CN206388031U - Hyperfrequency rangefinder control system - Google Patents

Abstract

The utility model discloses a kind of hyperfrequency rangefinder control system and its implementation.Circuit system includes Cortex A9 ARM main control chips, capacitance touch screen, network card chip, FRAM memory, 4*4 matrix keyboards and 3.3V button cells；By carrying out whole redesigns to circuit system, hardware circuit small volume, it is lightweight, powerful, strong antijamming capability, Software for Design constructs (SuSE) Linux OS, the core CPU of technical grade 4 1GHz dominant frequency causes system response time short, stability is high, and Function Extension is more prone to, so as to meet the demand of distance-measuring equipment VOR platform.After hyperfrequency rangefinder controlling system design success so that production cost is reduced to original 1/2nd, and function is more perfect, it is easy to debugs, produce and repairs, and achieves preferable technical benefits and economic benefit.The novel ultra-high frequency rangefinder control system working stability, dependable performance.

Description

Hyperfrequency rangefinder control system

Technical field

The utility model is related to the airmanship suitable for DME ground installations, more particularly to a kind of hyperfrequency ranging instrument control System processed.

Background technology

The control circuit of traditional hyperfrequency rangefinder control system generally uses DSP+FPGA frameworks, externally only RS232 serial ports and GPIO communications, software is entirely bare machine code, and Function Extension is difficult；Man-machine interface only has one block of 5.7 cun of liquid crystal Screen and control button, significantly limit secondary development and the customizing functions of product.In view of the deficiency of existing product design, system is rung Long, cost is high between seasonable, job insecurity, performance are unreliable, it is impossible to meets the demand of increasingly harsh performance indications, deposits simultaneously The problem of can not minimize；How to solve this problem just becomes those skilled in the art's class to be studied and solved Topic.

The content of the invention

The purpose of this utility model be in order to overcome the deficiencies in the prior art, i.e., for existing product cost is high, volume is big, The problems such as client modules interface such as system response time length and remote control is inconsistent, especially provides a kind of novel ultra-high frequency and surveys Distance meter control system.The rangefinder works in L-band, and 962~1213MHz of frequency range is aircraft together with airborne equipment Its oblique distance information between earth station is provided.Rangefinder terrestrial platform can be with instrument-landing-system（ILS）It is used in combination, for flight Device provides oblique distance information during landing, also can be with nodirectional beacon（DVOR）It is used in combination, the distance on air route is provided for aircraft Information.

The utility model is adopted the technical scheme that to achieve the above object：A kind of hyperfrequency rangefinder control system, It is characterized in that：The circuit system includes Cortex-A9 ARM main control chips, capacitance touch screen, network card chip, FRAM storages Device, 4*4 matrix keyboards and 3.3V button cells；The MAC mouths of described Cortex-A9 ARM main control chips connect with network card chip Connect, network card chip connects clock source and status lamp respectively, network card chip is connected with network isolation transformer again, Network Isolation transformation Device connects Ethernet by RJ45；The UART mouths of Cortex-A9 ARM master control cores are connected with GPS, Cortex-A9 ARM master controls The LVDS mouths of core are connected with capacitance touch screen, and the IIC mouths of Cortex-A9 ARM main control chips are connected with FRAM memory, The GPIO mouths of Cortex-A9 ARM main control chips are connected with 4*4 matrix keyboards, and the RTC mouths of Cortex-A9 ARM main control chips are even 3.3V button cells are connect, the CAN mouths of Cortex-A9 ARM main control chips connect monitor, receiver and transmitting by CAN Machine.

Beneficial effect produced by the utility model is：By carrying out whole redesigns, hardware circuit to circuit system Small volume, lightweight, powerful, strong antijamming capability, Software for Design constructs (SuSE) Linux OS, the core CPU of technical grade 4 1GHz dominant frequency cause system response time short, stability is high, and Function Extension is more prone to, so as to meet distance-measuring equipment VOR platform Demand.After hyperfrequency rangefinder controlling system design success so that production cost is reduced to original 1/2nd, function It is more perfect, it is easy to debug, produce and repair, achieve preferable technical benefits and economic benefit.The novel ultra-high frequency ranging Instrument control system working stability, dependable performance.

