Radar altimeter with self-calibration feature

Details Radar altimeter with self-calibration feature Radar altimeter with self-calibration feature

1991-05-20

1992-11-03

Swann, Tod

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

Testing or calibrating of radar system

By monitoring

342120, 367902, G01S 740

Patent

active

051609339

ABSTRACT:
A radar altimeter incorporates circuitry for automatically adjusting altitude readings for variations caused by altitude and temperature changes. Normal target tracking of the radar is intermittently interrupted and a calibration sequence is interjected. The current altitude and receiver AGC information at the time of each interruption is temporarily stored and a test is initiated in which a pseudo radar return at that altitude is introduced to the receiver. The receiver operates on the pseudo return as it would on an actual return. The transmit power is adjusted automatically for the correct signal level at the tracker. The resultant altitude measured for the pseudo return is compared to a known test altitude and any difference is stored away as a correction factor to be applied to the altitude reading which had been stored at the time that its operation had been interrupted to perform the calibration test.

REFERENCES:
patent: 3309703 (1967-03-01), Ammon et al.
patent: 3544996 (1970-12-01), Pile
patent: 3588899 (1971-06-01), Strauch
patent: 4053890 (1977-10-01), Woodson, III et al.
patent: 4106020 (1978-08-01), Johnson
patent: 4435712 (1984-03-01), Kipp
patent: 4538150 (1985-08-01), Bone, Jr.
patent: 5047779 (1991-09-01), Hager

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