Browsing by Author "Rojas, John"

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    Design and implementation of a high speed interface system over Gigabit Ethernet based on FPGA for use on radar acquisition systems
    (Institute of Electrical and Electronics Engineers, 2018-01) Rojas, John; Verástegui, Joaquín; Milla, Marco
    The Jicamarca Radio Observatory (JRO) is part of the Western Hemisphere chain of Incoherent Scatter Radar (ISR) observatories which extends from Lima, Peru to S0ndre Str0mfjord, Greenland. The equatorial ionosphere is studied only by JRO in the world. The Observatory is a facility of the Instituto Geofísico del PerU operated with support from the US National Science Foundation Cooperative Agreements through Cornell University. One of the main radar components is JARS (Jicamarca Acquisition Radar System), which functionality is based on CPLDs (Complex Programmable Logic Device) to configure the system and transfer the data from the digital receivers to the acquisition computer over a proprietary interface NI PCIe-6537. However due to some limitations as its high cost, driver updates dependency and the data transfer speed, it was necessary to replace this interface with the design and implementation of a high-speed hardware, embedded on FPGA devices, to transmit the data through the LVDS interface to a double buffering stage, and forward these as packets on the standard Gigabit Ethernet, based on the IEEE 802.3 protocol and using the UDP protocol. In this way, this development will allow to update the hardware of the current JARS to get a low cost portable system and to work with the required bandwidth. A prototype of this system was developed on the JRO and also a customized software was written, based on UDP socket and multiple threads of execution.
    Palabras clave:FPGALVDSDouble buffering
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    Digital receiver modernization using FPGA and JESD204B interface for SDR applications
    (IEEE, Institute of Electrical and Electronics Engineers, 2023) Verástegui, Joaquín; Rojas, John; Tupac, Isaac; Gonzales, Luis
    The latest data acquisition system running at the Jicamarca Radio Observatory (JRO) for the main radar has been used for more than seven years now. Although there are no major inconveniences on the performance, there have been some problems with internal interference which are related to the PCB design that uses old discrete components. A new design is proposed for the digital receivers, giving it more lifetime and flexibility for future modifications. The JESD204B protocol is ideal for radar applications, a JESD204B ADC together with an FPGA was proposed for the new design, making it capable of a wider bandwidth which could adapt the system to an SDR device in the future with the proper software. This paper will present the new PCB design, the IP cores implemented for the FPGA and some preliminary tests with development boards.
    Palabras clave:ProtocolsObservatoriesData acquisition
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    Initial design of a GNU radio interface for the new version of the Jicamarca Acquisition Radar System (JARS 2.0)
    (Instituto Geofísico del Perú, 2020-06) Tupac, Isaac; Rojas, John; Verástegui, Joaquín; Espinoza, Juan Carlos; Milla, Marco
    In this poster the initial design of a new software interface to control the novel ethernet based radar acquisition system JARS 2.0 of the Jicamarca Radio Observatory is presented. This interface will be implemented using the open-source software development toolkit GNU Radio; which besides controlling the JARS 2.0, it will obtain the acquired data for its further processing. The aim of the project, although in its development stage, will be to use the benefits of the GNU Radio to process, plot and even save the data in an standard way.
    Palabras clave:Ionospheric radarJicamarca radarJARS