CN218158310U - Radio altimeter adaptation box - Google Patents
Radio altimeter adaptation box Download PDFInfo
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- CN218158310U CN218158310U CN202222547010.XU CN202222547010U CN218158310U CN 218158310 U CN218158310 U CN 218158310U CN 202222547010 U CN202222547010 U CN 202222547010U CN 218158310 U CN218158310 U CN 218158310U
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Abstract
The utility model discloses a radio altimeter adaptation box relates to radio adaptation field. The adaptation box includes: the device comprises a power supply module, and a height signal conversion module, an audio alarm module and a locking signal output module which are respectively connected with the power supply module; the height signal conversion module is a height signal conversion module which converts an input height signal of 0 to-25.000 VDC into an output height signal of 0 to + 12.500V. The utility model discloses under the prerequisite that does not change radio altimeter output interface characteristic, through radio altimeter adaptation box realizes the communication intercommunication as radio altimeter and aircraft comprehensive display management computer and/or radar warning device's connection bridge.
Description
Technical Field
The utility model relates to a radio adaptation field especially relates to a radio altimeter adaptation box.
Background
The integrated display management computer of the airplane and/or the radar warning device are provided with a radio altimeter input interface, and the existing radio altimeter is provided with an output interface communicated with the input interface. However, only after the characteristics of the output interface of the existing radio altimeter are changed, the existing radio altimeter can be communicated with the helicopter comprehensive display management computer and/or the radar warning device, and the existing radio altimeter is not convenient to use quickly and conveniently.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a radio altimeter adaptation box solves under the condition that does not change radio altimeter output interface characteristic, synthesizes the radio altimeter input interface characteristic that shows management computer and/or radar warning device through radio altimeter adaptation box adaptation.
In order to achieve the above object, the radio altimeter adaptation box of the present invention, the adaptation box includes: the device comprises a power supply module, and a height signal conversion module, an audio alarm module and a locking signal output module which are respectively connected with the power supply module; the height signal conversion module is a height signal conversion module which converts an input height signal of 0 to-25.000 VDC into an output height signal of 0 to +12.500 VDC.
Preferably, the power module is a power module which converts the received +27V direct current into +15V and-15V direct current for output.
Preferably, the power supply module is MSA2815D.
Preferably, the height signal conversion module is provided with a filter circuit, a signal voltage division circuit, a differential input circuit and a first driving amplification circuit which are sequentially connected.
More preferably, a voltage regulator tube is arranged at the output end of the first driving amplification circuit.
More preferably, the first driving amplification circuit adopts an AD811SQ as an amplification chip of the first driving amplification circuit.
Preferably, the audio alarm module comprises an audio signal generating circuit, a signal amplitude adjusting circuit and a second driving amplifying circuit which are sequentially connected; the input end of the audio signal generating circuit receives an audio alarm starting signal instruction; the output end of the second driving amplification circuit outputs an audio alarm signal; the audio alarm module further comprises a time control circuit, the input end of the time control circuit is connected with the triggering end of the audio signal generating circuit, the output end of the time control circuit is provided with a relay, and the control end of the relay is arranged on a path for outputting the audio alarm signal.
More preferably, the second driving amplification circuit adopts AD811SQ as an amplification chip of the second driving amplification circuit.
Preferably, the locking signal output module includes a CPLD logic element and an isolation chip connected to the CPLD logic element, a reset module and a locking signal generation module are disposed in the CPLD logic element, and the reset module, the locking signal generation module and the isolation chip are sequentially connected.
The utility model has the advantages that: under the prerequisite that does not change radio altimeter output interface characteristic, through radio altimeter adaptation box realizes the communication intercommunication as radio altimeter and aircraft comprehensive display management computer and/or radar warning device's connection bridge.
