CN203376745U

CN203376745U - Multi-channel radio-frequency signal synchronous acquisition system based on PXIe bus

Info

Publication number: CN203376745U
Application number: CN201320488650.6U
Authority: CN
Inventors: 李远朝; 左中梁; 邵晖; 张喜庆; 俞一鸣; 陈柯
Original assignee: Shanghai VI Service Network Co Ltd
Current assignee: Shanghai VI Service Network Co Ltd
Priority date: 2013-08-12
Filing date: 2013-08-12
Publication date: 2014-01-01
Anticipated expiration: 2023-08-12

Abstract

The utility model relates to a multi-channel radio-frequency signal synchronous acquisition system based on a PXIe bus. The multi-channel radio-frequency signal synchronous acquisition system is mainly formed by a PXIe computer case, a controller, a synchronous module and a radio-frequency signal acquisition and storage module, wherein the PXIe bus is arranged inside the PXIe computer case, and the controller, the synchronous module and the radio-frequency signal acquisition and storage module are all connected to the PXIe bus of the PXIe computer case through PXIe computer case insertion grooves. According to the multi-channel radio-frequency signal synchronous acquisition system, the route of synchronizing signals and high speed synchronous acquisition, transmission and storage of the signals are built and achieved based on the PXIe bus technology, a synchronous sampling clock and a synchronous triggering signal are generated through the synchronous module to drive multi-channel synchronous acquisition of the radio-frequency signal acquisition and storage module, and users of the multi-channel radio-frequency signal synchronous acquisition system can flexibly configure the number of the computer case and the number of acquisition channels according to requirements. The multi-channel radio-frequency signal synchronous acquisition system has the high synchronous performance and is flexible in configuration.

Description

A kind of hyperchannel radiofrequency signal synchronous based on the PXIe bus

Technical field

The utility model relates to a kind of radiofrequency signal acquisition system, especially a kind of hyperchannel radiofrequency signal synchronous based on the PXIe bus.

Background technology

The radiofrequency signal acquisition system is applied to communication and fields of measurement usually, for by radiofrequency signal frequency conversion digitizing, so that application such as the off-line analysis of signal, signal playback.

For hyperchannel radiofrequency signal acquisition system, high sampling rate is very high to the rate requirement of the transmission of data and storage.The mass data that system need to produce the multi-channel signal acquiring module, pass through the bus real-time Transmission, write memory module.

For hyperchannel radiofrequency signal acquisition system, each passage be synchronously very important performance index.Usually in order to guarantee the net synchronization capability gathered, need each acquisition channel to share and gather clock signal, trigger collection signal, and the net synchronization capability difference that in taking into full account each acquisition channel at system with in realizing, unlike signal route, different components cause.

PCI expansion (PXI) system towards instrument system is a kind of surveying instrument system platform of being accepted extensively by industry member.Its upgraded version PXIe platform provides higher bus bandwidth, special-purpose high performance synchronous bus.The PXIe system consists of PXIe cabinet, controller and peripheral module.The radio-frequency module of PXIe bussing technique mating die blocking can flexible configuration communication and test macro, builds the surveying instrument towards various application, such as gps signal synchronous acquisition, Big Dipper signal synchronous collection etc.

Summary of the invention

In order to realize hyperchannel radiofrequency signal synchronous acquisition, the purpose of this utility model has been to propose a kind of radiofrequency signal synchronous based on the PXIe bus, and the user can be according to practical application request, the port number of flexible configuration system.Design in the utility model, met high speed data transfer and storage demand, guaranteed good synchronization performance between different configuration lower channels.

The difference of the port number configured according to acquisition system, can be configured to unit case and multiple cases system.

The hyperchannel radiofrequency signal synchronous based on the PXIe bus the utility model proposes, described synchronous adopts unit case system, by PXIe cabinet 1, controller 2, synchronization module 3 and radiofrequency signal collection and memory module 4, formed, wherein: PXIe cabinet 1 inside is provided with the PXIe bus, and controller 2, synchronization module 3 and radiofrequency signal collection and memory module 4 all are connected on the PXIe bus of PXIe cabinet by PXIe cabinet slot.

In the utility model, described synchronization module 3 comprises sampling clock source 5, trigger signal source 6, reference clock source 7 and External Reference clock 8, the input end of described reference clock source 7 connects External Reference clock 8, output terminal connects the PXIe bus, and the output terminal of sampling clock source 5 and trigger signal source 6 is connected respectively the PXIe bus.

