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Background

I’m working on it

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 FlightStageSelectorMode where PM will figure out what stage 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.

Main Structure of PM

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

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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

// 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{
2  WaypointType waypoint_type;  // not necessary
3
4  // heading unit vector and magnitude
5  float dist_x; 
6  float dist_y; 
7  float dist_z; 
8  float magnitude; // Magnitude distance to waypoint target
9  float heading; // heading at target waypoint
10  double speed_target; // Target velocity of drone approaching target
11} CommandsForAM;

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