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66 lines
1.9 KiB
66 lines
1.9 KiB
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#include <catch2/catch.hpp> |
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#include <glm/glm.hpp> |
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#include "../src/orbits.cpp" |
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// NOTE: using WithinAbs instead of Approx because: |
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// https://github.com/catchorg/Catch2/issues/1962 |
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// https://github.com/catchorg/Catch2/issues/1507 |
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using Catch::Matchers::WithinAbs; |
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TEST_CASE("orbit construction", "[orbits]") |
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{ |
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} |
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// NOTE: example 4.6 in "Space Flight Dynamics" by Craig A. Kluever |
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TEST_CASE("orbit propagation", "[orbits]") |
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{ |
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orbital_elements orbit = {}; |
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// TODO: might want another contructor for ellipse_parameters |
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double a = 26564.5; // kilometers |
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double e = 0.7411; |
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double b = a * sqrt(1 - pow(e, 2.0)); |
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ellipse_parameters ep = constructEllipse(a, b); |
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orbit.ep = ep; |
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double initial_anom = 260 * M_PI / 180; // radians |
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unsigned int time_step = 60 * 50; // seconds |
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// NOTE: solve for gravitational parameter from mean motion |
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double mean_motion = 0.00014582; // rad/s |
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orbit.mu = pow(mean_motion, 2) * pow(ep.a, 3); |
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double E1 = getEccAnomFromTrueAnom(ep.e, initial_anom); |
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REQUIRE_THAT(E1, WithinAbs(-0.8615, 1e-4)); |
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double M1 = getMeanAnomFromEccAnom(E1, ep.e); |
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REQUIRE_THAT(M1, WithinAbs(-0.2992, 1e-4)); |
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double n = getMeanMotion(orbit.mu, orbit.ep.a); |
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REQUIRE_THAT(n, WithinAbs(0.00014582, 1e-8)); |
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double M2 = getPropagatedMeanAnom(M1, n, time_step); |
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REQUIRE_THAT(M2, WithinAbs(0.1383, 1e-5)); |
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// TODO: could also test for the other trial values listed in table 4.1 |
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double E2_1 = getInitialTrialValue(M2, ep.e); |
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REQUIRE_THAT(E2_1, WithinAbs(0.315452, 1e-5)); |
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double ecc_anom = getPropagatedEccAnomaly(orbit, initial_anom, time_step); |
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REQUIRE_THAT(ecc_anom, WithinAbs(0.481518, 1e-5)); |
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double true_anom = getPropagatedTrueAnomaly(orbit, initial_anom, time_step); |
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REQUIRE_THAT(true_anom, WithinAbs(1.1339, 1e-4)); |
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double r2 = getRadialPosition(ep, true_anom); |
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REQUIRE_THAT(r2, WithinAbs(9116.1, 0.1)); |
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glm::vec2 pos = polarToRect(true_anom, r2); |
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REQUIRE_THAT(pos.x, WithinAbs(3856.9, 0.1)); |
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REQUIRE_THAT(pos.y, WithinAbs(8259.9, 0.1)); |
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} |
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