CN113359124A - Airborne hover indicator - Google Patents
Airborne hover indicator Download PDFInfo
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- CN113359124A CN113359124A CN202110551949.0A CN202110551949A CN113359124A CN 113359124 A CN113359124 A CN 113359124A CN 202110551949 A CN202110551949 A CN 202110551949A CN 113359124 A CN113359124 A CN 113359124A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 67
- 238000012545 processing Methods 0.000 claims abstract description 66
- 238000001914 filtration Methods 0.000 claims abstract description 22
- 230000006870 function Effects 0.000 claims abstract description 8
- 230000001629 suppression Effects 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 238000013500 data storage Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 5
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 2
- 238000004132 cross linking Methods 0.000 claims description 2
- 238000013524 data verification Methods 0.000 claims 1
- 230000004297 night vision Effects 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
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- 230000033228 biological regulation Effects 0.000 description 4
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
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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
- G01S7/04—Display arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The invention provides an airborne hovering indicator, which mainly solves the problems of low airborne speed indicating precision and poor environmental adaptability in the prior art. The scheme is that the functions of digital receiving, fault detection, night vision compatibility, electromagnetic compatibility and online upgrading are added on the basis of keeping the existing analog input mode. The structure includes: power supply circuit board, treater circuit board and display module. The power supply circuit board performs EMI filtering surge and numerical value conversion on the input direct-current voltage and then outputs the direct-current voltage to the processor circuit board and the display assembly; the processor circuit board judges the state of the signals input by the radar on the carrier, analyzes the speed of the carrier, processes the signals and outputs the processed signals to the display component for display. The invention improves the indicating precision by receiving the three-axis speed of the carrier and the radar state information measured by the Doppler radar and indicating the three-axis small speed of the carrier in the hovering state in real time in a pointer mode after processing, meets the requirements of electromagnetic compatibility and night vision green, and can be used for a Doppler navigation system.
Description
Technical Field
The invention belongs to the technical field of instruments and meters, and particularly relates to a hovering indicator which can be used for a Doppler navigation system.
Background
An airborne hovering indicator is an instrument device for hovering speed indication by receiving triaxial speed data provided by a multi-general radar, is provided with a digital display interface, and can visually display vertical, forward and lateral carrier speeds. Meanwhile, the system has the functions of night vision compatibility, fault detection and firmware upgrading during operation.
At present, hover pointing devices are mostly of a mechanical pointer type or an analog type, wherein:
the mechanical pointer type mechanical type adopts an electromagnetic moving coil pointer structure design, and a current speed value and a search locking state of a radar are expressed by driving a pointer to deflect through a coil. The pointer type structure is greatly influenced by the environment, has a complex structure, is difficult to maintain, and has strict packaging, transportation and storage conditions which are not suitable for relatively complex environmental requirements.
The analog type is to amplify the input dc low-speed signal and then drive the LED light emitting bank to emit light through the comparison circuit, or to adjust the analog signal and then perform AD sampling, filtering, unit conversion, and other processing for display. The analog type is not beneficial to the pilot to judge the current hovering state of the aircraft due to large structural error; meanwhile, the electromagnetic compatibility is poor, so that the method is difficult to adapt to relatively complex environmental requirements; in addition, the fault state of the system equipment cannot be prompted, and the equipment cannot perform online software upgrading, so that the system and the equipment cannot be maintained.
Disclosure of Invention
The invention aims to provide an airborne hovering indicator with a new structure aiming at the defects of the prior art, so as to improve the indicating resolution, prompt equipment faults in time, improve the maintainability of a system, meet the relatively complex environmental requirements of electromagnetic compatibility and night vision green and help a pilot to accurately judge the hovering state.
