Proyecto REX-2X - Radio Observatorio de Jicamarca
Proyecto REX-2X - Radio Observatorio de Jicamarca
Proyecto REX-2X - Radio Observatorio de Jicamarca
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ÍNDICE<br />
1. INTRODUCCIÓN.................................................................................................................................................................4<br />
2. DESARROLLO.....................................................................................................................................................................4<br />
2.1 Características <strong>de</strong>l Receptor Digital AD6620........................................................................................................................ 4<br />
2.1.1 Descripción general <strong>de</strong>l AD6620...........................................................................................................................4<br />
2.1.2 Conversor analógico digital utilizando sub -muestreo para señales <strong>de</strong> radio frecuencia.....................................5<br />
2.1.3 Desplazador <strong>de</strong> frecuencia. ....................................................................................................................................8<br />
2.1.4 Filtros CIC............................................................................................................................................................11<br />
2.1.5 Filtro RCF. ...........................................................................................................................................................11<br />
2.1.6 Interfaz digital <strong>de</strong> salida.......................................................................................................................................12<br />
2.2 Hardware <strong>de</strong>l equipo <strong>REX</strong>. .................................................................................................................................................. 12<br />
2.2.1 Bloque <strong>de</strong> Adquisición.........................................................................................................................................13<br />
2.2.1.1 Bloque <strong>de</strong> adquisición utilizando tarjetas <strong>de</strong> evaluación AD6620 y AD6640 ...................................................13<br />
2.2.1.2 Bloque <strong>de</strong> adquisición con tarjeta <strong>de</strong>sarrollada en <strong>Jicamarca</strong>.............................................................................14<br />
2.2.2 Bloque multiplexor <strong>de</strong> señal ................................................................................................................................16<br />
2.2.2.1 Multiplexor <strong>de</strong>l equipo <strong>REX</strong>- 2A ........................................................................................................................16<br />
2.2.2.2 Multiplexor <strong>de</strong>l equipo <strong>REX</strong>- <strong>2X</strong> ........................................................................................................................17<br />
2.2.3 Bloque <strong>de</strong> control. ................................................................................................................................................18<br />
2.3 Descripción lógica <strong>de</strong> la unidad <strong>de</strong> control.......................................................................................................................... 19<br />
2.3.1 Transferencia <strong>de</strong> datos a la tarjeta NI-6534.........................................................................................................20<br />
2.3.2 Sincronización entre señales <strong>de</strong>l multiplexor y el Controlador <strong>de</strong> Radar........................................................21<br />
2.3.3 Lógica <strong>de</strong> control <strong>de</strong>l <strong>REX</strong>-2A ............................................................................................................................22<br />
2.3.4 Lógica <strong>de</strong> control <strong>de</strong>l <strong>REX</strong>-<strong>2X</strong> ............................................................................................................................22<br />
2.3.4.1 Bloque ENABLE_RECEIVERS .........................................................................................................................23<br />
2.3.4.2 Bloque INPUT_SYNC.........................................................................................................................................24<br />
2.3.4.3 Bloque ADQ_NIDAQ..........................................................................................................................................25<br />
2.3.4.4 Bloque PREPARE_SIGNAL...............................................................................................................................27<br />
2.3.4.5 Deshabilitación en escritura.................................................................................................................................28<br />
2.3.4.6 Bloque FIFO_CONTROL ...................................................................................................................................29<br />
2.4 Software Del Sistema. .......................................................................................................................................................... 32<br />
2.4.1 Software “ACQUIRE PANEL CONTROL”.......................................................................................................32<br />
2.4.2 Software “ACQUIRE CONSOLE” .....................................................................................................................33<br />
3. RESULTADOS....................................................................................................................................................................34<br />
3.1 Transferencia Máxima.......................................................................................................................................................... 34<br />
3.2 Pruebas <strong>de</strong> rango dinámico .................................................................................................................................................. 34<br />
4. BIBLIOGRAFÍA.................................................................................................................................................................36<br />
5. ANEXOS...............................................................................................................................................................................37<br />
ANEXO A Programación y configuración <strong>de</strong>l sistema <strong>de</strong> adquisición....................................................................................... 37<br />
ANEXO B Código Fuente............................................................................................................................................................. 40<br />
ANEXO C Arquitectura interna <strong>de</strong>l FPGA................................................................................................................................... 51<br />
ANEXO D Diagramas esquemáticos <strong>de</strong> las tarjetas <strong>de</strong>l equipo <strong>REX</strong>-2x .................................................................................... 54<br />
ANEXO E Diagramas <strong>de</strong> circuito impreso ................................................................................................................................... 60<br />
ANEXO F Lista <strong>de</strong> componentes.................................................................................................................................................. 67