Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an intelligent searching and positioning system for a radioactive source and a working method thereof.
The object of the invention is achieved by the following technical measures.
An intelligent searching and positioning system for a radioactive source comprises a power supply system, a positioning system, a nuclear radiation monitoring system, an intelligent computing system and a communication system.
The power supply system is used for supplying power to the positioning system, the nuclear radiation monitoring system, the intelligent computing system and the communication system and adopts direct current power supply. The power system may also be replaced by an external power source, such as the aircraft's power system.
The positioning system is used for positioning the position in real time and transmitting the position information to the intelligent computing system in real time. The positioning system may also be replaced by an external positioning system, such as the positioning system of the aircraft, etc.
The communication system is used for communication transmission of positioning position data, nuclear radiation monitoring data, source searching positioning calculation results and other data. The communication system may also be replaced by an external communication system, such as the communication system of the aircraft, etc.
The nuclear radiation monitoring system executes nuclear radiation real-time monitoring and communicates with the intelligent computing system in real time, on one hand, monitoring results are transmitted to the intelligent computing system, and on the other hand, instruction information of the intelligent computing system is received. The nuclear radiation detection module is used for detecting gamma rays of a ground radioactive source, the nuclear radiation monitoring system comprises a nuclear radiation detection module and a signal processing module, the nuclear radiation detection module transmits nuclear radiation detection signals to the signal processing module, the signal processing module collects, analyzes and processes the detection signals to obtain nuclear radiation monitoring data, namely gamma dose rate data, the nuclear radiation monitoring data are transmitted to the intelligent computing system, the intelligent computing system receives data of the positioning system and the nuclear radiation monitoring system, carries out real-time radioactive source searching and positioning intelligent calculation and supports communication with an external system, and the calculation results, the position data and the nuclear radiation monitoring data are transmitted to other monitoring systems of a ground station through the communication system in real time, so that data support is provided for an aircraft operator to control the flight of the aircraft.
In the above technical solution, the nuclear radiation detection module employs an ionization chamber detector, a GM counting tube detector, a scintillator detector, a semiconductor detector, and the like, and the specific parameters such as the size of the detector are determined by the following factors: 1) searching the maximum flight height of the aircraft when the radioactive source is positioned, namely the maximum searching height; 2) the type of the source item of the radioactive source to be searched and the intensity of the radioactive source. The nuclear radiation detection module requires that the minimum intensity radioactive source to be searched can be effectively detected at the maximum searching height, namely, an effective detection signal is output.
In the above technical solution, the intelligent computing system may be deployed at an aircraft end, or may be deployed at a ground station. When the intelligent computing system is deployed at an aircraft end, the intelligent computing system is communicated with the nuclear radiation monitoring system and the positioning system in the modes of CAN, serial ports and the like on one hand, and transmits data to the ground station in real time through the communication system on the other hand. When the system is deployed to a ground station end, the intelligent computing system receives positioning data and nuclear radiation monitoring data through the communication system, and meanwhile, the computing result is transmitted to other systems of the ground station.
The invention also provides a working method of the intelligent searching and positioning system for the radioactive source, which comprises the following steps:
(1) before searching a radioactive source, presetting and calculating a reference radiation field for each radioactive source item aiming at potential radioactive source items to be searched, thereby obtaining the reference radiation fields of all potential radioactive source items; a reference radiation field is an aerial horizontal radiation field at a certain height from the ground when a certain radiation source item on the ground is at a certain source intensity, wherein the height is the flight height of an aircraft when a radiation source is searched, and the source intensity is the maximum possible source intensity of the searched potential radiation source;
(2) in the process of searching the radioactive source, acquiring flight monitoring data in real time, wherein the flight monitoring data comprises flight position data and nuclear radiation monitoring data on the position, and forming a flight monitoring data point set;
(3) carrying out intelligent calculation by using flight monitoring data and a preset reference radiation field so as to judge whether a radioactive source exists on the ground and position the radioactive source; the intelligent calculation is as follows: and performing calculation analysis by using the flight monitoring data and each preset reference radiation field, wherein if a subset exists in the reference radiation field, the following relation is satisfied: A) the flight monitoring data point set and the nuclear radiation monitoring data of the corresponding point of the neutron set in the reference radiation field are in a linear relation; B) the position coordinates of the corresponding points of the flight monitoring data point set and the neutron set in the reference radiation field are in a linear translation relation; when the two relations are satisfied simultaneously, the radioactive source can be positioned.
The intelligent searching and positioning system for the radioactive source is suitable for being carried on aircrafts such as a man-machine, an unmanned aerial vehicle and the like, and can be used for efficiently searching and accurately positioning the ground radioactive source.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides an efficient and accurate searching and positioning system for a smart radiation source. The system can be carried on aircrafts such as a man-machine and an unmanned aerial vehicle, and can realize quick search and accurate positioning of radioactive sources in the ground environment by executing aerial flight monitoring. The system comprises a power supply system, a positioning system, a nuclear radiation monitoring system, an intelligent computing system and a communication system.
The power supply system is used for supplying power to the positioning system, the nuclear radiation monitoring system, the intelligent computing system and the communication system and adopts direct current power supply. The power system may also be replaced by an external power source, such as the aircraft's power system.
The positioning system is used for positioning the position in real time and transmitting the position information to the intelligent computing system in real time. The positioning system may also be replaced by an external positioning system, such as the positioning system of the aircraft, etc.