In order to achieve the purpose, the airborne hovering indicator comprises a power supply circuit board, a processor circuit board and a display component, wherein the input end of the processor circuit board is connected with a Doppler radar on an airborne machine, and the output end of the processor circuit board is connected with the display component, and the airborne hovering indicator is characterized in that: the processor circuit board comprises a voltage adjusting unit, a digital protocol conversion unit, a digital processing unit and a secondary power supply conversion unit;
the voltage adjusting unit includes: an analog regulation circuit, a discrete magnitude regulation circuit;
the digital protocol conversion unit includes: the conversion circuit of the aerobus standard ARINC429 protocol and the conversion circuit of the balanced voltage digital interface RS422 protocol are respectively used for converting the ARINC429 protocol into a serial peripheral equipment interface SPI protocol format and converting the RS422 protocol into a serial data bus URAT protocol;
the digital processing unit includes:
the analog-to-digital conversion AD processing module is used for carrying out AD sampling processing on the analog signal regulated by the analog regulating circuit;
the SPI processing module is used for analyzing the state information of the Doppler radar of the data output by the ARINC429 protocol conversion circuit to generate an image frame;
the display data processing module is used for converting the image frame data generated by the SPI processing module into RGB565 standard protocol data and sending the data to the data storage module;
the data storage module is used for temporarily storing the data sent by the display data processing module and sending the data to the display assembly at regular time;
the UART processing module is used for analyzing data sent by the RS422 protocol conversion circuit, realizing on-line upgrading of software, and realizing the functions of brightness adjustment and day-night switching of a display screen by cross-linking the universal asynchronous receiving-transmitting transmitter UART and a display assembly;
the interruption processing module is used for judging the Doppler radar speed state discrete quantity sent by the discrete quantity regulating circuit, and sending the processed discrete quantity to the display component for displaying;
the secondary power supply conversion unit consists of a DC-DC module and is used for converting a +12V power supply input by the power supply circuit board into +3.3V power supply and outputting the +3V power supply to the digital protocol conversion unit and the digital processing unit.
Further, the power circuit board comprises a filtering surge suppression unit, a power protection unit and a direct current power conversion DC-DC unit: the filtering surge suppression unit consists of an anti-reverse circuit and a filtering surge circuit, and direct-current voltage output by the anti-reverse circuit is respectively output to the power supply protection unit and the display assembly after electromagnetic compatibility filtering and power supply peak surge suppression are carried out by the filtering surge circuit; the power supply protection unit consists of an impact current control circuit and a power failure protection circuit, and the direct current voltage output by the impact current control circuit is output to the direct current voltage conversion unit after energy storage is carried out on the direct current voltage by the power failure protection circuit;
the direct-current voltage conversion unit is composed of a direct-current power supply conversion DC-DC module and is used for converting a +28V direct-current power supply input by the power supply protection unit into a +/-12V DC working power supply and a +12V DC working backlight power supply and outputting the +/-12V DC working power supply and the +12V DC working backlight power supply to the processor circuit board and the display assembly respectively.
Further, the voltage adjusting unit is composed of an analog adjusting circuit and a discrete magnitude adjusting circuit, the analog adjusting circuit adjusts the voltage of the analog voltage input by the Doppler radar and outputs the adjusted voltage to the analog-to-digital conversion AD processing module, and the discrete magnitude adjusting circuit adjusts the discrete voltage input by the Doppler radar and outputs the adjusted voltage to the interrupt processing module.
Further, the digital protocol conversion unit comprises an ARINC429 protocol conversion circuit and an RS422 protocol conversion circuit, wherein the ARINC429 protocol conversion circuit is composed of an ARINC429 protocol module and is used for converting an ARINC429 protocol input by the Doppler radar into an SPI protocol and outputting the SPI protocol to the SPI processing module; the RS422 protocol conversion circuit is composed of an RS422 protocol module and is used for converting an RS422 protocol input by a personal computer PC into a UART protocol and outputting the UART protocol to the UART processing module.
