Commit b34d3f00 authored by Bryan Cazabonne's avatar Bryan Cazabonne
Browse files

Updated documentation with addition of Brouwer-Lyddane model.

parent 1cb71bfd
......@@ -76,6 +76,7 @@
AbstractAnalyticalPropagator <|-- AdapterPropagator
AbstractAnalyticalPropagator <|-- EcksteinHechlerPropagator
AbstractAnalyticalPropagator <|-- KeplerianPropagator
AbstractAnalyticalPropagator <|-- BrouwerLyddanePropagator
AbstractAnalyticalPropagator <|-- Ephemeris
BoundedPropagator <|.. Ephemeris
......@@ -57,6 +57,7 @@
class KeplerianPropagatorBuilder
class TLEPropagatorBuilder
class EcksteinHechlerPropagatorBuilder
class BrouwerLyddanePropagatorBuilder
interface PropagatorConverter {
+Propagator convert(Propagator source, double timeSpan, int nbPoints, Collection<String> freeParameters)
......@@ -87,6 +88,7 @@
PropagatorBuilder <|.. KeplerianPropagatorBuilder
PropagatorBuilder <|.. TLEPropagatorBuilder
PropagatorBuilder <|.. DSSTPropagatorBuilder
PropagatorBuilder <|.. BrouwerLyddanePropagatorBuilder
PropagatorBuilder <|.right. EcksteinHechlerPropagatorBuilder
PropagatorConverter <|.. AbstractPropagatorConverter
......@@ -280,6 +280,19 @@ If users need a more definitive initialization of an Eckstein-Hechler propagator
should consider using a propagator converter to initialize their Eckstein-Hechler
propagator using a complete sample instead of just a single initial orbit.
### Brouwer-Lyddane propagation
At the opposite of the Eckstein-Hechler model, the Brouwer-Lyddane model is
suited for elliptical orbits. In other words, there is no problem having a small
(or big) eccentricity or inclination. Lyddane helped to solve this issue with
the Brouwer model by summing the long and short periodic variations of the mean anomaly
with the ones of the argument of perigee. One needs still to be careful with
eccentricities lower than 5e-4. For singularity reason, the computation should not
be done for the critical inclination : 63.4°.
The Brouwer-Lyddane model considers J2 to J5 potential zonal coefficients, and uses the
mean and short periodic variation of the keplerian elements to compute the position.
### GNSS propagation
There are several dedicated models used for GNSS constellations propagation. These
......@@ -77,6 +77,7 @@
* analytical propagation models
* Kepler
* Eckstein-Heschler
* Brouwer-Lyddane
* SDP4/SGP4 with 2006 corrections
* GNSS: GPS, QZSS, Galileo, GLONASS, Beidou, IRNSS and SBAS
* numerical propagators
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