RF channel calibration for non-linear FM waveforms

Details RF channel calibration for non-linear FM waveforms RF channel calibration for non-linear FM waveforms

2006-03-28

2006-03-28

Lobo, Ian J. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Testing or calibrating of radar system

By monitoring

C342S165000, C342S204000

Reexamination Certificate

active

07019686

ABSTRACT:
A system, method, and computer program product that performs self-calibration of pulse-compression radar signals. The system includes an antenna, a receiver, a transmitter, and a radar signal processor. Under normal (non-calibration) operation the radar transmitter generates a pulse compression waveform and transmits it via the antenna. Any reflections from this waveform are detected by the same antenna and processed by the receiver. The received radar signal then undergoes pulse compression followed by more mode-specific processing (windshear, weather, ground map, etc.) by the radar processor. During calibration, the radar transmitter generates a similar pulse compression waveform (i.e., calibration pulses), but the calibration pulses bypass the antenna and go directly to the receiver via a “calibration path” built into the hardware. The resulting calibration pulses are used to generate a calibration filter. The calibration filter is applied to the received radar signals in the frequency domain either before or after pulse compression.

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Green R A et al.; Considerations for quadrature receiver calibration using frequency weighed least squares FIR filter design; 2002 IEEE International Symposium on Electomagnetic Compatibility; Minneapolis, MN; Aug. 19-23, 2002.
Rostan F; The calibration of the MetOp/Advanced scattermeter(ASCAT); Institute of Electrical and Electronics Engineers; IEEE 2000 International Geoscience and Remote Sensing Symposium; Honolulu, Hawaii; Jul. 24-28, 2000.

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