detection comparator is used to detect, compare and judge the RF signal received by the omnidirectional antenna, and the pulse stretching chip is used to stretch the periodic pulse output by the detection comparator to a high level as the control voltage of the relay. The relay is turned on under the action of the control voltage, and the output 12V voltage controls the alarm light to flash.

[0017] like Figure 1 As shown, the omnidirectional antenna receives the radiation signal from the back lobe of the radiation source antenna, adjusts the size of the received signal through the coaxial attenuator, and outputs it to the RF detection comparison control unit through the RF cable. The RF detection comparison control unit outputs a control voltage to control the alarm light to alarm.

[0018] In this embodiment, the use environment is the antenna near field, the radiation power aperture value of the high-power radiation source in the L-band is greater than or equal to 80dBw, and the antenna backlobe space leakage is tested to be about 0dBm. Xi'an Hengda Microwave Vertically Polarized Omnidirectional Antenna HD-0716CVOA2N is used. Frequency range: 0.7-1.6GHz, antenna diameter is less than or equal to 50mm, height is less than or equal to 200mm. In the L-band, the standing wave is less than 2, the azimuth surface wave width is 360°, the elevation surface wave width is 94.5°, and the gain is 1.43dB. Other simpler receiving antennas can also be used, as long as the antenna receiving frequency covers the frequency of the radiation source.

[0019] The coaxial attenuator used in this embodiment is a coaxial attenuator from Mini Company. The attenuator input interface is SMA-J, the output interface is SMA-K, the frequency range is DC-18GHz, the maximum power handling is 2W, the attenuation value unit is decibel, and the attenuation value is selected according to the actual use environment.

[0020] like Figure 2 As shown, the detection comparator inputs the RF signal received by the omnidirectional antenna, compares it with the set reference level after detection, and outputs a TTL periodic pulse signal; the pulse stretching chip stretches the input periodic pulse signal into a DC level as a relay control signal; when the level is high, the relay is turned on, outputs a 12V control voltage, and triggers the alarm light to alarm.

[0021] The detection comparator is required to cover the frequency range of the radiation signal, in order to ensure that the detection sensitivity and dynamic range meet the requirements of the radiation signal of the radiation source, and the detection response time can ensure that the signal can be detected in the case of narrow pulses. The detection comparator uses the chip of China Electronics 13th Institute, model NC39824Q-0210. Maximum input continuous wave power (Pin): 20dBm; Recommended input power range: -10dBm~5dBm; Description of the power judgment function of this chip (whether the RF input signal power is judged): In actual applications, set the VADJ terminal to an external reference resistor R1 to adjust the internal comparator comparison voltage VADJ. The resistance calculation formula is: R1=10×VADJ / (3.2-VADJ)(kΩ), the resistance range is 2kΩ~200kΩ, and the RF signal can be judged whether it is abnormal by outputting VCMP_O1. When VPROP>VADJ, VCMP_O1 is at a high level, and it is judged that there is a radiation power signal input, and the system works normally; when VPROP<VADJ, VCMP_O1 is at a low level, and it is judged that there is no radiation power signal input, and the system works abnormally.

[0022] The pulse stretching adopts the common monostable trigger 54LS123, adopts the RC circuit, and configures the resistor and capacitor to ensure that the TTL pulse signal is stretched to a DC level under the longest cycle state. The preferred resistance value of the present invention is 37kΩ, and the capacitance value is 104pF.

[0023] The relay used is a domestic device, model JRC-10M, with an operating time of less than or equal to 4ms.

[0024] In this embodiment, the sound and light alarm light activates the sound and light alarm when the system detects a high-power radiation signal, reminding the test personnel to evacuate and avoid, ensuring that the personnel are not irradiated by the high-power signal and ensuring personal safety. At the same time, it is clear to the test equipment personnel whether the radiation source simulation target is normal.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A space microwave radiation power automatic monitoring and alarm device, characterized in that: It includes an omnidirectional antenna, a coaxial attenuator, a filter, a radio frequency detection comparison control unit, and an alarm light; the radio frequency detection comparison control unit includes a detection comparator, a pulse broadening chip, and a relay connected in sequence; the omnidirectional antenna is installed near the back lobe of the radiation source antenna to receive the back lobe signal generated when the radiation source radiates into the air; the coaxial attenuator is directly installed at the output end of the omnidirectional antenna to adjust the size of the received signal; the filter is connected to the input end of the radio frequency detection comparison control unit to select the radiation frequency of the radiation source and suppress the surrounding interference signal; the coaxial attenuator and the filter are selected according to the radiation power of the radiation source and the electromagnetic environment in which the radiation source is used; the radio frequency detection comparison control unit is connected to the alarm light to detect the received radio frequency microwave signal and send out a trigger alarm voltage; when the alarm light receives a high-power radiation signal, an alarm is sounded.

2. The automatic monitoring and alarm device for space microwave radiation power according to claim 1 is characterized in that: When the radiation source system works normally, the frequency and power of the backlobe signal received by the omnidirectional antenna are fixed.

3. The automatic monitoring and alarm device for space microwave radiation power according to claim 1 is characterized in that: The output of the radio frequency detection comparison control unit is connected to the alarm light through two wires, and the two wires are the control voltage and the ground respectively.

4. The automatic monitoring and alarm device for space microwave radiation power according to claim 1 is characterized in that: The warning light is a small LED strobe warning light with a control voltage of 12V.

5. The automatic monitoring and alarm device for space microwave radiation power according to claim 1 is characterized in that: The detection comparator detects, compares and judges the radio frequency signal received by the omnidirectional antenna, and the pulse stretching chip stretches the periodic pulse of the detection comparator to a high level as the control voltage of the relay; the relay is turned on under the action of the control voltage, and the output 12V voltage controls the alarm light to flash.

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