CN205484831U

CN205484831U - Vehicle navigation information system

Info

Publication number: CN205484831U
Application number: CN201620002673.5U
Authority: CN
Inventors: 范晶晶; 奚羽; 刘帅; 朱策策
Original assignee: Tianjin Puzheng Power Technology Co ltd
Current assignee: Tianjin Puzheng Power Technology Co ltd
Priority date: 2016-01-05
Filing date: 2016-01-05
Publication date: 2016-08-17
Anticipated expiration: 2026-01-05

Abstract

The utility model discloses a vehicle navigation information system, including dead reckoning module, odometer, electron compass, inertia measuring unit, GPS receiver, central processing unit, output display unit and human -computer interaction unit, odometer, electron compass, inertia measuring unit and central processing unit are connected respectively to the dead reckoning module, still connect GPS receiver and output display unit respectively, and the human -computer interaction unit is still connected to the output display unit. The utility model discloses full play DSP add, take advantage of the advantage of operation, the real -time operation of navigational parameter has been realized, and utilize FPGA and TL16C554 to expand peripheral communication interface, communicate with DSP through data bus after trunning into serial data to parallel data, disengage the treater out from a large amount of IO interrupt response burdens, the efficiency of CPU's operation is improved, navigational parameter rethread data bus to FPGA form output with serial data after the conversion after resolving.

Description

A kind of vehicle navigation information

Technical field

This utility model relates to a kind of onboard system, specifically a kind of vehicle navigation information.

Background technology

At present, differential GPS horizontal positioning accuracy has reached 3 ~ 5m, fully meets the requirement of vehicle location precision.But, owing to, in the high building group of city or when passing viaduct, usually there will be gps signal occlusion issue, causing GPS normally not position.Dead reckoning (DR) is conventional vehicle positioning technology, but direction sensor accumulated error in time is bigger, it is impossible to individually, use for a long time.Use integrated navigation system to utilize position that GPS system provides and velocity information carry out real-time correction and compensation to the error of DR system；When gps signal losing lock, dead reckoning can be completed by DR system again, improve the reliability of integrated navigation system.

Integrated navigation system in addition to completing the work of a large amount of calculation process, Inertial Measurement Unit IMU(gyroscope to be realized and accelerometer) with the function such as the communicating of the data acquisition of the sensor such as GPS and external system, time series stereodata and man-machine interface.In this case, if only using a piece of dsp chip, then the real-time performance of system is poor, and therefore most combined systems all use two or more DSP or are made up of the scheme of master-slave mode multiprocessor system one or several general microprocessor MPU plus a DSP.And the scheme being combined currently with DSP with FPGA processes digital signal at a high speed and is increasingly widely adopted.

Summary of the invention

The purpose of this utility model is to provide a kind of vehicle navigation information, with the problem solving to propose in above-mentioned background technology.

For achieving the above object, the following technical scheme of this utility model offer:

A kind of vehicle navigation information, including dead-reckoning module, speedometer, electronic compass, Inertial Measurement Unit, GPS, center processing unit, output display unit and man-machine interaction unit, described dead-reckoning module connects speedometer, electronic compass, Inertial Measurement Unit and center processing unit respectively, being also respectively connected with GPS and output display unit, output display unit is also connected with man-machine interaction unit.

As further program of the utility model: described center processing unit includes memorizer, power module, fpga chip, dsp chip, serial port chip, GPS interface circuit and level switch module, dsp chip connects power module, memorizer and fpga chip respectively, fpga chip is also respectively connected with power module and serial port chip, serial port chip is also respectively connected with GPS interface circuit and level switch module, and described power module is also respectively GPS interface circuit and level switch module is powered.

As further program of the utility model: described dsp chip uses TMS320VC33.

As further program of the utility model: described fpga chip uses EP1K30.

