CN202217051U

CN202217051U - LFMCW radar system

Info

Publication number: CN202217051U
Application number: CN2011202263802U
Authority: CN
Inventors: 蒋留兵; 柴林峰; 车俐; 林和昀; 沈翰宁; 梁漫
Original assignee: Guilin University of Electronic Technology
Current assignee: Guilin University of Electronic Technology
Priority date: 2011-06-30
Filing date: 2011-06-30
Publication date: 2012-05-09
Anticipated expiration: 2021-06-30

Abstract

The utility model provides an LFMCW (Linear Frequency Modulated Continuous Wave) radar system. An information processing platform of the LFMCW radar system comprises a dual processor formed by a DSP (Digital Signal Processor) and an FPGA (Field Programmable Gate Array); wherein an information processing algorithm unit of the FPGA comprises a space-time complex rate distribution module; the DSP comprises one RAM (Random Access Memory), the FPGA comprises double RAMs, thus operating speed can be raised; the FPGA is provided with a serial port, a USB (Universal Serial Bus) interface, an I/O (Input/Output) interface, a PCI (Peripheral Controller Interface) bus interface and an optical fiber interface; an NIOS II can be embedded into the FPGA; and the FPGA is also connected with a host computer provided with a human-computer interface, wherein the host computer can be connected to a alarm device and/or an automatic control device, etc. The LFMCW radar system in the utility model has the beneficial effects that: the information processing platform of the LFMCW radar system can calculate and process real-time data, in order to obtain real-time data of position and speed of a front object, and to display the real-time data on the human-computer interface; the space-time complex rate distribution module distributes various algorithms to the FPGA and the DSP respectively according to space-time complex rates Q of the algorithms for processing radar signals, thus advantages of the FPGA and the DSP can be made full use of, and the LFMCW radar system can operate smoothly with a high efficiency; and the human-computer interface also can display object images in real time to assist operations, and can ensure safety.

Description

The linear frequency modulation continuous wave radar system

(1) technical field

The utility model relates to the The radar exploration technique field, is specially a kind of linear frequency modulation continuous wave radar system.

(2) background technology

Radar Technology not only militarily has significance; All be widely used in fisheries industry, mining industry etc.; In recent years the Realtime Level of industrial production line measure and anti-collision system for automobile on linear frequency modulated continuous wave radar because of its receive that external interference is little, measuring accuracy is high, easy to operate, also come into one's own day by day.

The existing linear frequency modulation continuous wave radar system that belongs to radiowave has adopted the dual processor (FPGA) of digital signal processor (DSP) and programmable gate array for speed up processing.DSP is the serial processing structure, be good at the problem that solves space complexity, and FPGA is a parallel processing structure, is fit to the high problem of complexity settling time.But also do not have the ripe algorithm of a cover at present in order to solve the distribution of DSP and FPGA, the resource that also just can't reach FPGA and DSP is able to sufficient utilization.

Be used for military radio radar at present, because of the radio penetration power is strong, the air dielectric decay is little; So real-time is good, good stability, the distance accuracy that tests the speed all significantly improves; But if be used for civil area such as anti-collision system for automobile, need to solve the high speed processing of the digital signal of rear end, could form perfect test the speed in real time, find range, control, man-machine interface system; Must accomplish that in addition volume is little, cost is low, just can promote the use of.

(3) utility model content

The purpose of the utility model is a kind of linear frequency modulation continuous wave radar system of design; Adopt the bi-processor architecture of digital signal processor and programmable gate array; And designed the complicated rate average algorithm of space-time; Make full use of and reasonable distribution digital signal processor and programmable gate array, make the work of system high efficiency rate.

