INVESTIGATION OF ACTIVE DOPPLER VELOCITY SENSOR.
Abstract
Presented is a summary of the results of a study program directed toward the advancement of the state-of-the-art of Doppler navigation radar techniques to meet the requirements of a boost glide vehicle. The spectral compression tech nique was the principal subject of investigation, and effort was divided into the following areas: (1) development of a wide frequency deviation, highly linear, low noise, microwave, FM/CW trans mitter; (2) development of a Computer and Control Unit capable of automatic modulation slope control and Doppler frequency computation; (3) flight testing of the developed equipment; and (4) theoretical analysis in support of equipment development and of subjects relating to the physics of spectral compression. The investiga tion of spectral compression culminated in the successful flight demonstration of the technique in a B-26 aircraft. Spectral analysis showed that a direct increase in peak spectral density accompanied the bandwidth reduction. Compression ratios of 10:1 were achieved when viewed over the period of one second and even greater ratios (20 to 30:1) were achieved over several modula tion periods. The ability to redistribute the received energy over a narrower bandwidth will allow one to reduce the transmitter power re quirements below that required for unmodulated transmission. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 31, 1963
- Accession Number
- AD0426754
Entities
Organizations
- RTX