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AWR1642: In different PROFILE_SRR_START_FREQ_GHZ, why the angle is different

Part Number: AWR1642

Hello,

I put a corner in a chamber to measure the angle by radar(SRR).

(#define PROFILE_SRR_LAMBDA_MILLIMETER       (MMWDEMO_SPEED_OF_LIGHT_IN_METERS_PER_USEC/PROFILE_SRR_START_FREQ_GHZ))

When I use 

#define PROFILE_SRR_START_FREQ_GHZ          (76.01f)

the SRR measure the angle is -1.x

but I use 

#define PROFILE_SRR_START_FREQ_GHZ          (77.01f)

the SRR measure the angle is -3.x

 

I don't know why? Whether some setting not correctly modify?

Thanks