Drawings
Fig. 1 is a schematic structural diagram of the radio altimeter adapter box of the present invention;
FIG. 2 is a schematic diagram of the structure of the high-level signal conversion module in the radio altimeter adapter box;
FIG. 3 is a schematic diagram of the audio alert module in the radio altimeter adapter box;
fig. 4 is a schematic structural diagram of a blocking signal output module in the radio altimeter adapting box.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are given by way of illustration only.
Examples
Referring to fig. 1, the radio altimeter adapting box of the present embodiment includes: the device comprises a power module, and a height signal conversion module, an audio alarm module and a locking signal output module which are respectively connected with the power module.
The more detailed explanation is:
(I) Power supply module
The power supply module is used for converting the received direct current of +27V into two paths of direct current of +15V and-15V for output, and can be selected from INTERPOINT military grade MSA2815D.
(II) height signal conversion module
In the present embodiment, the height signal inputted to the radio altimeter adaptation box is 0 to-25.000 VDC, which the height signal conversion module converts into a height signal of 0 to +12.500 VDC. The height signal conversion module is provided with a filter circuit, a signal voltage division circuit, a differential input circuit and a first drive amplification circuit which are sequentially connected, and a schematic diagram of the height signal conversion module is shown in fig. 2.
1) Filter circuit
In this embodiment, the filter circuit is used to filter noise waves carried by the height signal during transmission, so as to improve the accuracy of the input height signal. And the input end of the filter circuit is communicated with the output interface of the radio altimeter.
2) Signal voltage division circuit
Since the range of the height signal input to the radio altimeter adapter box is 0 to-25.000 VDC, which exceeds the range of the input signal of the general operational amplifier by +13.000 to-13.000 VDC, the input height signal is first divided into 0 to-12.5 VDC and then input to the differential amplifier circuit of the next stage in the present embodiment. When the output voltage of the signal voltage dividing circuit is input to the differential amplifying circuit, the input impedance of the differential amplifying circuit is relatively large, so that the output voltage accuracy of the differential amplifying circuit is not affected by the output impedance of the signal voltage dividing circuit.
3) Differential input circuit
In the embodiment, a low-bias current and precise operational amplifier chip AD620SQ manufactured by Analog Devices is used as an input stage, a three-operational amplifier differential amplifier circuit is integrated in the chip AD620SQ, the differential amplifier circuit has the characteristics of high input impedance and effective suppression of common-mode interference, a precise resistor Rx is externally connected, and the signal amplification factor adjustable by resistance is changed.
4) First drive amplifying circuit
The output end of the first driving amplifying circuit is communicated with the altitude signal input end of the airplane comprehensive display management computer and/or the radar warning equipment. Because the output end of the differential amplifying circuit can provide the maximum driving current of 18mA, the driving current required by the present embodiment based on the actual load (1K omega) is: 12.5VDC (max)/1K (min) =12.5mA (max), and a one-stage driving circuit needs to be added in consideration of a margin. During design, AD811SQ is used as an amplification chip of the first driving amplification circuit, the first driving amplification circuit is guaranteed to provide the maximum output current of 100mA, high-frequency noise waves of output signals are filtered by magnetic beads, and noise of the output signals is reduced. And voltage limiting protection is carried out on the output end of the first driving amplification circuit by using a P6KE15A voltage regulator tube, so that the circuit is prevented from being damaged by excessive voltage.
(III) audio alarm module
When the radio altimeter adapting box receives the audio alarm starting signal of 'DH decision altitude' sent from the comprehensive display management computer, the audio alarm module arranged in the adapting box is triggered, the audio alarm module outputs the audio alarm signal, and the radio altimeter adapting box automatically stops after the audio alarm signal lasts for 2 to 3 seconds. In this embodiment, the voltage range of the audio alert signal is 5.5V to 11.0V (effective value), and the audio frequency: 1000 +/-100 Hz, signal-to-noise ratio not less than 43dB, load impedance of 600 omega, and audio alarm module as shown in FIG. 3 designed to meet the above conditions. The audio alarm module comprises an audio signal generating circuit, a signal amplitude regulating circuit and a second driving amplifying circuit which are sequentially connected; the input end of the audio signal generating circuit receives an audio alarm starting signal instruction; the output end of the second driving amplification circuit outputs an audio alarm signal; the audio alarm module further comprises a time control circuit, the input end of the time control circuit is connected with the trigger end of the audio signal generation circuit, the output end of the time control circuit is provided with a relay, and the control end of the relay is arranged on a path for outputting the audio alarm signal.