Furthermore, the display assembly is composed of a backlight driving unit, an LCD unit and a light guide plate unit, wherein the backlight driving unit is respectively connected with the LCD unit in a bidirectional way and is connected with the light guide plate unit in a unidirectional way, and is used for providing a power supply, displaying data and controlling a preheating mode for the LCD unit and collecting key information on the light guide plate unit; the LCD unit carries out terminal display on display data input by the backlight driving unit, collects temperature information on a screen in real time through a temperature sensor and outputs the temperature information to the backlight driving board.
Compared with the prior art, the invention has the following advantages:
1. high indicating resolution
By adopting a digital input mode, the invention enhances the anti-interference capability of signals, reduces the speed measurement error and improves the speed measurement resolution; meanwhile, the resolution is improved from 2.5km/h to 0.5km/h by filtering the input speed information and adopting a high-resolution display screen.
2. High maintainability
The invention generates image frames by analyzing the state information transmitted by the Doppler radar, and can position a unit module generating faults by utilizing fault codes displayed by the image frames; meanwhile, due to the addition of a digital interface RS422 protocol conversion circuit, online upgrade is completed in an interrupt handshake mode, and maintainability of the radar and the airborne hovering indicator is improved.
3. Has high environmental adaptability
Because the filtering surge suppression unit and the power supply protection unit are additionally arranged, the electromagnetic compatibility can be improved, and the requirement of the electromagnetic compatibility of the carrier is met; meanwhile, the display assembly with night vision compatibility is selected, so that the requirement of the aerial carrier for night vision is met, and the adaptability to different environments is improved.
Drawings
FIG. 1 is a system block diagram of the present invention;
FIG. 2 is a block diagram of the power circuit board structure of the present invention;
FIG. 3 is a block diagram of the circuit board structure of the processing board of the present invention;
FIG. 4 is a block diagram of a display module according to the present invention.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, the present example includes a power supply circuit board 1, a processor circuit board 2, and a display module 3; the power circuit board 1 is respectively connected with the processor circuit board 2 and the display component 3 in a one-way mode, and has two functions, one is used for voltage conversion, converting a +28V power supply input from outside into a +/-12V direct-current working power supply and a +12V direct-current working backlight power supply, and respectively supplying power to the processor circuit board 2 and the display component 3, and the other is used for signal transfer, so that the hovering indicator is compact in internal structure, and the embodiment directly outputs an analog three-axial-speed and discrete-quantity effective flag signal, an ARINC429 digital three-axial-speed signal and an RS422 program on-line upgrading signal input from outside to the processor circuit board 2 through a connector on the power circuit board 1 without any processing;
the processor circuit board 2 is connected with the display component 3 through two paths, wherein one path is in one-way connection and is used for performing voltage regulation on input analog signals and discrete magnitude signals, performing protocol conversion on an ARINC429 protocol and an RS422 protocol, performing data extraction and processing on signals after the voltage regulation and the protocol conversion, and transmitting image frames to the display component 3 through an RGB565 interface; the other path is in bidirectional connection, receives different key information input by the display component 3 and outputs corresponding instructions;
the display component 3 is used for displaying the terminal of the equipment, displaying the image information on the display screen, outputting the key information to the processor circuit board 2, and finishing the functions of brightness control and day and night switching according to the instruction input by the processor circuit board 2.
