## 35 A Method to Locate Airborne Radar Observation Data

Monday, 28 August 2017
Zurich DEFG (Swissotel Chicago)
Shubei Wang, Chengdu Univ. of Information Technology, Chengdu, China; and Z. Yao
Manuscript (666.2 kB)

Handout (4.2 MB)

First of all, scanning strategy of the airborne weather radar was analyzed, and the location problems involved in radar observation data processing according to observational process are illustrated clearly, namely the coordinate system for observation and data processing is not consistent. Using the coordinate transformation technique to find the actual location of the radar observation data and put all data information into the same coordinate system.
Secondly, aiming at the problem of locating observation data, this paper analyzes the detection process and clarified relations in relevant spatial locations. The homogeneous coordinate method is used to accomplish the transformation of data coordinate. In order to put the data in the same coordinate system, the intermediate coordinate systems are presented. Then, the process in detail from radar coordinate system to geodetic coordinate system is analyzed, and the location algorithm of data detected by airborne radar is put forward.
Finally, using the observation data measured by HIWRAP to make simulation and analysis according to the detection process and map the location result. Subsequently, the problem of long time-consuming as well as the position error in this algorithm are analyzed. For the former problem, a method of reducing the dimension matrix is presented to decrease the computing time. For the latter, the larger error in the location caused by the data nonlinear transformation from the space rectangular coordinate system to the geodetic coordinate system. Consequently, the method transformed from space rectangular coordinate into geodetic coordinate system is discussed , and making a comparison in the direct and iterative method. Through the simulation and analysis find that using the iterative algorithm to accomplish coordinate transformation is more accurate than direct algorithm, and less number of iteration can achieve higher accuracy.

transformation formulation:G=Q8-1Q7-1Q6-1Q5-1Q4-1Q3-1Q2-1Q1-1F

where，F is a matrix represented the coordinate under radar coordinate system, it consist of range from radar,rotation angle and incidence angle.

Q1 is a transformation matrix transformed data coordinates from aircraft coordinate system to radar coordinate system, it includes the spatial position of origin of radar coordinate system relative to the spatial position of aircraft particle.

Q2Q3Q4 are transformation matrix transformed data coordinates from aircraft intermediate coordinate system to aircraft coordinate system, it includes the aircraft attitude parameters( roll angle,pitch angle,track angle and heading).

Q5Q6Q7Q8are transformation matrix transformed data coordinates from space rectangular coordinate system to aircraft intermediate coordinate system, it includes GPS information(aircraft latitude, longitude and altitude) and geometric parameters of the ellipsoid model based on earth.

G is a matrix represented the observation data coordinate under geodetic coordinate system.

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