1) Audio signal generating circuit
In this embodiment, the audio signal generating circuit is integrated in the SE555JG chip, and when the input terminal of the audio signal generating circuit receives an audio alarm start signal of "DH decision height" from the integrated display management computer, the output terminal of the SE555JG chip outputs an audio alarm square wave signal, and outputs the audio alarm square wave signal to the signal amplitude adjusting circuit of the next stage. The amplitude of the audio alarm square wave signal generated by the audio signal generating circuit is approximately equal to the amplitude (about 13.5V) of the power supply of the SE555JG chip. The frequency of the target signal to be output by the adaptation box in this embodiment is 1000 ± 10 Hz, while the frequency of the audio alarm square wave signal generated by the audio signal generation circuit in this embodiment is F = 1.44/(R1 +2R 2) × C7=1067Hz, which meets the frequency requirement of the adaptation box for the target signal to be output.
2) Signal amplitude regulating circuit
In this embodiment, the adaptation box outputs an audio alarm signal with a target effective value of 5.5V to 11.0V. Because the amplitude of the audio alarm square wave signal generated by the audio signal generating circuit is 0-13.5V, the audio alarm square wave signal needs to be translated and amplified, and the audio alarm square wave signal in the target effective value range can be obtained after the audio alarm square wave signal is subjected to relevant processing by using the integrated operational amplifier OP42 AZ. In the present embodiment, the relationship between the input signal (Vi) and the output signal (Vout) of the signal-amplitude adjusting circuit is: vout = (R7 + RP 1) (-15 VDC/R5+ Vi/R3) = (2k + rp1)/10 = (Vi-6.8V). Suppose that, at this time, vout has a central value of about 0V, and the amplitude variation range: 1.4V-12.5V. The target effective values are as follows: 1.4V to 12.5V, a signal with a target effective value of 1.4V to 12.5V can be obtained by adjusting the exclusion RP1 value.
3) Second drive amplifying circuit
In this embodiment, the second driving amplifier circuit adopts AD811SQ as an amplifier chip of the second driving amplifier circuit, and the requirement for the load driving current of the audio alarm module in the radio altimeter adapter box in this embodiment is as follows: 11VDC (max)/0.6K (min) =18.3mA (max), and AD811SQ can fully satisfy the requirement because AD811SQ can provide the maximum output current of 100 mA.
4) Time control circuit
In this embodiment, the requirement of the radio altimeter adaptation box on the audio duration is as follows: and outputting an audio alarm signal by triggering a switch, and automatically stopping after the duration lasts for 2-3 s. Therefore, a time control circuit is arranged in the audio alarm module, and the function of the time control circuit is realized by an SE555JG and a relay JRC-200M.
The input end of the time control circuit is connected with the trigger end of the SE555JG, and the output end of the time control circuit is connected with the relay. When the input end of the time control circuit triggers the trigger end of the SE555JG, the time is taken as the timing starting time, and the output end of the SE555JG is low before the timing starting time; at the timing starting moment, the relay is closed, the output end of the SE555JG is high, and the output end of the SE555JG outputs a signal; and when the timing end time SE555JG is low, the relay is switched off, and a next signal output channel of the output end of the SE555JG is switched off. The duration from the timing start time to the timing end time is the time length of the audio alarm, and in the present embodiment, the duration t =1.1 × r11 × c11=2.9s.