Referring to fig. 2, the power circuit board 1 includes a filtering surge suppression unit 11, a power protection unit 12, and a dc voltage conversion unit 13; wherein
The filtering surge suppression unit 11 comprises an anti-reverse circuit 111 and a filtering surge circuit 112, wherein the anti-reverse circuit 111 is designed in a diode mode and is used for performing anti-reverse design on an externally input power signal, preventing equipment from being damaged when the positive electrode and the negative electrode of a power supply are reversely connected, and outputting the power signal to the filtering surge circuit 112; the filtering surge circuit 112 is composed of a filtering and surge two-in-one module, and is used for performing electromagnetic interference (EMI) filtering, peak and surge suppression on a power supply signal input by the anti-reverse circuit 111, so that the equipment meets the electromagnetic compatibility requirement of an aircraft, and the output of the equipment is respectively sent to the power supply protection unit 12 and the display component 3;
the power protection unit 12 comprises an impulse current control circuit 121 and a power failure protection circuit 122, wherein the impulse current control circuit 121 is composed of a resistor and a diode circuit, and is used for limiting impulse current generated at the moment of power-on of equipment, protecting the safety of the whole machine, and outputting the impulse current to the power failure protection circuit 122; the power-down protection circuit 122 is composed of an energy storage capacitor, and is used for performing a 50ms power-down protection circuit on the power input by the impact current control circuit 121, so as to prevent data loss in the data processing unit 23 when the power is switched outside the carrier;
the direct-current voltage conversion unit 13 is composed of a direct-current power supply conversion DC-DC module, and is configured to convert the voltage of the power supply input by the power supply protection unit 12, and supply power to the processor circuit board 2 and the display module 3.
Referring to fig. 3, the processor circuit board 2 includes a voltage adjusting unit 21, a digital protocol converting unit 22, a digital processing unit 23, and a secondary power converting unit 24; wherein
The voltage adjusting unit 21 comprises an analog adjusting circuit 211 and a triode adjusting circuit 212, wherein the analog adjusting circuit 211 comprises an operational amplifier, a voltage reference chip and a peripheral circuit, and is used for adjusting a-5V- +5V analog voltage mode sent by the doppler radar, converting the analog voltage mode into 0V- +3V and then outputting the converted analog voltage mode to the AD processing module 231; the triode regulating circuit 212 consists of a triode and a peripheral resistor and is used for regulating the voltage of a 0V/+5V discrete magnitude signal sent by the Doppler radar, converting the signal into 0V/+3.3V and then outputting an interrupt processing module;
the digital protocol conversion unit 22 comprises an ARINC429 protocol conversion circuit 221 and an RS422 protocol conversion circuit 222, wherein the ARINC429 protocol conversion circuit 221 is composed of an ARINC429 protocol conversion chip and a peripheral circuit, and is used for converting an ARINC429 input by the doppler radar into an SPI protocol capable of being analyzed by the digital processing unit 23, compared with a traditional mode of converting the SPI protocol into a GPIO, the SPI protocol has the advantages of less occupied IO resources and high transmission efficiency, and the output is sent to the SPI processing module 232 after the protocol conversion is completed; the RS422 protocol conversion circuit 222 is composed of an RS422 protocol chip and a peripheral circuit, and is configured to convert an RS422 protocol input by a PC into a UART protocol that can be analyzed by the digital processing unit 23, and output the UART protocol to the UART processing module 235;
the digital processing unit 23 includes an analog-to-digital conversion AD processing module 231, an SPI processing module 232, a display data processing module 233, a data storage module 234, a UART processing module 235, and an interrupt processing module 236, which perform different processing functions, that is:
the analog-to-digital conversion AD processing module 231 is configured to perform AD sampling processing on the analog signal adjusted by the analog adjusting circuit 211, and perform AD conversion mode selection, sampling rate configuration, AD calibration, and the like through a configuration register to complete analog-to-digital conversion;
the SPI processing module 232 is configured to analyze the state information of the doppler radar from the data output by the ARINC429 protocol conversion circuit 221, and generate an image frame, that is, when the system is powered on, send an instruction to the ARINC429 protocol conversion circuit 221 to complete circuit self-checking, so as to ensure that the circuit can work normally, and then analyze the state information input by the doppler radar, and if the circuit or the radar has a fault, directly generate a state image frame, and if the radar has no fault, extract forward, lateral, and vertical speed information of the aircraft, perform filtering processing, and generate a pointer position image frame. The two image frames are generated as follows:
the generation of the status image frame is: firstly, initializing a fault tree image frame into a root node of a red-black tree, and adding each default sub-image node to the tree according to the display content requirement, wherein each sub-image represents an image module element which is finally required to be displayed in the image frame. When new fault information of the radar or the hovering indicator is received, the fault information is converted into sub-image frame information, the sub-image frame is initialized to be a red-black tree node, and the sub-image frame information comprises information such as related sub-image names, RAM starting addresses, line length and column lengths, line space offset and the like. And after the initialization is finished, adding the newly input sub-image frame nodes into the red-black tree of the fault image frame of the radar or the hovering indicator, and relocating the nodes to the positions of the nodes with the same name as the sub-image by the red-black tree of the fault image frame and replacing the nodes.
