CN103675806B - A kind of radar ranging system - Google Patents
A kind of radar ranging system Download PDFInfo
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- CN103675806B CN103675806B CN201410008377.1A CN201410008377A CN103675806B CN 103675806 B CN103675806 B CN 103675806B CN 201410008377 A CN201410008377 A CN 201410008377A CN 103675806 B CN103675806 B CN 103675806B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
- G01S13/348—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal using square or rectangular modulation, e.g. diplex radar for ranging over short distances
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/35—Details of non-pulse systems
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Amplifiers (AREA)
Abstract
The present invention relates to a kind of radar ranging system.Its technical scheme is: one-chip computer module (2) is connected with modulation signal generation module (1), one-chip computer module (2) is connected with display module (3), one-chip computer module (2) is connected with serial communication interface (4), one-chip computer module (2) is connected with difference frequency signal conditioning module (5), modulation signal generation module (1) is connected with microwave remote sensor interface (6), and microwave remote sensor interface (6) is connected with difference frequency signal conditioning module (5); One-chip computer module is equipped with range finding control software design in (2).The present invention is controlled hardware by range finding control software design, have that cost is low, structure is simple, antijamming capability is strong, measuring accuracy is high and the feature of quick response, the measuring equipment being suitable as hand-held uses, and also can be embedded in large automatic system and use.
Description
Technical field
The invention belongs to electronic measuring technology field.Be specifically related to a kind of radar ranging system.
Background technology
At present, have the product of various radar range finding on the market, FMCW is frequency-modulated wave radar, and frequency-modulated wave radar range finding is different from conventional pulsating wave radar, mostly adopts the Digital Signal Analysis methods such as Fourier transform, wavelet analysis, instantaneous auto-correlation algorithm to realize.Its advantage is that circuit structure is simply clear, and project plan comparison is ripe; Shortcoming is that operand is large, and require high to the arithmetic capability of processor, operand can have influence on the power consumption of chip simultaneously, and require high to the time precision of signal sampling and amplitude precision, cost is also higher.Also there is portioned product to adopt program control narrow band filter to coordinate peak-holding circuit and AD sampling, namely by program control mimic channel, analysis of spectrum is carried out to signal and realize range finding.Advantage is technology maturation; Shortcoming is that antijamming capability is weak, components and parts aging very large on system accuracy impact, circuit structure is complicated, power consumption is large, poor real and cost very high.
Summary of the invention
The present invention is intended to overcome prior art defect, and object is to provide that a kind of cost is low, structure is simple, antijamming capability is strong, measuring accuracy is high and respond fast radar ranging system.
In order to complete above-mentioned purpose, the technical solution used in the present invention is: described system comprises modulation signal generation module, one-chip computer module, display module, serial communication interface, difference frequency signal conditioning module and microwave remote sensor interface.Output terminal PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF of one-chip computer module are corresponding with input end PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF of modulation signal generation module to be connected, and the input end SDO of one-chip computer module is connected with the output terminal SDO of modulation signal generation module; Output terminal RS, R/W, E, D0 of one-chip computer module ~ D7 and display module input end RS, R/W, E, D0 ~ D7 is corresponding connects, the two directions' inputing of one-chip computer module/output terminal RXD, TXD and serial communication interface two directions' inputing/output terminal TXD, RXD are corresponding connects, input end ADC_Sa, FdD of one-chip computer module are corresponding with output terminals A DC_Sa, the FdD of difference frequency signal conditioning module to be connected.The output terminal VOUT of modulation signal generation module is connected with the input end VOUT of microwave remote sensor interface, and the output terminal IF2 of microwave remote sensor interface is connected with the input end IF2 of difference frequency signal conditioning module.
Range finding control software design is housed in one-chip computer module.
Described modulation signal generation module comprises high precision digital-to-analog conversion U2 and interface P1.The pin 1 of the interface P1 of modulation signal generation module, pin 6 is all connected with power positive end AVDD, and the pin 8 of interface P1 and power supply in analog AGND are connected, the pin 3 of interface P1, pin 5, pin 7, pin 9, pin 11, pin 13, pin 15, pin 17, pin 19, pin 21, pin 23, pin 25, pin 27, pin 29, pin 31, pin 4 all with power supply digitally DGND be connected, the pin 44 of interface P1, pin 42, pin 40, the pin 11 of pin 38 and high precision digital-to-analog conversion U2, pin 9, pin 8, pin 7 correspondence connects, and the pin 42 of interface P1 is connected with one end of resistance R13, and the other end of resistance R13 is connected with the pin 40 of interface P1, the pin 34 of interface P1, pin 32, pin 30, pin 28, pin 26, pin 22, pin 20, pin 16, pin 14, pin 12, pin 6, the pin 3 of pin 4 and high precision digital-to-analog conversion U2, pin 2, pin 1, pin 23, pin 20, pin 15, pin 16, pin 19, pin 17, pin 18, pin 21, pin 22 correspondence connects, the pin 34 of interface P1, pin 32, pin 30, pin 28, pin 26, pin 22, pin 20, pin 16, pin 14, pin 12 and resistance R12, resistance R11, resistance R10, resistance R9, resistance R8, resistance R7, resistance R6, resistance R5, resistance R4, one end correspondence of resistance R3 connects, and the other end of resistance R12 ~ resistance R3 is all connected with the pin 6 of interface P1, the pin 8 of interface P1, pin 6, pin 4, the pin 4 of pin 2 and high precision digital-to-analog conversion U2, pin 5, pin 22, pin 24 correspondence connects.The pin 24 of high precision digital-to-analog conversion U2 is connected with one end of electric capacity C6, one end of electric capacity C7 respectively, the other end of electric capacity C6, electric capacity C7 all with power supply in analog AGND be connected, the pin 6 of high precision digital-to-analog conversion U2, pin 10 all with power supply in analog AGND be connected, the pin 21 of high precision digital-to-analog conversion U2 is connected with power positive end AVDD.
