| dc.contributor |
Kehtarnavaz , Nasser |
|
| dc.contributor |
Junkins , John L . |
|
| dc.creator |
Gunnam , Kiran Kumar |
|
| dc.date |
2004 -09 -30T01 :40 :12Z |
|
| dc.date |
2004 -09 -30T01 :40 :12Z |
|
| dc.date |
2003 -05 |
|
| dc.date |
2004 -09 -30T01 :40 :12Z |
|
| dc.date.accessioned |
2013 -03 -12T17 :36 :18Z |
|
| dc.date.available |
2013 -03 -12T17 :36 :18Z |
|
| dc.date.issued |
2013 -03 -12 |
|
| dc.identifier |
http : / /hdl .handle .net /1969 .1 /13 |
|
| dc.identifier.uri |
http : / /hdl .handle .net /1969 .1 /13 |
|
| dc.description |
Spacecraft missions such as spacecraft docking and formation flying require high precision relative position and attitude data . Although Global Positioining Systems can provide this capability near the earth , deep space missions require the use of alternative technologies . One such technology is the vision -based navigation (VISNAV ) sensor system developed at Texas A &M University . VISNAV comprises an electro -optical sensor combined with light sources or beacons . This patented sensor has an analog detector in the focal plane with a rise time of a few microseconds . Accuracies better than one part in 2000 of the field of view have been obtained . This research presents a new approach involving simultaneous activation of beacons with frequency division multiplexing as part of the VISNAV sensor system . In addition , it discusses the synchronous demodulation process using digital heterodyning and decimating filter banks on a low -power fixed point DSP , which improves the accuracy of the sensor measurements and the reliability of the system . This research also presents an optimal and computationally efficient six -degree -of -freedom estimation algorithm using a new measurement model based on the attitude representation of Modified Rodrigues Parameters . |
|
| dc.format |
564372 bytes |
|
| dc.format |
80960 bytes |
|
| dc.format |
electronic |
|
| dc.format |
application /pdf |
|
| dc.format |
text /plain |
|
| dc.format |
born digital |
|
| dc.language |
en _US |
|
| dc.publisher |
Texas A &M University |
|
| dc.subject |
Active beacons |
|
| dc.subject |
decimating filter bank |
|
| dc.subject |
digital signal processor (DSP ) |
|
| dc.subject |
frequency division multiplexing (FDM ) |
|
| dc.subject |
Gaussian least squares differential correction (GLSDC ) |
|
| dc.subject |
modified Rodrigues parameters (MRPs ) |
|
| dc.subject |
noncontact optoelectronic sensor |
|
| dc.subject |
positioning system |
|
| dc.subject |
precision navigation |
|
| dc.subject |
position sensitive diode (PSD ) sensor |
|
| dc.subject |
six -degrees -of -freedom (6DOF ) estimation |
|
| dc.subject |
spacecraft docking |
|
| dc.subject |
synchronous demodulation |
|
| dc.subject |
vision -based navigation (VISNAV ) . |
|
| dc.title |
A DSP embedded optical naviagtion system |
|
| dc.type |
Book |
|
| dc.type |
Thesis |
|
| dc.type |
Electronic Thesis |
|
| dc.type |
text |
|