In the utility model, described several unit case Cascade Systems, form the multiple cases system, one of them unit case system is as mainframe box, all the other unit case systems are as from cabinet, and the sampling clock source 6 in each synchronization module 3, trigger signal source 6 are respectively by the PXIe bus on identical connecting line connection mainframe box or the PXIe bus from cabinet.

In the utility model, the inner integrated PXIe bus of PXIe cabinet 1, can transmission reference clock, sampling clock, trigger pip and data message etc.

In the signal acquiring system that the utility model proposes, controller 2 operation acquisition softwares, the work of modules in controller 2, concrete function comprises:

1. operation acquisition software, the reference clock source of configuration synchronization module 3, control synchronization module 3 and produce sampling clock and trigger pips, and it is routed to output port, and specific input end mouth signal is routed to the PXIe bus.

2. operation acquisition software, control radiofrequency signal collection and memory module 4 each passages to radio frequency signal frequency conversion digitizing, by data through the PXIe bus transfer to controller 2, then by controller 2, data are write in the magnetic disk memory of radiofrequency signal collection and memory module 4.

In the acquisition system that the utility model proposes, synchronization module 3 major functions are configurations and produce reference clock, sampling clock and trigger pip.Each signal can route to the PXIe bus for local cabinet modules, also can route to the output port of synchronization module 3, for the synchronization module 3 of other cabinets.The concrete function of synchronization module 3 comprises:

1. use external reference clock or inner high accuracy real-time clock, it is routed to the PXIe bus, as the reference clock source of each module in system.

2. the route of generation sampled clock signal, and control sampled clock signal.

3. generation trigger pip, and the route of control trigger pip.

In the acquisition system that the utility model proposes, each synchronizing signal that radiofrequency signal collection and memory module 4 major functions are based on the PXIe bus realizes each passage radiofrequency signal frequency conversion, collection and storage.Concrete function comprises:

1. the clock on each passage use PXIe bus, as the reference clock, drives this passage frequency converter and collector work, guarantees interchannel timing synchronization performance.

2. the local oscillation signal of each passage frequency converter can connect with daisy chaining, guarantees the net synchronization capability of interchannel local oscillation signal.

3. each passage is used the sampling clock that derives from synchronization module 3 on the PXIe bus as sampling clock, and intermediate-freuqncy signal is gathered.The PXIe bus has guaranteed that synchronization module 3 is to net synchronization capability between the sampling clock of radiofrequency signal collection and memory module 4 each passages.

4. each passage collector uses on the PXIe bus and derives from the trigger pip of synchronization module 3 as the trigger collection signal.The PXIe bus has guaranteed that synchronization module 3 is to net synchronization capability between the trigger pip of radiofrequency signal collection and memory module 4 each passages.

5. each passage collector through the PXIe bus, is sent to controller 2 by image data, and, under the control of controller 2, image data is write in this passage magnetic disk memory.The high bandwidth that the PXIe bus provides meets the demand of multi-channel high-speed data transmission.

The multiple cases system is comprised of a plurality of unit case systems.Reference clock between cabinet, sampling clock, trigger pip connecting line need to be used the signal connecting line identical with the unit case, to have guaranteed the net synchronization capability of all acquisition channels in the system.As shown in Figure 3.

In the multiple cases system, for sampling clock, the output port of mainframe box synchronization module 3 is delivered to sampling clock from cabinet synchronization module 3, and by from cabinet synchronization module 3, sampling clock being delivered to the PXIe bus from cabinet.Sampling clock is produced by mainframe box synchronization module 3, and routes to each passage of each cabinet radiofrequency signal collection and memory module 4 by identical path-length.Thereby the synchronous acquisition of each acquisition channel of different cabinets in the assurance system.

In the multiple cases system, for trigger pip, the output port of mainframe box synchronization module 3 is delivered to trigger pip from cabinet synchronization module 3, and by from cabinet synchronization module 3, trigger pip being delivered to the PXIe bus from cabinet.Trigger pip is produced by mainframe box synchronization module 3, and routes to each passage of each cabinet radiofrequency signal collection and memory module 4 by identical path-length.Thereby the synchronous triggering collection of each acquisition channel of different cabinets in the assurance system.

