81 lines
3.2 KiB
Go
81 lines
3.2 KiB
Go
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package basic
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import (
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"math"
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"testing"
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"time"
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)
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// 解析速率与中心差分必须给出同一个接触度量导数：点源目标曾把零位置当站心位置，
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// 减掉观测者速度后得到日尺度的假速率，掩带边界因此无法加密。
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// The analytic contact rate must agree with the central difference for every target
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// kind: the point-source branch once treated a zero position as a topocentric vector
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// and produced a spurious diurnal rate that stopped the band boundary from refining.
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func TestOccultationContactRateMatchesCentralDifference(t *testing.T) {
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const tolerance = 0.01 // 度/日
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star := hr4799OccultationCoordinateForTest()
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infinite := star
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infinite.ParallaxMas = 0
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parallaxStar := star
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parallaxStar.ParallaxMas = 10
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planetConfig, _ := planetOccultationConfigFor(OccultationMercury)
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planetCache := newPlanetOccultationEventCache(planetConfig)
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starEvaluation := func(coordinate StarCoordinate) func(float64) occultationRiseSetEvaluation {
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cache := newStarOccultationEventCache(coordinate)
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return newOccultationRiseSetEvaluationCache(cache.riseSetContextAt).evaluation
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}
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cases := []struct {
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name string
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sampleTime time.Time
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evaluation func(float64) occultationRiseSetEvaluation
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}{
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{"point-source star", time.Date(2025, 6, 5, 10, 0, 0, 0, time.UTC), starEvaluation(infinite)},
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{"finite star", time.Date(2025, 6, 5, 10, 0, 0, 0, time.UTC), starEvaluation(parallaxStar)},
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{"planet", time.Date(2024, 8, 21, 10, 0, 0, 0, time.UTC), newOccultationRiseSetEvaluationCache(planetCache.riseSetContextAt).evaluation},
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}
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sites := [][2]float64{{0, 0}, {115, 33}, {-74, 40}, {179, 80}, {-123, -64}}
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for _, testCase := range cases {
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tt := occultationTimeToTT(testCase.sampleTime)
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evaluation := testCase.evaluation(tt)
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for _, site := range sites {
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analytic := evaluation.contactRateAt(site[0], site[1])
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reference := evaluation.contactDerivative(site[0], site[1])
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if !finite(analytic) || !finite(reference) {
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t.Fatalf("%s lon=%g lat=%g: analytic=%g reference=%g", testCase.name, site[0], site[1], analytic, reference)
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}
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if math.Abs(analytic-reference) > tolerance {
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t.Errorf("%s lon=%g lat=%g: analytic=%.6f reference=%.6f degrees/day",
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testCase.name, site[0], site[1], analytic, reference)
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}
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}
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}
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}
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// 无视差恒星的掩带边界必须加密到请求的地面间距：修复前相邻点可达 150 km。
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func TestStarOccultationBandContourSpacing(t *testing.T) {
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star := hr4799OccultationCoordinateForTest()
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start := time.Date(2025, 6, 5, 0, 0, 0, 0, time.UTC)
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paths, err := FindStarOccultationPaths(start, start.Add(24*time.Hour), star,
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OccultationPathOptions{Step: 5 * time.Minute, TargetSpacingKM: 30, DisableFootprints: true, DisableRiseSet: true})
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if err != nil {
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t.Fatal(err)
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}
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const limitKM = 45.0
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sampled := 0
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for _, path := range paths {
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for branch, contour := range path.BandContours {
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for index := 1; index < len(contour); index++ {
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spacing := occultationPathDistanceKM(contour[index-1], contour[index])
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sampled++
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if spacing > limitKM {
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t.Fatalf("branch %d sample %d: spacing %.3f km exceeds %.0f km", branch, index, spacing, limitKM)
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}
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}
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}
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}
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if sampled == 0 {
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t.Fatal("no band contour samples")
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}
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}
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