CN102044171B - Device and method for screen tracking display of flight information - Google Patents
Device and method for screen tracking display of flight information Download PDFInfo
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Abstract
The invention discloses a device and method for the screen tracking display of flight information, belonging to the field of aircraft monitoring. The device comprises a decoding module, a coordinate conversion module, a storage module, a display module, a search module and a view port coordinate system setup module which are sequentially connected with each other, wherein the decoding module is also connected with the storage module, the view port coordinate system module is connected with the display module, and the search module is connected with the storage module. By using the invention, all flight information of an aircraft can be subject to tracking display by simply clicking the corresponding aircraft icon on the screen with a mouse.
Description
Technical field
The present invention relates to a kind of flight information display device and method, especially a kind of flight information tracking screen display device and method.
Background technology
At present; Consistent automatic dependent surveillance-broadcasting the ADS-B that admits in air traffic field, the whole world is a kind of trend that surveillance technology develops; It can provide more accurate air traffic to keep watch on a kind of low investment and the low mode of safeguarding; Aircraft sends the 1090MHz ES signal that has relevant self-position and other flight parameters, is received by ADS-B land station and realizes effective air traffic control measurement.The outstanding advantage of ADS-B is both can in traditional primary radar, monopulse secondary radar and S pattern secondary radar zone, use, and also can in above-mentioned radar covers difficult spatial domain, use.
ADS-B is based on the data chainning communication technology, has three kinds of data link and supplies ADS-B users to select to be suitable for: 1090ES data chainning, general-purpose accessing transceiver (UAT) and the pattern 4 very high frequency(VHF) data chainnings (VDL-4) based on the 1090ES of alien frequencies radar receiver of S pattern.
The various information that aircraft sends aircraft with certain cycle comprise: aircraft identification information (ID), position, highly, speed, direction and the climb rate etc.Accomplish the basic function of this ADS-B equipment of ADS-B OUT.
ADS-B is not only applicable to the air route and advances traffic control in the near-space; Higher returns of investment and cheap operating cost are arranged; ADS-B land station and primary radar, monopulse secondary radar and S pattern secondary radar and other supervision means are used jointly, can fill up because radar shadow that the sighting distance effect produces and better low latitude covering.
ADS-B land station can be directly through IP network connection carrying out remote maintenance and mutual configuration-system; After system's setting finishes; ADS-B land station is the monitoring data of the exportable ASTERIX of meeting standard, and the simultaneity factor support is from the Long-distance Control of a plurality of ADS-B supervisory systems.
The ADS-B supervisory system is used for Centralized Monitoring, can show the empty feelings of one or more ADS-B land station receiver output in lines.The information of all receivers of supervisory system continuous acquisition is analyzed and is made an immediate response event.Supervisory system can be PC, workstation or the portable PC of maintenance etc.; Be connected with one or more ADS-B land station through IP network; Receive ASTERIX CAT 021 message that ADS-B land station sends; Through processing such as decoding operation, present to the user in real time with air traffic situation around the mode general of graph image, therefore possessed the function of Centralized Monitoring.The monitor staff can be according to ASTERIX 021 message of ADS-B land station transmission through existing ADS-B supervising device; Understand the flight information of aircraft through the aircraft label; But usually label generally only shows the more important information such as catchword, 24 bit address, barometer altitude and ground speed of aircraft, so as not to airbound target screen display is too chaotic more for a long time.Other relevant flight informations (such as information such as SAC, SIC, time degree of accuracy, steering rate, air speed and magnetic heading) can be presented at these information of each aircraft one side of screen usually with the form of tabulation; If the monitor staff need understand the aircraft more information; Then need in list box, search voluntarily; This display mode has not only taken the screen display space of ADS-B supervising device, and in search procedure, also can waste monitor staff's time.
Summary of the invention
The purpose of this invention is to provide a kind of based on pinpoint flight information tracking screen display packing; All flight informations of tracking aircraft are presented on the screen it quickly and accurately; Further improved monitoring capacity; And the same time only shows the details of an aircraft, has avoided the chaotic problem of screen display.