As this utility model further scheme: described serial port chip uses TL16C554.

nullCompared with prior art，The beneficial effects of the utility model are: this utility model has given full play to DSP and added、The advantage of multiplication，Achieve the real-time operation of navigational parameter，And utilize FPGA and TL16C554 to extend peripheral communication interfaces，Communicated with DSP by data/address bus after serial data is transferred to parallel data，Processor is freed from substantial amounts of I/O interrupt response is born，Improve the operational efficiency of CPU，Navigational parameter after resolving is again by the form output with serial data after converting of data/address bus to FPGA，Simultaneously，Bigger in view of Inertial Measurement Unit data volume，Data updating rate is more than 100Hz，The each bag data received are not sent directly to DSP，But after being first filtered processing，Again by a FIFO，Temporarily data are stored，Data volume reaches to a certain degree when，Reinform DSP these data are taken away，Do so can alleviate the burden of DSP further，Improve operational efficiency.

Accompanying drawing explanation

Fig. 1 is the theory diagram of vehicle navigation information；

Fig. 2 is the theory diagram of center processing unit in vehicle navigation information.

Detailed description of the invention

Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.

Refer to Fig. 1～2, in this utility model embodiment, a kind of vehicle navigation information, including dead-reckoning module, speedometer, electronic compass, Inertial Measurement Unit, GPS, center processing unit, output display unit and man-machine interaction unit, described dead-reckoning module connects speedometer, electronic compass, Inertial Measurement Unit and center processing unit respectively, being also respectively connected with GPS and output display unit, output display unit is also connected with man-machine interaction unit；Described center processing unit includes memorizer, power module, fpga chip, dsp chip, serial port chip, GPS interface circuit and level switch module, dsp chip connects power module, memorizer and fpga chip respectively, fpga chip is also respectively connected with power module and serial port chip, serial port chip is also respectively connected with GPS interface circuit and level switch module, and described power module is also respectively GPS interface circuit and level switch module is powered；Described dsp chip uses TMS320VC33；Described fpga chip uses EP1K30；Described serial port chip uses TL16C554.

Operation principle of the present utility model is: refer to Fig. 1, and dead-reckoning module uses DR dead reckoning, and the absolute location information that GPS provides can be that DR provides the initial value of reckoning positioning and carries out error correction；On the other hand, the reckoning result of DR compensates for the random error in part GPS location, thus smooths positioning track.So, utilize suitable method two kinds of systems to be combined, make full use of the complementarity of its location information, it becomes possible to positioning precision and reliability that will be high when being used alone any method is compared in acquisition.

Navigation system has been developed as using the integrated navigation system of Fusion at present, navigational computer is while completing complicated calculations, it is also performed to substantial amounts of data communication, it is therefore necessary to there is abundant communication interface, completes the collection of sensing data, transformation task.This be accomplished by center processing unit can carry out with PERCOM peripheral communication while, computational accuracy to be ensured and arithmetic speed.

By system is carried out functional analysis, navigational computer needs data acquisition, data to process and data output function.Data input unit mainly completes the collection of various sensor output data；Data processing section mainly completes data filtering, the error compensation of mini inertia measurement element and initial alignment, Kalman filtering and carries out navigational parameter resolving etc.；Data output unit is mainly responsible for navigational parameter output, is applied to location navigation or next step input needed.

Owing to using multiple sensors to carry out information fusion, need more peripheral communication interfaces, simultaneously, external sensor data output communication is mainly carried out by meeting the asynchronous serial communication mouth of rs-232 standard, if with central processing unit is joined directly together, substantial amounts of interrupt response will have influence on the processing speed of CPU, and the serial port resource that current various MCU, MPU can provide also is limited.

Traditional design is a lot of is all to use PC104 as the center processor of system, and PC104 volume is big, and price is high, is unfavorable for the realization of the miniaturization of system, low-power consumption and low cost.Therefore, the design is considered as the scheme of DSP+FPGA+TL16C554 and is designed, wherein DSP completes main navigational parameter calculating, TL16C554 is utilized to carry out the extension of external communication interface, FPGA completes the simulation of serial ports and logic control accordingly to ensure between three by the high-speed communication of data wire, the operational efficiency of raising system and operational precision.

The core processor of center processing unit to complete large-scale matrix operations and algebraic operation, and therefore system selects float-point DSP TMS320VC33.This chip has the arithmetic speed of 150MFLOPS and 75MIPS, single command cycle 13ns.TMS320VC33 improves speed by improving hardware capability, and other processors improve speed by improving software function or code rate.It is this that to put forward high performance mode on conventional single chip DSP by hardware be impossible.Processor has to integer within the single cycle, and floating data performs the power of parallel multiplication arithmetic operator simultaneously.This chip has the features such as low-power consumption, low cost simultaneously, meets the design requirement of system.

