3mm amplitude test by Cheng-Jiun Ma. Observation Source : Orion SiO Frequency: 86.243GHz 256 channels within 64MHz bandwidth Ant 3 & Ant 4 no Tsys correction.

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Presentation transcript:

3mm amplitude test by Cheng-Jiun Ma

Observation Source : Orion SiO Frequency: GHz 256 channels within 64MHz bandwidth Ant 3 & Ant 4 no Tsys correction fixed attenuations

off source Cross correlation of ant 3 and ant 4

Possible reason System temperature fluctuation Variation of gain in receivers/antenna Inteferometry phase fluctuation Pointing accuracy

central band off source central band on source autocorrelation signal and noise

Compare the product of autocorrelation amplitude of ant3 & ant4 with the cross correlation amplitude. The amplitude variation comes from the single dishes, and not because of the inteferometry phase.

Second observation High time resolution (0.3 sec) cross correlation only 32 channels with 128MHz bandwidth

Third observation after adjust the pointing do bore sight track and ½ power track alternatively 10 sec averaging

ca34 Bore sight½ power AVG N_RMS The rms of the normalized amplitude is higher when the source is at 1/2 power.

Observation on 3.14 Source: Orion SiO Frequency: GHz With 32 channel in 128MHz band Ant 4 autocorrelation only

normalized amplitude v.s. time

rms of normalized amplitude v.s. time

aa off source bore sight½ power 1212 avg n_rms Autocorrelation data The autocorrelation amplitude rms is also higher when source is at half-power

The main reason for the variation System temperature The variance of the off-source-channel amplitude is much smaller than that of the on-source amplitude. gain receiver antennae The variance of the amplitude of the source on the peak is different from that of the source on the half power, which should not happen if the variation is caused by the antennae gain. phase 1.The product of the autocorrelation data is highly consistent with the cross correlation data. 2.Sometimes, the phase is quite stable but the amplitude still oscillates a lot. pointing tracking error 1.The error showed on the ACC system is not larger than 3 arcsec. 2.We are going to check this by mounting the optical telescope on the antennae. drift caused by the atmosphere There is a small time scale, about 10 seconds, for variation of the autocorrelation amplitude. The spatial scale of the random motion is about 10 arcsec.