The technical scheme that the present invention adopts is following: this flight information tracking screen display device comprises decoder module, coordinate transferring, memory module, viewport coordinate system and sets up module, searches module and display module; Wherein decoder module is connected with coordinate transferring, memory module; Coordinate transferring is connected with memory module; Memory module with display module, search module and be connected, the viewport coordinate system is set up module and is connected with display module;
The method of utilizing said apparatus to realize that the flight information tracking screen shows specifically comprises following steps:
A, set up module through the viewport coordinate system and on the basis of window coordinates systems, set up the viewport coordinate system: the viewport coordinate system is set up module when said apparatus starts; The big or small M_XRECT of record window coordinate system; M_YRECT, this moment, the horizontal ordinate of viewport coordinate system was LEFTX=M_XRECT/2, RIGHTX=M_XRECT/2; BOTTOMY=M_YRECT/2, TOPY=M_YRECT/2;
B, ASTERIX 021 message is sent to decoder module obtains aircraft with decoding flight information; Decoder module sends to memory module with flight information and stores with the form of structure formation; And the latitude and longitude information in the flight information is sent to coordinate transferring to obtain and the corresponding viewport coordinate of latitude and longitude information; Again the viewport coordinate is sent to the memory module storage, wherein the address of the address of each structure and an aircraft is complementary;
C, the viewport coordinate system shown through display module after, memory module sends to display module with the viewport coordinate, is plotted in the said viewport coordinate system through display module, wherein each viewport coordinate is all corresponding with an aircraft icon;
D, click aircraft icon send one and search signal and give and to be searched module, and searching module is the center of circle with the drop point of mouse, and preset value FIND_RANGE is that radius is drawn circle, searches the aircraft in said circle, specifically carries out following steps:
Write down the coordinate that falls of mouse;
From memory module, call each viewport coordinate; Cycle calculations viewport coordinate and the distance that falls coordinate; If distance is less than radius FIND_RANGE; Search that module sends that a definite signal is given memory module so that memory module will be corresponding with the viewport coordinate the said flight information of aircraft send to display module, be presented on the screen through display module, and withdraw from cycle calculations.
In addition, by the translation of mouse drag viewport coordinate system the time, the viewport coordinate system is set up module and is carried out following steps in step a, and wherein said mouse comprises that mouse falls, mouse moves and mouse discharges three actions:
When mouse falls, and the horizontal ordinate of record drop point (M_XM, X_YM);
When mouse moves, calculate the displacement DELTAX=POINT.X-M_XM of the horizontal ordinate of viewport coordinate system, DELTAY=POINT.Y-M_YM, wherein (POINT.X POINT.Y) is mouse said mouse horizontal ordinate in window coordinates system when moving;
Calculate the horizontal ordinate of translation backsight mouth coordinate system: LEFTX=LEFTX+DELTAX; RIGHTX=RIGHTX – DELTAX, BOTTOMY=BOTTOMY – DELTAY, TOPY=TOPY+DELTAY; And mouse is moved the horizontal ordinate (POINT.X of back mouse; (M_XM X_YM) makes M_XM=POINT.X, X_YM=POINT.Y to the horizontal ordinate of drop point when POINT.Y) assignment falls to mouse;
Again the DYSK coordinate system discharges mouse.
Moreover the maintenance of structure comprises when memory module receives the new construction body through decoding in the memory module in step b, searches the structure that whether exists the address with the new construction body to be complementary in the structure formation in memory module:
If there is the structure that is complementary with new construction body address, then give said structure with new construction body assignment;
If there is not the structure that is complementary with new construction body address, then the new construction body is added into said structure formation.
And the structure in step b in the memory module has life cycle, when structure did not upgrade in life cycle, then structure is deleted from the structure formation.
In sum, owing to adopted technique scheme, the invention has the beneficial effects as follows:
1. existing aircraft flight method for information display based on the ADS-B technology; The part important information that only on screen, shows aircraft; Then need carry out other operations if check other information of aircraft, and this method is clicked all flight informations that the aircraft icon just can demonstrate aircraft real-time through mouse on screen;
2. this method is through searching module, and the same time (promptly clicking mouse one time) only shows the flight information of an aircraft, has avoided the chaotic problem of screen display.
