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jsbsim-service/shared/schemas/flight-sim-api.schema.json
2026-04-28 17:49:06 +08:00

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{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"$id": "https://local-flight-sim/schemas/flight-sim-api.schema.json",
"title": "Local Flight Simulation API",
"description": "Shared wire schema for the Web client and local simulation service. Heading convention: true heading 0 degrees points north, clockwise is positive, counter-clockwise is negative.",
"$defs": {
"Vec3": {
"type": "array",
"items": { "type": "number" },
"minItems": 3,
"maxItems": 3
},
"Quat": {
"type": "array",
"items": { "type": "number" },
"minItems": 4,
"maxItems": 4,
"description": "[x, y, z, w]"
},
"InitialState": {
"type": "object",
"required": ["position", "velocityMps"],
"properties": {
"position": {
"$ref": "#/$defs/Vec3",
"description": "Local meters [east, up, north]."
},
"rotation": { "$ref": "#/$defs/Quat" },
"velocityMps": { "type": "number", "exclusiveMinimum": 0 },
"headingDeg": {
"type": "number",
"description": "True heading. 0 is north, clockwise positive, counter-clockwise negative."
}
},
"additionalProperties": true
},
"FlightSample": {
"type": "object",
"required": ["t", "position", "rotation", "velocityMps", "headingDeg"],
"properties": {
"t": { "type": "number", "minimum": 0 },
"position": {
"$ref": "#/$defs/Vec3",
"description": "Local meters [east, up, north]."
},
"rotation": { "$ref": "#/$defs/Quat" },
"velocityMps": { "type": "number" },
"headingDeg": {
"type": "number",
"description": "True heading. 0 is north, clockwise positive, counter-clockwise negative."
},
"angularVelocity": { "$ref": "#/$defs/Vec3" },
"alphaDeg": { "type": "number" },
"betaDeg": { "type": "number" },
"loadFactor": { "type": "number" },
"mach": { "type": "number" },
"qbar": { "type": "number" },
"verticalSpeedMps": { "type": "number" },
"pitchRateDegS": { "type": "number" },
"rollRateDegS": { "type": "number" },
"yawRateDegS": { "type": "number" },
"throttle": { "type": "number" },
"controlInputs": {
"type": "object",
"properties": {
"elevator": { "type": "number" },
"aileron": { "type": "number" },
"rudder": { "type": "number" },
"throttle": { "type": "number" },
"tvc": { "type": "number" },
"speedbrake": { "type": "number" }
},
"additionalProperties": false
},
"controlSurfaces": {
"type": "object",
"properties": {
"elevatorDeg": { "type": "number" },
"aileronDeg": { "type": "number" },
"rudderDeg": { "type": "number" },
"tvcDeg": { "type": "number" },
"speedbrakeNorm": { "type": "number" }
},
"additionalProperties": false
},
"fcs": {
"type": "object",
"properties": {
"tvcPosNorm": { "type": "number" },
"tvcInhibit": { "type": "number" },
"thrustNorm": { "type": "number" },
"throttleOverride": { "type": "number" },
"pitchRateCmd": { "type": "number" }
},
"additionalProperties": true
}
},
"additionalProperties": true
},
"SimulateRequest": {
"type": "object",
"required": ["aircraftId", "sampleRateHz", "durationSec", "initialState", "maneuver"],
"properties": {
"aircraftId": { "type": "string" },
"sampleRateHz": { "type": "number", "exclusiveMinimum": 0 },
"integrationRateHz": {
"type": "number",
"exclusiveMinimum": 0,
"description": "Internal dynamics integration frequency. JSBSim defaults to 120 Hz; sampleRateHz remains the output sampling frequency."
},
"trim": {
"type": "boolean",
"description": "Whether the backend should attempt trim before simulation. F-22 maneuver research may use false when JSBSim trim cannot find a steady state."
},
"durationSec": { "type": "number", "exclusiveMinimum": 0 },
"initialState": { "$ref": "#/$defs/InitialState" },
"maneuver": {
"type": "object",
"required": ["type"],
"properties": {
"type": {
"type": "string",
"enum": ["straight", "climb", "descent", "level-turn", "control-script", "cobra"]
},
"parameters": {
"type": "object",
"description": "Maneuver-specific parameters. Cobra supports controlMode=open-loop|closed-loop. Closed-loop Cobra parameters include targetAlphaDeg, recoveryAlphaDeg, pitchRateLimitDegS, holdPitchRateDegS, pullDurationSec, holdDurationSec, recoveryDurationSec, maxElevatorCmd, recoveryElevatorCmd, pullTvcCmd, recoveryTvcCmd, throttleCmd, and speedbrakeCmd.",
"additionalProperties": true
}
},
"additionalProperties": false
}
},
"additionalProperties": false
}
}
}