Kohärentes Radarhöhenmess-System

A pulsed coherent radar altimeter employs a narrow band receiver (28, 32, 34, 36, 38, 42, 44) and utilizes a novel digital coherent pulse generator (52, 54, 56, 58, 65). The radar transmits a pulse comprised of the sum of at least two phase related RF signals closely spaced in frequency. The phase s...

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Bibliographische Detailangaben
Hauptverfasser:	THUE, BAARD H., LINO LAKES, MN 55014, US, BJORKE, MERLIN D., MINNEAPOLIS, MN 55418, US
Format:	Patent
Sprache:	ger
Schlagworte:	ANALOGOUS ARRANGEMENTS USING OTHER WAVES DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING PHYSICS RADIO DIRECTION-FINDING RADIO NAVIGATION TESTING
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Beschreibung
Zusammenfassung:	A pulsed coherent radar altimeter employs a narrow band receiver (28, 32, 34, 36, 38, 42, 44) and utilizes a novel digital coherent pulse generator (52, 54, 56, 58, 65). The radar transmits a pulse comprised of the sum of at least two phase related RF signals closely spaced in frequency. The phase shift due to platform motion and return surface irregularity of the return signal is approximately the same for each carrier. The receiver produces a signal representative of the difference of the two carriers which is substantially free of decorrelation effects, and which can be processed to produce range information (Fig. 1).