Description of drawings
The present invention will explain through example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is that the inner structure of this flight information tracking screen display device connects synoptic diagram;
Fig. 2 is the synoptic diagram of window coordinates system and viewport coordinate system;
Fig. 3 is the synoptic diagram after the translation of viewport coordinate system;
Fig. 4 is the process flow diagram that the viewport coordinate system defines again;
Fig. 5 is the process flow diagram that the structure formation is safeguarded;
Fig. 6 is the process flow diagram that the flight information tracking screen of aircraft shows.
Mark among the figure: 1 is latitude and longitude information, and 2 is flight information, and 3 is the viewport coordinate of aircraft, and 4 for searching signal and 5 for confirmation signal.
Embodiment
Disclosed all characteristics in this instructions, or the step in disclosed all methods or the process except mutually exclusive characteristic and/or the step, all can make up by any way.
Disclosed arbitrary characteristic in this instructions (comprising any accessory claim, summary and accompanying drawing) is only if special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, only if special narration, each characteristic is an example in a series of equivalences or the similar characteristics.
At present, the consistent automatic dependent surveillance-broadcasting ADS-B that admits in global air traffic field is a kind of trend that surveillance technology develops, and it can provide more accurate air traffic to keep watch on a kind of low investment and the low mode of safeguarding.The advantage of ADS-B surveillance technology is both can in traditional primary radar, monopulse secondary radar and S pattern secondary radar zone, use, and also can in above-mentioned radar covers difficult spatial domain, use.
Aspect the flight information demonstration of aircraft; Screen display is too chaotic more for a long time for fear of airbound target for traditional ADS-B supervising device; The important flight information that only shows aircraft through the label of aircraft; Information such as catchword, 24 bit address, barometer altitude and ground speed such as aircraft; Other then are presented on the screen of ADS-B supervising device with the form of list box such as information such as SAC, SIC, time degree of accuracy, steering rate, air speed and magnetic heading usually; Because these information of each aircraft are all listed in list box, so this display mode has not only occupied the display screen space of ADS-B supervising device, and the monitor staff can spend the more time when searching these flight informations of different aircraft.With respect to traditional ADS-B supervising device, this method can be utilized the detailed flight information of mouse quick tracking aircraft on screen, thereby accomplishes the reliable supervision to the aircraft details.
Like Fig. 1; Should comprise decoder module, coordinate transferring, memory module, viewport coordinate system based on flight information tracking screen display device of ADS-B monitoring technique sets up module, display module and searches module; Wherein decoder module is connected with coordinate transferring, memory module; Coordinate transferring is connected with memory module, and memory module, viewport coordinate system are set up module and be connected with display module, and searches module and be connected with memory module.
In the actual monitored process; The 1090MHz ES signal that aircraft will have relevant self-position and other flight parameters sends to ADS-B land station, and ADS-B land station can directly send to this flight information tracking screen display device through IP network with ASTERIX 021 message.Put it briefly, as shown in Figure 1, this flight information tracking screen display packing comprises two steps: the first step, and the drafting of aircraft icon, ADS-B land station sends to the decoder module decoding with ASTERIX 021 message, obtains the flight information 2 of aircraft; Decoder module all sends to the memory module storage with flight information 2; And the latitude and longitude information in the flight information 1 is sent to coordinate transferring to convert the viewport coordinate 3 that can in the viewport coordinate system, show to, and coordinate transferring will send to the memory module storage with the corresponding viewport coordinate 3 of the latitude and longitude information of each aircraft; The viewport coordinate system of setting up module foundation through the viewport coordinate system at first is presented on the display screen of this device by display module, these viewport coordinates is accessed to be plotted in the viewport coordinate system to obtain the aircraft icon of each aircraft again from memory module.In second step, the tracking screen of flight information shows, the aircraft icon that click obtains in the first step; Search signal 4 to searching one of module; Searching module is being the center of circle with the mouse drop point, and preset value FIND_RANGE is that radius is drawn circle, searches the aircraft in this circle; If find qualified aircraft then show the flight information of this aircraft and stop to search, if do not exist then do not show.
Describe the step of this flight information tracking screen display packing below in detail.
(1) drafting of aircraft icon
On the screen of flight information tracking screen display device, draw out the aircraft icon; Comprise three aspects; First sets up the viewport coordinate system; Second latitude and longitude information with each aircraft converts the viewport coordinate to, and the 3rd will be plotted in the viewport coordinate system with the corresponding viewport coordinate of each aircraft, thereby on screen, draw out each aircraft icon.
