FA-69776 / Orbital propagation / Open access

Radial in-track cross-track projection: In-track axis points backwards · case 01

Deputies ahead of the chief are reported behind it.

Verified by executionVariant 1 · 7 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

I is computed as R x C instead of C x R.

VERIFIED REPAIR

Use I = C x R.

Unsuccessful approach: Using the velocity direction is not orthogonal to R on eccentric orbits.

Case contract

Input [rc, vc, rd]: chief position and velocity and deputy position. R=rc/|rc|, C=(rc x vc)/|rc x vc|, I=C x R. Return the deputy offset rd-rc projected onto [R, I, C], rounded to 6.

Why this case matters

Orbit determination and mission planning chain many small conversions; one wrong branch or unit silently moves a spacecraft by kilometres.

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import math
N = 1
observations = []
def solve(x):
    rc,vc,rd=x
    def dot(a,b): return sum(p*q for p,q in zip(a,b))
    def cross(a,b): return [a[1]*b[2]-a[2]*b[1],a[2]*b[0]-a[0]*b[2],a[0]*b[1]-a[1]*b[0]]
    def unit(a):
        m=math.sqrt(dot(a,a))
        return [q/m for q in a]
    R=unit(rc)
    C=unit(cross(rc,vc))
    I=cross(R,C)
    d=[p-q for p,q in zip(rd,rc)]
    return [round(dot(d,R),6),round(dot(d,I),6),round(dot(d,C),6)]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]], [1.0, 2.0, 3.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]', [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]], [0.0, 5.0, 0.0]), ('radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]', [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]], [10.0, -10.46518, -2.545584]), ('radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]', [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]], [0.980196, -3.240487, 2.353394]), ('radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]', [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]], [0.0, 1.414214, 0.0]), ('radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]', [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]], [0.1, 0.2, -0.3]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]], [0.0, 0.0, 0.0])], [('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]', [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]], [0.0, 5.0, 0.0]), ('radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]', [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]], [0.980196, -3.240487, 2.353394]), ('radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]', [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]], [0.0, 1.414214, 0.0]), ('radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]', [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]], [0.1, 0.2, -0.3]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]], [0.0, 0.0, 0.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]], [1.0, 2.0, 3.0]), ('radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]', [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]], [10.0, -10.46518, -2.545584])], [('radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]', [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]], [10.0, -10.46518, -2.545584]), ('radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]', [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]], [0.1, 0.2, -0.3]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]], [0.0, 0.0, 0.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]], [1.0, 2.0, 3.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]', [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]], [0.0, 5.0, 0.0]), ('radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]', [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]], [0.980196, -3.240487, 2.353394]), ('radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]', [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]], [0.0, 1.414214, 0.0])], [('radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]', [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]], [0.980196, -3.240487, 2.353394]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]', [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]], [0.0, 5.0, 0.0]), ('radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]', [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]], [10.0, -10.46518, -2.545584]), ('radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]', [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]], [0.0, 1.414214, 0.0]), ('radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]', [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]], [0.1, 0.2, -0.3]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]], [0.0, 0.0, 0.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]], [1.0, 2.0, 3.0])], [('radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]', [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]], [0.0, 1.414214, 0.0]), ('radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]', [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]], [0.980196, -3.240487, 2.353394]), ('radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]', [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]], [0.1, 0.2, -0.3]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]], [0.0, 0.0, 0.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]], [1.0, 2.0, 3.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]', [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]], [0.0, 5.0, 0.0]), ('radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]', [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]], [10.0, -10.46518, -2.545584])]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]	`[1.0, -2.0, 3.0]`	`[1.0, 2.0, 3.0]`	Failed
radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]	`[0.0, -5.0, 0.0]`	`[0.0, 5.0, 0.0]`	Failed
radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]	`[10.0, 10.46518, -2.545584]`	`[10.0, -10.46518, -2.545584]`	Failed
radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]	`[0.980196, 3.240487, 2.353394]`	`[0.980196, -3.240487, 2.353394]`	Failed
radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]	`[0.0, -1.414214, 0.0]`	`[0.0, 1.414214, 0.0]`	Failed
radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]	`[0.1, -0.2, -0.3]`	`[0.1, 0.2, -0.3]`	Failed
radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]	`[0.0, 0.0, 0.0]`	`[0.0, 0.0, 0.0]`	Passed

