CN113359124B - Airborne hover indicator - Google Patents
Airborne hover indicator Download PDFInfo
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- CN113359124B CN113359124B CN202110551949.0A CN202110551949A CN113359124B CN 113359124 B CN113359124 B CN 113359124B CN 202110551949 A CN202110551949 A CN 202110551949A CN 113359124 B CN113359124 B CN 113359124B
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- 238000012545 processing Methods 0.000 claims abstract description 65
- 238000006243 chemical reaction Methods 0.000 claims abstract description 64
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- 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
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000004146 energy storage Methods 0.000 claims description 3
- 238000004132 cross linking Methods 0.000 claims description 2
- 239000000284 extract Substances 0.000 claims description 2
- 238000013524 data verification Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 9
- 230000004297 night vision Effects 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
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Classifications
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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 hover indicator, which mainly solves the problems of low speed indication precision and poor environmental adaptability of an airborne 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 comprises: a power circuit board, a processor circuit board, and a display assembly. The power circuit board carries out EMI filtering surge and numerical conversion treatment 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 a signal input by the radar on the carrier, analyzes the speed of the carrier, processes the speed and outputs the speed to the display component for display. According to the invention, the triaxial speed and radar state information of the carrier measured by the Doppler radar are received, and the triaxial small speed of the carrier in a hovering state is indicated in real time in a pointer mode after the processing, so that the indication precision is improved, the requirements of electromagnetic compatibility and night vision green are met, and the method 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
The airborne hover indicator is instrument equipment for hover speed indication by receiving triaxial speed data provided by a multi-purpose radar, and is provided with a digital display interface, so that the carrier speeds in the vertical direction, the forward direction and the lateral direction can be visually displayed. Meanwhile, the system has night vision compatibility, fault detection and firmware upgrading functions in running.
Currently, the hover indication device is mostly a mechanical pointer type or an analog type, wherein:
the mechanical pointer type mechanical type adopts an electromagnetic moving coil type pointer structural design, and the pointer is driven to deflect by a coil so as to show the current speed value and the searching and locking state of the radar. Such pointer type structures are subject to great environmental impact, complex structures, difficult to maintain, and severely ill-suited to relatively complex environmental requirements in terms of packaging, shipping, and storage conditions.
The analog type is to amplify the input DC small-speed signal and drive the LED to emit light by the comparison circuit or to adjust the analog signal and then to perform AD sampling, filtering, unit conversion and other processes for display. The simulation is unfavorable for the pilot to judge the current hovering state of the carrier due to larger structural error; meanwhile, due to poor electromagnetic compatibility, the method is difficult to adapt to relatively complex environmental requirements; in addition, the fault state prompt of the system equipment and the online upgrade of the software of the equipment cannot be carried out, so that the maintenance of the system and the equipment is not facilitated.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the airborne hover indicator with a novel structure, so as to improve the indication resolution, prompt equipment faults in time, improve the maintainability of the system, meet the relatively complex environmental requirements of electromagnetic compatibility and night vision, and help a pilot to accurately judge the hover state.
In order to achieve the above object, the airborne hover indicator of the present invention comprises a power circuit board, a processor circuit board and a display assembly, wherein the input end of the processor circuit board is connected with a Doppler radar on a carrier, and the output is connected with the display assembly, and the airborne hover 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 conversion unit;
the voltage adjustment unit includes: an analog adjusting circuit, a discrete amount adjusting circuit;
the digital protocol conversion unit includes: an aviation bus standard ARINC429 protocol conversion circuit and a balance voltage digital interface RS422 protocol conversion circuit respectively finish converting ARINC429 protocol into serial peripheral interface SPI protocol format and converting RS422 protocol into 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 signals regulated by the analog regulating circuit;
the SPI processing module is used for analyzing the state information of the Doppler radar for the data output by the ARINC429 protocol conversion circuit and generating 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 transmitting the RGB565 standard protocol 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 the data sent by the RS422 protocol conversion circuit, realizing online upgrading of software, and realizing brightness adjustment and day-night switching functions of a display screen through cross linking of a universal asynchronous receiving and 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 adjusting circuit, and sending the processed Doppler radar speed state discrete quantity to the display component for display;
the secondary power conversion unit consists of a DC-DC module and is used for converting +12V power input by the power circuit board into +3.3V power and outputting the +12V power 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-reflection circuit and a filtering surge circuit, wherein the direct-current voltage output by the anti-reflection circuit is respectively output to the power protection unit and the display component after electromagnetic compatibility filtering and power 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-down protection circuit, wherein 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 by the power-down protection circuit;
the direct-current voltage conversion unit consists 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 the +28V direct-current power supply and the +12V DC working backlight power supply are respectively output to the processor circuit board and the display assembly.
