Defining Measurement Model

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The Measurement model configuration necessary for your Orbit Determination system depends on the type of Observations you are working with. For each Observation type, different observing objects or objects being observed will be used, as discussed on the Simulating Tracking Data page. The objects used by each Observation type, as well as the object properties that will affect the Observation, are shown in the table below.

 

Follow the links to each object type to learn more about how to edit the properties used by each Observation.

 

Observation Type

Objects Used

Corrections Used - Biases

Measurement Noise

BRTS observations

GroundAntenna

Two-way Range Bias
Two-way Doppler Bias

TimeTag Bias

Two-way Range Noise
Two-way Doppler Noise

TDRSTransponder

Transponder Delay

None

Ground Station observations[1]

GroundStation

Latitude Bias
Longitude Bias
Height Bias

None

GroundAntenna

Range Bias
Range Rate Bias
Azimuth Bias
Elevation Bias

Right Ascension Bias

Declination Bias
TimeTag Bias

Range Noise
Range Rate Noise
Azimuth Noise
Elevation Noise

Right Ascension Noise

Declination Noise

Transponder (optional)

Transponder Delay

None

DSN observations

GroundStation

Latitude Bias

Longitude Bias

Height Bias

None

GroundAntenna[2]

Range Bias

Range Rate Bias

TimeTag Bias

Range Noise

Range Rate Noise

Transponder (optional)

Transponder Delay

None

Point Solution observations

GPSReceiver

TimeTag Bias
X Bias
Y Bias
Z Bias
VX Bias
VY Bias
VZ Bias

X Noise
Y Noise
Z Noise
VX Noise
VY Noise
VZ Noise

Pseudorange observations

GPSReceiver

Clock Bias
Clock Drift

Receiver Noise

Spacecraft observations

Sensor

Range Bias
Range Rate Bias
Azimuth Bias
Elevation Bias

Right Ascension Bias

Declination Bias

TimeTag Bias

Range Noise
Range Rate Noise
Azimuth Noise
Elevation Noise

Right Ascension Noise

Declination Noise

Transponder (optional)

Transponder Delay

None

TDRS observations

GroundStation

Latitude Bias
Longitude Bias
Height Bias

None

GroundAntenna

Two-way Range Bias
Two-way Doppler Bias
One-way Doppler Bias

TimeTag Bias

Two-way Range Noise
Two-way Doppler Noise
One-way Doppler Noise

TDRSTransponder

Transponder Delay

None

Transponder (optional)

Transponder Delay

None

 

[1] Note: For Ground Station observations and DSN observations, different GroundAntennas can be specified for the transmitting and receiving stations to simulate "3-way" observations. See Simulating 3-way Observations for more information.

 

[2] Note: DSN observations are derived from Ground Station observations, and therefore have all the same biases and measurement noise options available. Because of the long range nature of DSN observations, angular data is not generally very informative, so Azimuth, Elevation, Right Ascension, and Declination measurements are not used by default, and therefore their associated biases/noises are not included in this table.