The beneficial effects of the utility model are: based on the PXIe bussing technique, build a kind of support hyperchannel radiofrequency signal synchronous.The system channel data can configure according to the actual samples demand.Design at the interchannel synchronization aspects has guaranteed the synchronous acquisition performance that system is good.

The accompanying drawing explanation

Fig. 1 is the unit case configuration pie graph of a kind of hyperchannel radiofrequency signal synchronous based on the PXIe bus of the utility model.

Fig. 2 is the unit case configuration synchronization module 3 signal link figure of a kind of hyperchannel radiofrequency signal synchronous based on the PXIe bus of the utility model.

Fig. 3 is the multiple cases configuration synchronization module 3 signal link figure of a kind of hyperchannel radiofrequency signal synchronous based on the PXIe bus of the utility model.

Number in the figure: 1. PXIe cabinet, 2. controller, 3. synchronization module, 4. radiofrequency signal collection and memory module, 5. sampling clock source, 6. trigger signal source, 7. reference clock source, 8. External Reference clock.

Embodiment

Below by specific embodiment, the utility model is further illustrated.

Embodiment 1: following each parts are assembled by mode shown in Fig. 1, and these those skilled in the art all can implement smoothly.PXIe cabinet 1 adopts NI PXIe-1085 cabinet, and its core bus is the PXIe bus, realizes the route of sampling clock and trigger pip.Controller 2 adopts NI PXIe-8135 controller.Synchronization module 3 adopts the combination of NI PXIe-6674T+ NI PXI-6682H, and wherein NI PXIe-6674T can be system and produces sampling clock, and NI PXI-6682T can be system and produces trigger pip.Radiofrequency signal gathers and a passage of memory module 4 can be realized by NI PXIe-5652+NI PXIe-5601+ NI PXIe-7966+ NI 5761+NI 8262+NI HDD8265 combination.Concrete configuration is as shown in table 1.In NI PXIe-1085 cabinet, the radiofrequency signal collection of unit case and storage can be configured at most 3 passages.

Table

As shown in Figure 2, the optionally connected external reference clock that is subject to of clock source in system, to PXIe bus output reference clock.Sampling clock source 5 routes to output port by sampling clock, sampling clock is routed to the PXIe bus after can being connected to input port by radio-frequency cable.Trigger signal source 6 routes to output port by trigger pip, trigger pip is routed to the PXIe bus after can being connected to input port by radio-frequency cable.

As shown in Figure 3, in system, the external reference clock can be connected to mainframe box and from the clock source of cabinet by same cable.Sampled clock signal produces and routes to output port by mainframe box sampling clock source 5, uses same cable that sampled clock signal is connected to mainframe box and from the input port of cabinet, routes to respectively mainframe box and from the PXIe bus of cabinet.Trigger pip produces and routes to output port by mainframe box trigger signal source 6, uses same cable that trigger pip is connected to mainframe box and from the input port of cabinet, routes to respectively mainframe box and from the PXIe bus of cabinet.

Claims

1. the hyperchannel radiofrequency signal synchronous based on the PXIe bus, it is characterized in that synchronous adopts unit case system, by PXIe cabinet (1), controller (2), synchronization module (3) and radiofrequency signal collection and memory module (4), formed, wherein: PXIe cabinet (1) inside is provided with the PXIe bus, and controller (2), synchronization module (3) and radiofrequency signal collection and memory module (4) all are connected on the PXIe bus of PXIe cabinet by PXIe cabinet slot.

2. a kind of hyperchannel radiofrequency signal synchronous based on the PXIe bus according to claim 1, the described synchronization module of its feature (3) comprises sampling clock source (5), trigger signal source (6), reference clock source (7) and External Reference clock (8), the input end of described reference clock source (7) connects External Reference clock (8), output terminal connects the PXIe bus, and sampling clock source (5) are connected respectively the PXIe bus with the output terminal of trigger signal source (6).

3. a kind of hyperchannel radiofrequency signal synchronous based on the PXIe bus according to claim 2, it is characterized in that described several unit case Cascade Systems, form the multiple cases system, one of them unit case system is as mainframe box, all the other unit case systems are as from cabinet, and the sampling clock source (5) in each synchronization module (3), trigger signal source (6) are respectively by identical connecting line connection mainframe box or the PXIe bus from cabinet.