The voltage adjusting unit is further composed of an analog adjusting circuit and a discrete quantity adjusting circuit, the analog adjusting circuit adjusts the analog voltage input by the Doppler radar, the analog voltage is output to the analog-to-digital conversion AD processing module, and the discrete quantity adjusting circuit adjusts the discrete voltage input by the Doppler radar and then outputs the discrete 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 the RS422 protocol input by the personal computer PC into the UART protocol and outputting the UART protocol to the UART processing module.
Further, 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 two-way and the light guide plate unit in a one-way, and is used for providing 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 performs terminal display on display data input by the backlight driving unit, acquires temperature information on a screen in real time through a temperature sensor, and outputs the temperature information to the backlight driving plate.
Compared with the prior art, the invention has the following advantages:
1. high indication resolution
The invention enhances the anti-interference capability of signals, reduces speed measurement errors and improves speed measurement resolution by adopting a digital input mode; meanwhile, the resolution is increased 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 the image frame by analyzing the state information transmitted by the Doppler radar, and can locate the unit module generating the fault by utilizing the fault code displayed by the image frame; meanwhile, as the digital interface RS422 protocol conversion circuit is added, the on-line upgrading is completed in a handshake interruption mode, and the maintainability of the radar and the airborne hover indicator is improved.
3. High environmental adaptability
The filter surge suppression unit and the power supply protection unit are additionally arranged, so that the electromagnetic compatibility can be improved, and the requirement of the carrier electromagnetic compatibility is met; meanwhile, as the display component with night vision compatible function is selected, the night vision green requirement of the carrier 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 a power circuit board structure in accordance with the present invention;
FIG. 3 is a block diagram of a circuit board structure of a process board according to the present invention;
fig. 4 is a block diagram showing the structure of the display assembly in 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 circuit board 1, a processor circuit board 2, and a display assembly 3; the power circuit board 1 is respectively connected with the processor circuit board 2 and the display component 3 in a unidirectional manner, and the two unidirectional connection functions are realized, namely, the bidirectional connection function is used for converting an externally input +28V power supply into a +/-12V direct current working power supply and a +12V direct current working backlight power supply, respectively supplying power for the processor circuit board 2 and the display component 3, and the bidirectional connection function is used for signal switching, so that the external input analog triaxial speed and discrete quantity effective flag signal, ARINC429 digital triaxial speed signal and RS422 program online upgrade signal are directly output to the processor circuit board 2 through connectors on the power circuit board 1 without any processing;
the processor circuit board 2 is connected with the display assembly 3 through two paths, wherein one path is in unidirectional connection and is used for carrying out voltage regulation on input analog signals and discrete quantity signals, carrying out protocol conversion on ARINC429 protocol and RS422 protocol, carrying out data extraction and processing on signals subjected to voltage regulation and protocol conversion, and transmitting image frames to the display assembly 3 through an RGB565 interface; the other path is connected in a two-way manner, 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 a display screen, outputting the key information to the processor circuit board 2, and completing the brightness control and day and night switching functions according to the instructions input by the processor circuit board 2.
