Introduction
VPX is a new generation bus standard based on high-speed serial bus. The original purpose of this standard is to protect the users of the VME bus, inherit and continue the VME bus. However, then the standard makers found that a small amount of repair work could not meet the demand, so they made a thorough reform of many specifications. The VPX bus standard has the following outstanding advantages and advancements:
(1) It has powerful I/0 capabilities and high-performance network switching capabilities to support higher backplane bandwidth, providing sufficient bandwidth and processing capabilities for radar signal processing. The VPX standard defines a new 7-row high-speed I/0 connector up to 6.25Gb/s, which can fully support the current high-speed serial interconnection standards. These standards include SRIO, PCIE, RocketIO, SATA, Gbit Ethernet and 10Gbit Ethernet. At the same time, the number of user-definable I/0 pins has been greatly increased, providing sufficient space for future upgrades and expansion.
(2) The VPX standard provides detailed definitions for the dimensions of the VPX board, the topology of the backplane, the socket definitions when supporting various serial standard protocols, the definition of power sockets, and the definition of monitoring buses. This lays a solid foundation for the generalization of radar signal processing and data processing platforms.
(3) The VPX standard is specially formulated for key high-performance systems. Its excellent heat dissipation performance and highly reliable connectors give the system super stability, while having a sturdy and compact structure, good magnetic compatibility, strengthened circuit boards and super high power Design and other features. Tests have proved that the VPX standard can be used in harsh environments such as military and aerospace applications.
VPX system structure
The hardware system adopts VPX architecture design, each function is distributed on different VPX processing boards, and data interconnection is realized through backplane interconnection or switch board. The main function boards include signal processing board, switch board, acquisition and storage board, backplane, etc. The signal processing and data processing board adopts a general design (high-performance FPGA and dual-core CPU combined architecture) to realize signal processing, detection, data processing and other functions, including DBF boards, multiple signal processing boards, and motherboards. The VPX chassis adopts a 7U reinforced chassis, and the power supply adopts a dual-redundant power supply design. There are a total of 10 VPX board slots (including 1 motherboard, 1 switch board, and 8 user-defined VPX boards). The interval is 2. 54 cm. The VPX board is installed with positioning pins and guide rails. All boards are installed inside the VPX chassis.