CN110286405B - Application of calibration device of deep space detector system - Google Patents
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Abstract
The invention relates to a calibration device applied to a deep space probe system and application thereof, wherein the calibration device comprises: the control device is used for generating control signals to control the working state of each device and generating the control signals of each device, and can perform data interaction with the load controller; the DAC is used for receiving the control signal and the digital code value of the control device and generating a level signal with corresponding amplitude according to the digital code value; the electronic switching circuit is used for converting the level signal into a pulse signal under the control of the control device; the detector sampling and conditioning circuit is used for carrying out data acquisition and processing on signals of the detection system or the electronic switch circuit under the control of the control device; and the ADC is used for performing analog-to-digital conversion on the data acquired by the detector sampling and conditioning circuit, and uploading the data subjected to the analog-to-digital conversion to the load controller through the control device to finish the calibration of the detection system. The invention can be directly carried in the original circuit system and meets the requirements on the volume and the weight of the device in deep space exploration.
Description
Technical Field
The invention relates to a calibration device of a deep space detector system and application thereof, relating to the technical field of space charged particle detection.
Background
The deep space exploration refers to exploration activities of human beings on the moon and distant celestial bodies or space environments, is an important direction of human aerospace activities and an important way of space science and technical innovation, and is one of the development focuses in the current and future aerospace fields.
The detector system for deep space detection comprises various types of detectors and corresponding readout electronics. The system needs to operate on a satellite for a long time, and factors such as environmental temperature, device aging and the like in the operation process can cause parameter change of a circuit, so that a calibration circuit is needed to perform periodic on-orbit calibration on the system so as to detect nonlinear change of an electronic system or a device, and further determine the performance of a detector system.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a calibration apparatus for a deep space probe system, which has a simple structure, is convenient to adjust, and has a high integration level, and an application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a calibration apparatus for a deep space probe system, the calibration apparatus comprising:
the control device is used for generating control signals to control the working state of each device and generating the control signals of each device, and can perform data interaction with the load controller;
the DAC is used for receiving the control signal and the digital code value of the control device and generating a level signal with corresponding amplitude according to the digital code value;
the electronic switching circuit is used for converting the level signal into a pulse signal under the control of the control device;
the detector sampling and conditioning circuit is used for carrying out data acquisition and processing on signals of a detection system or the electronic switch circuit under the control of the control device;
and the ADC is used for carrying out analog-to-digital conversion on the data acquired by the detector sampling and conditioning circuit, and uploading the data after the analog-to-digital conversion to the load controller through the control device to finish the calibration of the detection system.
Preferably, the control device comprises a communication main controller, a trigger generation module, a DAC control module, a self-defense module, an electronic switch control module, a sampling and conditioning circuit control module, an ADC control module and a data packaging transmission module;
the communication main controller module is used for receiving and analyzing instructions sent by the load controller and the self-defense time module, and starting the trigger generation module, the data packing transmission module, the DAC control module and the electronic switch control module;
the trigger generation module is used for generating a trigger signal;
the DAC control module is used for generating a control signal and a digital code value of the DAC and controlling the DAC to output a set stepping level signal during the linear calibration period;
the electronic switch control module is used for generating a control signal of the electronic switch circuit and controlling the electronic switch circuit to be quickly opened and closed during the linear calibration period;
the sampling and conditioning circuit control module is used for generating a control signal of the detector sampling and conditioning circuit, and the detector sampling and conditioning circuit starts a collecting process after receiving the control signal;
the ADC control module is used for generating the ADC control signal and receiving data output by the ADC;
the data packing and transmitting module is used for carrying out online processing and packing and caching on the collected calibration data, and after the communication main controller receives a data transmission instruction of the load controller, the data in a standard format is packed and uploaded to the load controller;
the self-timekeeping module is used for judging whether preset time is reached or not, and if the preset time is reached, sending a signal to the communication main controller to control the electronic system to enter a calibration mode.
Preferably, the communication master controller controls the electronic system to enter the calibration mode in two ways:
manual intervention mode: under the operation of control personnel, configuring calibration parameters and sending an instruction to the communication main controller to enable the electronic system to enter a calibration mode;
automatic calibration mode: the detector system sends a starting instruction at set time intervals through the self-defense time module so that the communication main controller controls the electronic system to automatically enter a calibration mode.