Referring to fig. 2, the power circuit board 1 includes a filter surge suppressing unit 11, a power protection unit 12, and a dc voltage converting unit 13; wherein the method comprises the steps of
The filtering surge suppression unit 11 comprises an anti-reflection circuit 111 and a filtering surge circuit 112, wherein the anti-reflection circuit 111 is designed in a diode mode and is used for carrying out anti-connection and anti-reflection design on externally input power signals so as to prevent equipment from being damaged when the positive electrode and the negative electrode of the power supply are reversely connected, and the output of the anti-reflection circuit 111 is sent to the filtering surge circuit 112; the filtering and 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 the power signal input by the anti-reflection circuit 111, so that the equipment meets the electromagnetic compatibility requirement of the carrier, and the output of the equipment is respectively sent to the power protection unit 12 and the display component 3;
the power protection unit 12 includes a surge current control circuit 121 and a power-down protection circuit 122, where the surge current control circuit 121 is composed of a resistor and a diode circuit, and is used to limit the surge current generated at the moment of powering on the device, protect the safety of the whole machine, and output the surge current to the power-down 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 supply input by the impact current control circuit 121, so as to prevent data loss in the data processing unit 23 when the power supply 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 used for converting the voltage of the power supply input by the power supply protection unit 12 and supplying power to the processor circuit board 2 and the display component 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 method comprises the steps of
The voltage adjusting unit 21 comprises an analog adjusting circuit 211 and a triode adjusting circuit 212, wherein the analog adjusting circuit 211 is composed of an operational amplifier, a voltage reference chip and a peripheral circuit, and is used for adjusting a-5V to +5V analog voltage module sent by the Doppler radar, converting the voltage into 0V to +3V and then outputting the voltage to the AD processing module 231; the triode adjusting circuit 212 is composed of a triode and a peripheral resistor, and is used for adjusting the voltage of a 0V/+5V discrete quantity signal sent by the Doppler radar, converting the signal into 0V/+3V and then outputting the signal to the interrupt processing module;
the digital protocol conversion unit 22 includes an ARINC429 protocol conversion circuit 221 and an RS422 protocol conversion circuit 222, where the ARINC429 protocol conversion circuit 221 is composed of an ARINC429 protocol conversion chip and a peripheral circuit, and is configured to convert ARINC429 input by the doppler radar into an SPI protocol that can be parsed by the digital processing unit 23, and compared with the conventional manner of converting into GPIO, the SPI has the advantages of less occupied IO resources and high transmission efficiency, and after the protocol conversion is completed, the output is sent to the SPI processing module 232; 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 the PC into a UART protocol that can be parsed 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, namely:
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, perform AD conversion mode selection, configure a sampling rate, and AD calibration through a configuration register, and complete analog-to-digital conversion;
the SPI processing module 232 is configured to analyze status information of the doppler radar for data output by the ARINC429 protocol conversion circuit 221, generate an image frame, that is, firstly, when power is on, send an instruction to the ARINC429 protocol conversion circuit 221 to complete circuit self-checking, ensure that the circuit can work normally, then analyze status information input by the doppler radar, directly generate the status image frame if the circuit fails or the radar fails, and extract forward, lateral and vertical speed information of the carrier and perform filtering processing to generate a pointer position image frame if the radar does not fail. The two image frames are generated as follows:
the generation of the status image frames is: the fault tree image frame is initialized to be a mangrove root node, and default sub-image nodes are added to the tree according to the display content requirement, and 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 hover indicator is received, the fault information is converted into sub-image frame information, and the sub-image frame is initialized to be a red-black tree node and contains related sub-image name, RAM initial address, row length, column length, row space offset and other information. And after the initialization is finished, adding the newly input sub-image frame node into a red-black tree of the radar or hover indicator fault image frame, and repositioning the red-black tree of the fault image frame to a node position with the same name as the sub-image by the red-black tree of the fault image frame and replacing the node position.
The generation of the pointer position image frame is as follows: the pointer image frame is initialized to a red-black tree first, except that the default sub-image node is added according to the pointer display requirement. And then converting the extracted and processed carrier speed information pointer into a red-black tree node representing the sub-image, adding the red-black tree node into the red-black tree of the pointer image frame, and finally searching the red-black tree for the node with the same name as the sub-image and replacing the node.