Brief description of the drawings

Fig. 1 is that system of the present utility model connects block diagram；

Fig. 2 is logic control general flow chart of the present utility model；

Fig. 3 is the flow chart of server reception and transmission thread in Fig. 2；

Fig. 4 is the flow chart of CAN receiving or sending threads in Fig. 2；

Fig. 5 is the flow chart of serial ports receiving or sending thread in Fig. 2；

Fig. 6 is the flow chart of network interface receiving or sending thread in Fig. 2；

Fig. 7 is the flow chart of IO control threads in Fig. 2；

Fig. 8 is AD samplings and processing thread flow figure in Fig. 2.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail：

As shown in figure 1, the system circuit include Cortex-A9 ARM main control chips, capacitance touch screen, network card chip, FRAM memory, 4*4 matrix keyboards and 3.3V button cells；The MAC mouths of Cortex-A9 ARM main control chips connect with network card chip Connect, network card chip connects clock source and status lamp respectively, network card chip is connected with network isolation transformer again, Network Isolation transformation Device connects Ethernet by RJ45；The UART mouths of Cortex-A9 ARM master control cores are connected with GPS, Cortex-A9 ARM master controls The LVDS mouths of core are connected with capacitance touch screen, and the IIC mouths of Cortex-A9 ARM main control chips are connected with FRAM memory, The GPIO mouths of Cortex-A9 ARM main control chips are connected with 4*4 matrix keyboards, and the RTC mouths of Cortex-A9 ARM main control chips are even 3.3V button cells are connect, the CAN mouths of Cortex-A9 ARM main control chips connect monitor, receiver and transmitting by CAN Machine.

The system circuit includes Cortex-A9 ARM control chips, 10.1 cun of capacitance touch screens of wide temperature range type（LVDS interface）、 2GB DDR3 internal memories, 256MB Nand Flash memorizers, 1 GPS communication serial ports（It can receive what GPS modules were sent NEMA0183 messages）, 1 debugging serial ports（For type information and input debug command row）, IIC equipment interfaces（Pass through I²C is set Standby interface carries out I/O extensions）, SPI equipment interfaces FRAM（The FRAM memory that power down is not lost can be for data storage and ginseng Number）, CAN communication interface（With monitor, receiver, transmitter communications）, 10/100Mbps ethernet interfaces（With dimension Shield software and remote control are communicated）, 4*4 matrix press-keys control circuit, 64 GPIO mouthfuls（The input of 32 way switch amounts and 32 tunnels The output of switching value）.

As shown in Fig. 2 the system uses NXP chip i.MX6Q hardware platforms, built-in Linux operating system is built；It is soft Part is developed using the CodeBlocks software cross pattern compilers under (SuSE) Linux OS；Control software by application program, File system, kernel program, four layers of composition of startup program, its logic control have following steps：

（One）, system electrification, load startup program；

（Two）, start kernel；

（Three）, load document system；

（Four）, application program is according to writing in the rc.local files under system directory/etc/init.d/ in advance Shell script commands are run, and respectively enter server processes, system control program process and AD collection conversion process；

（Five）, receive and send thread into after server processes, respectively enteing server；Enter into system control program CAN receiving or sending threads, serial ports receiving or sending thread, network interface receiving or sending thread and IO control threads are respectively enterd after journey；Gather and change into AD AD samplings and processing thread are respectively enterd after process.

As shown in figure 3, server receiving thread performs following steps：Two semaphores are first created, then create two and are shared Internal memory, then by calling after Socket () function, Bind () function, Listen () function, into server reception and Thread is sent, then calls Close () function to close socket, two semaphores are finally deleted.

As shown in figure 4, CAN receiving or sending threads perform following steps：Read and receive first and come from receiver, emitter, prison Survey the CAN data of device and cache, CAN data frame heads of then packing forward CAN data messages, write CAN and transmit packets to caching Simultaneously it is handed down to receiver, emitter, monitor in area.

As shown in figure 5, serial ports receiving or sending thread performs following steps：Serial ports receives the data from GPS, then carries out data Parsing, and the message for response of packing, finally write serial ports and transmit packets to buffer area and return to GPS.

As shown in fig. 6, network interface receiving or sending thread performs following steps：Shared drive is created first, then receives network interface data, And data are handled, finally write network interface and transmit packets to buffer area and return to client.

As shown in fig. 7, IO control threads perform following steps：First plus thread lock, then by by IIC serial-port extensions I/O chip PCA 9555 is read after the status data from other cell boards, is updated system mode, is finally opened thread lock.

As shown in figure 8, A/D samplings and processing thread perform following steps：Flashing light program is initially entered to indicate that A/D samples Carry out state, then PCA9554 chips carry out the configuration of multichannel time sharing sampling, then carry out A/D conversions, finally carry out A/D and turn Change processing.