Preferably, the communication master controller controls the electronic system to perform calibration in two stages:
1) baseline calibration mode: the electronic switch circuit is in a disconnected state under the control of the electronic switch control module, and the detector sampling and conditioning circuit acquires the baseline noise output of the detector, sends the baseline noise output to the ADC for analog-to-digital conversion, and uploads the baseline noise output to the load controller through the data packing and transmitting module to serve as data of a baseline calibration part;
2) linear calibration mode: the DAC generates level signals with equal interval stepping under the control of the DAC control module, the electronic switch circuit is opened and closed under the control of the electronic switch control module, the level signals output by the DAC are converted into exponentially attenuated pulse signals, the exponentially attenuated pulse signals are sent to the input end of the detector sampling and conditioning circuit, the output signals of the detector are simulated, and an electronic system is calibrated.
Preferably, the control device adopts an FPGA.
In a second aspect, the present invention further provides an application based on the calibration apparatus, which comprises the following specific processes:
s1: under the normal observation mode, the self-defense time module judges the time code:
s2: determining a calibration parameter;
s3: entering a baseline calibration mode to start calibration;
s4: under the control of the self-triggering signal generated by the trigger generation module, the detector sampling and conditioning circuit collects and processes the signal output by the detection system and sends the collected signal peak value to the ADC for analog-to-digital conversion;
s5: the ADC control module collects signals output by the ADC to obtain calibration data and caches the calibration data;
s6: repeating the steps S3 to S5 until the number of the collected data packets reaches a preset value, ending the baseline calibration mode, and automatically entering the linear calibration mode, wherein during the period, if the load controller issues a data request instruction, the current cache data is transmitted back to the ground through the load controller;
s7: according to the set parameters, a trigger generation module generates a specific number of trigger signals and controls a DAC to continuously output level signals;
s8: the level signal output by the DAC is sent to an electronic switch circuit, the electronic switch circuit is opened or closed under the control of a communication main controller, and the level signal with fixed amplitude output by the DAC is converted into an exponential decay pulse signal with equal amplitude;
s9: the electronic switch circuit sends the generated exponential decay pulse signal as an analog input signal to the detector sampling and conditioning circuit;
s10: the detector sampling and conditioning circuit collects and processes a calibration signal generated by the electronic switch;
s11: under the control of the communication main controller, the detector sampling and conditioning circuit sends the output peak signal to the ADC for digitalization;
s12: the communication main controller collects signals output by the ADC to obtain calibration data, waits for a data request instruction of the load controller after caching, and then transmits the data back to the ground through the load controller;
s13: repeating the steps S7 to S12 until the number of the collected data packets reaches a preset value, and controlling the level value output by the DAC to increase by a step value by the communication main controller;
s14: and step S13 is repeated until the output value of the DAC reaches the end value set in the calibration parameter, and after the acquisition of the level of the end value is finished, the calibration system is automatically switched from the calibration mode to the normal observation mode, and the calibration is finished.
Preferably, the specific process of judging the time code by the self-defense module is as follows:
if the preset time is up, the self-defense module sends a signal to the communication main controller, the communication main controller automatically enters a baseline noise calibration mode, and the calibration parameters select default configuration;
and if the time does not reach the preset time, the control personnel judge whether calibration is needed or not and whether the calibration uses default calibration parameters or not according to the condition, and the calibration of the communication main controller is intervened manually.
Preferably, the specific process for determining the calibration parameter is as follows: and judging whether the calibration parameters use default parameters or not, if not, sending an instruction to the communication main controller through the load controller, and setting the calibration parameters, wherein the calibration parameters comprise a calibration starting point, a calibration end point, a step value and the number of standard data packets collected at each calibration level.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the calibration device has high integration level, can be directly carried in the original circuit system, and meets the requirements on the volume and the weight of the device in deep space exploration;
2. in the deep space exploration, transmission bandwidth resources are extremely limited, and a calibration instruction cannot be sent regularly according to requirements, so that the calibration device has a regular self-starting function, automatically finishes all calibration processes without human intervention after reaching a preset time, and returns data by using the limited bandwidth resources;
3. the signal generated by the calibration device has a flexible and adjustable output range, and can simulate the output characteristics of a complex combined detector system;
in conclusion, the method can be widely applied to the calibration of the deep space detection system.
Drawings
FIG. 1 is a schematic diagram of a control device according to the present invention;
FIG. 2 is a schematic diagram of the output signals of the DAC and electronic switching circuit of the present invention;
FIG. 3 is a block diagram of the calibration process of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1:
the calibration device of the deep space probe system provided by this embodiment includes a control device, a DAC (Digital-to-Analog Converter), an electronic switch circuit, a probe sampling and conditioning circuit, and an ADC (Analog-to-Digital Converter).
