diff --git a/cmd/sdrd/dsp_loop.go b/cmd/sdrd/dsp_loop.go
index b1ba8e1..b7d71aa 100644
--- a/cmd/sdrd/dsp_loop.go
+++ b/cmd/sdrd/dsp_loop.go
@@ -57,12 +57,13 @@ func runDSP(ctx context.Context, srcMgr *sourceManager, cfg config.Config, det *
 				rt.gotSamples = true
 			}
 			state.surveillance = rt.buildSurveillanceResult(art)
+			state.refinementInput = rt.buildRefinementInput(state.surveillance)
 			finished := state.surveillance.Finished
 			thresholds := state.surveillance.Thresholds
 			noiseFloor := state.surveillance.NoiseFloor
 			var displaySignals []detector.Signal
 			if len(art.iq) > 0 {
-				state.refinement = rt.refineSignals(art, state.surveillance.Scheduled, extractMgr, rec)
+				state.refinement = rt.refineSignals(art, state.refinementInput, extractMgr, rec)
 				displaySignals = state.refinement.Signals
 				if rec != nil && len(displaySignals) > 0 && len(art.allIQ) > 0 {
 					aqCfg := extractionConfig{firTaps: rt.cfg.Recorder.ExtractionTaps, bwMult: rt.cfg.Recorder.ExtractionBwMult}
diff --git a/cmd/sdrd/phase_state.go b/cmd/sdrd/phase_state.go
index 11f053c..dba7007 100644
--- a/cmd/sdrd/phase_state.go
+++ b/cmd/sdrd/phase_state.go
@@ -3,6 +3,7 @@ package main
 import "sdr-wideband-suite/internal/pipeline"
 
 type phaseState struct {
-	surveillance pipeline.SurveillanceResult
-	refinement   pipeline.RefinementResult
+	surveillance    pipeline.SurveillanceResult
+	refinementInput pipeline.RefinementInput
+	refinement      pipeline.RefinementResult
 }
diff --git a/cmd/sdrd/phase_state_test.go b/cmd/sdrd/phase_state_test.go
index 7843b3d..ca22d84 100644
--- a/cmd/sdrd/phase_state_test.go
+++ b/cmd/sdrd/phase_state_test.go
@@ -8,12 +8,16 @@ import (
 
 func TestPhaseStateCarriesPhaseResults(t *testing.T) {
 	ps := &phaseState{
-		surveillance: pipeline.SurveillanceResult{NoiseFloor: -90, Scheduled: []pipeline.ScheduledCandidate{{Candidate: pipeline.Candidate{ID: 1}, Priority: 5}}},
-		refinement:   pipeline.RefinementResult{Decisions: []pipeline.SignalDecision{{ShouldRecord: true}}, Candidates: []pipeline.Candidate{{ID: 1}}},
+		surveillance:    pipeline.SurveillanceResult{NoiseFloor: -90, Scheduled: []pipeline.ScheduledCandidate{{Candidate: pipeline.Candidate{ID: 1}, Priority: 5}}},
+		refinementInput: pipeline.RefinementInput{Scheduled: []pipeline.ScheduledCandidate{{Candidate: pipeline.Candidate{ID: 1}, Priority: 5}}, SampleRate: 2048000, FFTSize: 2048, CenterHz: 7.1e6},
+		refinement:      pipeline.RefinementResult{Decisions: []pipeline.SignalDecision{{ShouldRecord: true}}, Candidates: []pipeline.Candidate{{ID: 1}}},
 	}
 	if ps.surveillance.NoiseFloor != -90 || len(ps.surveillance.Scheduled) != 1 {
 		t.Fatalf("unexpected surveillance state: %+v", ps.surveillance)
 	}
+	if len(ps.refinementInput.Scheduled) != 1 || ps.refinementInput.SampleRate != 2048000 {
+		t.Fatalf("unexpected refinement input: %+v", ps.refinementInput)
+	}
 	if len(ps.refinement.Decisions) != 1 || !ps.refinement.Decisions[0].ShouldRecord || len(ps.refinement.Candidates) != 1 {
 		t.Fatalf("unexpected refinement state: %+v", ps.refinement)
 	}
diff --git a/cmd/sdrd/pipeline_runtime.go b/cmd/sdrd/pipeline_runtime.go
index f30830f..bf2adc7 100644
--- a/cmd/sdrd/pipeline_runtime.go
+++ b/cmd/sdrd/pipeline_runtime.go
@@ -43,14 +43,14 @@ type dspRuntime struct {
 }
 
 type spectrumArtifacts struct {
-	allIQ         []complex64
-	iq            []complex64
-	spectrum      []float64
-	finished      []detector.Event
-	detected      []detector.Signal
-	thresholds    []float64
-	noiseFloor    float64
-	now           time.Time
+	allIQ      []complex64
+	iq         []complex64
+	spectrum   []float64
+	finished   []detector.Event
+	detected   []detector.Signal
+	thresholds []float64
+	noiseFloor float64
+	now        time.Time
 }
 
 func newDSPRuntime(cfg config.Config, det *detector.Detector, window []float64, gpuState *gpuStatus) *dspRuntime {
@@ -229,14 +229,25 @@ func (rt *dspRuntime) buildSurveillanceResult(art *spectrumArtifacts) pipeline.S
 	}
 }
 