(1) sets up module through the viewport coordinate system and set up the viewport coordinate system
The initial point (0,0) of window coordinates system is positioned at the upper left corner of window, is that unit representes with the pixel, and the X axis right side is a positive dirction, and Y is axially down for forward and reverse, shown in left figure among Fig. 2.Viewport is meant the view client region of on screen, seeing, it is initial point with the window center, shown in Fig. 2 right-of-center in political views figure.In monitor procedure; The monitor staff may carry out operations such as convergent-divergent and translation to view; This moment, the viewport coordinate system also can carry out corresponding convergent-divergent translation variation, and the variation of correct calculation viewport coordinate system is that aircraft flight information is carried out the prerequisite that accurate tracking screen shows.
After the ADS-B supervising device started, the viewport coordinate system was set up the size of module records current window: M_XRECT, M_YRECT.The operation that view is carried out comprises two kinds of operations: convergent-divergent and translation.
When operating personnel did not carry out translation to view, the horizontal ordinate of viewport coordinate system was:
LEFTX=M_XRECT/2；
RIGHTX=M_XRECT/2；
BOTTOMY=M_YRECT/2；
TOPY=?M_YRECT?/2。
When operating personnel carried out translation to view, translation also took place in the viewport coordinate origin, and the variation of correct calculation viewport coordinate system could guarantee the correct flight information that shows required aircraft.For the translation of view, mouse has three actions: mouse falls, mouse moves and mouse discharges, and the viewport coordinate system is set up module and utilized the mouse information function to calculate the variation of viewport coordinate system.As shown in Figure 4, when mouse falls, set up the horizontal ordinate M_XM and the X_YM of module records drop point by the viewport coordinate system; When mouse moves, set up the displacement that module is calculated the horizontal ordinate of viewport by the viewport coordinate system:
DELTAX=?POINT.X－M_XM；
DELTAY=?POINT.Y－M_YM；
POINT.X, POINT.Y are the horizontal ordinate of mouse in window coordinates system in the mouse moving process, can obtain through the mouse information function.Having calculated also needs that mouse is moved the up-to-date mouse drop point in back after the displacement and composes the POINT.X to global variable M_XM=, M_YM=POINT.Y; Calculate the horizontal ordinate behind the viewport coordinate system transformation, DYSK coordinate system again then, as shown in Figure 3:
LEFTX?=?LEFTX?+?DELTAX；
RIGHTX?=?RIGHTX?-?DELTAX；
BOTTOMY?=?BOTTOMY?-?DELTAY；
TOPY?=?TOPY?+?DELTAY。Mouse discharges the translation of accomplishing view.
When operating personnel carry out zoom operations to view, then only need after converting window coordinates system to the viewport coordinate system, multiply by zoom factor and get final product.
(2) convert the latitude and longitude information of each aircraft to the viewport coordinate through coordinate transferring
After flight information tracking screen display device receives ASTERIX 021 message from ADS-B land station; ASTERIX 021 message is sent to decoder module; Obtain the flight informations such as longitude and latitude of aircraft; Decoder module sends to coordinate transferring with latitude and longitude information; Convert thereof into viewport coordinate SCREENX and SCREENY, simultaneously the flight information (comprising latitude and longitude information and 24 bit address) of each aircraft is sent to memory module and stores, and the coordinate transferring viewport coordinate that each aircraft is corresponding also sends in the memory module with the form of structure (corresponding) formation with flight information.In other words, all flight information (comprise latitude and longitude information) and the viewport coordinates corresponding have been comprised in the memory module with each aircraft.Generally, adopt 24 bit address that different aircraft is distinguished, the address of the address of each structure and corresponding aircraft is complementary in the memory module.
In the maintenance process of structure formation; As shown in Figure 5; When flight information tracking screen display device receives new ASTERIX 021 message, it is decoded and obtain corresponding flight information; In existing structure formation, search with this flight information in the structure that is complementary of 24 bit address, when finding the structure that address with it is complementary, structure (the being flight information) assignment that the decoding back is up-to-date is given this structure; Thereby arrive the purpose of flight information real-time update, wherein flight information is to upgrade by second; When not finding the structure that address with it is complementary, then this structure is added in the formation.
