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1 School of Electrical Engineering Tel Aviv University Single Antenna Geo-location Based on Signal Structure Elad Tzoreff, Ben-Zion Bobrovsky, Anthony.

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Presentation on theme: "1 School of Electrical Engineering Tel Aviv University Single Antenna Geo-location Based on Signal Structure Elad Tzoreff, Ben-Zion Bobrovsky, Anthony."— Presentation transcript:

1 1 School of Electrical Engineering Tel Aviv University Single Antenna Geo-location Based on Signal Structure Elad Tzoreff, Ben-Zion Bobrovsky, Anthony J. Weiss (Free space Radio Signals)

2 2 School of Electrical Engineering Tel Aviv University Background: Common Geo-location methods  Direction of Arrival (DOA)  Time Difference of Arrival (TDOA)  Differential Doppler (DDOP)  Received Signal Strength (RSS)  Finger Printing  Combinations of the above

3 3 School of Electrical Engineering Tel Aviv University DOA RSS DDOP TDOA

4 4 School of Electrical Engineering Tel Aviv University Common Geo-location methods  Multiple sensors  Synchronization between sensors  Communication between sensors All these mean:  Complex system architecture  Expensive support systems Synch beacon sensors

5 5 School of Electrical Engineering Tel Aviv University We are interested in simplifying geo- location system, but how?

6 6 School of Electrical Engineering Tel Aviv University Observation  Most radars are periodic or at least predictable:

7 7 School of Electrical Engineering Tel Aviv University Digital Communication Signals  Communication Carrier is periodic  Communication symbols appear periodically  Communication synch frame appear periodically  Spreading code is periodic

8 8 School of Electrical Engineering Tel Aviv University Basic Idea and Advantages Use a single moving receiver for location  Low cost  Low weight  Easy to hide (small, passive, moving)  Simple to implement  No synch. between sites  No data link between sites  Can enhance existing system

9 9 School of Electrical Engineering Tel Aviv University Potential Platforms UAV UAV Localization shell

10 10 School of Electrical Engineering Tel Aviv University Localization Based on Signal Structure

11 11 School of Electrical Engineering Tel Aviv University TDOA Lines of Position

12 12 School of Electrical Engineering Tel Aviv University The LOPs Associated with DTOA

13 13 School of Electrical Engineering Tel Aviv University DDOP Lines of Position

14 14 School of Electrical Engineering Tel Aviv University LOPs Associated with DDOP

15 15 School of Electrical Engineering Tel Aviv University Potential Obstacles  Transmitter Oscillator instability  Receiver clock instability  Receiver Position inaccuracy  TDOA/DDOP measurements errors (Noise, BW, Multipath)  Transmitted signal is too short

16 16 School of Electrical Engineering Tel Aviv University Oscillator Imperfection Timing Errors

17 17 School of Electrical Engineering Tel Aviv University Oscillator Instability Timing error h = Random error intensity Voltage controlled Voltage controlled Temp. compensated Temp. compensated Oven compensated Oven compensated

18 18 School of Electrical Engineering Tel Aviv University Sensor trajectory 6 Km Signal period 10 ms Sensor speed 300 m/s Simulation Results

19 19 School of Electrical Engineering Tel Aviv University Heat Map straight trajectory

20 20 School of Electrical Engineering Tel Aviv University Heat Map Curved Trajectory

21 21 School of Electrical Engineering Tel Aviv University At High SNR Accuracy is Limited by Oscillator Instability

22 22 School of Electrical Engineering Tel Aviv University The Slower the Receiver Moved the Larger the error

23 23 School of Electrical Engineering Tel Aviv University For Good Oscillators the Accuracy is Determined by SNR

24 24 School of Electrical Engineering Tel Aviv University Thank you, Questions, Comments or remarks?

25 25 School of Electrical Engineering Tel Aviv University Direct Position Determination  The Common Approach is a 2 Step Procedure 1.Estimate parameters (TDOA, DDOP) 2.Estimate Location from first step results The Justifications: 1.Easier to understand. 2.less communication between stations!!! 3.Asymptotic equivalence: Extended Invariance Principle (EXIP: Stoica & Soderstrom 1989)

26 26 School of Electrical Engineering Tel Aviv University Common Approach for Location Estimation

27 27 School of Electrical Engineering Tel Aviv University Other Drawbacks

28 28 School of Electrical Engineering Tel Aviv University Direct Position Determination 1.Exact Maximum Likelihood 2.Simple 2D search (only 2 parameters are estimated) 3.No processing required at remote stations 4.Better accuracy at low SNR or interference 5.No association problem

29 29 School of Electrical Engineering Tel Aviv University The DPD Heat Map

30 30 School of Electrical Engineering Tel Aviv University Can we do better than DPD ?

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