The linear frequency modulation continuous wave radar system of the utility model design comprises linear frequency modulation continuous wave radar information processing platform; This information processing platform comprises the dual processor that digital signal processor (DSP) and field programmable gate array (FPGA) connect to form; Digital to analog converter, low-converter, radio-frequency transmissions antenna, analog to digital converter, upconverter, radio frequency receiving antenna; The radio frequency receiving antenna inserts low-converter; Radiofrequency signal down-converts to intermediate-freuqncy signal; The output of low-converter transfers the input end that digital signal inserts field programmable gate array to through analog to digital converter, and the output terminal of field programmable gate array transfers simulating signal to through digital to analog converter and inserts upconverter, up-converts to radiofrequency signal and inserts the radio-frequency transmissions antenna.The field programmable gate array of the utility model contains Digital Down Convert unit, Digital Up Convert unit and information processing algorithm unit; The input end of Digital Down Convert unit is connected with analog to digital converter, output terminal access information Processing Algorithm unit; Digital medium-frequency signal is down-converted to digital baseband signal access information Processing Algorithm unit; The output terminal of the input end of Digital Up Convert unit and information processing algorithm unit joins, output terminal inserts digital to analog converter, digital baseband signal is up-converted to digital medium-frequency signal insert digital to analog converter.

Contain the complicated rate distribution module of space-time in the information processing algorithm unit of field programmable gate array; The information data that receives is carried out the complicated rate average algorithm of space-time earlier, various Radar Signal Processing algorithms is cut apart distributed to field programmable gate array or digital signal processor carries out computing.

Digital signal processor is connected to a random access memory (RAM), and field programmable gate array is connected to two random access memory (two RAM), and it is temporary to be used for data, to improve arithmetic speed.Two random access memory of field programmable gate array double than forms data buffer data handling capacity as the high speed ping-pong buffer, improve algorithm and carry out efficient.

In order to strengthen data throughput; Field programmable gate array is furnished with serial line interface and USB interface (USB) and common I/O (input and output) interface; Also increased pci bus (peripheral component interconnect bus) interface and optical fiber interface, these high-speed interface has guaranteed the continuity of real time data.

Can embed soft-core processor NIOS II in the field programmable gate array, NIOS II can be used as spare CPU, strengthens the FPGA interface function, as utilizes NIOS II to make built-in human-machine interaction interface etc.

Field programmable gate array connects host computer, and host computer is connected to man-machine interface.Field programmable gate array is equipped with flush bonding processor through said pci bus connection microcomputer or field programmable gate array, and microcomputer or flush bonding processor connect man-machine interface, also have serial line interface, USB interface and optical fiber interface.Microcomputer or flush bonding processor can connect warning device and/or automaton etc.

Field programmable gate array also is connected to CPLD (CPLD), is used for system encryption.

The continuous wave radar information processing platform of the linear frequency modulation continuous wave radar system of the utility model design is launched linear continuous wave and is received its echo; The radar information processing platform is to emission wave intensity, cycle; The intensity of echo, cycle, time of reception; Real time datas such as this radar movement velocity and position are carried out the computing of radar signal algorithm; The radar signal algorithm comprises that radar range finding algorithm, Doppler range rate measurement algorithm, pulse compression algorithm, target pairing algorithm, CFAR Processing Algorithm, matched filter algorithm, mirror image offset algorithm etc.; Obtain the position of the place ahead target and the real time data of speed, the real time data of relevant the place ahead target is sent into host computer and is shown the place ahead real-time pictures in man-machine interface, for the operator provides supplementary; Current square mesh target speed and when reaching warning value with the distance of set point also can start warning device or automaton.

The various algorithms that this radar information processing platform adopts the complicated rate distribution method of space-time will handle radar signal give digital signal processor respectively and field programmable gate array is accomplished, to make full use of dual processor.

Time complexity is the time length that metric algorithm is carried out; And space complexity is the size of the required storage space of metric algorithm.The complicated rate distribution method of space-time is the complicated rate of space-time with the time complexity of certain algorithm A of processing radar signal and the ratio Q of space complexity, confirms that by the Q value size of algorithm this algorithm A selects for use digital signal processor or field programmable gate array to handle.