(IV) blocking signal output module
Referring to fig. 4, the latching signal output module includes a CPLD logic element and an isolation chip connected to the CPLD logic element, a reset module and a latching signal generation module are disposed inside the CPLD logic element, and the reset module, the latching signal generation module and the isolation chip are sequentially connected. Because the periphery of the CPLD logic element is not provided with a reset key, a reset module is arranged in the CPLD logic element.
The output of the blocking signal is realized through a CPLD and an isolation chip ADUM5201, which specifically comprises the following steps: when a clock arranged outside the radio altimeter adapting box is communicated with the reset module, the reset module generates a reset signal and sends the reset signal to the blocking signal generating module, the blocking signal generating module generates a high-level pulse signal of 200us every 1S and sends the high-level pulse signal to the isolating chip, and then the isolating chip outputs the blocking signal.
Through adopting the utility model discloses an above-mentioned technical scheme has obtained following profitable effect: under the prerequisite that does not change radio altimeter output interface characteristic, through radio altimeter adaptation box realizes the communication intercommunication as radio altimeter and aircraft comprehensive display management computer and/or radar warning device's bridge of being connected.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be viewed as the protection scope of the present invention.
Claims (9)
1. A radio altimeter adapter box, characterized in that it comprises: the device comprises a power supply module, and a height signal conversion module, an audio alarm module and a locking signal output module which are respectively connected with the power supply module;
the height signal conversion module is a height signal conversion module which converts an input height signal of 0 to-25.000 VDC into an output height signal of 0 to +12.500 VDC.
2. The radio altimeter adapter box of claim 1, wherein the power module is a power module that converts the received +27V dc power into two paths of +15V and-15V dc power outputs.
3. The radio altimeter adapter box of claim 1 or 2, wherein the power supply module is MSA2815D.
4. The radio altimeter adapting box of claim 1, wherein the altitude signal converting module is provided with a filter circuit, a signal voltage dividing circuit, a differential input circuit and a first driving amplifying circuit which are sequentially connected.
5. The radio altimeter adapting box of claim 4, wherein a voltage regulator is provided at the output end of the first driving amplifying circuit.
6. The radio altimeter adapting box as claimed in claim 4 or 5, wherein the first driving amplifying circuit adopts AD811SQ as an amplifying chip of the first driving amplifying circuit.
7. The radio altimeter adapting box of claim 1, wherein the audio alarm module comprises an audio signal generating circuit, a signal amplitude adjusting circuit and a second driving amplifying circuit which are sequentially connected;
the input end of the audio signal generating circuit receives an audio alarm starting signal instruction; the output end of the second driving amplification circuit outputs an audio alarm signal;
the audio alarm module further comprises a time control circuit, the input end of the time control circuit is connected with the triggering end of the audio signal generating circuit, the output end of the time control circuit is provided with a relay, and the control end of the relay is arranged on a path for outputting the audio alarm signal.
8. The radio altimeter adapting box of claim 7, wherein the second driving amplifying circuit adopts AD811SQ as an amplifying chip of the second driving amplifying circuit.
9. The radio altimeter adapting box of claim 1, wherein the locking signal output module comprises a CPLD logic element and an isolating chip connected to the CPLD logic element, a reset module and a locking signal generating module are disposed inside the CPLD logic element, and the reset module, the locking signal generating module and the isolating chip are sequentially connected in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222547010.XU CN218158310U (en) | 2022-09-26 | 2022-09-26 | Radio altimeter adaptation box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222547010.XU CN218158310U (en) | 2022-09-26 | 2022-09-26 | Radio altimeter adaptation box |
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| Publication Number | Publication Date |
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| CN218158310U true CN218158310U (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222547010.XU Active CN218158310U (en) | 2022-09-26 | 2022-09-26 | Radio altimeter adaptation box |
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| CN (1) | CN218158310U (en) |
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- 2022-09-26 CN CN202222547010.XU patent/CN218158310U/en active Active
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