The pointer position image frame is generated as follows: the pointer image frame is initialized to a red-black tree first, except that default sub-image nodes are added as required by the pointer display. And then converting the extracted and processed carrier speed information pointer into a red-black tree node representing the subimage, adding the red-black tree node into a red-black tree of the pointer image frame, and finally searching and replacing the node with the same name as the subimage by the red-black tree.
The display data processing module 233 is configured to convert the image frame data generated by the SPI processing module 232 into RGB565 standard protocol data, and complete data conversion by configuring a direct memory to store a clock, a priority, and a cycle mode of the DMA, and the DMA has the advantages of high efficiency in data transmission between registers and no occupation of a CPU;
the data storage module 234 is configured to temporarily store the data sent by the display data processing module 233, where the storage method includes:
firstly, generating two linked lists, wherein one linked list is used as an idle memory indication linked list and is used for inserting the initial address and size data of an available memory space; the other one is used as an allocated memory indication linked list and is used for inserting the initial address and the size data of the occupied memory space;
secondly, memory application is carried out, namely the program transmits the required size data, and the system searches the minimum RAM block meeting the requirements in the idle indication chain table: if the space is larger than the required size, splitting the RAM space from the head according to a fixed size, and distributing according to the requirement after splitting is completed;
then, memory release is carried out, namely, a program transmits a pointer for releasing a memory block, data block information aligned with the pointer is searched in an allocated linked list, the memory data in the memory block is taken out from the allocated linked list, the pointer is added into an idle memory indication linked list, and the idle memory indication linked list judges whether a space area continuous with the memory block exists according to the added information: if yes, they are merged, if not, they are added to the corresponding position of the linked list according to the size sequence of the initial address.
The storage method can ensure the byte alignment of the memory space, reduce the operation time when the memory is frequently applied for releasing, and improve the memory performance of the system;
the UART processing module 235 is used for on-line upgrading of programs and key instruction analysis, wherein, during software upgrading, firstly, a personal computer PC sends an interrupt request through an RS422 protocol conversion circuit 222, then, the processing module and the PC carry out software handshake, if the handshake succeeds, data downloading and data checking are carried out, and data which is checked to be correct is output to a memory to complete the software upgrading, otherwise, the handshake is carried out again; when analyzing the key command, the corresponding command is sent to the display component 3 according to different key information input by the display component 3.
The interrupt processing module 236 is configured to determine the doppler radar state discrete magnitude sent by the discrete magnitude adjustment circuit 212, determine the state by configuring a GPIO pin, an interrupt mode, and a priority, generate a pointer position image frame if the radar operates normally, and generate a fault image frame if the radar fails.
Referring to fig. 4, the display assembly 3 includes a backlight driving unit 31, an LCD unit 32 and a light guide plate unit 33, where the backlight driving unit 31 is respectively connected to the LCD unit 32 in two directions, and is used to provide power to the LCD unit 32, output display data, collect screen temperature on the LCD unit 32 and control a preheating mode of the screen; is unidirectionally connected with the light guide plate unit 33 and is used for collecting the key information on the light guide plate unit (33). When the LCD unit 32 works, screen temperature data acquired by the temperature sensor is transmitted to the backlight driving unit 31 in real time, the backlight driving unit 31 controls the preheating mode according to temperature information, if the temperature is lower than minus 25 ℃, power is supplied to conductive glass on the LCD unit 32, the preheating mode is started, and if the temperature is higher than minus 20 ℃, the preheating mode is closed after power is cut off; then, the backlight driving unit 31 converts the RGB565 video screen signals containing the forward, lateral, vertical speed and status information of the carrier, which are input by the processor circuit board 2, into constant current signals of white, red, green and blue light, which are output to the LCD unit 32 for image display; if the screen brightness adjustment and day and night switching are required, the light guide plate 33 outputs different key information to the backlight driving unit 31, the backlight driving unit 31 converts the key information after de-jittering into a UART protocol and outputs the UART protocol to the UART processing module 235, and the adjustment of the screen brightness and day and night switching functions are completed according to an instruction fed back by the UART processing module 235.
