fr.cnes.sirius.patrius.assembly.models

Class RFLinkBudgetModel

java.lang.Object

fr.cnes.sirius.patrius.assembly.models.RFLinkBudgetModel

All Implemented Interfaces:

Serializable

public class RFLinkBudgetModel
extends Object
implements Serializable

This class contains the algorithm to compute the link budget knowing the satellite transmitter and ground receiver parameters.
The link budget is the accounting of all of the gains and losses from the transmitter (the satellite), through the medium to the receiver (the ground station).

Since:

1.2

Version:

$Id$

Author:

Tiziana Sabatini

See Also:

RFVisibilityDetector, RFAntennaProperty, Serialized Form

Concurrency :

immutable

Field Summary

Fields

Modifier and Type	Field and Description
static double	KDB Boltzmann constant [dBW / Hz / K].

Constructor Summary

Constructors

Constructor and Description
RFLinkBudgetModel(RFStationAntenna groundAntenna, Assembly satellite, String satelliteAntennaPart) Constructor for the link budget model.

Method Summary

Modifier and Type	Method and Description
double	computeLinkBudget(AbsoluteDate date) Computes the link budget at a given date.
double	computeLinkBudget(AbsoluteDate emitterDate, AbsoluteDate receiverDate) Computes the link budget at a given date.
RFStationAntenna	getReceiver() Returns the receiver (ground antenna).
Assembly	getSatellite()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

KDB

public static final double KDB

Boltzmann constant [dBW / Hz / K].

See Also:

Constant Field Values

Constructor Detail

RFLinkBudgetModel

public RFLinkBudgetModel(RFStationAntenna groundAntenna,
                         Assembly satellite,
                         String satelliteAntennaPart)

Constructor for the link budget model.

Parameters:

groundAntenna - the ground station antenna

satellite - the satellite assembly

satelliteAntennaPart - the name of the satellite antenna part in the assembly

Method Detail

computeLinkBudget

public final double computeLinkBudget(AbsoluteDate date)
                               throws PatriusException

Computes the link budget at a given date. Warning : in the terms used for link budget computation, the elliptic losses and the elliptic factor are converted in dB using 20log(...) and not 10log(...).

Parameters:

date - the spacecraft date of the link budget computation.

Returns:

the link budget

Throws:

PatriusException - when computing the ground receiver coordinates.

computeLinkBudget

public final double computeLinkBudget(AbsoluteDate emitterDate,
                                      AbsoluteDate receiverDate)
                               throws PatriusException

Computes the link budget at a given date. Emitter and receiver date can be different if propagation time is taken into account Warning : in the terms used for link budget computation, the elliptic losses and the elliptic factor are converted in dB using 20log(...) and not 10log(...).

Parameters:

emitterDate - the spacecraft emission date of the link budget computation.

receiverDate - the ground antenna reception date of the link budget computation.

Returns:

the link budget

Throws:

PatriusException - when computing the ground receiver coordinates.

getSatellite

public final Assembly getSatellite()

Returns:

the assembly representing the satellite

getReceiver

public RFStationAntenna getReceiver()

Returns the receiver (ground antenna).

Returns:

the receiver