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This paper presents a model for the absolute calibration of spaceborne doppler radars constituting an important contribution to the development of the doppler-radar altimeter for measuring the height of an obstacle, such as the sea. This paper develops and tests a method of absolute calibration based upon a viscycled nuclear radiometer, which uses an argon-helium-neon mixture as its working gas. The gas mixture is separated into optically thin and optically thick portions by passing the mixture through a single-cell gas-filled cylindrical chamber of finite length. The optically thick portion of the gas is located in the chamber's wall opposite the nuclear detector, and provides a means of transferring the calibrated component of the electrical power of the nuclear power to the detector. The relative accuracy of the calibrated part of the power is estimated at the 0.02 percent level for the test apparatus, in which the effects of scattering and absorption by the gas are negligible. A feasibility study was also made to consider the potential for measuring the height of an obstacle, such as a ship, from the sea surface to a depth comparable to that of the towing cable. Potential applications to the measurement of the seabed tilt at the 1000-meter level are discussed.
An automated process is presented for determining the power calibration of a liquid-eutectic radiometer housed in a mechanical enclosure. The calibration method is based upon a set of measurements of the liquid-level as a function of the current exiting the unit's three-phase power supply, together with estimates of the resistance of the electrical connections required in the electrical measurement. The leakage of power to the surrounding hardware is determined separately by measurement of the liquid-level in a test specimen of known volume and temperature. The leakage is applied in an iterative process to determine the calibration constant. The process takes approximately 10 minutes to complete, and provides a calibration constant with a precision in excess of 0.005 percent. The estimated uncertainty of the method is 2 percent, and is considered to be affected primarily by that of the measurement of the liquid level in the power enclosure, and by the amount of leakage. Results of two separate liquid-eutectic radiometer calibrations are presented, in which the leakage error was approximately 2 percent, and the liquid level measurement error was approximately 4.5 percent. d2c66b5586