System of Weak Signal Detection Based on TD-SCDMA Dual Polarized Antenna

ABSTRACT

In the current signal measuring equipment in measurable characteristics under the condition of weak signal, the signal measurement accuracy is not high. Therefore, this study designs and realizes a kind of equipment based on TD - SCDMA dual polarized antenna for weak signal measurement system. System uses the 2.4 GHz ISM A7105 RF transmitter sent via baud generator clock for electromagnetic wave frequency control forming the local magnetic fields, the system design includes ICL7650 AD620 chip signal amplification module, combined with a module combination based on isolation MAX275 chips, by adjusting the built-in six resistance to noise filtering, in the design of TD -SCDMA dual polarization antenna, through multiple columns of smart antenna radiation, to form the sensitivity of the dynamic contact, to strengthen the weak signal loss repair characteristic, for the synchronization of GPRS communication and AT89C51 MCU for weak signal processing; finally it realizes the weak signal accurate detection. Through the experiment testing, the system can, in complex environment, able for the accurate detection of weak signal. Compared with the traditional system, its detection accuracy by about 49%, reduced testing time by 5 seconds, has a strong practical application value.

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