The pin 8 of high precision digital-to-analog conversion U2 is connected with the input end VOUT of microwave remote sensor interface; High precision digital-to-analog conversion U2 input end PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF is corresponding with output terminal PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF of one-chip computer module to be connected, and the pin 23 of high precision digital-to-analog conversion U2 is connected with the input end SDO of one-chip computer module.
Described one-chip computer module is based on single-chip microcomputer U1.The pin 5 of the single-chip microcomputer U1 of one-chip computer module respectively with power positive end AVDD, one end of electric capacity C1, one end of electric capacity C2 connects, the other end of electric capacity C1, the other end of electric capacity C2 all with power supply digitally DGND be connected, power positive end AVDD is connected with one end of resistance Ra, the other end of resistance Ra respectively with one end of resistance Rb, one end of electric capacity C3, connection terminal ExtVREF connects, the other end of resistance Rb, the other end of electric capacity C3 all with power supply digitally DGND be connected, the pin 27 of single-chip microcomputer U1, pin 26 is held with the GND of crystal oscillator Y1, OUT end is corresponding to be connected, the VCC end of crystal oscillator Y1 respectively with power positive end AVDD, one end of electric capacity C4, one end of electric capacity C5 connects, the other end of electric capacity C4, the other end of electric capacity C5, the GND end of crystal oscillator Y1 all with power supply digitally DGND be connected, the pin 40 of single-chip microcomputer U1 respectively with one end of resistance R1, one end of resistance R2 connects, and the other end of resistance R1 and power supply digitally DGND are connected, and the other end of resistance R2 is connected with power positive end AVDD.
Output terminal PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF of single-chip microcomputer U1 are corresponding with input end PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF of modulation signal generation module to be connected, and the input end SDO of single-chip microcomputer U1 is connected with the output terminal SDO of modulation signal generation module.Input end ADC_Sa, FdD of single-chip microcomputer U1 are corresponding with output terminals A DC_Sa, the FdD of difference frequency signal conditioning module to be connected; Output terminal RS, R/W, E, D0 of single-chip microcomputer U1 ~ D7 and display module input end RS, R/W, E, D0 ~ D7 is corresponding connects; The two directions' inputing of single-chip microcomputer U1/output terminal RXD, TXD and serial communication interface two directions' inputing/output terminal TXD, RXD are corresponding connects.
The circuit connecting mode of described difference frequency signal conditioning module is: connection terminal IF2 is connected with one end of electric capacity C8, the other end of electric capacity C8 is connected with the anode of low noise amplifier U3, one end of resistance R16 is connected with the anode of low noise amplifier U3, the other end of resistance R16 and power supply in analog AGND are connected, one end of resistance R15 and power supply in analog AGND are connected, the other end of resistance R15 is connected with the negative terminal of low noise amplifier U3, one end of resistance R17 is connected with the negative terminal of low noise amplifier U3, the other end of resistance R17 respectively with one end of resistance R18, one end of resistance R19 connects, the other end of resistance R18 and power supply in analog AGND are connected, the other end of resistance R19 respectively with the output terminal of low noise amplifier U3, one end of electric capacity C9 connects, the other end of electric capacity C9 respectively with one end of electric capacity C10, one end of resistance R20, one end of electric capacity C11 connects, the other end of resistance R20 and power supply in analog AGND are connected.
The other end of electric capacity C11 is connected with the output terminal of broad band amplifier U4-1, the other end of electric capacity C10 is connected with the negative terminal of broad band amplifier U4-1, one end of resistance R21 is connected with the negative terminal of broad band amplifier U4-1, the other end of resistance R21 is connected with the output terminal of broad band amplifier U4-1, the anode of broad band amplifier U4-1 and power supply in analog AGND are connected, one end of electric capacity C12 is connected with the output terminal of broad band amplifier U4-1, the other end of electric capacity C12 respectively with one end of electric capacity C14, one end of electric capacity C13, one end of resistance R23 connects, the other end of resistance R23 and power supply in analog AGND are connected.
The other end of electric capacity C14 is connected with the output terminal HPFout of broad band amplifier U4-2, the other end of electric capacity C13 is connected with the negative terminal of broad band amplifier U4-2, the anode of broad band amplifier U4-2 and power supply in analog AGND are connected, one end of resistance R22 is connected with the negative terminal of broad band amplifier U4-2, the other end of resistance R22 is connected with the output terminal HPFout of broad band amplifier U4-2, the output terminal HPFout of broad band amplifier U4-2 is connected with one end of resistance R24, and the other end of resistance R24 is connected with one end of resistance R26, one end of resistance R25, one end of electric capacity C15 respectively.
The other end of resistance R26 is connected with the output terminal of broad band amplifier U5-1, the other end of resistance R25 is connected with the negative terminal of broad band amplifier U5-1, the other end of electric capacity C15 and power supply in analog AGND are connected, one end of electric capacity C16 is connected with the negative terminal of broad band amplifier U5-1, the other end of electric capacity C16 is connected with the output terminal of broad band amplifier U5-1, the anode of broad band amplifier U5-1 and power supply in analog AGND are connected, the output terminal of broad band amplifier U5-1 is connected with one end of resistance R27, the other end of resistance R27 respectively with one end of resistance R29, one end of resistance R28, one end of electric capacity C17 connects.
The other end of resistance R29 is connected with the output terminal of broad band amplifier U5-2, the other end of resistance R28 is connected with the negative terminal of broad band amplifier U5-2, the other end of electric capacity C17 and power supply in analog AGND are connected, the anode of broad band amplifier U5-2 and power supply in analog AGND are connected, one end of electric capacity C18 is connected with the negative terminal of broad band amplifier U5-2, the other end of electric capacity C18 is connected with the output terminal of broad band amplifier U5-2, the anode of stabilivolt D2 is connected with the output terminal of broad band amplifier U5-2, the negative terminal of stabilivolt D2 respectively with one end of resistance R33, connection terminal ADC_Sa connects, the other end of resistance R33 and power supply in analog AGND are connected, one end of resistance R32 is connected with the output terminal of broad band amplifier U5-2, the other end of resistance R32 and power supply in analog AGND are connected.
The input end of voltage controlled gain controller U6 is connected with the output terminal of broad band amplifier U5-2, one end of potentiometer R30 is connected with power positive end AVDD, the intermediate ends of potentiometer R30 is held with the Gneg of voltage controlled gain controller U6 and is connected, the other end of potentiometer R30 and power supply in analog AGND are connected, the Gpos end of voltage controlled gain controller U6 respectively with one end of resistance R31, one end of electric capacity C19 connects, the other end of resistance R31 is connected with the negative terminal of stabilivolt D1, the other end of electric capacity C19 and power supply in analog AGND are connected, the anode of stabilivolt D1 is connected with the output terminal of voltage controlled gain controller U6.The negative terminal of height comparator U7 is connected with the anode of stabilivolt D1, the anode of height comparator U7 is connected with one end of resistance R34, one end of resistance R35 respectively, the other end of resistance R34 and power supply in analog AGND are connected, and the other end of resistance R35 is connected with the output terminal FdD of height comparator U7.
Connection terminal IF2 is connected with the output terminal IF2 of microwave remote sensor interface, and the output terminal FdD of connection terminal ADC_Sa, height comparator U7 is corresponding with input end ADC_Sa, FdD of one-chip computer module to be connected.
The main flow of described range finding control software design is:
S-101, beginning;
S-102, single-chip microcomputer U1 carry out initialization to peripheral hardware;
S-103, AD sampling is carried out to modulation signal, analyze;
S-104, to modulation signal correction;
S-105, AD sampling is carried out to difference frequency signal;
S-106, calculating relative power;
S-107, survey frequency;
S-108, lock difference frequency signal?
If S-109 locks, then perform S-110; If non-locking, then perform S-103;
S-110, calculating distance parameter;
S-111, display result of calculation, Serial output result of calculation;
S-112, execution S-105.
Owing to adopting technique scheme, the range finding control software design acting in conjunction of being equipped with in one-chip computer module of the present invention, modulation signal generation module, microwave remote sensor interface, difference frequency signal conditioning module, display module, serial communication interface and one-chip computer module.The producing method of modulation signal changes DAC into by general square wave integration, programming amplifying and direct current addition Buffer output and directly exports, and circuit structure is simplified; The program of modulation signal amplitude is simplified too, and measuring accuracy significantly improves, and real-time and reliability obviously strengthen.The present invention gives full play to the characteristic of sensor, adopts the method for Frequency-variable Modulation signal to realize high-precision distance measurement function, overcomes the difficult problem that difference frequency signal signal to noise ratio (S/N ratio) is low, eliminate the demand of system to high-speed floating point computing.Therefore improve measuring accuracy and reliability, and greatly simplifie system architecture.This system operations amount is little, precision is high, real-time, reliability is high, low in energy consumption, volume is little and antijamming capability is strong.
Therefore, the present invention has that cost is low, structure is simple, antijamming capability is strong, measuring accuracy is high and the feature of quick response, and the measuring equipment being suitable as hand-held uses, and also can be embedded in large automatic system and use.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is the circuit diagram of modulation signal generation module 1 in Fig. 1;
Fig. 3 is the circuit diagram of one-chip computer module 2 in Fig. 1;
Fig. 4 is the circuit diagram of difference frequency signal conditioning module 5 in Fig. 1;
Fig. 5 is the main flow figure of a kind of control software design of finding range of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described, the restriction not to protection domain:
A kind of radar ranging system.Described system as shown in Figure 1, comprises modulation signal generation module 1, one-chip computer module 2, display module 3, serial communication interface 4, difference frequency signal conditioning module 5 and microwave remote sensor interface 6.Output terminal PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF of one-chip computer module 2 are corresponding with input end PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF of modulation signal generation module 1 to be connected, and the input end SDO of one-chip computer module 2 is connected with the output terminal SDO of modulation signal generation module 1; Output terminal RS, R/W, E, D0 of one-chip computer module 2 ~ D7 and display module 3 input end RS, R/W, E, D0 ~ D7 is corresponding connects, the two directions' inputing of one-chip computer module 2/output terminal RXD, TXD and serial communication interface 4 two directions' inputing/output terminal TXD, RXD are corresponding connects, input end ADC_Sa, FdD of one-chip computer module 2 are corresponding with output terminals A DC_Sa, the FdD of difference frequency signal conditioning module 5 to be connected.The output terminal VOUT of modulation signal generation module 1 is connected with the input end VOUT of microwave remote sensor interface 6, and the output terminal IF2 of microwave remote sensor interface 6 is connected with the input end IF2 of difference frequency signal conditioning module 5.
Range finding control software design is housed in one-chip computer module 2.
Described modulation signal generation module 1 as shown in Figure 2, comprises high precision digital-to-analog conversion U2 and interface P1.The pin 1 of the interface P1 of modulation signal generation module 1, pin 6 is all connected with power positive end AVDD, and the pin 8 of interface P1 and power supply in analog AGND are connected, the pin 3 of interface P1, pin 5, pin 7, pin 9, pin 11, pin 13, pin 15, pin 17, pin 19, pin 21, pin 23, pin 25, pin 27, pin 29, pin 31, pin 4 all with power supply digitally DGND be connected, the pin 44 of interface P1, pin 42, pin 40, the pin 11 of pin 38 and high precision digital-to-analog conversion U2, pin 9, pin 8, pin 7 correspondence connects, and the pin 42 of interface P1 is connected with one end of resistance R13, and the other end of resistance R13 is connected with the pin 40 of interface P1, the pin 34 of interface P1, pin 32, pin 30, pin 28, pin 26, pin 22, pin 20, pin 16, pin 14, pin 12, pin 6, the pin 3 of pin 4 and high precision digital-to-analog conversion U2, pin 2, pin 1, pin 23, pin 20, pin 15, pin 16, pin 19, pin 17, pin 18, pin 21, pin 22 correspondence connects, the pin 34 of interface P1, pin 32, pin 30, pin 28, pin 26, pin 22, pin 20, pin 16, pin 14, pin 12 and resistance R12, resistance R11, resistance R10, resistance R9, resistance R8, resistance R7, resistance R6, resistance R5, resistance R4, one end correspondence of resistance R3 connects, and the other end of resistance R12 ~ resistance R3 is all connected with the pin 6 of interface P1, the pin 8 of interface P1, pin 6, pin 4, the pin 4 of pin 2 and high precision digital-to-analog conversion U2, pin 5, pin 22, pin 24 correspondence connects.The pin 24 of high precision digital-to-analog conversion U2 is connected with one end of electric capacity C6, one end of electric capacity C7 respectively, the other end of electric capacity C6, electric capacity C7 all with power supply in analog AGND be connected, the pin 6 of high precision digital-to-analog conversion U2, pin 10 all with power supply in analog AGND be connected, the pin 21 of high precision digital-to-analog conversion U2 is connected with power positive end AVDD.
The pin 8 of high precision digital-to-analog conversion U2 is connected with the input end VOUT of microwave remote sensor interface 6; High precision digital-to-analog conversion U2 input end PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF is corresponding with output terminal PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF of one-chip computer module 2 to be connected, and the pin 23 of high precision digital-to-analog conversion U2 is connected with the input end SDO of one-chip computer module 2.
As shown in Figure 3, described one-chip computer module 2 is based on single-chip microcomputer U1.The pin 5 of the single-chip microcomputer U1 of one-chip computer module 2 respectively with power positive end AVDD, one end of electric capacity C1, one end of electric capacity C2 connects, the other end of electric capacity C1, the other end of electric capacity C2 all with power supply digitally DGND be connected, power positive end AVDD is connected with one end of resistance Ra, the other end of resistance Ra respectively with one end of resistance Rb, one end of electric capacity C3, connection terminal ExtVREF connects, the other end of resistance Rb, the other end of electric capacity C3 all with power supply digitally DGND be connected, the pin 27 of single-chip microcomputer U1, pin 26 is held with the GND of crystal oscillator Y1, OUT end is corresponding to be connected, the VCC end of crystal oscillator Y1 respectively with power positive end AVDD, one end of electric capacity C4, one end of electric capacity C5 connects, the other end of electric capacity C4, the other end of electric capacity C5, the GND end of crystal oscillator Y1 all with power supply digitally DGND be connected, the pin 40 of single-chip microcomputer U1 respectively with one end of resistance R1, one end of resistance R2 connects, and the other end of resistance R1 and power supply digitally DGND are connected, and the other end of resistance R2 is connected with power positive end AVDD.
Output terminal PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF of single-chip microcomputer U1 are corresponding with input end PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF of modulation signal generation module 1 to be connected, and the input end SDO of single-chip microcomputer U1 is connected with the output terminal SDO of modulation signal generation module 1.Input end ADC_Sa, FdD of single-chip microcomputer U1 are corresponding with output terminals A DC_Sa, the FdD of difference frequency signal conditioning module 5 to be connected; Output terminal RS, R/W, E, D0 of single-chip microcomputer U1 ~ D7 and display module 3 input end RS, R/W, E, D0 ~ D7 is corresponding connects; The two directions' inputing of single-chip microcomputer U1/output terminal RXD, TXD and serial communication interface 4 two directions' inputing/output terminal TXD, RXD are corresponding connects.
The circuit connecting mode of described difference frequency signal conditioning module 5 is as shown in Figure 4: connection terminal IF2 is connected with one end of electric capacity C8, the other end of electric capacity C8 is connected with the anode of low noise amplifier U3, one end of resistance R16 is connected with the anode of low noise amplifier U3, the other end of resistance R16 and power supply in analog AGND are connected, one end of resistance R15 and power supply in analog AGND are connected, the other end of resistance R15 is connected with the negative terminal of low noise amplifier U3, one end of resistance R17 is connected with the negative terminal of low noise amplifier U3, the other end of resistance R17 respectively with one end of resistance R18, one end of resistance R19 connects, the other end of resistance R18 and power supply in analog AGND are connected, the other end of resistance R19 respectively with the output terminal of low noise amplifier U3, one end of electric capacity C9 connects, the other end of electric capacity C9 respectively with one end of electric capacity C10, one end of resistance R20, one end of electric capacity C11 connects, the other end of resistance R20 and power supply in analog AGND are connected.
The other end of electric capacity C11 is connected with the output terminal of broad band amplifier U4-1, the other end of electric capacity C10 is connected with the negative terminal of broad band amplifier U4-1, one end of resistance R21 is connected with the negative terminal of broad band amplifier U4-1, the other end of resistance R21 is connected with the output terminal of broad band amplifier U4-1, the anode of broad band amplifier U4-1 and power supply in analog AGND are connected, one end of electric capacity C12 is connected with the output terminal of broad band amplifier U4-1, the other end of electric capacity C12 respectively with one end of electric capacity C14, one end of electric capacity C13, one end of resistance R23 connects, the other end of resistance R23 and power supply in analog AGND are connected.
The other end of electric capacity C14 is connected with the output terminal HPFout of broad band amplifier U4-2, the other end of electric capacity C13 is connected with the negative terminal of broad band amplifier U4-2, the anode of broad band amplifier U4-2 and power supply in analog AGND are connected, one end of resistance R22 is connected with the negative terminal of broad band amplifier U4-2, the other end of resistance R22 is connected with the output terminal HPFout of broad band amplifier U4-2, the output terminal HPFout of broad band amplifier U4-2 is connected with one end of resistance R24, and the other end of resistance R24 is connected with one end of resistance R26, one end of resistance R25, one end of electric capacity C15 respectively.
The other end of resistance R26 is connected with the output terminal of broad band amplifier U5-1, the other end of resistance R25 is connected with the negative terminal of broad band amplifier U5-1, the other end of electric capacity C15 and power supply in analog AGND are connected, one end of electric capacity C16 is connected with the negative terminal of broad band amplifier U5-1, the other end of electric capacity C16 is connected with the output terminal of broad band amplifier U5-1, the anode of broad band amplifier U5-1 and power supply in analog AGND are connected, the output terminal of broad band amplifier U5-1 is connected with one end of resistance R27, the other end of resistance R27 respectively with one end of resistance R29, one end of resistance R28, one end of electric capacity C17 connects.
The other end of resistance R29 is connected with the output terminal of broad band amplifier U5-2, the other end of resistance R28 is connected with the negative terminal of broad band amplifier U5-2, the other end of electric capacity C17 and power supply in analog AGND are connected, the anode of broad band amplifier U5-2 and power supply in analog AGND are connected, one end of electric capacity C18 is connected with the negative terminal of broad band amplifier U5-2, the other end of electric capacity C18 is connected with the output terminal of broad band amplifier U5-2, the anode of stabilivolt D2 is connected with the output terminal of broad band amplifier U5-2, the negative terminal of stabilivolt D2 respectively with one end of resistance R33, connection terminal ADC_Sa connects, the other end of resistance R33 and power supply in analog AGND are connected, one end of resistance R32 is connected with the output terminal of broad band amplifier U5-2, the other end of resistance R32 and power supply in analog AGND are connected.
The input end of voltage controlled gain controller U6 is connected with the output terminal of broad band amplifier U5-2, one end of potentiometer R30 is connected with power positive end AVDD, the intermediate ends of potentiometer R30 is held with the Gneg of voltage controlled gain controller U6 and is connected, the other end of potentiometer R30 and power supply in analog AGND are connected, the Gpos end of voltage controlled gain controller U6 respectively with one end of resistance R31, one end of electric capacity C19 connects, the other end of resistance R31 is connected with the negative terminal of stabilivolt D1, the other end of electric capacity C19 and power supply in analog AGND are connected, the anode of stabilivolt D1 is connected with the output terminal of voltage controlled gain controller U6.The negative terminal of height comparator U7 is connected with the anode of stabilivolt D1, the anode of height comparator U7 is connected with one end of resistance R34, one end of resistance R35 respectively, the other end of resistance R34 and power supply in analog AGND are connected, and the other end of resistance R35 is connected with the output terminal FdD of height comparator U7.
Connection terminal IF2 is connected with the output terminal IF2 of microwave remote sensor interface 6, and the output terminal FdD of connection terminal ADC_Sa, height comparator U7 is corresponding with input end ADC_Sa, FdD of one-chip computer module 2 to be connected.
As shown in Figure 5, the main flow of described range finding control software design is:
S-101, beginning;
S-102, single-chip microcomputer U1 carry out initialization to peripheral hardware;
S-103, AD sampling is carried out to modulation signal, analyze;
S-104, to modulation signal correction;
S-105, AD sampling is carried out to difference frequency signal;
S-106, calculating relative power;
S-107, survey frequency;
S-108, lock difference frequency signal?
If S-109 locks, then perform S-110; If non-locking, then perform S-103;
S-110, calculating distance parameter;
S-111, display result of calculation, Serial output result of calculation;
S-112, execution S-105.
The range finding control software design acting in conjunction of being equipped with in the one-chip computer module 2 of this embodiment, modulation signal generation module 1, microwave remote sensor interface 6, difference frequency signal conditioning module 5, display module 3, serial communication interface 4 and one-chip computer module 2.The producing method of modulation signal changes DAC into by general square wave integration, programming amplifying and direct current addition Buffer output and directly exports, and circuit structure is simplified; The program of modulation signal amplitude is simplified too, and measuring accuracy significantly improves, and real-time and reliability obviously strengthen.This embodiment gives full play to the characteristic of sensor, adopts the method for Frequency-variable Modulation signal to realize high-precision distance measurement function, overcomes the difficult problem that difference frequency signal signal to noise ratio (S/N ratio) is low, eliminate the demand of system to high-speed floating point computing.Therefore improve measuring accuracy and reliability, and greatly simplifie system architecture.This system operations amount is little, precision is high, real-time, reliability is high, low in energy consumption, volume is little and antijamming capability is strong.
Therefore, this embodiment has that cost is low, structure is simple, antijamming capability is strong, measuring accuracy is high and the feature of quick response, and the measuring equipment being suitable as hand-held uses, and also can be embedded in large automatic system and use.
Claims (5)
1. a radar ranging system, is characterized in that described system comprises modulation signal generation module (1), one-chip computer module (2), display module (3), serial communication interface (4), difference frequency signal conditioning module (5) and microwave remote sensor interface (6), the output terminal PDN of one-chip computer module (2), RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, the input end PDN of ExtVREF and modulation signal generation module (1), RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF correspondence connects, and the input end SDO of one-chip computer module (2) is connected with the output terminal SDO of modulation signal generation module (1), the output terminal RS of one-chip computer module (2), R/W, E, the input end RS of D0 ~ D7 and display module (3), R/W, E, D0 ~ D7 correspondence connects, the two directions' inputing/output terminal RXD of one-chip computer module (2), two directions' inputing/output terminal the TXD of TXD and serial communication interface (4), RXD correspondence connects, the input end ADC_Sa of one-chip computer module (2), the output terminals A DC_Sa of FdD and difference frequency signal conditioning module (5), FdD correspondence connects, the output terminal VOUT of modulation signal generation module (1) is connected with the input end VOUT of microwave remote sensor interface (6), and the output terminal IF2 of microwave remote sensor interface (6) is connected with the input end IF2 of difference frequency signal conditioning module (5),
One-chip computer module is equipped with range finding control software design in (2).
2. radar ranging system according to claim 1, is characterized in that described modulation signal generation module (1) comprises high precision digital-to-analog conversion U2 and interface P1, the pin 1 of the interface P1 of modulation signal generation module (1), pin 6 is all connected with power positive end AVDD, and the pin 8 of interface P1 and power supply in analog AGND are connected, the pin 3 of interface P1, pin 5, pin 7, pin 9, pin 11, pin 13, pin 15, pin 17, pin 19, pin 21, pin 23, pin 25, pin 27, pin 29, pin 31, pin 4 all with power supply digitally DGND be connected, the pin 44 of interface P1, pin 42, pin 40, the pin 11 of pin 38 and high precision digital-to-analog conversion U2, pin 9, pin 8, pin 7 correspondence connects, and the pin 42 of interface P1 is connected with one end of resistance R13, and the other end of resistance R13 is connected with the pin 40 of interface P1, the pin 34 of interface P1, pin 32, pin 30, pin 28, pin 26, pin 22, pin 20, pin 16, pin 14, pin 12, pin 6, the pin 3 of pin 4 and high precision digital-to-analog conversion U2, pin 2, pin 1, pin 23, pin 20, pin 15, pin 16, pin 19, pin 17, pin 18, pin 21, pin 22 correspondence connects, the pin 34 of interface P1, pin 32, pin 30, pin 28, pin 26, pin 22, pin 20, pin 16, pin 14, pin 12 and resistance R12, resistance R11, resistance R10, resistance R9, resistance R8, resistance R7, resistance R6, resistance R5, resistance R4, one end correspondence of resistance R3 connects, and the other end of resistance R12 ~ resistance R3 is all connected with the pin 6 of interface P1, the pin 8 of interface P1, pin 6, pin 4, the pin 4 of pin 2 and high precision digital-to-analog conversion U2, pin 5, pin 22, pin 24 correspondence connects, the pin 24 of high precision digital-to-analog conversion U2 is connected with one end of electric capacity C6, one end of electric capacity C7 respectively, the other end of electric capacity C6, electric capacity C7 all with power supply in analog AGND be connected, the pin 6 of high precision digital-to-analog conversion U2, pin 10 all with power supply in analog AGND be connected, the pin 21 of high precision digital-to-analog conversion U2 is connected with power positive end AVDD,
The pin 8 of high precision digital-to-analog conversion U2 is connected with the input end VOUT of microwave remote sensor interface (6); High precision digital-to-analog conversion U2 input end PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF and monolithic
Output terminal PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF correspondence of machine module (2) connects, and the pin 23 of high precision digital-to-analog conversion U2 is connected with the input end SDO of one-chip computer module (2).
3. radar ranging system according to claim 1, is characterized in that described one-chip computer module (2) is based on single-chip microcomputer U1, the pin 5 of the single-chip microcomputer U1 of one-chip computer module (2) respectively with power positive end AVDD, one end of electric capacity C1, one end of electric capacity C2 connects, the other end of electric capacity C1, the other end of electric capacity C2 all with power supply digitally DGND be connected, power positive end AVDD is connected with one end of resistance Ra, the other end of resistance Ra respectively with one end of resistance Rb, one end of electric capacity C3, connection terminal ExtVREF connects, the other end of resistance Rb, the other end of electric capacity C3 all with power supply digitally DGND be connected, the pin 27 of single-chip microcomputer U1, pin 26 is held with the GND of crystal oscillator Y1, OUT end is corresponding to be connected, the VCC end of crystal oscillator Y1 respectively with power positive end AVDD, one end of electric capacity C4, one end of electric capacity C5 connects, the other end of electric capacity C4, the other end of electric capacity C5, the GND end of crystal oscillator Y1 all with power supply digitally DGND be connected, the pin 40 of single-chip microcomputer U1 respectively with one end of resistance R1, one end of resistance R2 connects, and the other end of resistance R1 and power supply digitally DGND are connected, and the other end of resistance R2 is connected with power positive end AVDD,
Output terminal PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF of single-chip microcomputer U1 are corresponding with input end PDN, RST, CS, USB/BTC, SDOSEL, SCLK, SDI, LDAC, ExtVREF of modulation signal generation module (1) to be connected, and the input end SDO of single-chip microcomputer U1 is connected with the output terminal SDO of modulation signal generation module (1); Input end ADC_Sa, FdD of single-chip microcomputer U1 are corresponding with output terminals A DC_Sa, the FdD of difference frequency signal conditioning module (5) to be connected, output terminal RS, R/W, E, D0 of single-chip microcomputer U1 ~ D7 and display module (3) input end RS, R/W, E, D0 ~ D7 is corresponding connects, the two directions' inputing of single-chip microcomputer U1/output terminal RXD, TXD and serial communication interface (4) two directions' inputing/output terminal TXD, RXD are corresponding connects.
4. radar ranging system according to claim 1, it is characterized in that the circuit connecting mode of described difference frequency signal conditioning module (5) is: connection terminal IF2 is connected with one end of electric capacity C8, the other end of electric capacity C8 is connected with the anode of low noise amplifier U3, one end of resistance R16 is connected with the anode of low noise amplifier U3, the other end of resistance R16 and power supply in analog AGND are connected, one end of resistance R15 and power supply in analog AGND are connected, the other end of resistance R15 is connected with the negative terminal of low noise amplifier U3, one end of resistance R17 is connected with the negative terminal of low noise amplifier U3, the other end of resistance R17 respectively with one end of resistance R18, one end of resistance R19 connects, the other end of resistance R18 and power supply in analog AGND are connected, the other end of resistance R19 respectively with the output terminal of low noise amplifier U3, one end of electric capacity C9 connects, the other end of electric capacity C9 respectively with one end of electric capacity C10, one end of resistance R20, one end of electric capacity C11 connects, the other end of resistance R20 and power supply in analog AGND are connected, the other end of electric capacity C11 is connected with the output terminal of broad band amplifier U4-1, the other end of electric capacity C10 is connected with the negative terminal of broad band amplifier U4-1, one end of resistance R21 is connected with the negative terminal of broad band amplifier U4-1, the other end of resistance R21 is connected with the output terminal of broad band amplifier U4-1, the anode of broad band amplifier U4-1 and power supply in analog AGND are connected, one end of electric capacity C12 is connected with the output terminal of broad band amplifier U4-1, the other end of electric capacity C12 respectively with one end of electric capacity C14, one end of electric capacity C13, one end of resistance R23 connects, the other end of resistance R23 and power supply in analog AGND are connected,
The other end of electric capacity C14 is connected with the output terminal HPFout of broad band amplifier U4-2, the other end of electric capacity C13 is connected with the negative terminal of broad band amplifier U4-2, the anode of broad band amplifier U4-2 and power supply in analog AGND are connected, one end of resistance R22 is connected with the negative terminal of broad band amplifier U4-2, the other end of resistance R22 is connected with the output terminal HPFout of broad band amplifier U4-2, the output terminal HPFout of broad band amplifier U4-2 is connected with one end of resistance R24, and the other end of resistance R24 is connected with one end of resistance R26, one end of resistance R25, one end of electric capacity C15 respectively;
The other end of resistance R26 is connected with the output terminal of broad band amplifier U5-1, the other end of resistance R25 is connected with the negative terminal of broad band amplifier U5-1, the other end of electric capacity C15 and power supply in analog AGND are connected, one end of electric capacity C16 is connected with the negative terminal of broad band amplifier U5-1, the other end of electric capacity C16 is connected with the output terminal of broad band amplifier U5-1, the anode of broad band amplifier U5-1 and power supply in analog AGND are connected, the output terminal of broad band amplifier U5-1 is connected with one end of resistance R27, the other end of resistance R27 respectively with one end of resistance R29, one end of resistance R28, one end of electric capacity C17 connects,
The other end of resistance R29 is connected with the output terminal of broad band amplifier U5-2, the other end of resistance R28 is connected with the negative terminal of broad band amplifier U5-2, the other end of electric capacity C17 and power supply in analog AGND are connected, the anode of broad band amplifier U5-2 and power supply in analog AGND are connected, one end of electric capacity C18 is connected with the negative terminal of broad band amplifier U5-2, the other end of electric capacity C18 is connected with the output terminal of broad band amplifier U5-2, the anode of stabilivolt D2 is connected with the output terminal of broad band amplifier U5-2, the negative terminal of stabilivolt D2 respectively with one end of resistance R33, connection terminal ADC_Sa connects, the other end of resistance R33 and power supply in analog AGND are connected, one end of resistance R32 is connected with the output terminal of broad band amplifier U5-2, the other end of resistance R32 and power supply in analog AGND are connected,
The input end of voltage controlled gain controller U6 is connected with the output terminal of broad band amplifier U5-2, one end of potentiometer R30 is connected with power positive end AVDD, the intermediate ends of potentiometer R30 is held with the Gneg of voltage controlled gain controller U6 and is connected, the other end of potentiometer R30 and power supply in analog AGND are connected, the Gpos end of voltage controlled gain controller U6 respectively with one end of resistance R31, one end of electric capacity C19 connects, the other end of resistance R31 is connected with the negative terminal of stabilivolt D1, the other end of electric capacity C19 and power supply in analog AGND are connected, the anode of stabilivolt D1 is connected with the output terminal of voltage controlled gain controller U6, the negative terminal of height comparator U7 is connected with the anode of stabilivolt D1, the anode of height comparator U7 respectively with one end of resistance R34, one end of resistance R35 connects, the other end of resistance R34 and power supply in analog AGND are connected, the other end of resistance R35 is connected with the output terminal FdD of height comparator U7,
Connection terminal IF2 is connected with the output terminal IF2 of microwave remote sensor interface (6), and the output terminal FdD of connection terminal ADC_Sa, height comparator U7 is corresponding with input end ADC_Sa, FdD of one-chip computer module (2) to be connected.
5. radar ranging system according to claim 1, is characterized in that the main flow of described range finding control software design is:
S-101, beginning;
S-102, single-chip microcomputer U1 carry out initialization to peripheral hardware;
S-103, AD sampling is carried out to modulation signal, analyze;
S-104, to modulation signal correction;
S-105, AD sampling is carried out to difference frequency signal;
S-106, calculating relative power;
S-107, survey frequency;
S-108, whether lock difference frequency signal;
If S-109 locks, then perform S-110; If non-locking, then perform S-103;
S-110, calculating distance parameter;
S-111, display result of calculation, Serial output result of calculation;
S-112, execution S-105.
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