Communications: directive radio wave systems and devices (e.g. – Testing or calibrating of radar system
Patent
1998-10-15
1999-10-19
Pihulic, Daniel T.
Communications: directive radio wave systems and devices (e.g.,
Testing or calibrating of radar system
342194, 342 70, G01S 1300
Patent
active
059696672
ABSTRACT:
A leakage calibration and removal system and method estimates the complex in-phase and quadrature phase (I/Q) components of a leakage signal for each beam location in the sampled down-converted radar signal in a radar system (10). In a digital embodiment, the stored leakage calibration signal (264) is subtracted (206) from the sampled radar signal, and the resultant signal is processed (208, 210, 212) to detect targets. A leakage calibration process (250) is activated if a leakage signal test (214) indicates a problem for a sufficient number of consecutive scans (216), wherein for each beam location, M consecutive I/Q waveforms are averaged (252), known targets are removed (254, 256, 258), and the resulting signal is scaled (262) and stored (264) as a new leakage calibration signal if the variance is within acceptable limits (262). In a hybrid embodiment, the stored leakage signal (364) is converted to analog form (366), subtracted (301) from the analog down-converted radar signal (300), and scaled by a variable gain (303) before the complex I/Q components are sampled therefrom (302, 304). A leakage calibration process (350) is activated every Nth scan (316), wherein for each beam location, M chirp waveforms are averaged (352) and checked for variance (354). If the variance is within acceptable limits, the leakage signal is updated by a Kalman Filter (356), stored as the new leakage calibration signal (364), and the Kalman gain matrices are updated (358).
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Farmer Michael E.
Jacobs Craig S.
Automotive Systems Laboratory Inc.
Pihulic Daniel T.
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