CN215867090U - Radio frequency signal delay and attenuation structure of radio height detector - Google Patents
Radio frequency signal delay and attenuation structure of radio height detector Download PDFInfo
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Abstract
The utility model provides a radio frequency signal delay and attenuation structure of a radio height detector, which comprises an optical transmitter module, an optical fiber delay line module, an optical receiver module, a radio frequency amplifier module and a program-controlled attenuator module, wherein the electrical signal input end of the optical transmitter module receives radio frequency signals, the optical signal output end of the optical transmitter module is connected with the input end of the optical fiber delay line module, the output end of the optical fiber delay line module is connected with the optical signal input end of the optical receiver module, the electrical signal output end of the optical receiver module is connected with the input end of the radio frequency amplifier module, and the output end of the radio frequency amplifier module is connected with the output end of the program-controlled attenuator module. This patent radio frequency signal time delay, decay structure through the control action of a plurality of photoswitches to the different length optic fibre light signal access combination of multistage, realizes the combination of a plurality of different time delays, and programme-controlled attenuator module realizes carrying out the decay of specific power level value to the radio frequency signal of telecommunication, and the output is sent into radio altimeter transceiver receiving antenna socket at last.
Description
Technical Field
The utility model belongs to the technical field of test and measurement of avionic equipment, and particularly relates to a radio frequency signal delay and attenuation structure of a radio height detector.
Background
The radio altitude detector is a portable first-line detection device used for checking the working state and detecting performance indexes (height measurement accuracy, sensitivity and the like) of a radio altitude meter on an airplane. The radio height detector generally comprises 3 functional module components such as a radio frequency signal delay/attenuation component, a control display component and a power supply component (as shown in fig. 1): a radio frequency modulation signal (the carrier frequency is 4.3GHz) output by a 'transmitting antenna' socket of a transceiver of the radio altimeter to be tested is sent to a radio frequency signal delay/attenuation component through a transmitting antenna cable, and after the radio frequency signal delay/attenuation component carries out time delay (corresponding to different simulated height values) and power attenuation (simulating the power of radio frequency signals under different height values) of different values, the radio frequency signal delay/attenuation component sends the radio frequency modulation signal back to the 'receiving antenna' socket of the transceiver of the radio altimeter to be tested through a receiving antenna cable, so that simulation of different flight height values is realized; the control display component controls a delay line selection control signal and a power attenuation value setting control signal which are required by the radio-frequency signal delay/attenuation component, and displays a set analog height value and an attenuation power value; the power supply assembly provides the required operating voltage for the radio frequency signal delay/attenuation assembly and the control display assembly.
The radio frequency signal delay/attenuation component is a core functional component of the radio height detector, a key signal processing structural component in the radio frequency signal delay/attenuation component is a radio frequency signal delay line, and the radio frequency signal delay line is used for performing time delay (time delay) with different values on radio frequency modulation signals output by a transmitting antenna socket of a transceiver of the radio altimeter to be detected, so that different required analog height values are generated.
In the existing radio height detector product, the radio frequency signal delay/attenuation component usually adopts the coaxial cable or the surface acoustic wave delay line and other structural components as the radio frequency signal delay line, and is limited by the factors such as volume, weight or price, and the existing radio height detector adopting the coaxial cable or the surface acoustic wave delay line and other structural components as the radio frequency signal delay line has the problems of small number of radio frequency signal delay lines, small time delay point value and small number of simulated height values, and can not meet the requirements of the radio height meter on large number of simulated height values during the comprehensive working state inspection and the accurate performance index detection.
SUMMERY OF THE UTILITY MODEL
The utility model provides a radio frequency signal delay and attenuation structure of a radio height detector, which solves the problems that the radio frequency signal delay/attenuation component of the radio height detector has small quantity of analog height values and can not meet the requirements of the radio altimeter on overall working state inspection and accurate performance index detection.
The utility model provides a radio frequency signal delay and attenuation structure of a radio height detector, which comprises an optical transmitter module, an optical fiber delay line module, an optical receiver module, a radio frequency amplifier module and a program-controlled attenuator module, wherein the electrical signal input end of the optical transmitter module receives a radio frequency signal from a transmitting antenna socket of an altimeter transceiver, the optical signal output end of the optical transmitter module is connected with the input end of the optical fiber delay line module, the output end of the optical fiber delay line module is connected with the optical signal input end of the optical receiver module, the electrical signal output end of the optical receiver module is connected with the input end of the radio frequency amplifier module, the output end of the radio frequency amplifier module is connected with the output end of the program-controlled attenuator module, and the optical fiber delay line module is controlled by an optical fiber delay line selection control signal generated by a control display component of the radio height detector, the time delay of different values is realized through different optical fiber delay lines, and the programmable attenuator module attenuates the radio frequency electric signal with different power level values under the control of a power attenuation value setting control signal generated by a radio height detector control display component.
