CN104749644A - Portable ground penetrating radar capable of detecting soil water content in field - Google Patents
Portable ground penetrating radar capable of detecting soil water content in field Download PDFInfo
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- CN104749644A CN104749644A CN201510124155.0A CN201510124155A CN104749644A CN 104749644 A CN104749644 A CN 104749644A CN 201510124155 A CN201510124155 A CN 201510124155A CN 104749644 A CN104749644 A CN 104749644A
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Abstract
The invention discloses a portable ground penetrating radar capable of detecting soil water content in a field. The portable ground penetrating radar comprises a transmission/ receiving antenna which is connected with a circulator; a transmitter and a receiver are respectively connected with the circulator; a frequency synthesizing unit is connected with the transmitter, and while a signal processing unit is connected with the receiver; a host computer is connected with the signal processing unit. The portable ground penetrating radar has the beneficial effects that the preset code type can be processed by radar wave transmission, quick sampling of target echo, follow radar algorithm processing, and host computer data processing and displaying; all target signals exceeding threshold after detecting and determining can be uploaded to the host computer; the mathematical model obtained in test can be adopted; the host computer can be used for processing and displaying the water content rate data under different soil depth; in addition, the data are transmitted through WLAN, the networking capacity can be expanded in the future so as to achieve multi-point synchronous testing.
Description
Technical field
The invention belongs to detecting devices technical field, relate to a kind of can the portable ground penetrating radar of Site Detection soil moisture content.
Background technology
At present, method mainly electric-resistivity method, the capacitance method etc. of Site Detection soil moisture content, all change with the change of water percentage according to the resistivity/permittivity of soil, the signal collected by sensor by the mathematical model building sensor two electrode resistances/electric capacity and the holard is transformed into water percentage parameter, and carry out the display of final water percentage index, and realize multiple spot monitor in real time by setting up area wireless network.
But, above-mentioned Site Detection be that multisensor needs to imbed target area in advance in earlier stage, and namely the sensor depth after imbedding can not be changed, and namely can only detect the water percentage of relative constant depth; Owing to being place into the soil, be unfavorable for the Soil tillage in later stage; In addition, more for the sensor needed for larger target area, namely add instrument cost and cost of labor simultaneously, reduce detection efficiency.
Summary of the invention
The object of this invention is to provide a kind of can the portable ground penetrating radar of Site Detection soil moisture content, realize the soil moisture content of efficient detection different depth.
The technical solution adopted in the present invention is, a kind of can the portable ground penetrating radar of Site Detection soil moisture content, comprise transmit/receive antenna, transmit/receive antenna is connected with circulator, transmitter, receiver are connected with circulator respectively, frequency synthesis unit is connected with transmitter, and signal processing unit is connected with receiver, and host computer is connected with signal processing unit.
Feature of the present invention is also, frequency synthesis unit is made up of a FPGA control module, DDS kernel and the DAC modular converter connected successively.
Transmitter is made up of interconnective pulse modulation module, power amplifier module.
Receiver is made up of interconnective low noise amplification module, frequency mixing module.
Signal processing unit is made up of the AD conversion module connected successively, algorithm processing module, data transmission module, algorithm processing module comprises interconnective 2nd FPGA control module, dsp chip, 2nd FPGA control module is connected with AD conversion module, and dsp chip is connected with data transmission module.
The invention has the beneficial effects as follows that the pattern that the present invention can complete presetting carries out emitting radar waves, the high-speed sampling of target echo, follow-up Radar Algorithm process and host computer data processing, display etc.After judging detection, all echo signals exceeding thresholding can upload to host computer.And the mathematical model that binding tests is summed up, water percentage data processing and the display of the different soils degree of depth is carried out by host computer.In addition, owing to adopting WLAN (wireless local area network) to carry out data transmission, networking capability expansion can be carried out in the later stage, realize the synchronism detection of multiple spot.
Accompanying drawing explanation
Fig. 1 is structure diagram of the present invention.
Fig. 2 is structured flowchart of the present invention.
Fig. 3 is frequency synthesis cellular construction figure.
Fig. 4 is the structural drawing of transmitter.
Fig. 5 is the structural drawing of receiver.
Fig. 6 is the structural drawing of signal processing unit.
