SDRDF

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Introduction

Software Defined Radio Direction Finding

Video

http://www.youtube.com/watch?v=NSC4Y8yA-jY

Theory

Measure phase difference of pseudo-doppler signal introduced by electronically rotating antenna array against a reference signal of the same frequency as the switching rate.

Implementation

Antenna clock must be in lock-step with reference signal on computer.

SDR allows for same clock to be used to drive array, as that which is being used as external time reference for software DSP.

USRP

Modify firmware to output switching signal directly from FPGA. Same clock is used to time samples to computer, so a software signal source can be used as reference (orientation requires phase calibration).

References

Google Books

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Software Defined Radio Direction Finding
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