The communication system is used for communication transmission of positioning position data, nuclear radiation monitoring data, source searching positioning calculation results and other data. The communication system may also be replaced by an external communication system, such as the communication system of the aircraft, etc.
The nuclear radiation monitoring system is used for performing nuclear radiation real-time monitoring and performing real-time communication with the intelligent computing system, on one hand, the monitoring result is transmitted to the intelligent computing system, and on the other hand, the instruction information of the intelligent computing system is received. The nuclear radiation monitoring system comprises a nuclear radiation detection module and a signal processing module. The nuclear radiation detection module is used for detecting gamma rays of a ground radioactive source, and can adopt an ionization chamber detector, a GM counting tube detector, a scintillator detector, a semiconductor detector and the like, and the specific parameters of the detector, such as the size and the like, are determined according to the following factors: 1) searching the maximum flight height of the aircraft when the radioactive source is positioned, namely the maximum searching height; 2) the type of the source item of the radioactive source to be searched and the intensity of the radioactive source. The nuclear radiation detection module is required to be capable of effectively detecting the minimum-intensity radioactive source required to be searched at the maximum searching height, namely outputting an effective detection signal. The nuclear radiation detection module transmits nuclear radiation detection information to the signal processing module through an analog signal, and the signal processing module acquires, analyzes and processes the detection signal to obtain nuclear radiation monitoring data, namely gamma dose rate data. And finally, the signal processing module transmits the nuclear radiation monitoring data to the intelligent computing system.
The intelligent computing system is used for receiving data of the positioning system and the nuclear radiation monitoring system, performing real-time intelligent computation of searching and positioning of the radioactive source, transmitting a computation result, the position data and the nuclear radiation monitoring data to other monitoring systems of the ground station in real time through the communication system, and providing data support for an aircraft operator to control the flight of the aircraft.
As shown in fig. 3, an embodiment of the present invention further provides a working method of the above-mentioned intelligent searching and positioning system for a radiation source, which includes the following steps:
(1) before starting to search the radioactive source, the source item S ═ S for the potential radioactive source to be searched1,S2,…,SnS, source item S of each radioactive source in intelligent computing systemiPresetting a reference radiation field C for E SiAll reference radiation fields that result in the source item S of the potential radiation source are C ═ C1,C2,…,Cn}. A reference radiation field CiIs directed to a certain radiation source item S on the groundiAssuming its source strength is QiWhich radiates the field horizontally in the air at a certain height h from the ground. A reference radiation field CiCan be represented as Ci={[L1,D1],[L2,D2],…,[Lm,Dm]In which L ismRepresenting position coordinates, DmRepresenting nuclear radiation data (e.g., gamma dose rate, etc.) at the location. In a reference radiation field CiThe coordinates of the center position are the radioactive source SiPosition coordinates of (2), noted as Lri. In the practical application process, the height h is the flight height of the aircraft when the radioactive source is searched, and the source intensity QiPosition coordinates L of the source for the maximum possible source intensity of the potential radioactive source to be searchedriThe area to be searched for the radiation source can be selected at will.
(2) In the process of searching the radioactive source, the intelligent computing system receives flight position data L in real timeiAnd nuclear radiation monitoring data D at the positioni. After a period of flight monitoring, a series of positions are formed and located at these positionsNuclear radiation monitoring data P { [ L ]1,D1],[L2,D2],…,[Lx,Dx]}。
(3) And intelligently calculating by using the flight monitoring data P and a preset reference radiation field C, thereby judging whether a radioactive source exists on the ground or not and positioning the position of the radioactive source. The intelligent calculation is as follows: using flight monitoring data P and each preset reference radiation field CiPerforming a calculation analysis if CiIn the presence of x points Cii={[Lj,Dj],[Lk,Dk],…,[Ly,Dy]}∈Ci={[L1,D1],[L2,D2],…,[Lm,Dm]Are such that C isiiSatisfies the following relationship with P: A) ciiIs in linear relation with nuclear radiation monitoring data of corresponding points in P, namely { Dj,Dk,…,Dy}–f1*{D1,D2,…,Dx}≤{δ11,δ12,…,δ1xIn which f1Being a linear function, { δ11,δ12,…,δ1xIs a set of thresholds for controlling CiiAnd (3) error linearly related to the nuclear radiation monitoring data in P. B) CiiThe middle position coordinate and the P middle position coordinate are in linear translation relation, namely { Lj,Lk,…,Ly}–f2*{L1,L2,…,Lx}≤{δ21,δ22,…,δ2xIn which f2Being a linear function, { δ21,δ22,…,δ2xIs a set of thresholds for controlling CiiError in linear relation to the position coordinates in P. When C is presentiiAnd when the relation A) and the relation B) are simultaneously satisfied with the P, the radioactive source can be positioned, and the positioning method comprises the following steps: radiation source position coordinate Lr ═ f2*Lri。
In this embodiment, the intelligent computing system may be deployed on the aircraft side, as shown in FIG. 1, or on the ground station, as shown in FIG. 2. When the intelligent computing system is deployed at an aircraft end, the intelligent computing system is communicated with the nuclear radiation monitoring system and the positioning system in the modes of CAN, serial ports and the like on one hand, and transmits data to the ground station in real time through the communication system on the other hand. When the system is deployed to a ground station end, the intelligent computing system receives positioning data and nuclear radiation monitoring data through the communication system, and transmits a computing result to other systems of the ground station.
Details not described in the present specification belong to the prior art known to those skilled in the art.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, such that any modification, equivalent replacement or improvement made within the spirit and principle of the present invention shall be included within the scope of the present invention.