In figure, 1. soil, 2. transmit/receive antenna, 3. circulator, 4. receiver, 5. transmitter, 6. signal processing unit, 7. frequency synthesis unit, 8. host computer, 9. power amplifier module, 10. pulse modulation module, 11.DAC modular converter, 12.DDS kernel, 13. the one FPGA control modules, 14. low noise amplification modules, 15. frequency mixing module, 16.AD modular converter, 17. algorithm processing module, 18. data transmission modules, 20. the 2nd FPGA control modules, 21.DSP chip.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The invention provides a kind of can the portable ground penetrating radar of Site Detection soil moisture content.Because the water in soil can change conductivity and the specific inductive capacity of soil, namely the water percentage of soil all can be able to produce a very large impact radar velocity of wave propagation and energy loss, therefore, the situation of change of water percentage in GPR (Ground PenetratingRadar) technology detection soil 1 can be applied.Structure as shown in Figure 1 and Figure 2, comprise transmit/receive antenna 2, transmit/receive antenna 2 is connected with circulator 3, transmitter 5, receiver 4 are connected with circulator 3 respectively, frequency synthesis unit 7 is connected with transmitter 5, signal processing unit 6 is connected with receiver 4, and host computer 8 is connected with signal processing unit 6.
Wherein frequency synthesis unit 7 be produced by FPGA needed for transmitting pattern and local oscillation signal needed for post-processed.Frequency synthesis unit 7 produces the sequential/synchronizing signal needed for whole system.
Transmitter 5 is by the pattern of transmitting after filtering, supply emitting antenna after power amplifier.The waveform that transmitter 5 completes required pattern is launched.
Receiver 4 is that echoed signal is supplied signal processing unit 5 after LNA, mixing.Receiver 4 completes the preliminary demodulation process of radar echo signal.
Circulator 3 is for switching emitting antenna and receiving antenna.
Signal processing unit 6 uploads to host computer 8 by WLAN (wireless local area network) after signal is carried out AD conversion, later stage algorithm process.Signal processing unit 6 completes AD signals collecting, Radar Algorithm process.
Host computer 8 is that the data after uploading are carried out screen display, and can carry out parameter configuration etc. to whole system.Complete target data process, display and Systematical control.
In addition, owing to just monitoring soil moisture content, maximum detectable range is only needed to reach the soil crop root degree of depth.
Also comprise necessary power-supply system, debugging interface etc.
Frequency synthesis unit 7 as shown in Figure 3.Form primarily of DDS kernel 12, a FPGA control module 13 and DAC modular converter 11.DDS kernel 12 is responsible for the pattern needed for generation, one FPGA control module 13 is responsible for control DDS kernel 12 and correspondence with foreign country, DAC modular converter 11 is responsible for carrying out digital analogue signal conversion to pattern, and the simulating signal of generation is sent to each subsystem carries out synchronously.
Transmitter 5 as shown in Figure 4.Be made up of pulse modulation module 10, power amplifier module 9.Pulse modulation module 10 waveform be responsible for launching carries out carrier modulation, and power amplifier module 9 carries out power amplification to required waveform, and can control accordingly power amplification multiple.
Receiver 4 as shown in Figure 5.Be made up of low noise amplification module 14, frequency mixing module 15.Low noise amplification module 14 is responsible for target echo signal being carried out signal and is amplified rf filtering, and frequency mixing module 15 is responsible for the signal after by amplification and local oscillation signal carries out mixing, makes it drop to later stage accessible intermediate-freuqncy signal.
Signal processing unit 6 as shown in Figure 6.Be made up of AD conversion module 16, algorithm processing module 17, data transmission module 18.Wherein AD conversion module 16 is responsible for carrying out signals collecting to simulating signal, digital signal after collection carries out Radar Algorithm process by the 2nd FPGA control module 20 in algorithm processing module 17 and dsp chip 21, such as DDC down coversion and pulse compression etc., the data after process upload to host computer 8 by the WLAN (wireless local area network) of data transmission module 18.
Host computer 8 can realize with a general notebook computer.Mainly comprise data processing module, data disaply moudle and system control interface etc.The mathematical model summed up by experiment also runs on host computer.
Whole radar works in directly over ground, the radar signal modulated is transmitted directly to target soil region by emitting antenna by the transmitter of radar, the radar return reflected is transferred to after receiver completes low noise amplification and down coversion by receiving antenna and exports intermediate-freuqncy signal to signal processing unit, and signal processing unit is by uploading to host computer after AD sampling, down coversion algorithm process.The mistiming that host computer returns according to emitting radar waves to reflection wave, reflecting interface apart from the parameter such as the degree of depth of soil surface, in conjunction with before the mathematical model summed up of laboratory realize the mensuration of soil moisture content.
