Puzzled about the description of MagPhase in 6.18.12.7 IQ sampling.

[Sun_X]

In the specification of  6.18.12.7 IQ sampling，The description  of magnitude and  phase .

I dont understand about magnitude  equals 1.646756*sqrt(I^2+Q^2) ,Why about 1.646756.

I dont understand about phase equals 64*atan2(Q, I) in the range [-201,201] ,Why about 64,And Why the range is [-201,201] .

Looking forward to your answer.

[ketiljo]

The Direction finding feature employs fixed-point arithmetic.

The factor of 1.646756 is an artefact of the fixed-point calculation. Only relative amplitudes between antennas are necessary for direction finding, so this factor can be ignored.

The range of atan2 is [-pi,pi]. Multiplied by 64 this is [-201.06,201.06]. The output is only whole integers, limiting the range to -201 to 201 with a resolution of 0.895 degrees.