In addition, all there is a life cycle each aircraft inside, when the flight information of in this life cycle, not upgrading this aircraft (being structure) is then deleted this structure from this formation.
(3) the viewport coordinate system is presented on the display screen of ADS-B supervising device through display module, will be plotted in the viewport coordinate system with the corresponding viewport coordinate of each aircraft longitude and latitude again, thereby on display screen, demonstrates each aircraft icon.
(2) the flight information tracking screen shows
As shown in Figure 6; Use the aircraft icon on the click screen; This moment, mouse was searched signal 4 to searching one of module transmission, and searching module is the center of circle with the mouse drop point, and preset value FIND_RANGE (wherein the FIND_RANGE default setting is 5 pixels) is that radius is drawn circle; Search the aircraft in this circle, the flight information with this aircraft shows then.Concrete implementation procedure is: search module and send a signal to memory module and make each viewport coordinate (PLANE_X that memory module will be corresponding with each aircraft latitude and longitude information; PLANE_Y) send to and search module; Each viewport coordinate (PLANE_X of cycle calculations; PLANE_Y) the viewport coordinate corresponding with the mouse drop point (POINT.X, the distance B ISTANCE between POINT.Y):
TEMPX=PLANE_X?/ZOOM?-?(POINT.X?-LEFTX)；
TEMPY=PLANE_Y?/ZOOM?-?(TOPY-?POINT.Y)；
DISTANCE=SQRT(?((TEMPX?*?TEMPX))+(?TEMPY?*?TEMPY))；
If this distance B ISTANCE is less than FIND_RANGE (promptly in this circle scope); Then search module and send a confirmation signal 5 to memory module; Send all flight informations of this aircraft to display module by memory module; Thereby demonstrate the corresponding flight information of this aircraft, and jump out circulation:
if(DISTANCE?<?FIND_RANGE)
{
// serial interface display is handled function
Break;
}
In other words, when searching module searches, just no longer continue to search, only can show the flight information of an aircraft at one time through this method thus, thereby avoided the chaotic problem of screen display to a qualified aircraft.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (5)
1. flight information tracking screen display device; It is characterized in that; Comprising decoder module, coordinate transferring, memory module, viewport coordinate system sets up module, searches module and display module; Wherein said decoder module is connected with said coordinate transferring, said memory module, and said coordinate transferring is connected with said memory module, and said memory module is connected with said display module, the said module of searching; Said viewport coordinate system is set up module and is connected with said display module; Wherein said decoder module is used to receive the flight information that ASTERIX 021 message obtains aircraft, and flight information is all sent to the memory module storage, and the latitude and longitude information in the flight information is sent to coordinate transferring; Coordinate transferring is used for converting the latitude and longitude information of airplane information to can in moment coordinate system, show viewport coordinate, will send to the memory module storage with the corresponding viewport coordinate of the latitude and longitude information of each aircraft; It is by display module the viewport coordinate system to be presented on the display screen that the viewport coordinate system is set up module, the viewport coordinate is accessed to be plotted in the viewport coordinate system to obtain the aircraft icon of each aircraft again from memory module; Searching module and be used for receiving and search signal, is the center of circle with the mouse drop point again, and preset value FIND_RANGE is that radius is drawn circle, searches the aircraft in this circle.
