Airborne Rain Mapping Radar


(last update: Feb 7, 1997)

JPL has developed the airborne rain-mapping radar ARMAR to help study the problems that will be faced by the space-borne TRMM precipitation radar. The following table summarizes the characteristics of both systems:

                                  ARMAR         TRMM

Frequency                        13.8 GHz      13.8 GHz
Nominal Altitude                 12.0 km      350.0 km
Scanning swath                    9.0 km      220.0 km
Surface horizontal resolution     0.8 km        4.0 km
Range resolution                 80.0 m       250.0 m
Signal type                       Chirp          CW
Peak power                      200.0 W       600.0 W
Polarization(s)                HH,VV,HV,VH       VV   
The similarities between ARMAR and TRMM include: ARMAR's additional capabilities include:
ARMAR was field-tested in a ground-based configuration during several occasions in 1991-92, and was flight-tested on the NASA DC-8 aircraft in May and December of 1992. These tests confirmed that the radar did meet design specifications. In particular, the use of time-domain weighting of the transmitted chirp achieves a remarkable range sidelobe level of -55 dB or better.

ARMAR has been used:

To retrieve a copy of the 1994 J.Tech. paper describing ARMAR: To retrieve a copy of the pre-print describing ARMAR's observations of the melting layer during TOGA-COARE:

For further info email sdurden@jpl.nasa.gov

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