On the basis of keeping the traditional analog input mode, the digital ARINC429 data input by the Doppler radar is analyzed by adding the digital input mode, the speed information of the carrier is extracted and processed, and finally the forward speed, the lateral speed and the vertical speed of the carrier in a hovering state are indicated on the display assembly in real time in a pointer mode.
The foregoing description is only an example of the present invention and is not intended to limit the invention, so that it will be apparent to those skilled in the art that various changes and modifications in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. The utility model provides an airborne hover indicator, includes power supply circuit board (1), processor circuit board (2) and display module (3), and the input of processor circuit board (2) links to each other with the Doppler radar on the carrier, and the output links to each other its characterized in that with display module (3): the processor circuit board (2) comprises a voltage adjusting unit (21), a digital protocol conversion unit (22), a digital processing unit (23) and a secondary power supply conversion unit (24);
the voltage adjustment unit (21) includes: an analog adjustment circuit (211), a discrete quantity adjustment circuit (212);
the digital protocol conversion unit (22) comprises: an aerobus standard ARINC429 protocol conversion circuit (221) and a balanced voltage digital interface RS422 protocol conversion circuit (222) respectively complete the conversion of an ARINC429 protocol into a serial peripheral equipment interface (SPI) protocol format and the conversion of an RS422 protocol into a serial data bus URAT protocol;
the digital processing unit (23) comprises:
the analog-to-digital conversion AD processing module (231) is used for carrying out AD sampling processing on the analog signals regulated by the analog regulating circuit (211);
the SPI processing module (232) is used for analyzing the state information of the Doppler radar of the data output by the ARINC429 protocol conversion circuit (221) and generating an image frame;
the display data processing module (233) is used for converting the image frame data generated by the SPI processing module (232) into RGB565 standard protocol data and sending the data to the data storage module (234);
the data storage module (234) is used for temporarily storing the data sent by the display data processing module (233) and sending the data to the display component (3) at regular time;
the UART processing module (235) is used for analyzing data sent by the RS422 protocol conversion circuit (222), realizing on-line upgrading of software, and realizing the functions of brightness adjustment and day-night switching of a display screen by cross-linking the universal asynchronous receiving-transmitting transmitter UART and the display component (3);
and the interrupt processing module (236) is used for judging the Doppler radar speed state discrete quantity sent by the discrete quantity regulating circuit (212) and sending the processed discrete quantity to the display component (3) for displaying.
2. The airborne hover indicator of claim 1, characterized by a power circuit board (1) comprising a filtering surge suppression unit (11), a power protection unit (12) and a direct current power conversion DC-DC unit (13): the filtering surge suppression unit (11) performs anti-reversion and filtering surge treatment on the direct-current voltage input by the aircraft and then respectively outputs the direct-current voltage to the power supply protection unit (12) and the display assembly (3); the power supply protection unit (12) controls the impulse current and stores the energy of the direct current voltage input by the filtering surge suppression unit (11), and then outputs the direct current voltage to the direct current voltage conversion unit (13); the direct-current voltage conversion unit (13) converts a +28V direct-current power supply input by the power supply protection unit (12) into a +/-12V DC working power supply and a +12V DC working backlight power supply, and outputs the +/-12V DC working power supply and the +12V DC working backlight power supply to the processor circuit board (2) and the display component (3) respectively.