SHA-256 / fada17eb08b295ea2b2d95fb7aaaa31b16558a6e8863395f795868c985a5ef4b

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import math
N = 1
observations = []
def solve(x):
    rc,vc,rd=x
    def dot(a,b): return sum(p*q for p,q in zip(a,b))
    def cross(a,b): return [a[1]*b[2]-a[2]*b[1],a[2]*b[0]-a[0]*b[2],a[0]*b[1]-a[1]*b[0]]
    def unit(a):
        m=math.sqrt(dot(a,a))
        return [q/m for q in a]
    R=unit(rc)
    C=unit(cross(rc,vc))
    I=unit(vc)
    d=[p-q for p,q in zip(rd,rc)]
    return [round(dot(d,R),6),round(dot(d,I),6),round(dot(d,C),6)]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]], [1.0, 2.0, 3.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]', [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]], [0.0, 5.0, 0.0]), ('radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]', [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]], [10.0, -10.46518, -2.545584]), ('radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]', [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]], [0.980196, -3.240487, 2.353394]), ('radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]', [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]], [0.0, 1.414214, 0.0]), ('radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]', [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]], [0.1, 0.2, -0.3]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]], [0.0, 0.0, 0.0])], [('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]', [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]], [0.0, 5.0, 0.0]), ('radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]', [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]], [0.980196, -3.240487, 2.353394]), ('radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]', [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]], [0.0, 1.414214, 0.0]), ('radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]', [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]], [0.1, 0.2, -0.3]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]], [0.0, 0.0, 0.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]], [1.0, 2.0, 3.0]), ('radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]', [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]], [10.0, -10.46518, -2.545584])], [('radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]', [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]], [10.0, -10.46518, -2.545584]), ('radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]', [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]], [0.1, 0.2, -0.3]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]], [0.0, 0.0, 0.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]], [1.0, 2.0, 3.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]', [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]], [0.0, 5.0, 0.0]), ('radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]', [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]], [0.980196, -3.240487, 2.353394]), ('radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]', [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]], [0.0, 1.414214, 0.0])], [('radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]', [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]], [0.980196, -3.240487, 2.353394]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]', [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]], [0.0, 5.0, 0.0]), ('radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]', [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]], [10.0, -10.46518, -2.545584]), ('radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]', [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]], [0.0, 1.414214, 0.0]), ('radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]', [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]], [0.1, 0.2, -0.3]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]], [0.0, 0.0, 0.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]], [1.0, 2.0, 3.0])], [('radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]', [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]], [0.0, 1.414214, 0.0]), ('radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]', [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]], [0.980196, -3.240487, 2.353394]), ('radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]', [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]], [0.1, 0.2, -0.3]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]], [0.0, 0.0, 0.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]], [1.0, 2.0, 3.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]', [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]], [0.0, 5.0, 0.0]), ('radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]', [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]], [10.0, -10.46518, -2.545584])]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]	`[1.0, 2.0, 3.0]`	`[1.0, 2.0, 3.0]`	Passed
radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]	`[0.0, 4.95614, 0.0]`	`[0.0, 5.0, 0.0]`	Failed
radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]	`[10.0, -10.46518, -2.545584]`	`[10.0, -10.46518, -2.545584]`	Passed
radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]	`[0.980196, -3.220644, 2.353394]`	`[0.980196, -3.240487, 2.353394]`	Failed
radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]	`[0.0, 1.414214, 0.0]`	`[0.0, 1.414214, 0.0]`	Passed
radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]	`[0.1, 0.223607, -0.3]`	`[0.1, 0.2, -0.3]`	Failed
radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]	`[0.0, 0.0, 0.0]`	`[0.0, 0.0, 0.0]`	Passed

