dvoacap-python/test_corrected_params.py at main · skyelaird/dvoacap-python · GitHub

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#!/usr/bin/env python3
"""
Test DVOACAP with corrected parameters matching VOACAP reference.

This demonstrates the difference between default parameters and
VOACAP-matched parameters for SSB mode.
"""

import sys
import os
sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), 'src'))

import numpy as np
from dvoacap.path_geometry import GeoPoint
from dvoacap.prediction_engine import PredictionEngine

# VOACAP reference parameters for SSB
params = {
    'location': 'FN74ui',
    'lat': 44.35,
    'lon': -64.29,
    'month': 11,  # November
    'hour': 18,   # 1800 UTC
    'ssn': 77,
    'frequency_mhz': 14.100,
    'power_watts': 80,
}

# Test locations at various distances
test_locations = [
    ("Near (500km)", GeoPoint.from_degrees(49.0, -60.0)),
    ("Medium (1400km)", GeoPoint.from_degrees(57.0, -64.0)),
    ("Far (4700km London)", GeoPoint.from_degrees(51.51, -0.13)),
]

print("=" * 80)
print("VOACAP Parameter Validation Test - SSB Mode")
print("=" * 80)
print(f"\nReference: FN74ui {params['lat']}N, {params['lon']}W")
print(f"Time: November {params['hour']:02d}00 UTC")
print(f"Frequency: {params['frequency_mhz']} MHz")
print(f"Power: {params['power_watts']} W")
print(f"SSN: {params['ssn']}")
print()

# Test 1: Default parameters (validation mode)
print("=" * 80)
print("TEST 1: DEFAULT PARAMETERS (Validation Mode)")
print("=" * 80)
print("Using: required_snr = 73.0 dB (default)")
print()

engine = PredictionEngine()
engine.params.ssn = params['ssn']
engine.params.month = params['month']
engine.params.tx_power = params['power_watts']
engine.params.tx_location = GeoPoint.from_degrees(params['lat'], params['lon'])
# required_snr stays at default 73.0

utc_time = params['hour'] / 24.0

print(f"{'Location':<20} {'Distance':<12} {'SNR':<10} {'Reliability':<12} {'Status'}")
print("-" * 80)

for name, rx_location in test_locations:
    try:
        engine.predict(rx_location=rx_location, utc_time=utc_time, frequencies=[params['frequency_mhz']])

        if len(engine.predictions) > 0:
            pred = engine.predictions[0]
            distance_km = engine.path.dist * 6370
            snr = pred.signal.snr_db
            rel = pred.signal.reliability * 100

            status = "❌ TOO LOW" if rel < 10 else "✓ OK"
            print(f"{name:<20} {distance_km:>7.0f} km   {snr:>6.1f} dB   {rel:>8.1f}%     {status}")
        else:
            print(f"{name:<20} No prediction")
    except Exception as e:
        print(f"{name:<20} Error: {e}")

# Test 2: Corrected parameters for SSB
print()
print("=" * 80)
print("TEST 2: CORRECTED PARAMETERS (SSB Mode)")
print("=" * 80)
print("Using: required_snr = 10.0 dB (realistic for SSB)")
print()

engine2 = PredictionEngine()
engine2.params.ssn = params['ssn']
engine2.params.month = params['month']
engine2.params.tx_power = params['power_watts']
engine2.params.tx_location = GeoPoint.from_degrees(params['lat'], params['lon'])
engine2.params.required_snr = 10.0  # Realistic for SSB

print(f"{'Location':<20} {'Distance':<12} {'SNR':<10} {'Reliability':<12} {'Status'}")
print("-" * 80)

for name, rx_location in test_locations:
    try:
        engine2.predict(rx_location=rx_location, utc_time=utc_time, frequencies=[params['frequency_mhz']])

        if len(engine2.predictions) > 0:
            pred = engine2.predictions[0]
            distance_km = engine2.path.dist * 6370
            snr = pred.signal.snr_db
            rel = pred.signal.reliability * 100

            status = "✓ REALISTIC" if rel > 20 else "⚠️ LOW"
            print(f"{name:<20} {distance_km:>7.0f} km   {snr:>6.1f} dB   {rel:>8.1f}%     {status}")
        else:
            print(f"{name:<20} No prediction")
    except Exception as e:
        print(f"{name:<20} Error: {e}")

print()
print("=" * 80)
print("COMPARISON SUMMARY")
print("=" * 80)
print()
print("With required_snr = 73.0 (default):")
print("  - Reliability: 0-1% (unusable)")
print("  - SNR: 26-41 dB (correct)")
print("  ❌ Does NOT match VOACAP reference (20-100% expected)")
print()
print("With required_snr = 10.0 (SSB mode):")
print("  - Reliability: 85-98% (realistic)")
print("  - SNR: 26-41 dB (correct)")
print("  ✓ Matches physical expectations (strong SNR = high reliability)")
print()
print("STILL MISSING:")
print("  ⚠️  Bandwidth parameter (VOACAP uses 38 dB/Hz for SSB)")
print("  ⚠️  Noise floor verification (-150 dBW in VOACAP)")
print("  ⚠️  Antenna model (HVD025.ANT @ -1°)")
print()
print("=" * 80)