3. The airborne hover indicator of claim 1, wherein the voltage adjusting unit (21) is composed of an analog adjusting circuit (211) and a discrete quantity adjusting circuit (212), the analog adjusting circuit (211) adjusts the analog voltage input by the doppler radar and outputs the adjusted voltage to an analog-to-digital (AD) processing module (231), and the discrete quantity adjusting circuit (212) adjusts the discrete voltage input by the doppler radar and outputs the adjusted voltage to an interrupt processing module (236).
4. The airborne hover indicator of claim 1, wherein the digital protocol conversion unit (22) comprises an ARINC429 protocol conversion circuit (221) and an RS422 protocol conversion circuit (222), the ARINC429 protocol conversion circuit (221) is formed by an ARINC429 protocol module, and is configured to convert an ARINC429 protocol inputted by the doppler radar into an SPI protocol, and output the SPI protocol to the SPI processing module (232); the RS422 protocol conversion circuit (222) is composed of an RS422 protocol module and is used for converting an RS422 protocol input by a personal computer PC into a UART protocol and outputting the UART protocol to a UART processing module (235).
5. The airborne hover indicator of claim 1, wherein the UART processing module (235) parses the data sent by the RS422 protocol conversion circuit (222), and performs a software handshake with the signal input by the RS422 protocol conversion circuit (222), if the handshake succeeds, then performs data download and data verification, and outputs the data without error to the memory of the digital processing unit (23) to complete software upgrade, otherwise, performs the handshake again.
6. The airborne hover indicator of claim 1, characterized in that the SPI processing module (232) performs state information analysis of the doppler radar on the ARINC429 protocol conversion circuit (221) output data by extracting required information through analyzing labels and deciding fault information of the doppler radar: and if the radar has no fault, extracting the speed information of the carrier, filtering, and finally generating a pointer position image frame, and if the radar has a fault, directly generating a state image frame.
7. The airborne hover indicator of claim 1, characterized in that the secondary power conversion unit (24) is composed of a DC-DC module, and is used to convert +12V power inputted by the power circuit board (1) into +3.3V power, and output the +3V power to the digital protocol conversion unit (22) and the digital processing unit (23).
8. The airborne hover indicator of claim 1, characterized by a data storage module (234) that temporarily stores data entered by the display data processing module (233) as follows:
firstly, creating two linked lists, wherein one linked list is used as an idle memory indication linked list and is used for inserting the initial address and size data of an available memory space; the other one is used as an allocated memory indication linked list and is used for inserting the initial address and the size data of the occupied memory space;
when the program applies for the memory space, the required size data is transmitted in, and the system searches the minimum RAM space meeting the requirements in the idle linked list. If the space is larger than the required size, the RAM space is split from the head of the space according to the data blocks with fixed sizes until the space size applied by the program is met, and then the split RAM space is linked into an allocated memory linked list;
when the memory is released, the program transmits a pointer of the released memory block, retrieves pointer data block information in the distributed linked list, then takes out the memory data in the memory block, adds the released linked list information into an idle memory indication linked list, and the idle memory indication linked list judges whether an unallocated area continuous with the memory block exists according to the information of the added linked list, if so, the unallocated area is merged, and if not, the unallocated area is added to a corresponding position according to the size sequence of the starting address.
9. The system of claim 1, wherein: the display component (3) is composed of a backlight driving unit (31), an LCD unit (32) and a light guide plate unit (33), wherein the backlight driving unit (31) is respectively connected with the LCD unit (32) in a bidirectional way and is connected with the light guide plate unit (33) in a unidirectional way, and is used for providing power supply, displaying data and controlling a screen preheating mode for the LCD unit (32) and collecting key information on the light guide plate unit (33); the LCD unit (32) carries out terminal display on display data input by the backlight driving unit (31), collects temperature information on a screen in real time through a temperature sensor and outputs the temperature information to the backlight driving unit (31).
Priority Applications (1)
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