Preferably, the optical transmitter module includes an impedance matching circuit, an LD light source, a dc bias circuit, an automatic power control circuit, an automatic temperature control circuit, and an optical isolator, wherein an input end of the impedance matching circuit receives a radio frequency signal from the transmitting antenna socket of the altimeter transceiver, an output end of the impedance matching circuit is connected to an input end of the LD light source, an input end of the LD light source is further connected to the dc bias circuit, the automatic power control circuit, and the automatic temperature control circuit, an output end of the LD light source is connected to the optical isolator, and the optical isolator outputs an optical signal.
Preferably, the optical fiber delay line module is composed of a plurality of sections of optical fiber delay lines with different lengths and a plurality of optical switches.
Preferably, the number of the optical fiber delay line modules, the length of the optical fiber delay line of each optical fiber delay line module, and the number of the optical switches are set according to the radio altitude simulation quantity range and the accuracy requirement.
Preferably, the optical fiber delay line module is composed of nine optical fiber delay lines with different lengths, two 1 × 2 optical switches, eight 2 × 2 optical switches and an optical switch drive control circuit.
Preferably, the lengths of the nine fiber delay lines are 13.6m, 27.2m, 40.8m, 54.4m, 136m, 272m, 408m, 544m and 1360m respectively.
Preferably, the optical switch is a magneto-optical switch.
The utility model has the beneficial effects that:
compared with the existing radio frequency signal delay/attenuation component of the radio height detector, which adopts the coaxial cable or the surface acoustic wave delay line and other structural components as the radio frequency signal delay line, the radio frequency signal delay and attenuation structure of the radio height detector of the patent adopts a plurality of sections of optical fibers with different lengths and a plurality of optical switches, the control function of the optical switches on the combination of the optical signal paths of the optical fibers with different lengths is realized, the combination of a plurality of different delays is realized, the programmable attenuator module sets a control signal according to the power attenuation value generated by the control display component of the radio height detector, the radio frequency signal is attenuated according to the specific power level value, and finally the radio frequency signal is output and sent to the receiving antenna socket of the transceiver of the radio height meter, thereby having the following advantages and positive effects:
1) the time delay point value is large, the number of the simulation height values is large, and the method is particularly suitable for being used in occasions of detecting multiple simulation height measurement values and accurate performance of the radio altimeter;
2) a program-controlled attenuator module is added, so that the sensitivity parameters of the transceiver of the radio altimeter can be tested;
3) the product is reliable, and the working performance is stable;
4) the equipment has small volume, light weight and high cost performance.
Drawings
FIG. 1 is a block diagram of the functional components of a prior art radio height detector,
FIG. 2 is a block diagram of the delay and attenuation structure of the radio frequency signal of the radio height detector,
figure 3 is a schematic block diagram of an optical transmitter module,
fig. 4 is a schematic block diagram of a fiber delay line module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and should not be construed as limiting the scope of the utility model.
As shown in fig. 2, this embodiment provides a radio frequency signal delay and attenuation structure for a radio height detector, which includes an optical transmitter module, an optical fiber delay line module, an optical receiver module, an rf amplifier module, and a programmable attenuator module, where an electrical signal input end of the optical transmitter module receives a radio frequency signal from an antenna socket of a transceiver of an altimeter, an optical signal output end of the optical transmitter module is connected to an input end of the optical fiber delay line module, an output end of the optical fiber delay line module is connected to an optical signal input end of the optical receiver module, an electrical signal output end of the optical receiver module is connected to an input end of the rf amplifier module, an output end of the rf amplifier module is connected to an output end of the programmable attenuator module, the optical fiber delay line module is controlled by an optical fiber delay line selection control signal generated by a control display component of the radio height detector, the time delay of different values is realized through different optical fiber delay lines, and the programmable attenuator module attenuates the radio frequency electric signal with different power level values under the control of a power attenuation value setting control signal generated by a radio height detector control display component.
The optical fiber delay line module is a core module and is used for realizing optical domain time delay. The optical transmitter module, the optical receiver module and the radio frequency amplifier module are accessory and matched modules thereof. The program-controlled attenuator module is used for testing sensitivity parameters of the altimeter transceiver.