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 clock, a priority, and a cyclic mode of a direct memory storage DMA, where the DMA has the advantages of efficient data transfer between registers and no need of occupying 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 is:
firstly, two linked lists are generated, 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 is used as an allocated memory indication chain table for inserting the initial address and size data of the occupied memory space;
secondly, performing memory application, namely, transmitting size data required by a program, and searching the minimum RAM block meeting the requirement in the idle indication linked list by the system: if the space is larger than the required size, splitting the RAM space from the head according to the fixed size, and distributing according to the requirement after splitting is completed;
then, memory release is carried out, namely, a program is transmitted into pointers of memory blocks to release, data block information aligned with the pointers is searched in an allocated linked list, the memory data of the block is taken out from the allocated linked list, the pointers are added into an idle memory indication linked list, and the idle memory indication linked list judges whether a space region continuous with the memory blocks exists or not according to the added information: if so, merging the two, and if not, adding the two into 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 frequently applies for release, and improve the memory performance of the system;
the UART processing module 235 is used for online upgrade of a program and analysis of key instructions, wherein during software upgrade, a personal computer PC firstly sends an interrupt request through an RS422 protocol conversion circuit 222, then the processing module performs software handshake with the PC, if the handshake is successful, then performs data downloading and data inspection, and outputs the inspected data to a memory to complete the software upgrade, otherwise, performs handshake again; in the analysis of the key instruction, the corresponding instruction 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 quantity sent by the discrete quantity 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 works 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, wherein the backlight driving unit 31 is respectively connected with the LCD unit 32 in two directions, and is used for providing power to the LCD unit 32, outputting display data, collecting screen temperature on the LCD unit 32, and controlling a preheating mode of the screen; is connected with the light guide plate unit 33 in one way and is used for collecting key information on the light guide plate unit (33). When the device works, firstly, screen temperature data acquired by a temperature sensor is transmitted to the backlight driving unit 31 in real time by the LCD unit 32, the backlight driving unit 31 controls a preheating mode according to temperature information, if the temperature is lower than-25 ℃, the preheating mode is started by supplying power to conductive glass on the LCD unit 32, and if the temperature is higher than-20 ℃, the preheating mode is closed by power failure; then, the backlight driving unit 31 converts the RGB565 video 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 lights, and outputs the constant current signals to the LCD unit 32 for image display; if the screen brightness adjustment and the day-night switching are required, the light guide plate 33 outputs different key information to the backlight driving unit 31, the backlight driving unit 31 de-jitters the key information and converts the key information into UART protocol to be output to the UART processing module 235, and the adjustment of the screen brightness and the day-night switching function are completed according to the 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 through the digital input mode, the speed information of the carrier is extracted and processed, and finally the forward, lateral and vertical speeds of the carrier in a hovering state are indicated on the display component in real time in a pointer mode, and meanwhile, the instrument device has electromagnetic compatibility, night vision compatibility, fault detection and software online upgrading.
The above description is only one specific example of the invention and does not constitute any limitation of the invention, and it will be apparent to those skilled in the art that various modifications and changes in form and details may be made without departing from the principles, construction of the invention, but these modifications and changes based on the idea of the invention remain within the scope of the claims of the invention.