Key problem in technology point of the present invention is:
1. the hardware structure of ground penetrating radar, comprises selection and generation, transmitter, receiver, signal processing unit, the host computer etc. of transmitted waveform.
2. the mathematical model of radar echo signal characteristic and soil moisture content and investigation depth etc.
3. extendible later stage networking capability.
Claims (5)
1. one kind can the portable ground penetrating radar of Site Detection soil moisture content, it is characterized in that, comprise transmit/receive antenna (2), transmit/receive antenna (2) is connected with circulator (3), transmitter (5), receiver (4) are connected with circulator (3) respectively, frequency synthesis unit (7) is connected with transmitter (5), signal processing unit (6) is connected with receiver (4), and host computer (8) is connected with signal processing unit (6).
2. according to claim 1 a kind of can the portable ground penetrating radar of Site Detection soil moisture content, it is characterized in that, frequency synthesis unit (7) is made up of a FPGA control module (13), DDS kernel (12) and the DAC modular converter (11) connected successively.
3. according to claim 1 a kind of can the portable ground penetrating radar of Site Detection soil moisture content, it is characterized in that, transmitter (5) is made up of interconnective pulse modulation module (10), power amplifier module (9).
4. according to claim 1 a kind of can the portable ground penetrating radar of Site Detection soil moisture content, it is characterized in that, receiver (4) is made up of interconnective low noise amplification module (14), frequency mixing module (15).
5. according to claim 1 a kind of can the portable ground penetrating radar of Site Detection soil moisture content, it is characterized in that, signal processing unit (6) is made up of the AD conversion module connected successively (16), algorithm processing module (17), data transmission module (18), described algorithm processing module (17) comprises interconnective 2nd FPGA control module (20), dsp chip (21), 2nd FPGA control module (20) is connected with AD conversion module (16), and dsp chip (21) is connected with data transmission module (18).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510124155.0A CN104749644A (en) | 2015-03-20 | 2015-03-20 | Portable ground penetrating radar capable of detecting soil water content in field |
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| CN201510124155.0A CN104749644A (en) | 2015-03-20 | 2015-03-20 | Portable ground penetrating radar capable of detecting soil water content in field |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106371074A (en) * | 2016-12-04 | 2017-02-01 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Serial time sequence control device and method for multichannel array ground penetrating radar |
| CN106970093A (en) * | 2017-05-19 | 2017-07-21 | 四川莱源科技有限公司 | A kind of radar type MOISTURE MEASUREMENT SYSTEM |
| CN107014835A (en) * | 2017-05-05 | 2017-08-04 | 曲阜师范大学 | Beach salty soil top layer moisture determination method based on GPR back wave |
| CN107765317A (en) * | 2017-11-29 | 2018-03-06 | 国家电网公司 | It is a kind of removably to descend medium detecting device |
| CN107831548A (en) * | 2017-11-29 | 2018-03-23 | 国家电网公司 | A kind of dynamic GPR device of UAV system |
| CN110988866A (en) * | 2019-11-22 | 2020-04-10 | 上海熹翼科技有限公司 | Multi-parameter debris flow early warning device based on radar |
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2015
- 2015-03-20 CN CN201510124155.0A patent/CN104749644A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106371074A (en) * | 2016-12-04 | 2017-02-01 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Serial time sequence control device and method for multichannel array ground penetrating radar |
| CN106371074B (en) * | 2016-12-04 | 2019-06-14 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | A kind of series connection multichannel array Ground Penetrating Radar time sequence control device and method |
| CN107014835A (en) * | 2017-05-05 | 2017-08-04 | 曲阜师范大学 | Beach salty soil top layer moisture determination method based on GPR back wave |
| CN106970093A (en) * | 2017-05-19 | 2017-07-21 | 四川莱源科技有限公司 | A kind of radar type MOISTURE MEASUREMENT SYSTEM |
| CN107765317A (en) * | 2017-11-29 | 2018-03-06 | 国家电网公司 | It is a kind of removably to descend medium detecting device |
| CN107831548A (en) * | 2017-11-29 | 2018-03-23 | 国家电网公司 | A kind of dynamic GPR device of UAV system |
| CN110988866A (en) * | 2019-11-22 | 2020-04-10 | 上海熹翼科技有限公司 | Multi-parameter debris flow early warning device based on radar |
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