SHA-256 / f8ee27dd5a80115c171181b93996103fa47014ced28fed3ea77df8aea8fbff6f

3 / The verified repair

Exit 0

"""Failure Map reference implementation. Python standard library only."""
import json
import math
N = 1
observations = []
def solve(x):
    rc,vc,rd=x
    def dot(a,b): return sum(p*q for p,q in zip(a,b))
    def cross(a,b): return [a[1]*b[2]-a[2]*b[1],a[2]*b[0]-a[0]*b[2],a[0]*b[1]-a[1]*b[0]]
    def unit(a):
        m=math.sqrt(dot(a,a))
        return [q/m for q in a]
    R=unit(rc)
    C=unit(cross(rc,vc))
    I=cross(C,R)
    d=[p-q for p,q in zip(rd,rc)]
    return [round(dot(d,R),6),round(dot(d,I),6),round(dot(d,C),6)]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]], [1.0, 2.0, 3.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]', [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]], [0.0, 5.0, 0.0]), ('radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]', [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]], [10.0, -10.46518, -2.545584]), ('radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]', [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]], [0.980196, -3.240487, 2.353394]), ('radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]', [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]], [0.0, 1.414214, 0.0]), ('radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]', [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]], [0.1, 0.2, -0.3]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]], [0.0, 0.0, 0.0])], [('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]', [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]], [0.0, 5.0, 0.0]), ('radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]', [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]], [0.980196, -3.240487, 2.353394]), ('radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]', [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]], [0.0, 1.414214, 0.0]), ('radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]', [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]], [0.1, 0.2, -0.3]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]], [0.0, 0.0, 0.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]], [1.0, 2.0, 3.0]), ('radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]', [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]], [10.0, -10.46518, -2.545584])], [('radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]', [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]], [10.0, -10.46518, -2.545584]), ('radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]', [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]], [0.1, 0.2, -0.3]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]], [0.0, 0.0, 0.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]], [1.0, 2.0, 3.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]', [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]], [0.0, 5.0, 0.0]), ('radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]', [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]], [0.980196, -3.240487, 2.353394]), ('radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]', [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]], [0.0, 1.414214, 0.0])], [('radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]', [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]], [0.980196, -3.240487, 2.353394]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]', [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]], [0.0, 5.0, 0.0]), ('radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]', [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]], [10.0, -10.46518, -2.545584]), ('radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]', [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]], [0.0, 1.414214, 0.0]), ('radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]', [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]], [0.1, 0.2, -0.3]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]], [0.0, 0.0, 0.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]], [1.0, 2.0, 3.0])], [('radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]', [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]], [0.0, 1.414214, 0.0]), ('radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]', [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]], [0.980196, -3.240487, 2.353394]), ('radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]', [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]], [0.1, 0.2, -0.3]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]], [0.0, 0.0, 0.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]', [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]], [1.0, 2.0, 3.0]), ('radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]', [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]], [0.0, 5.0, 0.0]), ('radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]', [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]], [10.0, -10.46518, -2.545584])]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7001.0, 2.0, 3.0]]	`[1.0, 2.0, 3.0]`	`[1.0, 2.0, 3.0]`	Passed
radial in-track cross-track projection [[7000.0, 0.0, 0.0], [1.0, 7.5, 0.0], [7000.0, 5.0, 0.0]]	`[0.0, 5.0, 0.0]`	`[0.0, 5.0, 0.0]`	Passed
radial in-track cross-track projection [[0.0, 7000.0, 0.0], [-7.0, 0.0, 1.0], [10.0, 7010.0, -4.0]]	`[10.0, -10.46518, -2.545584]`	`[10.0, -10.46518, -2.545584]`	Passed
radial in-track cross-track projection [[5000.0, 5000.0, 1000.0], [-5.0, 5.0, 1.0], [5003.0, 4998.0, 1002.0]]	`[0.980196, -3.240487, 2.353394]`	`[0.980196, -3.240487, 2.353394]`	Passed
radial in-track cross-track projection [[6778.0, 0.0, 0.0], [0.0, 5.3, 5.3], [6778.0, 1.0, 1.0]]	`[0.0, 1.414214, 0.0]`	`[0.0, 1.414214, 0.0]`	Passed
radial in-track cross-track projection [[1.0, 0.0, 0.0], [0.5, 1.0, 0.0], [1.1, 0.2, -0.3]]	`[0.1, 0.2, -0.3]`	`[0.1, 0.2, -0.3]`	Passed
radial in-track cross-track projection [[7000.0, 0.0, 0.0], [0.0, 7.5, 0.0], [7000.0, 0.0, 0.0]]	`[0.0, 0.0, 0.0]`	`[0.0, 0.0, 0.0]`	Passed

SHA-256 / 7c6ecc26f88d7e1869090bfd39b899cd571b58f00319e007921339ea3b3412e7

Verification & scope

A deterministic toy two-body model with stipulated constants and conventions; not flight dynamics software or a validated SGP4 implementation. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:48:14.503927+00:00.

Case digest / e07c314dff1fda4f911b3f5c189a39a720f2cf7a17a511c4538aaf5b8859ede3