Browse Prior Art Database

Radar Antenna Testing

IP.com Disclosure Number: IPCOM000097898D
Original Publication Date: 1961-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Summers, WP: AUTHOR

Abstract

A sawtooth, modulating signal linearly shifts the frequency of oscillator 2 which excites the reference antenna 4 via wave guide 6. Signals are also sent via wave guide 8 to the test antenna location. The oscillator frequency is mixed with the signals 10 received by the test antenna 12 to produce a beat frequency in the detector 14.

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Radar Antenna Testing

A sawtooth, modulating signal linearly shifts the frequency of oscillator 2 which excites the reference antenna 4 via wave guide 6. Signals are also sent via wave guide 8 to the test antenna location. The oscillator frequency is mixed with the signals 10 received by the test antenna 12 to produce a beat frequency in the detector 14.

This frequency is proportional to the time delay between the wave guide 8 sample and the received signal 10. The low-pass filter 16 rejects all signals having a path length greater than the direct path by a predetermined amount.

The relationship of the lengths of wave guides 6 and 8, and the free space distance compensate for the difference in velocity of propagation via the two media. The attenuator 18 insures operation of the detectors on a desirable portion of their non-linear characteristic curves. The physical location of the diodes in the detector 14 eliminates the effects of interference pattern in the wave guide junction.

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