The optical transmitter module converts radio frequency modulation electric signals from a transmitting antenna socket of the transceiver of the radio altimeter into optical signals to realize an electric/optical (E/O) conversion function, and injects the optical signals into the optical fiber delay line module to prepare for optical signal time delay in the optical fiber delay line module; the optical fiber delay line module utilizes the characteristic that optical fibers have a delay effect on optical signals, and realizes time delay (corresponding to different analog height values) with different values through different optical fiber delay lines under the control of optical fiber delay line selection control signals generated by the control display component of the radio height detector; the optical fiber delay line module adopts a plurality of sections of optical fibers with different lengths and a plurality of optical switches, realizes the combination of different time delays of the optical fibers with different lengths through the switching control function of the optical switches on the combined passages of the optical fibers with different lengths, further realizes the time delay with different numerical values (corresponding to different analog height values), and then injects the optical fiber delay line module into the optical receiver module; the optical receiver module converts the optical signal from the optical fiber delay line module into a radio frequency electric signal to realize an optical/electrical (O/E) conversion function and sends the radio frequency electric signal to the radio frequency amplifier module; the radio frequency amplifier module amplifies the amplitude of the radio frequency electric signal transmitted by the optical receiver module and then transmits the radio frequency electric signal to the program-controlled attenuator module; the program-controlled attenuator module attenuates the radio frequency electric signal with different power level values under the control of a power attenuation value setting control signal generated by the radio height detector controlling the display component, and finally outputs and sends the radio frequency electric signal to a receiving antenna socket of a radio height meter transceiver.
As a preferred implementation of this embodiment, referring to fig. 3, the optical transmitter module adopts a direct Intensity Modulation (IM) type electro-optical modulator circuit structure, which is composed of an impedance matching circuit, an LD light source, a dc bias circuit, an automatic power control circuit, an automatic temperature control circuit, and an optical isolator, and completes the conversion of a radio frequency electrical signal from a "transmitting antenna" socket of a radio altimeter transceiver into an optical signal, thereby implementing an electrical/optical (E/O) conversion function. The input end of the impedance matching circuit receives radio frequency signals from an antenna socket of a transmitting antenna of the altimeter transceiver, the output end of the impedance matching circuit is connected with the input end of the LD light source, the input end of the LD light source is further connected with the direct current bias circuit, the automatic power control circuit and the automatic temperature control circuit, the output end of the LD light source is connected with the optical isolator, and the optical isolator outputs optical signals.
As a preferred embodiment of this embodiment, referring to fig. 4, the fiber delay line module comprises nine fiber delay lines FDL1, FDL2, FDL3, FDL4, FDL5, FDL6, FDL7, FDL8, FDL9, two 1 × 2 optical switches K1 and K10, eight 2 × 2K2, K3, K4, K5, K6, K7, K8, and K9, and an optical switch drive control circuit. The nine fiber delay lines FDL1, FDL2, FDL3, FDL4, FDL5, FDL6, FDL7, FDL8 and FDL9 have lengths of 13.6m, 27.2m, 40.8m, 54.4m, 136m, 272m, 408m, 544m and 1360m, respectively. The optical switches of the present embodiment are all magneto-optical switches. The optical switch drive control circuit receives the optical fiber delay line selection control signal sent by the transceiver control display component of the radio altimeter, so that the optical switch drive control circuit generates an electric pulse sequence control signal to control the 'through' and 'cross' working states of 21 × 2 magneto-optical switches (K1 and K10) and 8 2 × 2 magneto-optical switches (K2, K3, K4, K5, K6, K7, K8 and K9)), thereby controlling the access state of 9 optical fiber delay lines (FDL1, FDL2, FDL3, FDL4, FDL5, FDL6, FDL7, FDL8 and FDL9), leading the optical signal transmitted by the optical transmitter module to be transmitted by the optical fiber line formed by the optical fiber delay lines with different lengths, in the transmission process, because the lengths of the optical fiber lines are different, time delays with different values are generated on optical signals, and then the optical signals are output to an optical receiver module, the time delay of the radio frequency electric signal output by the antenna socket of the transmitting of the transceiver of the radio altimeter in the optical domain is realized.
The fiber delay line and the optical switch are core circuit devices in the fiber delay line module. The optical fiber delay line works based on the advantages that when an optical fiber (especially a single mode optical fiber) is used as an optical signal transmission medium, the optical fiber delay line has small transmission loss, wide transmission bandwidth, strong anti-electromagnetic interference capability, small volume, light weight, constant optical signal transmission rate, stable transmission delay performance (high delay precision) and the like; the optical switch has the advantages of high optical signal switching speed, small insertion loss, simple switch control relation and the like.