The advantage of the utility model linear frequency modulation continuous wave radar system is: 1, adopt digital signal processor and field programmable gate array bi-processor architecture; And reasonably the Processing Algorithm of radar signal is distributed to the two by the complicated rate of space-time; Make full use of the advantage of FPGA and DSP, system works is smooth, efficient is high; 2, be furnished with host computer, form perfect test the speed in real time, find range, control, man-machine interface system, man-machine interface reflects the place ahead image, non-productive operation in real time, and can urgent report to the police constantly or the start-up control device to ensure safety; 3, two random access memory of field programmable gate array double than forms data buffer data handling capacity as the high speed ping-pong buffer, improve algorithm and carry out efficient; 4, field programmable gate array is furnished with serial line interface and USB interface, also has pci bus interface and optical fiber interface, strengthens data throughput, has guaranteed the continuity of real time data; 5, adopt the radar hardware platform of bi-processor architecture, satisfied the double requirements of data throughput and versatility, under the condition that guarantees safety and precision, reduce cost; 6, host computer can adopt FPGA to embed NIOS II soft-core processor as embedded human-machine interface simultaneously, under the prerequisite that guarantees the multiple functional characteristic of PC host computer, has increased the portable low power-consumption interface system.

(4) description of drawings

Fig. 1 is this linear frequency modulation continuous wave radar system example structure synoptic diagram.

(5) embodiment

Embodiment is as shown in Figure 1 for this linear frequency modulation continuous wave radar system; Comprise linear frequency modulation continuous wave radar information processing platform; This information processing platform comprises the dual processor that digital signal processor (DSP) and field programmable gate array (FPGA) connect to form; The radio frequency receiving antenna is through the input end of low-converter, analog to digital converter (A/D) access field programmable gate array, and the output terminal of field programmable gate array connects the radio-frequency transmissions antenna through digital to analog converter (D/A), upconverter.This routine field programmable gate array contains Digital Down Convert cells D DC, Digital Up Convert cells D UC and information processing algorithm unit; The input end of Digital Down Convert unit is connected with analog to digital converter, output terminal access information Processing Algorithm unit, and the output terminal of the input end of Digital Up Convert unit and information processing algorithm unit joins, output terminal inserts digital to analog converter.

Contain the complicated rate distribution module of space-time in the information processing algorithm unit of said field programmable gate array; The information data that receives is carried out the complicated rate average algorithm of space-time earlier, various Radar Signal Processing algorithms is cut apart distributed to field programmable gate array or digital signal processor carries out computing.

Digital signal processor is connected to a random access memory (RAM), field programmable gate array be connected to two random access memory (RAM2).

Field programmable gate array is furnished with serial line interface, USB interface, common I/O interface, and pci bus interface and optical fiber interface.

Field programmable gate array embeds soft-core processor NIOS II.

This routine field programmable gate array connects microcomputer as host computer through pci bus, and host computer is connected to man-machine interface and warning device, automaton.

The foregoing description is merely concrete example of purpose, technical scheme and beneficial effect further explain to the utility model, and the utility model is not to be defined in this.All any modifications of within the scope of disclosure of the utility model, being made, be equal to replacement, improvement etc., all be included within the protection domain of the utility model.

Claims

1. linear frequency modulation continuous wave radar system; Comprise linear frequency modulation continuous wave radar information processing platform; This information processing platform comprises the dual processor that digital signal processor and field programmable gate array connect to form; Digital to analog converter, low-converter, radio-frequency transmissions antenna, analog to digital converter, upconverter, radio frequency receiving antenna, the radio frequency receiving antenna inserts low-converter, and the output of low-converter inserts the input end of field programmable gate array through analog to digital converter; The output terminal of field programmable gate array inserts upconverter through digital to analog converter, inserts the radio-frequency transmissions antenna again; It is characterized in that:

Said field programmable gate array contains Digital Down Convert unit, Digital Up Convert unit and information processing algorithm unit; The input end of Digital Down Convert unit is connected with analog to digital converter, output terminal access information Processing Algorithm unit, and the output terminal of the input end of Digital Up Convert unit and information processing algorithm unit joins, output terminal inserts digital to analog converter;

Contain the complicated rate distribution module of space-time in the information processing algorithm unit of said field programmable gate array;

Said field programmable gate array is equipped with flush bonding processor through said pci bus connection microcomputer or field programmable gate array; Microcomputer or flush bonding processor connect man-machine interface as host computer, also connect warning device and/or automaton.