-func (rt *dspRuntime) refineSignals(art *spectrumArtifacts, scheduled []pipeline.ScheduledCandidate, extractMgr *extractionManager, rec *recorder.Manager) pipeline.RefinementResult {
+func (rt *dspRuntime) buildRefinementInput(surv pipeline.SurveillanceResult) pipeline.RefinementInput {
+	return pipeline.RefinementInput{
+		Candidates: append([]pipeline.Candidate(nil), surv.Candidates...),
+		Scheduled:  append([]pipeline.ScheduledCandidate(nil), surv.Scheduled...),
+		SampleRate: rt.cfg.SampleRate,
+		FFTSize:    rt.cfg.FFTSize,
+		CenterHz:   rt.cfg.CenterHz,
+		Source:     "surveillance-detector",
+	}
+}
+
+func (rt *dspRuntime) refineSignals(art *spectrumArtifacts, input pipeline.RefinementInput, extractMgr *extractionManager, rec *recorder.Manager) pipeline.RefinementResult {
 	if art == nil || len(art.iq) == 0 {
 		return pipeline.RefinementResult{}
 	}
 	policy := pipeline.PolicyFromConfig(rt.cfg)
-	selectedCandidates := make([]pipeline.Candidate, 0, len(scheduled))
-	selectedSignals := make([]detector.Signal, 0, len(scheduled))
-	for _, sc := range scheduled {
+	selectedCandidates := make([]pipeline.Candidate, 0, len(input.Scheduled))
+	selectedSignals := make([]detector.Signal, 0, len(input.Scheduled))
+	for _, sc := range input.Scheduled {
 		selectedCandidates = append(selectedCandidates, sc.Candidate)
 		selectedSignals = append(selectedSignals, detector.Signal{
 			ID:       sc.Candidate.ID,
diff --git a/internal/pipeline/phases.go b/internal/pipeline/phases.go
index 2a044d2..2fcc9f9 100644
--- a/internal/pipeline/phases.go
+++ b/internal/pipeline/phases.go
@@ -11,8 +11,17 @@ type SurveillanceResult struct {
 	Thresholds []float64            `json:"thresholds,omitempty"`
 }
 
+type RefinementInput struct {
+	Candidates []Candidate          `json:"candidates,omitempty"`
+	Scheduled  []ScheduledCandidate `json:"scheduled,omitempty"`
+	SampleRate int                  `json:"sample_rate"`
+	FFTSize    int                  `json:"fft_size"`
+	CenterHz   float64              `json:"center_hz"`
+	Source     string               `json:"source,omitempty"`
+}
+
 type RefinementResult struct {
-	Signals    []detector.Signal   `json:"signals"`
-	Decisions  []SignalDecision    `json:"decisions,omitempty"`
-	Candidates []Candidate         `json:"candidates,omitempty"`
+	Signals    []detector.Signal `json:"signals"`
+	Decisions  []SignalDecision  `json:"decisions,omitempty"`
+	Candidates []Candidate       `json:"candidates,omitempty"`
 }
diff --git a/internal/pipeline/phases_test.go b/internal/pipeline/phases_test.go
index 141b6fb..44cf9f8 100644
--- a/internal/pipeline/phases_test.go
+++ b/internal/pipeline/phases_test.go
@@ -26,3 +26,20 @@ func TestSurveillanceResultCarriesScheduledCandidates(t *testing.T) {
 		t.Fatalf("unexpected surveillance result: %+v", res)
 	}
 }
+
+func TestRefinementInputCarriesScheduledCandidates(t *testing.T) {
+	res := RefinementInput{
+		Candidates: []Candidate{{ID: 2}},
+		Scheduled:  []ScheduledCandidate{{Candidate: Candidate{ID: 2}, Priority: 4}},
+		SampleRate: 2048000,
+		FFTSize:    2048,
+		CenterHz:   7.1e6,
+		Source:     "surveillance-detector",
+	}
+	if len(res.Candidates) != 1 || len(res.Scheduled) != 1 {
+		t.Fatalf("unexpected refinement input: %+v", res)
+	}
+	if res.SampleRate != 2048000 || res.FFTSize != 2048 || res.CenterHz != 7.1e6 {
+		t.Fatalf("unexpected refinement input fields: %+v", res)
+	}
+}