FPGA has programmable features, it is possible to be readily achieved the logic function that we are required.Utilize FPGA to extend peripheral communication interfaces, mainly standby as system of the serial communication port of extension Transistor-Transistor Logic level.According to completing the resource requirement of serial communication and extending the consideration of use from now on, use the ACEX1K30(hereinafter referred to as ep1k30 of ALTERA company here) complete this work.Ep1k30 can provide the resource of 119000, has 1728 logic macrocells, it is possible to achieve UART serial ports, and can complete to decode accordingly simultaneously, the function such as logic control.

System includes multiple sensor, and this just requires that processor to expand multiple serial ports.Dsp chip TMS320VC33 itself has serial communication port, if the serial port resource directly utilized on DSP sheet carries out serial communication, it is only applicable to transmit data fewer, the occasion that transfer rate is slow, its software programming is more complicated, and controls serial communication and to take the biggest system resource, affect sensor processes function in real time, therefore, native system have employed the 4 passage asynchronism transceiver integrated chip TL16C554 extension DSP serial ports that TI company produces, it is achieved sensor and the communication of navigational computer.This chip is that one has serial asynchronous communication.

The large scale integrated chip of interface, it is possible to achieve parallel/serial, the serial/parallel translation function of data.With the fifo buffer of 16 bytes inside it.Under fifo mode, transmitting and receive front is 16 byte data bags by data buffering, decreases the number of interruptions of CPU.Inside comprises the 16C550 asynchronous transmission device of 4 improvement so that serial i/O is relatively reliable.

System given full play to DSP carry out adding, the advantage of multiplication, achieve the real-time operation of navigational parameter, and utilize FPGA and TL16C554 to extend peripheral communication interfaces, communicated with DSP by data/address bus after serial data is transferred to parallel data, processor is freed from substantial amounts of I/O interrupt response is born, improves the operational efficiency of CPU.Navigational parameter after resolving is again by the form output with serial data after converting of data/address bus to FPGA.Simultaneously, bigger in view of Inertial Measurement Unit data volume, data updating rate is more than 100Hz, each bag data received is not sent directly to DSP, but after being first filtered processing, again by a FIFO, temporarily data are stored, data volume reaches to a certain degree when, reinform DSP and these data are taken away, do so can alleviate the burden of DSP further, improves operational efficiency.

It is obvious to a person skilled in the art that this utility model is not limited to the details of above-mentioned one exemplary embodiment, and in the case of without departing substantially from spirit or essential attributes of the present utility model, it is possible to realize this utility model in other specific forms.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims rather than described above, it is intended that all changes fallen in the implication of equivalency and scope of claim included in this utility model.Should not be considered as limiting involved claim by any reference in claim.

In addition, it is to be understood that, although this specification is been described by according to embodiment, but the most each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should can also be formed, through appropriately combined, other embodiments that it will be appreciated by those skilled in the art that as an entirety, the technical scheme in each embodiment by those skilled in the art.

Claims

1. a vehicle navigation information, including dead-reckoning module, speedometer, electronic compass, Inertial Measurement Unit, GPS, center processing unit, output display unit and man-machine interaction unit, it is characterized in that, described dead-reckoning module connects speedometer, electronic compass, Inertial Measurement Unit and center processing unit respectively, being also respectively connected with GPS and output display unit, output display unit is also connected with man-machine interaction unit.

Vehicle navigation information the most according to claim 1, it is characterized in that, described center processing unit includes memorizer, power module, fpga chip, dsp chip, serial port chip, GPS interface circuit and level switch module, dsp chip connects power module, memorizer and fpga chip respectively, fpga chip is also respectively connected with power module and serial port chip, serial port chip is also respectively connected with GPS interface circuit and level switch module, and described power module is also respectively GPS interface circuit and level switch module is powered.

Vehicle navigation information the most according to claim 2, it is characterised in that described dsp chip uses TMS320VC33.

Vehicle navigation information the most according to claim 2, it is characterised in that described fpga chip uses EP1K30.

Vehicle navigation information the most according to claim 2, it is characterised in that described serial port chip uses TL16C554.