Simulation of post-ADC digital beam-forming for large area radar receiver arrays
In order to provide instantaneous three-dimensional radar measurements spanning the entire vertical extent of the ionosphere, the planned EISCAT 3D incoherent scatter radar system includes multiple receive-only antenna arrays, situated at 90-280 km from the main transmit/receive site. These will emp...
| Published in: | 2006 International RF and Microwave Conference |
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| Main Authors: | , , , |
| Format: | Conference Object |
| Language: | English |
| Published: |
Luleå tekniska universitet, EISLAB
2007
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| Subjects: | |
| Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-30106 https://doi.org/10.1109/RFM.2006.331084 |
| Summary: | In order to provide instantaneous three-dimensional radar measurements spanning the entire vertical extent of the ionosphere, the planned EISCAT 3D incoherent scatter radar system includes multiple receive-only antenna arrays, situated at 90-280 km from the main transmit/receive site. These will employ band-pass sampling at ∼80 MHz, with the input signal spectrum contained in the 6th Nyqvist zone. This paper presents simulations and methods used to investigate use of a post-ADC fractional-sample-delay (FSD) system necessary to perform true time-delay beamforming. To test the feasibility and limitations of the system an extensive simulation tool has been developed. The simulation system is implemented in matlab to provide cross-platform compatibility and can be applied to any similar system. Performance degrading aspects such as noise, jitter, bandwidth and resolution can be included in the simulations. The use of FIR-filters in the base-band of a band-pass sampled signal to apply true time-delay beam-forming is shown to be feasible. Godkänd; 2007; 20061229 (ysko) EISCAT 3D |
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