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1664 pj 1 
ÐÏࡱá>þÿ	^þÿÿÿþÿÿÿ]ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿì¥Á{`ø¿íbjbjîFîF	.NŒ,Œ,-2ÿÿÿÿÿÿ¤@@@@°°°Ä,,,8dŒð,Ää4¶(>TTT†'†'†'c4e4e4e4e4e4e4$š5h8”‰4°!)'@F'@!)!)‰4@@TT²	ž4222!)~@T°Tc42!)c422Hh°2T`²Jä{Ä,Ÿ-Â2c4´40ä42–8a0<–82–8°2\†'LÒ'62(,4(í†'†'†'‰4‰41j†'†'†'ä4!)!)!)!)ÄÄÄd(ÄÄÄ(ÄÄÄ@@@@@@ÿÿÿÿAir Traffic Controller(ATCSim)
Developed By :
1) Tushar Bansal
2) Chirag Patel
IMIT 2003-04
Real Time Operating System

	The actual real world Air Traffic Control is very complex and involves many more entities. But looking at the time constraint we have optimized our ATCSim project to be as close as that of real world. For controlling the air traffic the air space is subdivided into zones and each zone has an Air Traffic Controller which directs the Planes in order to let the air traffic flow smoothly.

Air Traffic Controller has the responsibility of checking for planes in its zone and redirecting them  to new paths if two or more of them have intercepting paths in its zone. We have divided our simulation area in 12 zones and each zone has an Air Traffic Controller(ATC). We have taken input from a file where the required structures are initialized. We have assigned the WCET of the tasks based on the JET control output.

TASK manager_ATC:	[SOFT TASK 		WCET = 700,		TIMEPERIOD = 80000]
The main reason behind creating this task is that it will activate and disable the corresponding recv_reg tasks based on whether a plane is flying in its zone. It keeps a check on the number of planes flying and for each flying plane it activates the corresponding recv_reg. Task in which the plane is flying. Once a plane leaves a zone, this task will disable the respective recv_reg. We have used CABS for reading the updated plane information which are written by the plane task.

TASK recv_reg:		[SOFT TASK		WCET = 150,		TIMEPERIOD = 40000]
The recv_reg task simulates the behavior of ATC and for each ATC there is a separate instance of  this task. This task is responsible for checking whether the planes in its zone have any intersecting paths or not and if there are any then it redirects the plane by sending the new path to the planes which would intercept in its zone. It uses CABS for reading the required information of plane like the PlaneId, Source Airport, Destination Airport, current position, speed. This task is active only during the period for which a plane is in its zone.

TASK display_ATC_info:	[SOFT TASK		WCET = 10000,	TIMEPERIOD = 100000]
This task is responsible to display which planes are flying over which atc zones.


Plane moves from the source airport to destination airport which are assigned randomly whenever a plane is created. It dynamically changes its path on the instruction of the ATC of the zone where it is about to collide to the new path provided by the ATC.

TASK plane:			[SOFT TASK		WCET=200,		TIMEPERIOD = 40000]
This task simulates the moving of the plane from source to destination airport. For each plane there is separate instance of this task. It also takes various speeds into consideration We have used CABS to send information like the planes’ current position to the corresponding ATC in which it is moving currently.

TASK register_with_ATC:	[SOFT TASK		WCET=50,		TIMEPERIOD = 40000]
This task is created corresponding to each plane and terminated when the plane stops flying ,i.e, reaches its destination airport. It looks after the process of registering with the corresponding ATC whenever the plane is in that zone.

TASK display_plane_info:	[SOFT TASK	           WCET=10000,		TIMEPERIOD = 80000]
This task is responsible to display the information regarding planes like current position, speed, model type, source airport, destination airport.
TASK draw_sim_area:	[SOFT TASK		WCET=2400,		TIMEPERIOD = 160000]
This task runs independently of others periodically refreshing the simulation area. We identified this process as a task due to the reason that if its functionality would have been embedded within the plane then it would be an unnecessary overhead for the plane to remember and redraw the part of the grid which it overwrites while moving. Also, if the number of planes flying simultaneously increases, then the overhead for each plane will be a lot. So this task frees all others from the overhead of refreshing the simulation area. We have kept the period of this task higher than all other tasks.
Structures:
airport
{	int id;				//identification number of the airport
	char airportname[25];		//name of the airport
	int x;				//x coordinate of the airport
	int y;				//y coordinate of the airport
	int airportsize;			//size of the airport in pixels		
}
aeroplane				//it is global and contains all information about an aeroplane
{	int id;				//id of the plane, which is the id of the corresponding task
	int model_id;			//to map to the model that we are using
	int curr_speed;		//current speed with which the plane is flying
	int curr_altitude;		//current altitude at which the plane is flying
	int src_airport_id;		//airport id of the source
	int dest_airport_id;		//airport id of the destination
	int currx;			//current x position of the plane
	int curry;			//current y position of the plane
	int xtemp;			//temporary x destination when redirected
	int ytemp;			//temporary y destination when redirected
	int dept_time;			//departure time of the plane
	int arr_time;			//arrival time of the plane
	int zone_id;			//to specify in which zone the plane is flying
	int is_flying;			//indicate the status of the plane whether flying or landed
}
aeroplane_model_info;
{	int model_id;			//Model ID of the model of a plane
	char model[20];		//model name of the plane
	int year_of_manu;		//manufacturing year of the plane model
	int max_passengers;		//maximum number of passengers allowed
	int weight;			//weight
	int planesize;
	int min_speed;
	int max_speed;
	int min_altitude;
	int max_altitude;
}

atc
{	int id;				//Air Traffic Controller’s ID
	int x;				//Air Traffic Controller’s x coordinate
	int y;				//Air Traffic Controller’s y coordinate
}
atcplanecab
{	char written;			
	int xtemp;			//temporary x destination when redirected
	int ytemp;			//temporary y destination when redirected
}

General Flow of the Simulation

 SHAPE  \* MERGEFORMAT 










RTOS		ATCSim



	 PAGE 3






MAIN

plane

manager_ATC

draw_sim_area

display_plane_info

register_with_ATC

recv_reg

display_ATC_info

Access structure “planeinzone”



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