Final Acceptance Testing of the Texas Instruments (TI) ASR-8/MTD (AN/GPN-25) at Tolicha Peak, Nevada.
Abstract
The measured operational SCV for channel A was 41.54 dB with 90-percent confidence limits of 41.03 and 42.17 dB. The corresponding SCV for channel B was 40.81 dB with 90-percent confidence limits of 40.31 and 41.35 dB. The SCV channel A was measured with a Doppler offset of 634 Hz. This offset placed the test signal at the peak of filter 4 for the 1266 PRF and at the peak of filter 5 for the 1050 PRF. The channel B measurement was made with a Doppler offset of 570 Hz which placed the test signal between filter peaks on both PRFs. Hence the Channel B SCV was approximately 0.7 dB lower. The actual operational SCV should be a value somewhere between 41.54 and 40.81 or approximately 41.2 dB. During the SCV testing, Doppler filters were successively removed to determine which filters were producing scan modulation clutter. Doppler filters 1 and 7 produced approximately 95 percent of the scan modulation false targets from the MTD. The measured 75-percent SSPD detection range with a 2.6 dBsm aircraft at a true altitude of 16,300 feet and an active beam antenna tilt of 4.0 deg T was 47.1 NM. After adjusting for power and noise figure deviations from specified values, this equates to an on main-beam axis 75-percent SSPD range of 68.27 NM. This investigation indicates that, different implementation techniques notwithstanding, the TI implemented MTD is the equal in SCV and range performance of the original Lincoln Laboratories MTD.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 15, 1980
- Accession Number
- ADA096292