Ryan Malloy
5552bf3280
Implements 5 new C functions requested by the Craft (Astrolock) API team: - tle_from_lines(text, text): two-argument TLE constructor - observer_from_geodetic(float8, float8, float8): numeric observer constructor - observe(tle, observer, timestamptz): single-call propagate + topocentric - sgp4_propagate_safe(tle, timestamptz): returns NULL on propagation error - observe_safe(tle, observer, timestamptz): returns NULL on propagation error Refactors do_propagate() into safe/unsafe variants to support NULL returns. Adds regression test (convenience.sql) covering all new functions including an equivalence test verifying observe() matches the manual two-step pipeline. All 6 regression tests pass.
109 lines
3.4 KiB
Plaintext
109 lines
3.4 KiB
Plaintext
-- convenience functions requested by Craft (Astrolock) integration
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CREATE EXTENSION IF NOT EXISTS pg_orbit;
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NOTICE: extension "pg_orbit" already exists, skipping
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-- tle_from_lines: two-argument constructor
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SELECT tle_norad_id(tle_from_lines(
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'1 25544U 98067A 24001.50000000 .00016717 00000-0 10270-3 0 9002',
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'2 25544 51.6400 208.5000 0007417 68.5000 291.5000 15.49560000100001'
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)) AS iss_norad_id;
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iss_norad_id
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--------------
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25544
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(1 row)
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-- observer_from_geodetic: numeric constructor
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SELECT observer_from_geodetic(40.0, -105.3, 1655);
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observer_from_geodetic
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--------------------------
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40.0000N 105.3000W 1655m
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(1 row)
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-- observer_from_geodetic: default altitude = 0
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SELECT observer_from_geodetic(40.0, -105.3);
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observer_from_geodetic
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------------------------
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40.0000N 105.3000W 0m
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(1 row)
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-- sgp4_propagate_safe: normal propagation returns result
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SELECT (sgp4_propagate_safe(
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'1 25544U 98067A 24001.50000000 .00016717 00000-0 10270-3 0 9002
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2 25544 51.6400 208.5000 0007417 68.5000 291.5000 15.49560000100001'::tle,
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'2024-01-01 12:00:00+00'::timestamptz
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) IS NOT NULL) AS safe_returns_result;
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safe_returns_result
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---------------------
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t
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(1 row)
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-- sgp4_propagate_safe: diverged orbit returns NULL
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SELECT sgp4_propagate_safe(
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'1 25544U 98067A 24001.50000000 .00016717 00000-0 10270-3 0 9002
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2 25544 51.6400 208.5000 0007417 68.5000 291.5000 15.49560000100001'::tle,
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'2124-01-01 12:00:00+00'::timestamptz
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) IS NULL AS safe_null_on_diverge;
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safe_null_on_diverge
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----------------------
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t
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(1 row)
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-- observe: single-call propagate + topocentric
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SELECT observe(
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'1 25544U 98067A 24001.50000000 .00016717 00000-0 10270-3 0 9002
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2 25544 51.6400 208.5000 0007417 68.5000 291.5000 15.49560000100001'::tle,
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observer_from_geodetic(40.0, -105.3, 1655),
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'2024-01-01 12:00:00+00'::timestamptz
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);
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observe
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----------------------------------------
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(134.5927,-21.2008,5580.842,-2.373498)
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(1 row)
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-- observe_safe: returns NULL on diverged orbit
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SELECT observe_safe(
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'1 25544U 98067A 24001.50000000 .00016717 00000-0 10270-3 0 9002
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2 25544 51.6400 208.5000 0007417 68.5000 291.5000 15.49560000100001'::tle,
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'40.0N 105.3W 1655m'::observer,
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'2124-01-01 12:00:00+00'::timestamptz
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) IS NULL AS observe_safe_null;
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observe_safe_null
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-------------------
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t
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(1 row)
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-- observe matches manual eci_to_topocentric pipeline
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-- (verify observe() produces same result as the two-step approach)
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WITH propagated AS (
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SELECT sgp4_propagate(
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'1 25544U 98067A 24001.50000000 .00016717 00000-0 10270-3 0 9002
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2 25544 51.6400 208.5000 0007417 68.5000 291.5000 15.49560000100001'::tle,
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'2024-01-01 12:00:00+00'::timestamptz
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) AS eci
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),
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manual AS (
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SELECT eci_to_topocentric(
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eci,
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'40.0N 105.3W 1655m'::observer,
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'2024-01-01 12:00:00+00'::timestamptz
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) AS topo
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FROM propagated
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),
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single_call AS (
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SELECT observe(
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'1 25544U 98067A 24001.50000000 .00016717 00000-0 10270-3 0 9002
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2 25544 51.6400 208.5000 0007417 68.5000 291.5000 15.49560000100001'::tle,
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'40.0N 105.3W 1655m'::observer,
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'2024-01-01 12:00:00+00'::timestamptz
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) AS topo
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)
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SELECT
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topo_azimuth(m.topo) = topo_azimuth(s.topo) AS az_match,
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topo_elevation(m.topo) = topo_elevation(s.topo) AS el_match,
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topo_range(m.topo) = topo_range(s.topo) AS range_match
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FROM manual m, single_call s;
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az_match | el_match | range_match
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----------+----------+-------------
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t | t | t
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(1 row)
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