The fiber delay line module of the embodiment can realize 211 simulation height value tests in an YWG-2 type radio height detector. Table 1 shows only the time delay value values corresponding to 10 analog height values 0m, 10m, 20m, 30m, 40m, 100m, 200m, 300m, 400m, 1000 m. The optical fiber delay lines with different lengths play a role of a transmission line for carrying out different time delays on the passing optical signals; the optical switch array formed by a plurality of optical switches and optical switch driving control circuits performs switching control on different optical fiber transmission delay lines so as to realize different delays, and the rest 201 analog height values are realized by optical fiber delay lines with different lengths in a combined delay mode.
Table 1 radio height detector 10 analog height values and signal delay value, optical fiber delay line length corresponding relation table
As a preferred implementation of this embodiment, the optical receiver module adopts a relatively mature Direct Detection (DD) optical receiver circuit structure, and adopts a PIN photodiode to detect an optical signal, so as to convert the optical signal into a photo-generated current signal, thereby implementing an optical/electrical (O/E) conversion function. The optical signal from the optical fiber delay line is converted into a radio frequency electric signal, so that an optical/electrical (O/E) conversion function is realized, and the radio frequency electric signal is sent to a radio frequency amplifier module. The radio frequency amplifier module amplifies the radio frequency electric signal transmitted by the optical receiver module and then transmits the radio frequency electric signal to the program-controlled attenuator module. The program-controlled attenuator module sets a control signal according to a power attenuation value generated by the radio height detector for controlling the display component, attenuates the radio frequency electric signal according to a specific power level value, and finally outputs and sends the radio frequency electric signal to a receiving antenna socket of a radio altimeter transceiver.
Claims (7)
1. A radio frequency signal delay and attenuation structure of a radio height detector is characterized in that: the high-power radio height detection device comprises an optical transmitter module, an optical fiber delay line module, an optical receiver module, a radio frequency amplifier module and a program-controlled attenuator module, wherein the electrical signal input end of the optical transmitter module receives radio frequency signals from a transmitting antenna socket of an altimeter transceiver, the optical signal output end of the optical transmitter module is connected with the input end of the optical fiber delay line module, the output end of the optical fiber delay line module is connected with the optical signal input end of the optical receiver module, the electrical signal output end of the optical receiver module is connected with the input end of the radio frequency amplifier module, the output end of the radio frequency amplifier module is connected with the output end of the program-controlled attenuator module, the optical fiber delay line module realizes time delay with different values through different optical fiber delay lines under the control of an optical fiber delay line selection control signal generated by a radio height detection device control display assembly, and the program-controlled attenuator module sets a control attenuation value generated by the radio height detection device control display assembly And under the control of the control signal, the radio frequency electric signal is attenuated by different power level values.
2. The radio frequency signal delay and attenuation structure of the radio height detector according to claim 1, wherein: the optical transmitter module comprises an impedance matching circuit, an LD light source, a direct current bias circuit, an automatic power control circuit, an automatic temperature control circuit and an optical isolator, wherein the input end of the impedance matching circuit receives radio-frequency signals from an altimeter transceiver transmitting antenna socket, the output end of the impedance matching circuit is connected with the input end of the LD light source, the input end of the LD light source is further connected with the direct current bias circuit, the automatic power control circuit and the automatic temperature control circuit, the output end of the LD light source is connected with the optical isolator, and the optical isolator outputs optical signals.
3. The radio frequency signal delay and attenuation structure of the radio height detector according to claim 1, wherein: the optical fiber delay line module is composed of a plurality of sections of optical fiber delay lines with different lengths and a plurality of optical switches.
4. The radio frequency signal delay and attenuation structure of the radio height detector according to claim 3, wherein: the number of the optical fiber delay line modules, the length of the optical fiber delay line of each optical fiber delay line module and the number of the optical switches are set according to the range of the radio height analog quantity value and the accuracy requirement.
5. The radio height detector radio frequency signal delay and attenuation structure of claim 4, wherein: the optical fiber delay line module is composed of nine optical fiber delay lines with different lengths, two 1 multiplied by 2 optical switches, eight 2 multiplied by 2 optical switches and an optical switch drive control circuit.
6. The radio height detector radio frequency signal delay and attenuation structure of claim 5, wherein: the lengths of the nine optical fiber delay lines are respectively 13.6m, 27.2m, 40.8m, 54.4m, 136m, 272m, 408m, 544m and 1360 m.
7. The radio height detector radio frequency signal delay and attenuation structure of claim 5, wherein: the optical switch selects a magneto-optical switch.
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| CN113534079A (en) * | 2021-08-03 | 2021-10-22 | 中国人民解放军海军航空大学青岛校区 | Radio frequency signal delay and attenuation structure of radio height detector |
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| CN113534079A (en) * | 2021-08-03 | 2021-10-22 | 中国人民解放军海军航空大学青岛校区 | Radio frequency signal delay and attenuation structure of radio height detector |
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