The system design is described in detail below：

（1）The main control chip that the system is used is grace intelligence Pu（Freescale）The Cortex-A9 ARM chips of company I.MX6Q, using NXP chip i.MX6Q hardware platforms, builds built-in Linux operating system.Software operates system using Linux CodeBlocks software cross pattern compilers under system are developed.Control software is by application program, file system, kernel journey Sequence, four layers of composition of startup program.Startup program：Including hardware-related program, universal driver and its command tools journey Sequence；Kernel program：Carry out configuration cutting as needed in kernel setup, add the driving oneself write；File system：It is integrated Linux commonly used commands and instrument, provide fairly perfect environment for system；Application program uses multi-thread concurrent processing side Formula, realizes the various functions of control system.

（2）Main control part function mainly includes：Each working cell can be obtained from each working cell plate with completion status self-inspection Work state information and carry out computing and communications processing, obtain every monitoring parameter from monitor, and from each power supply Output obtains each power work status information, record storage and threshold discrimination is carried out to acquired every monitoring parameter, when super Go out and make corresponding prompting in limited time or operate, when important indicator project exceeds thresholding, send audible and visual alarm and favourable turn operation, can To complete operation automatically and manually to the start of two-way emitter, favourable turn, shutdown.

The concrete processing procedure of signal is：

CAN signal：Communications interface unit inquires that monitor, receiver, emitter response, message are divided into inquiry report Text, control message, three kinds of message of setting, communication meet CAN2.0 specifications, and message transmissions use CAN2.0B Extended Superframe Formats, ripple Special rate is 500Kbps.The response time<50ms, response time-out represents that operation is invalid.

Network interface signal：Safeguard by network interface connection between software and remote control and communication interface, using C/S model.Wherein lead to Letter interface is server end, and port numbers can configure；It is client to safeguard computer, remote control, and IP address and port numbers are configurable. Intercommunication uses response mode, and it is masters to safeguard end, and communication interface is answer party.Response message response time requirement< 100ms.Data storage little endian mode.

Rs 232 serial interface signal：Connected between communications interface unit and display unit by 232 string lines.Serial ports attribute is baud rate 115200,8 data bit, no parity check position, 1 stop position, no data flow control.Communication uses response mode, and front panel is tune With side, communication interface is answer party.Data storage is little endian mode.The communication interface response time<100ms.Both sides are interrupted Set of time is 10s between time-out.

（3）For the severe demand of product working environment, touch-screen uses technical grade model, and reinforces, most low energy - 30 DEG C are supported, using LVDS parallel ports interface mode, user's operation requirement is realized；By friendly human-computer interaction interface, correctly Show work in every parameter and status information of product etc..Additional customized 4*4 metal keyboards, it is standby when being failed as touch function With the button water proof and dust proof simultaneously has firm structure against damages and Electro Magnetic Compatibility.

（4）The system with the addition of the function of remote controller interface and local maintenance software network interface, and system remote control interface is It is used to complete with remotely monitor in hyperfrequency rangefinder with safeguarding the data communication units being connected.Major function includes：In control Communication link is set up between system and remote manipulator；Communication link is set up between control system and LMT Local Maintenance Terminal.System Remote Control Interface unit unite comprising two-way network port circuit, light net change-over circuit etc., the demand for meeting long-distance remote control equipment.Dimension Shield software client has a browser program, and control system has a corresponding Web server as server end, passed through CGI（CGI(Common gateway interface)）Realize the information exchange between external application.

The system technical indicator：

（1）Maximum functional clock：1GHz；

（2）Maximum memory space：256MB；

（3）Maximum running memory：2GB；

（4）Operating temperature range：- 30 DEG C~+50 DEG C；

（5）Interface type：USB、JTAG、UART、I²C, CAN interface, Ethernet interface etc..

Claims (1)

1. a kind of hyperfrequency rangefinder control system, it is characterised in that：The circuit system includes Cortex-A9 ARM master control cores Piece, capacitance touch screen, network card chip, FRAM memory, 4*4 matrix keyboards and 3.3V button cells；Described Cortex-A9 The MAC mouths of ARM main control chips are connected with network card chip, and network card chip connects clock source and status lamp respectively, network card chip again with Network isolation transformer is connected, and network isolation transformer connects Ethernet by RJ45；The UART of Cortex-A9 ARM master control cores Mouth is connected with GPS, and the LVDS mouths of Cortex-A9 ARM master control cores are connected with capacitance touch screen, Cortex-A9 ARM main control chips IIC mouths be connected with FRAM memory, the GPIO mouths of Cortex-A9 ARM main control chips are connected with 4*4 matrix keyboards, The RTC mouths connection 3.3V button cells of Cortex-A9 ARM main control chips, the CAN mouths of Cortex-A9 ARM main control chips pass through CAN connection monitor, Receiver And Transmitter.