2. one kind is utilized the described device of claim 1 to realize the method that the flight information tracking screen shows, it is characterized in that, comprises following steps:
A, set up module through the viewport coordinate system and setting up the viewport coordinate system on the basis of window coordinates systems: said viewport coordinate system is set up module when the described device of claim 1 starts; Write down the big or small M_XRECT that said window coordinates are; M_YRECT, this moment, the horizontal ordinate of said viewport coordinate system was LEFTX=M_XRECT/2, RIGHTX=M_XRECT/2; BOTTOMY=M_YRECT/2, TOPY=M_YRECT/2;
B, ASTERIX 021 message is sent to decoder module obtains aircraft with decoding flight information; Said decoder module sends to memory module with said flight information and stores with the form of structure formation; And the latitude and longitude information in the said flight information is sent to coordinate transferring to obtain and the corresponding viewport coordinate of said latitude and longitude information; Again said viewport coordinate is sent to said memory module storage, wherein the address of the address of each structure and an aircraft is complementary;
C, said viewport coordinate system shown through display module after; Said memory module sends to said display module with said viewport coordinate; Be plotted in the said viewport coordinate system through said display module, wherein each viewport coordinate is all corresponding with an aircraft icon;
D, the said aircraft icon of click send one and search signal and give and to search module, and the said module of searching is the center of circle with the drop point of said mouse, and preset value FIND_RANGE is that radius is drawn circle, searches the aircraft in said circle, specifically carries out following steps:
Write down the coordinate that falls of said mouse;
From said memory module, call each said viewport coordinate; Said viewport coordinate of cycle calculations and the said distance that falls coordinate; If said distance is less than said radius FIND_RANGE; Said search that module sends that a definite signal is given said memory module so that said memory module will be corresponding with said viewport coordinate the said flight information of aircraft send to said display module, be presented on the screen through said display module, and withdraw from cycle calculations.
3. flight information tracking screen display packing as claimed in claim 2; It is characterized in that; Among the step a by the translation of the said viewport coordinate system of said mouse drag the time; Said viewport coordinate system is set up module and is carried out following steps, and wherein said mouse comprises that mouse falls, mouse moves and mouse discharges three actions:
When said mouse falls, and the horizontal ordinate of record drop point (M_XM, X_YM);
When said mouse moves; Calculate the displacement DELTAX=POINT.X-M_XM of the horizontal ordinate of said viewport coordinate system; DELTAY=POINT.Y-M_YM, wherein (POINT.X POINT.Y) is said mouse said mouse horizontal ordinate in said window coordinates system when moving;
The horizontal ordinate of said viewport coordinate system: LEFTX=LEFTX+DELTAX after the calculating translation; RIGHTX=RIGHTX-DELTAX, BOTTOMY=BOTTOMY-DELTAY, TOPY=TOPY+DELTAY; And said mouse is moved the horizontal ordinate (POINT.X of the said mouse in back; (M_XM X_YM) makes M_XM=POINT.X, X_YM=POINT.Y to the horizontal ordinate of drop point when POINT.Y) assignment falls for said mouse;
Again define said viewport coordinate system, discharge mouse.
4. flight information tracking screen display packing as claimed in claim 2; It is characterized in that; The maintenance of structure described in the memory module described in the step b comprises when said memory module receives the new construction body through decoding, searches the structure that whether exists the address with said new construction body to be complementary in the said structure formation in said memory module:
If there is the structure that is complementary with said new construction body address, then give said structure with said new construction body assignment;
If do not have the structure that is complementary with said new construction body address, then said new construction body be added into said structure formation.
5. flight information tracking screen display packing as claimed in claim 2; It is characterized in that; Said structure described in the step b in the memory module has life cycle, when said structure did not upgrade in said life cycle, then said structure is deleted from said structure formation.
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| CN107578458A (en) * | 2017-09-14 | 2018-01-12 | 北京邮电大学 | A kind of method for drafting and device of aircraft running situation figure |
| CN110930769A (en) * | 2019-10-25 | 2020-03-27 | 中国民用航空中南地区空中交通管理局 | Automatic empty pipe alarming method and system and terminal equipment |
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| CN101183495A (en) * | 2007-12-20 | 2008-05-21 | 四川川大智胜软件股份有限公司 | Patternization based radar data analyzing method |
| WO2010019412A2 (en) * | 2008-08-15 | 2010-02-18 | Hewlett-Packard Development Company, L.P. | Apparatus, and associated method, for tracking aircraft status |
| CN101833104A (en) * | 2010-04-27 | 2010-09-15 | 北京航空航天大学 | Three-dimensional visual navigation method based on multi-sensor information fusion |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101183495A (en) * | 2007-12-20 | 2008-05-21 | 四川川大智胜软件股份有限公司 | Patternization based radar data analyzing method |
| WO2010019412A2 (en) * | 2008-08-15 | 2010-02-18 | Hewlett-Packard Development Company, L.P. | Apparatus, and associated method, for tracking aircraft status |
| CN101833104A (en) * | 2010-04-27 | 2010-09-15 | 北京航空航天大学 | Three-dimensional visual navigation method based on multi-sensor information fusion |
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