Experimental Evaluation of AoA Estimation for UAV to Massive MIMO

We completed a measurement campaign of the drone hovering at 20m over five locations. These locations are mapped using GPS locations from the Pixhawk flight controller used from the ASTRO drone platform:

• Base Station Coordinates: 29.716052834135827, -95.40833132959355
• Drone Loc. 1 [AZ Angle w.r.t BS -9.64]: 29.71587997076222, -95.40949629024838
• Drone Loc. 2 [AZ Angle w.r.t BS 10.20]: 29.716231223497598, -95.40946649704692
• Drone Loc. 3 [AZ Angle w.r.t BS 21.54]: 29.71641642334013, -95.40938623970409
• Drone Loc. 4 [AZ Angle w.r.t BS 32.49]: 29.71659056000551, -95.40929848482654
• Drone Loc. 5 [AZ Angle w.r.t BS 44.26]: 29.716750897595286, -95.40915175305562

Collection of the Massive MIMO data set missed three antennas. We zeroed out those locations within our dataset when processing allowing us to keep our spacing/structure (Test were done to understand the effects of this, where it was only a 1 to 2 degree range of error influenced).

Below are attributes of the RENEW-Argos V3 Massive-MIMO test bed.

• Base station: Argos V3 Massive-MIMO
• Signal Frequency: 3.6 GHz
• Wavelength: 8.327 cm
• Antenna spacing x (horizontal direction): 3.94 cm
• Antenna spacing y (vertical direction): 6.66 cm
• Sample Rate: 5 MHz
• Modulation: QPSK
• Array Size: 5 X 8
• BS Schedule: ‘BGPPGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGPPGG'
• Ref Node Schedule: ‘GGPPGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG’
• Drone Node Schedule: ‘GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGPPGG’
• Data Size: 2240x74x4x1x2001
• Polarity: 45degress & -45degress = (2240/2= 1120 samples)
• Number of antennas: 74 (74+6missing=80)
• Slot Pilot: Slot number from the schedule (order of sequence)
• Samples: 1120(x2)

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