Limitations on reflector antenna gain by random surface errors, pointing errors, and the angle-of-arrival jitter

1990 ◽  
Vol 38 (1) ◽  
pp. 117-121 ◽  
Author(s):  
M. Safak
Keyword(s):  
Reflector Antenna ◽  
Antenna Gain ◽  
Angle Of Arrival ◽  
Random Surface ◽  
Surface Errors ◽  
Pointing Errors

Crosspolarisation properties of reflector antennas with random surface errors

1983 ◽  
Vol 19 (2) ◽  
pp. 49 ◽  
Author(s):  
J.M.M. Vissers ◽  
M.H.A.J. Herben ◽  
E.J. Maanders
Keyword(s):  
Reflector Antennas ◽  
Random Surface ◽  
Surface Errors

Enhancing sensitivity for emitter geolocation

2012 ◽  
Vol 4 (2) ◽  
pp. 129-135 ◽  
Author(s):  
Göran Tengstrand ◽  
Peter Hultman ◽  
Jean-François Grandin ◽  
Dario Benvenuti ◽  
Börje Andersson ◽  
...  
Keyword(s):  
Signal Processing ◽  
High Accuracy ◽  
Search Pattern ◽  
Low Latency ◽  
Time Of Arrival ◽  
Antenna Gain ◽  
Sufficient Data ◽  
Angle Of Arrival ◽  
Data Link ◽  
Very High

Angle of arrival (AOA), time of arrival (TOA), and frequency of arrival (FOA) can be measured for a signal from multiple platforms. By combining such measurements it is possible to obtain high-accuracy emitter position estimates. This requires a data link with low latency and sufficient data-rate, and synchronization of the platforms in space, time, and search pattern. Typically several of the platforms will have to make their measurements in the radar sidelobes that require very high receiver sensitivity. This paper focuses on discussing how the sensitivity can be improved using antenna gain or signal processing.

scholarly journals EFFECT OF ANTENNA POINTING ERRORS ON SAR IMAGING CONSIDERING THE CHANGE OF THE POINT TARGET LOCATION

2018 ◽  
Vol IV-3 ◽  
pp. 267-271
Author(s):  
Xin Zhang ◽  
Shijie Liu ◽  
Haifeng Yu ◽  
Xiaohua Tong ◽  
Guoman Huang
Keyword(s):  
Target Location ◽  
Original Data ◽  
Antenna Gain ◽  
Simulation Experiments ◽  
Pointing Error ◽  
Pointing Errors ◽  
Point Target ◽  
Sar Imaging ◽  
Internal Mechanism ◽  
The Stability

Towards spaceborne spotlight SAR, the antenna is regulated by the SAR system with specific regularity, so the shaking of the internal mechanism is inevitable. Moreover, external environment also has an effect on the stability of SAR platform. Both of them will cause the jitter of the SAR platform attitude. The platform attitude instability will introduce antenna pointing error on both the azimuth and range directions, and influence the acquisition of SAR original data and ultimate imaging quality. In this paper, the relations between the antenna pointing errors and the three-axis attitude errors are deduced, then the relations between spaceborne spotlight SAR imaging of the point target and antenna pointing errors are analysed based on the paired echo theory, meanwhile, the change of the azimuth antenna gain is considered as the spotlight SAR platform moves ahead. The simulation experiments manifest the effects on spotlight SAR imaging caused by antenna pointing errors are related to the target location, that is, the pointing errors of the antenna beam will severely influence the area far away from the scene centre of azimuth direction in the illuminated scene.

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