diff --git a/cmd/sdrd/pipeline_runtime.go b/cmd/sdrd/pipeline_runtime.go
index f38a0d3..6843594 100644
--- a/cmd/sdrd/pipeline_runtime.go
+++ b/cmd/sdrd/pipeline_runtime.go
@@ -219,7 +219,16 @@ func (rt *dspRuntime) buildSurveillanceResult(art *spectrumArtifacts) pipeline.S
 	policy := pipeline.PolicyFromConfig(rt.cfg)
 	candidates := pipeline.CandidatesFromSignals(art.detected, "surveillance-detector")
 	scheduled := pipeline.ScheduleCandidates(candidates, policy)
+	level := pipeline.AnalysisLevel{
+		Name:       "surveillance",
+		SampleRate: rt.cfg.SampleRate,
+		FFTSize:    rt.cfg.Surveillance.AnalysisFFTSize,
+		CenterHz:   rt.cfg.CenterHz,
+		SpanHz:     float64(rt.cfg.SampleRate),
+		Source:     "baseband",
+	}
 	return pipeline.SurveillanceResult{
+		Level:      level,
 		Candidates: candidates,
 		Scheduled:  scheduled,
 		Finished:   art.finished,
@@ -262,7 +271,16 @@ func (rt *dspRuntime) buildRefinementInput(surv pipeline.SurveillanceResult) pip
 			Source:   windowSource,
 		})
 	}
+	level := pipeline.AnalysisLevel{
+		Name:       "refinement",
+		SampleRate: rt.cfg.SampleRate,
+		FFTSize:    rt.cfg.FFTSize,
+		CenterHz:   rt.cfg.CenterHz,
+		SpanHz:     float64(rt.cfg.SampleRate),
+		Source:     "refinement-window",
+	}
 	input := pipeline.RefinementInput{
+		Level:      level,
 		Candidates: append([]pipeline.Candidate(nil), surv.Candidates...),
 		Scheduled:  scheduled,
 		Plan:       plan,
diff --git a/internal/pipeline/phases.go b/internal/pipeline/phases.go
index 138cd95..fb7148f 100644
--- a/internal/pipeline/phases.go
+++ b/internal/pipeline/phases.go
@@ -2,7 +2,17 @@ package pipeline
 
 import "sdr-wideband-suite/internal/detector"
 
+type AnalysisLevel struct {
+	Name       string  `json:"name"`
+	SampleRate int     `json:"sample_rate"`
+	FFTSize    int     `json:"fft_size"`
+	CenterHz   float64 `json:"center_hz"`
+	SpanHz     float64 `json:"span_hz"`
+	Source     string  `json:"source,omitempty"`
+}
+
 type SurveillanceResult struct {
+	Level      AnalysisLevel        `json:"level"`
 	Candidates []Candidate          `json:"candidates"`
 	Scheduled  []ScheduledCandidate `json:"scheduled,omitempty"`
 	Finished   []detector.Event     `json:"finished"`
@@ -21,6 +31,7 @@ type RefinementPlan struct {
 }
 
 type RefinementInput struct {
+	Level      AnalysisLevel        `json:"level"`
 	Candidates []Candidate          `json:"candidates,omitempty"`
 	Scheduled  []ScheduledCandidate `json:"scheduled,omitempty"`
 	Plan       RefinementPlan       `json:"plan,omitempty"`
diff --git a/internal/pipeline/phases_test.go b/internal/pipeline/phases_test.go
index 2c45c45..49987df 100644
--- a/internal/pipeline/phases_test.go
+++ b/internal/pipeline/phases_test.go
@@ -29,6 +29,7 @@ func TestSurveillanceResultCarriesScheduledCandidates(t *testing.T) {
 
 func TestRefinementInputCarriesScheduledCandidates(t *testing.T) {
 	res := RefinementInput{
+		Level:      AnalysisLevel{Name: "refinement"},
 		Candidates: []Candidate{{ID: 2}},
 		Scheduled:  []ScheduledCandidate{{Candidate: Candidate{ID: 2}, Priority: 4}},
 		Plan: RefinementPlan{