| A Technology on the GPS CRPA Pattern Control Using the I/Q Vector Modulator |
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Jun-O Kim, Jun-Seung Bae |
| I/Q 벡터 모듈레이터를 이용한 GPS CRPA 패턴 제어기술 |
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김준오, 배준성 |
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국방과학연구소 |
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| Abstract |
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This paper describes the antenna based GPS anti-jamming technology called CRPA(Controlled Reception Pattern Antenna), which used $2{ imes}2$ array elements. In this system, the main functions are the antenna complex weight control and the GPS digital I/Q VM(Vector Modulator). To update the VM's I/Q complex weights, the PC based DAC(Digital to Analog Converter) module was also used and the two analog output voltages were applied to the $2{ imes}2$ array elements to synthesize the null pattern. In the study, we also simulated the $2{ imes}2$ GPS array null patterns to compare the null depth with experimental results. The VM was also modified at the frequency of 1.575GHz for the GPS L1 and controlled by the PC based VM software. |
| Key Words:
GPS, CRPA, VM, GPS Jamming, J/S |
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