Accession Number : ADA331131

Title :   Air/Surface Channel Isolation in the AN/SPQ-9B Radar: Diplexer Test Results.

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC SIGNAL PROCESSING SECTION/ADVANCED RADAR SYSTEM

Personal Author(s) : Tavik, Gregory C. ; Cantrell, Ben ; Livingston, Michael D.

PDF Url : ADA331131

Report Date : 30 SEP 1997

Pagination or Media Count : 16

Abstract : A method for reducing cross-talk interference generated on receive between the Air and Surface Channels of the AN/SPQ-9B radar is described. The method utilizes a diplexer circuit that is placed prior to a transmitlreceive limiter cFRL) for each channel so that the Air and Surface Channel echoes, which are transmitted on different frequencies, are processed by two completely separate receiver chains. In this way, strong clutter echoes passing through front end components that are near saturation in one channel will not generate inter-modulation tones which could appear in the other channel's passband. Results of this method tested with NRiJs ANISPQ-9B advanced development model (ADM) radar show a 10 to 30 dB reduction of cross-talk generated on receive due to strong clutter echoes at close range.

Descriptors :   *RADAR, *AIR TO SURFACE, *CROSSTALK, ISOLATION, SATURATION, SURFACES, FREQUENCY BANDS, ECHOES, CHAINS, RECEIVERS, INTERFERENCE, SHORT RANGE(DISTANCE), CIRCUITS, RADAR CLUTTER, INTERMODULATION, CHANNELS, AUDIO TONES, DIPLEXERS.

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE