CN206331109U - A kind of radar range finding circuit - Google Patents
A kind of radar range finding circuit Download PDFInfo
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- CN206331109U CN206331109U CN201621361675.XU CN201621361675U CN206331109U CN 206331109 U CN206331109 U CN 206331109U CN 201621361675 U CN201621361675 U CN 201621361675U CN 206331109 U CN206331109 U CN 206331109U
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Abstract
A kind of radar range finding circuit, including simulated modulation plate, digital core core, power supply and external interface board, display and keypad, the simulated modulation plate output end connects radar antenna, simulated modulation plate input connects digital core core, digital core core input connection power supply and external interface board and display and keypad.So as to realize the processing of radar intermediate frequency signal, distance resolve, display, set, the function such as external interface and power supply, circuit uses modularized design thinking, with range is big, high precision, strong antijamming capability, function and the characteristics of complete external interface.
Description
Technical field
The utility model is related to a kind of radar range finding circuit.
Background technology
Radar is a kind of complicated Radio Test Equipment of high-precision high-reliability, available for ranging, tests the speed or measures three-dimensional
Imaging etc..There is important application in military affairs, space flight navigation, commercial measurement and the traffic field such as test the speed, particularly in some strong corruption
Commercial measurement occasion under the adverse circumstances such as erosion, high humidity, many dust, radar non-cpntact measurements more other than laser, ultrasonic wave etc.
Equipment has a clear superiority, such as large-scale coal bunker, bunker, the level gauging in dregs of rice storehouse, and its range is big, and bad environments, dust are more, dry
Disturb source complicated, at this moment it must be measured with large range high precision radar, the equipment such as conventional laser is right because dust is more
The scattering and interference of light are big, it is difficult to accomplish wide range accurate measurement, and radar is then the ideal equipment for solving this problem.At present,
The high-precision great Cheng radars of industrial thing position level gauging under the adverse circumstances such as deep-etching, high humidity, many dust are external
Import, such as Siemens, Cologne etc..It is domestic commonly to use single single-chip microcomputer or DSP processing in terms of commercial measurement radar at present
Device framework, this is unfavorable to generating high-quality modulated signal；I the or Q roads intermediate frequency exported simultaneously in processor radar antenna
Only take and wherein handled all the way during signal, be so difficult to ensure in whole measure scope the precision of measurement；In terms of filtering
Also do badly, particularly telemeasurement when, radar antenna leakage modulating wave easily flood useful signal cause measurement miss
Difference increase, range diminishes.
Utility model content
Its purpose of the utility model is that a kind of radar range finding circuit of offer, so as to realize the place of radar intermediate frequency signal
Reason, distance are resolved, display, set, the function such as external interface and power supply, circuit uses modularized design thinking, with range it is big,
The characteristics of high precision, strong antijamming capability, function and complete external interface.
The technical scheme realized above-mentioned purpose and taken, including simulated modulation plate, digital core core, power supply and external interface
Plate, display and keypad, it is characterised in that the simulated modulation plate output end connects radar antenna, simulated modulation plate input
Connect digital core core, digital core core input connection power supply and external interface board and display and keypad；
Described simulated modulation plate, the filtering of the I and Q two-way intermediate-freuqncy signals at least exported including radar antenna and AD conversion
Module, produce radar antenna modulated signal DA translation filterings and follower module, temperature-measuring module, HART communication module and
Ultralow ripple power supplies module；Described intermediate-freuqncy signal filtering includes quadravalence high-pass filtering and second-order low-pass filter, wherein, I roads are high
The cut-off frequency of bandpass filter is set to 10 times of frequency modulating signal, and the cut-off frequency of Q roads high-pass filter is set to modulated signal
2 times of frequency, the gain of high-pass filter uses Capacity control mode, and voltage has uniformly biased 2.5V, LPF in order to
Prevent signal amplitude excessive and distortion, using passive low-pass filter mode, cut-off frequency is set to the 1.5 of intermediate-freuqncy signal highest frequency
Times；AD conversion module is using the converter of 16 SPI interfaces of ADI companies, highest sampling rate 1MHZ；Described DA conversions
Filtering and follower module are used for producing the modulated-analog signal needed for radar antenna, and DA conversions use 16 SPI of ADI companies
The converter of interface, small-sized SO-8 encapsulation is filtered into the passive second order filter of a low pass, and cut-off frequency is 2 times of DA conversion ratios,
To eliminate the influence for the high frequency staircase waveform that DA transfer zones come, follower includes a gain of same phase 0 being made up of operational amplifier
Circuit, the driving force for improving DA outputs；Described temperature-measuring module uses DS18B20, to instrumentation radar antenna
The real time temperature of front end, so as to compensate the non-linear of the antenna VCO due to temperature band；Described HART communication module is mainly used
To produce 4 ~ 20mA electric currents of industrial standard, the acp chip used, for AD421, is a DA conversion chips；Described is ultralow
Ripple power supplies module is mainly used to be supplied to the high-quality 5V power supplys of radar antenna and analog circuit, and the power supply chip used is TI
A chip of the QFN-16 encapsulation of the TPS74 series of company, maximum output current is 1A, and minimum ripple is up to uV grades；
Described digital core core, at least including fpga logic array module, DSP digital processor modules and DC-DC electricity
Source modular converter, described fpga logic array module is ALTERA companies CYCLONE II series EP2C types FPGA battle array
Row, packing forms are FBGA-256, realize modulated signal DA output controls, I, Q and the road signal of modulated signal three AD collection and
Control, temperature are read, HART and RS485 Communication Controls and the communication function between DSP digital signal processing modules, wherein DA, AD and
HART controls are realized by three-wire type SPI interface, and RS485 communications are realized using MAX3485 protocol chips and light-coupled isolation；
Described DSP digital processor modules are a floating point DSP the chip serial C6000 of TI companies, while extending out data
Memory storage SDRAM and program storage FLASH, its function are that the AD sampled datas sent to FPGA carry out fast Fourier FFT
Calculate, so as to obtain distance results and result is passed back to FPGA；
Described power supply and external interface board, at least turns DC24V modules and AC220V, DC24V including AC220V and cuts automatically
Mold changing block, 24V turn 5V DC-DC modules and HART interfaces, RS485 interfaces, three external interfaces of power interface, described
AC220V, which turns DC24V modules, includes EMC modules and AC-DC module, and EMC modules are a electromagnetic compatibility mould of Jin Shengyang companies
Block, model FC-LX1D, AC-DC module is that a exchange of Jin Shengyang companies LH25 series turns direct-current switch power supply module,
The 220V exchanges of input are transformed into 24V direct currents, and peak power output reaches 25W；Described AC220V, DC24V automatic switching module
It is not more than 0.4V diode including at least two conducting voltages, for from AC220V, DC24V two-way voltage automatic optional one
Road is exported as last 24V；Described 24V turns 5V DC-DC modules and is mainly used in 24V to be converted into 5V, main devices
For the LM2576 switching power source chips of TI companies, maximum output current is up to 3A；Described HART interfaces, RS485 interfaces for pair
User communication interface, power interface provides two kinds of control sources of AC220V and DC24V simultaneously；
Described display and keypad, at least including a LCDs, function key, up key, down key, acknowledgement key
The single-chip microcomputer of four buttons and a TMS32 series, single-chip microcomputer by FPGA is sent to display control and by serial mode reception
The result data to be shown come, while the configuration parameter information by key-press input is sent to FPGA by serial ports.
Beneficial effect
The utility model has advantages below compared with prior art.
1st, modularized design, analog circuit board, digital circuit board, display board, power supply and interface board are separately designed and installed,
Greatly enhance circuit anti-interference ability, convenient maintenance and debugging；
2nd, circuit is complete, multiple functional：The full functional circuits such as measurement, display, input setting, power supply, user interface are provided；
3rd, strong antijamming capability, circuit can effectively filter out the various interference that environment and radar antenna are brought in itself；
4th, range is big, and maximum range is up to 150 meters；
5th, high precision, better than the 0.8% of full scale.
Brief description of the drawings
The utility model is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is that circuit of the present utility model is constituted and logical schematic.
Embodiment
The present apparatus includes simulated modulation plate, digital core core, power supply and external interface board, display and keypad, such as Fig. 1 institutes
Show, the simulated modulation plate output end connects radar antenna, simulated modulation plate input connection digital core core, digital core core
Input connects power supply and external interface board and display and keypad；
Described simulated modulation plate, the filtering of the I and Q two-way intermediate-freuqncy signals at least exported including radar antenna and AD conversion
Module, produce radar antenna modulated signal DA translation filterings and follower module, temperature-measuring module, HART communication module and
Ultralow ripple power supplies module；Described intermediate-freuqncy signal filtering includes quadravalence high-pass filtering and second-order low-pass filter, wherein, I roads are high
The cut-off frequency of bandpass filter is set to 10 times of frequency modulating signal, and the cut-off frequency of Q roads high-pass filter is set to modulated signal
2 times of frequency, the gain of high-pass filter uses Capacity control mode, and voltage has uniformly biased 2.5V, LPF in order to
Prevent signal amplitude excessive and distortion, using passive low-pass filter mode, cut-off frequency is set to the 1.5 of intermediate-freuqncy signal highest frequency
Times；AD conversion module is using the converter of 16 SPI interfaces of ADI companies, highest sampling rate 1MHZ；Described DA conversions
Filtering and follower module are used for producing the modulated-analog signal needed for radar antenna, and DA conversions use 16 SPI of ADI companies
The converter of interface, small-sized SO-8 encapsulation is filtered into the passive second order filter of a low pass, and cut-off frequency is 2 times of DA conversion ratios,
To eliminate the influence for the high frequency staircase waveform that DA transfer zones come, follower includes a gain of same phase 0 being made up of operational amplifier
Circuit, the driving force for improving DA outputs；Described temperature-measuring module uses DS18B20, to instrumentation radar antenna
The real time temperature of front end, so as to compensate the non-linear of the antenna VCO due to temperature band；Described HART communication module is mainly used
To produce 4 ~ 20mA electric currents of industrial standard, the acp chip used, for AD421, is a DA conversion chips；Described is ultralow
Ripple power supplies module is mainly used to be supplied to the high-quality 5V power supplys of radar antenna and analog circuit, and the power supply chip used is TI
A chip of the QFN-16 encapsulation of the TPS74 series of company, maximum output current is 1A, and minimum ripple is up to uV grades；
Described digital core core, at least including fpga logic array module, DSP digital processor modules and DC-DC electricity
Source modular converter, described fpga logic array module is ALTERA companies CYCLONE II series EP2C types FPGA battle array
Row, packing forms are FBGA-256, realize modulated signal DA output controls, I, Q and the road signal of modulated signal three AD collection and
Control, temperature are read, HART and RS485 Communication Controls and the communication function between DSP digital signal processing modules, wherein DA, AD and
HART controls are realized by three-wire type SPI interface, and RS485 communications are realized using MAX3485 protocol chips and light-coupled isolation；
Described DSP digital processor modules are a floating point DSP the chip serial C6000 of TI companies, while extending out data
Memory storage SDRAM and program storage FLASH, its function are that the AD sampled datas sent to FPGA carry out fast Fourier FFT
Calculate, so as to obtain distance results and result is passed back to FPGA；
Described power supply and external interface board, at least turns DC24V modules and AC220V, DC24V including AC220V and cuts automatically
Mold changing block, 24V turn 5V DC-DC modules and HART interfaces, RS485 interfaces, three external interfaces of power interface, described
AC220V, which turns DC24V modules, includes EMC modules and AC-DC module, and EMC modules are a electromagnetic compatibility mould of Jin Shengyang companies
Block, model FC-LX1D, AC-DC module is that a exchange of Jin Shengyang companies LH25 series turns direct-current switch power supply module,
The 220V exchanges of input are transformed into 24V direct currents, and peak power output reaches 25W；Described AC220V, DC24V automatic switching module
It is not more than 0.4V diode including at least two conducting voltages, for from AC220V, DC24V two-way voltage automatic optional one
Road is exported as last 24V；Described 24V turns 5V DC-DC modules and is mainly used in 24V to be converted into 5V, main devices
For the LM2576 switching power source chips of TI companies, maximum output current is up to 3A；Described HART interfaces, RS485 interfaces for pair
User communication interface, power interface provides two kinds of control sources of AC220V and DC24V simultaneously；
Described display and keypad, at least including a LCDs, function key, up key, down key, acknowledgement key
The single-chip microcomputer of four buttons and a TMS32 series, single-chip microcomputer by FPGA is sent to display control and by serial mode reception
The result data to be shown come, while the configuration parameter information by key-press input is sent to FPGA by serial ports.
As shown in figure 1, the present apparatus include radar antenna, simulated modulation plate, digital core core, power supply and external interface board,
Display and keypad, external AC 220V or DC24V power supply.
Radar antenna is connected with simulated modulation plate, and simulated modulation plate, digital core core, power supply and external interface
Power supply and connection are connected between the plate of plate, display and keypad, to power panel power input interface for AC220V or DC24V electricity
Source.
After all circuits are connected and are powered, the fpga logic array module in digital core core gives simulated modulation first
The D/A converter of plate sends DA output control orders by SPI interface to it, exportable after follower is involved by low pass filtered
The adjustable triangular modulation signal Vt of frequency and amplitude of standard simultaneously inputs to radar antenna, radar antenna front end modulated signal
After Vt continuous modulation, its tranmitting frequency changes with Vt change, and its centre frequency is 24GHZ, and bandwidth is about 300MHZ, when
When radar antenna transmission signal is in approximate 90 degree of relations with measured object, now the exportable I and Q two-way of radar antenna includes distance and believed
The intermediate-freuqncy signal of breath, tested distance is bigger, and IF signal frequency is higher.Intermediate-freuqncy signal is inputted to simulated modulation plate, simulation is adjusted
Reason plate is filtered to the leakage of triangular modulation signal contained in intermediate-freuqncy signal and environmental disturbances clutter, then carries out AD turns
Change, and fpga logic array module is given the data signal after AD conversion by SPI interface, fpga logic array module is to I
It is read out with the AD conversion result of Q two-way intermediate-freuqncy signals and DSP digital processing units, DSP numerals is sent to by internal FIFO
Processor carries out FFT spectrum analysis and computing to the data sent and draws distance value corresponding with spectral line peak value, then away from
FPGA is passed back to from value.On the one hand FPGA gives display board distance value and is shown, on the one hand distance value is changed simultaneously
The HART modules on simulated modulation plate are controlled, output 4 ~ 20mA standard current signals are to HART interfaces, while distance value is passed through
RS485 interfaces are sent to user terminal, so as to realize the functions such as the measurement and display of distance.
Claims (1)
1. a kind of radar range finding circuit, including simulated modulation plate, digital core core, power supply and external interface board, display and button
Plate, it is characterised in that the simulated modulation plate output end connects radar antenna, simulated modulation plate input connection digital core
Plate, digital core core input connection power supply and external interface board and display and keypad；
Described simulated modulation plate, the filtering of the I and Q two-way intermediate-freuqncy signals at least exported including radar antenna and AD conversion mould
Block, the DA translation filterings and follower module that produce radar antenna modulated signal, temperature-measuring module, HART communication module and super
Low ripple power module；Described intermediate-freuqncy signal filtering includes quadravalence high-pass filtering and second-order low-pass filter, wherein, I roads high pass
The cut-off frequency of wave filter is set to 10 times of frequency modulating signal, and the cut-off frequency of Q roads high-pass filter is set to modulated signal frequently
2 times of rate, the gain of high-pass filter uses Capacity control mode, and voltage has uniformly biased 2.5V, and LPF is in order to anti-
Stop signal amplitude is excessive and distortion, and using passive low-pass filter mode, cut-off frequency is set to the 1.5 of intermediate-freuqncy signal highest frequency
Times；AD conversion module is using the converter of 16 SPI interfaces of ADI companies, highest sampling rate 1MHZ；Described DA conversions
Filtering and follower module are used for producing the modulated-analog signal needed for radar antenna, and DA conversions use 16 SPI of ADI companies
The converter of interface, small-sized SO-8 encapsulation is filtered into the passive second order filter of a low pass, and cut-off frequency is 2 times of DA conversion ratios,
To eliminate the influence for the high frequency staircase waveform that DA transfer zones come, follower includes a gain of same phase 0 being made up of operational amplifier
Circuit, the driving force for improving DA outputs；Described temperature-measuring module uses DS18B20, to instrumentation radar antenna
The real time temperature of front end, so as to compensate the non-linear of the antenna VCO due to temperature band；Described HART communication module is mainly used
To produce 4 ~ 20mA electric currents of industrial standard, the acp chip used, for AD421, is a DA conversion chips；Described is ultralow
Ripple power supplies module is mainly used to be supplied to the high-quality 5V power supplys of radar antenna and analog circuit, and the power supply chip used is TI
A chip of the QFN-16 encapsulation of the TPS74 series of company, maximum output current is 1A, and minimum ripple is up to uV grades；
Described digital core core, at least turns including fpga logic array module, DSP digital processor modules and DC-DC power source
Block is changed the mold, described fpga logic array module is ALTERA companies CYCLONE II series EP2C type programmable logic arrays,
Packing forms are FBGA-256, realize the AD collections of modulated signal DA output controls, I, Q and the road signal of modulated signal three and control
System, temperature are read, HART and RS485 Communication Controls and the communication function between DSP digital signal processing modules, wherein DA, AD and
HART controls are realized by three-wire type SPI interface, and RS485 communications are realized using MAX3485 protocol chips and light-coupled isolation；
Described DSP digital processor modules are a floating point DSP the chip serial C6000 of TI companies, while extending out data
Memory storage SDRAM and program storage FLASH, its function are that the AD sampled datas sent to FPGA carry out fast Fourier FFT
Calculate, so as to obtain distance results and result is passed back to FPGA；
Described power supply and external interface board, at least turns DC24V modules and AC220V, DC24V automatic switchover mould including AC220V
Block, 24V turn 5V DC-DC modules and HART interfaces, RS485 interfaces, three external interfaces of power interface, and described AC220V turns
DC24V modules include EMC modules and AC-DC module, and EMC modules are a electromagnetic compatibility module of Jin Shengyang companies, model
FC-LX1D, AC-DC module is that a exchange of Jin Shengyang companies LH25 series turns direct-current switch power supply module, input
220V exchanges are transformed into 24V direct currents, and peak power output reaches 25W；Described AC220V, DC24V automatic switching module is at least wrapped
It is not more than 0.4V diode containing two conducting voltages, for the automatic optionally conduct all the way from AC220V, DC24V two-way voltage
Last 24V outputs；Described 24V turns 5V DC-DC modules and is mainly used in 24V to be converted into 5V, and main devices are TI public
The LM2576 switching power source chips of department, maximum output current is up to 3A；Described HART interfaces, RS485 interfaces are logical to user
Communication interface, power interface provides two kinds of control sources of AC220V and DC24V simultaneously；
Described display and keypad, at least including a LCDs, function key, up key, down key, acknowledgement key four
The single-chip microcomputer of button and a TMS32 series, single-chip microcomputer to display control and receives what is sent by FPGA by serial mode
Result data to be shown, while the configuration parameter information by key-press input is sent to FPGA by serial ports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621361675.XU CN206331109U (en) | 2016-12-13 | 2016-12-13 | A kind of radar range finding circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621361675.XU CN206331109U (en) | 2016-12-13 | 2016-12-13 | A kind of radar range finding circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206331109U true CN206331109U (en) | 2017-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621361675.XU Expired - Fee Related CN206331109U (en) | 2016-12-13 | 2016-12-13 | A kind of radar range finding circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107659272A (en) * | 2017-09-21 | 2018-02-02 | 天津光电通信技术有限公司 | A kind of new up-converter circuit |
| CN107907141A (en) * | 2017-12-29 | 2018-04-13 | 中国铁道科学研究院通信信号研究所 | Suitable for the new locater plate that tests the speed of autonomy-oriented of CTCS2 200C type train control on board equipment |
| CN110399320A (en) * | 2019-07-16 | 2019-11-01 | 武汉鑫诚欣科技有限公司 | A kind of digital signal processing platform meeting mutual high-speed transfer |
| CN110794372A (en) * | 2019-11-12 | 2020-02-14 | 长沙莫之比智能科技有限公司 | Millimeter wave radar and unmanned aerial vehicle multi-target height measurement method based on millimeter wave radar |
| CN117214845A (en) * | 2023-11-08 | 2023-12-12 | 中国科学院空天信息创新研究院 | Radar receiver testing arrangement |
-
2016
- 2016-12-13 CN CN201621361675.XU patent/CN206331109U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107659272A (en) * | 2017-09-21 | 2018-02-02 | 天津光电通信技术有限公司 | A kind of new up-converter circuit |
| CN107907141A (en) * | 2017-12-29 | 2018-04-13 | 中国铁道科学研究院通信信号研究所 | Suitable for the new locater plate that tests the speed of autonomy-oriented of CTCS2 200C type train control on board equipment |
| CN110399320A (en) * | 2019-07-16 | 2019-11-01 | 武汉鑫诚欣科技有限公司 | A kind of digital signal processing platform meeting mutual high-speed transfer |
| CN110794372A (en) * | 2019-11-12 | 2020-02-14 | 长沙莫之比智能科技有限公司 | Millimeter wave radar and unmanned aerial vehicle multi-target height measurement method based on millimeter wave radar |
| CN117214845A (en) * | 2023-11-08 | 2023-12-12 | 中国科学院空天信息创新研究院 | Radar receiver testing arrangement |
| CN117214845B (en) * | 2023-11-08 | 2024-01-26 | 中国科学院空天信息创新研究院 | Radar receiver testing arrangement |
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