Claims (8)
1. The utility model provides an airborne indicator that hovers, includes power 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 with display module (3), its characterized in that: 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 amount adjustment circuit (212);
the digital protocol conversion unit (22) includes: an aviation bus standard ARINC429 protocol conversion circuit (221) and a balance voltage digital interface RS422 protocol conversion circuit (222) respectively finish converting the ARINC429 protocol into a serial peripheral interface SPI protocol format and converting the 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 for the data output by the ARINC429 protocol conversion circuit (221) to generate an image frame;
a display data processing module (233) for converting the image frame data generated by the SPI processing module (232) into RGB565 standard protocol data, and sending the RGB565 standard protocol data to a data storage module (234);
a data storage module (234) for temporarily storing the data sent from the display data processing module (233) and sending the data to the display module (3) at regular time;
the data storage module (234) temporarily stores the data sent by the display data processing module (233), and the implementation is 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 starting address and size data of an available memory space; the other is used as an allocated memory indication chain table for inserting the initial address and size data of the occupied memory space;
when a program applies for a memory space, the needed size data is transmitted, and the system searches the minimum RAM space meeting the requirement in the idle linked list; if the space is larger than the required size, splitting the RAM space from the space head according to the data block with the fixed size until the space size of the program application is met, and then linking the split RAM space into an allocated memory linked list;
when the memory is released, the program transmits pointers of released memory blocks, retrieves pointer data block information in an allocated linked list, then takes out the block memory data, adds the released linked list information into an idle memory indication linked list, judges whether unallocated areas continuous with the memory blocks exist or not according to the information of the added linked list, if yes, merges the unallocated areas, and if not, adds the unallocated areas into corresponding positions according to the size sequence of a starting address;
the UART processing module (235) is used for analyzing the data sent by the RS422 protocol conversion circuit (222) to realize online upgrade of software, and realizing brightness adjustment and day-night switching functions of a display screen through cross-linking of a universal asynchronous receiving and transmitting device UART and a display assembly (3);
and the interrupt processing module (236) is used for judging the Doppler radar speed state discrete quantity sent by the discrete quantity adjusting circuit (212), and sending the Doppler radar speed state discrete quantity to the display assembly (3) for display after processing.
2. The onboard hover indicator according to 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-reflection and filtering surge treatment on the direct-current voltage input by the carrier and outputs the direct-current voltage to the power supply protection unit (12) and the display assembly (3) respectively; the power supply protection unit (12) performs impulse current control and energy storage on the direct-current voltage input by the filtering surge suppression unit (11) and outputs the direct-current voltage to the direct-current voltage conversion unit (13); the direct-current voltage conversion unit (13) converts the +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 the operating backlight power supplies are respectively output to the processor circuit board (2) and the display component (3).
3. The airborne hover indicator according to claim 1, wherein the voltage adjustment unit (21) is composed of an analog adjustment circuit (211) and a discrete amount adjustment circuit (212), the analog adjustment circuit (211) adjusts an analog voltage input by the doppler radar and outputs the adjusted analog voltage to the analog-to-digital conversion AD processing module (231), and the discrete amount adjustment circuit (212) adjusts a discrete voltage input by the doppler radar and outputs the adjusted discrete voltage to the interrupt processing module (236).
4. The airborne hover indicator according to 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) being formed by an ARINC429 protocol module, and being configured to convert an ARINC429 protocol input 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 formed by an RS422 protocol module, and is configured to convert the RS422 protocol input by the PC into a UART protocol, and output the UART protocol to the UART processing module (235).
5. The airborne hover indicator according to claim 1, wherein the UART processing module (235) parses the data sent by the RS422 protocol conversion circuit (222) by performing a software handshake with a signal input by the RS422 protocol conversion circuit (222), if the handshake is successful, then performing data download and data verification, and outputting the verified error-free data to a memory on the digital processing unit (23) to complete the software upgrade, otherwise, re-performing the handshake.
6. The airborne hover indicator according to claim 1, wherein the SPI processing module (232) performs doppler radar status information analysis on the data output by the ARINC429 protocol conversion circuit (221), extracts required information by analyzing labels, and determines fault information of the doppler radar: and if the radar has no fault, extracting speed information of the carrier, filtering, and finally generating a pointer position image frame, and if the radar has fault, directly generating a state image frame.
7. The onboard hover indicator according to claim 1, characterized in that the secondary power conversion unit (24) consists of a DC-DC module, and is configured to convert +12v power input from the power circuit board (1) to +3.3v and output the converted +1v to the digital protocol conversion unit (22) and the digital processing unit (23).
8. The on-board hover indicator according to claim 1, characterized by: the display assembly (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 two-way manner and is connected with the light guide plate unit (33) in a one-way manner, and is used for providing power supply, display data and control screen preheating modes for the LCD unit (32) and collecting key information on the light guide plate unit (33); the LCD unit (32) displays the display data input by the backlight driving unit (31) in a terminal mode, acquires temperature information on a screen in real time through a temperature sensor, and outputs the temperature information to the backlight driving unit (31).
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