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Background

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Reasoning Behind Restructuring

We are once again restructuring path manager! The current goal is to restructure PM so that it focuses more on path management while AM will take care of movement such as calculating roll, pitch, yaw, and adjusting throttle.

State Machine Changes

Some state names have been renamed to better reflect what is happening within the state. resetVariables has been renamed to FlightModeSelector FlightStageSelectorMode where PM will figure out what flight mode and flight stage it is instage of flight needs to be executed.

The coordinateTurnElevation state has been removed as it previously calculated roll, pitch, yaw, etc which has been passed onto AM. Now, the desired heading is calculated in one of the flight modes and is passed to AM to make movement calculations.

There are currently two flight modes: CruisingMode and LandingTakeoffMode. Within LandingTakeoffMode there are three possible stages: PreflightStage, TakeoffStage, LandingStage (not shown in diagram, will draw a new one later)

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Main Structure of PM

A diagram of the general flow of Path Manager, including its modes, stages, and states can be found below.

PM has been sectioned into to main modes: CommsWithSystemManagerMode, and FlightStageSelectorMode. Within CommsWithSystemManagerMode, PM will get the relevant instructions and information from AM, TM, and Sensor Fusion. This retrieval process is separated into three stages CommsWithAMStage, CommsWithTMStage, CommsWithSFStage where PM will get information from both managers and sensor fusion respectively. Note: The stages originally created to get information from AM, TM, and SF have been combined into one stage within CommsWithSystemManagerMode.

PM will check if the drone is under manual control by receiving a WaypointType . If it is not under manual control, it will enter FlightStageSelectorMode, the main part of the state machine. Within this mode, PM will change flight states if triggered to do so. While flying, PM may enter any of the following flight states: Disarmed, Takeoff, Cruising, Landing, and Landed. Note: a Preflight state may be added. If we are in the Disarmed state or Landed state PM will go back to the start. However, if we are in Takeoff, Cruising, or Landing, PM will execute their respective stages.

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Important Structs

Note: All messages to Path Manager will be coming from System Manager in a single packet:

SM → PM

typedef struct CommandsFromSM {
    CommandsFromTM telemetry_commands;
    JetsonToZpMovementCommand jetson_commands; 
    LandingInitiationCommand landing_initiation; 
    LosSFData sf_data;
} CommandsFromSM;

and CV will be sending a list of waypoints during Cruise and Search (sent through TM and SM) where a single waypoint is defined in the TelemWaypointData struct below. The start_landing flag will be signaled when a landing pad is found.

CV/TM → PM During Cruising

struct TelemWaypointData {    
  double longitude;  //    
  double lattiude;   
  uint8_t waypoint_id; 
};

typedef struct CommandsFromTM{
    uint8_t num_waypoints; // number of waypoints in the list 
    TelemWaypointData waypoints[num_waypoints]; 
} CommandsFromTM;

CV/TM → PM During Search For Landing Pad

// Data given from CV/TM during search and landing 
struct JetsonToZpMovementCommand {
  float x;
  float y;
  float z;
  float heading;
};

struct LandingInitiationCommand {
    bool start_landing; 
};

PM → AM Struct:

typedef struct CommandsForAM_t{
  float dist_forward; //pitch
  float dist_right; // roll
  float dist_up; //yaw
  float magnitude; // Magnitude distance to waypoint target
  float heading; // heading at target waypoint
  double velocity_target; // Target velocity of drone approaching target
} CommandsForAM;