The control device can adopt an FPGA (Field-Programmable Gate Array), the periphery of the FPGA is connected with a DAC (digital-to-analog converter), an electronic switch circuit, a detector sampling and conditioning circuit and an ADC (analog-to-digital converter), and control signals of all peripheral devices are respectively generated to control the working state of all devices; in addition, the FPGA can pack and cache the acquired data, and after the data sending request of the load controller arrives, the FPGA sends the data packet to the ground for offline analysis and processing.
And the DAC is used for receiving the control signal and the digital code value sent by the FPGA and generating a level signal with corresponding amplitude according to the digital code value.
The electronic switch circuit is used for converting the level signal into a pulse signal under the control of the FPGA and is used as an input signal of the detector sampling and conditioning circuit in the calibration process.
The detector sampling and conditioning circuit is used for collecting and processing data of the detector system and the electronic switch circuit under the control of the FPGA.
The ADC is used for carrying out analog-to-digital conversion on signals collected by the detector sampling and conditioning circuit, and the converted data are finally uploaded by the FPGA to finish the calibration of the detection system.
Preferably, as shown in fig. 1 and fig. 2, the control device includes a communication main controller, a trigger generation module, a DAC control module, a self-watch time module, an electronic switch control module, a sampling and conditioning circuit control module, an ADC control module, and a data packing transmission module;
the trigger generation module is used for generating trigger signals as mark signals in the calibration process, and one trigger signal starts one acquisition process;
the communication main controller module is used for receiving and analyzing instructions sent by the load controller and the self-defense time module, and starting the trigger generation module and the data packing transmission module.
And the DAC control module is used for generating a control signal and a digital code value of an external DAC and controlling the DAC to output a set stepped level signal during the linear calibration period.
The electronic switch control module is used for generating a control signal of an external electronic switch circuit, controlling the electronic switch circuit to be quickly opened and closed during the linear calibration period, and converting the level signal output by the DAC into a pulse signal.
The sampling and conditioning circuit control module is used for generating a control signal of an external detector sampling and conditioning circuit and starting a collecting process.
The ADC control module is used for generating an external ADC control signal, receiving data output by the ADC and sending the data to the data packing and transmitting module.
And the data packing and transmitting module is used for carrying out online processing and packing and caching on the collected calibration data, and after the communication main controller receives a data transmission instruction of the load controller, the data in the standard format is packed and uploaded to the load controller.
The self-timing module starts timing after being electrified and is used for judging whether the preset time is reached or not, and if the preset time is reached, a signal is sent to the communication main controller to enable the electronic system to enter a calibration mode.
Preferably, the communication master controller controls the electronic system to enter the calibration mode in two ways:
manual intervention mode: under the operation of control personnel, configuring calibration parameters and sending an instruction to the communication main controller to enable the electronic system to enter a calibration mode;
automatic calibration mode: the detector system sends a starting instruction at set time intervals through the self-defense time module so that the communication main controller controls the electronic system to automatically enter a calibration mode.
Preferably, the communication master controller controls the electronics system to perform calibration in two phases:
baseline calibration mode: the electronic switch circuit is in a disconnected state under the control of the electronic switch control module, the detector sampling and conditioning circuit collects the baseline noise output of the detector, and the baseline noise output is sent to the ADC for analog-to-digital conversion and then is uploaded to the load controller through the FPGA to serve as data of a baseline calibration part.
Linear calibration mode: the DAC generates level signals with equal interval stepping under the control of the DAC control module, the electronic switch circuit is rapidly opened and closed under the control of the electronic switch control module, the level signals output by the DAC are converted into exponentially attenuated pulse signals, the exponentially attenuated pulse signals are sent to the input end of the detector sampling and conditioning circuit, the output signals of the detector are simulated, and an electronic system is calibrated.
Preferably, the electronic switch circuit is composed of a high-speed electronic switch and a corresponding peripheral leakage circuit, the electronic switch circuit is controlled by the electronic switch control module to be rapidly switched on and switched off, the input of the electronic switch circuit is a level signal output by the DAC, when the switch is switched on, the output end of the electronic switch circuit is pulled up to the level of the input end by the level signal of the input end, then the switch is switched off, and the leakage circuit of the output end rapidly pulls down the voltage of the output end to generate a pulse waveform to simulate the output signal of the detector.
Example 2:
as shown in fig. 3, based on the above calibration device, the present embodiment describes in detail the specific application of the calibration device:
s1: under the normal observation mode, the self-defense time module judges the time code:
if the preset time (the typical application of the embodiment is 30 days), a signal is sent to the communication main controller, the communication main controller automatically enters a baseline noise calibration mode, and the calibration parameters select default configuration;
and if the time does not reach the preset time, judging whether calibration is needed or not and whether the calibration uses default calibration parameters or not by the control personnel according to the conditions, and intervening in the calibration of the communication main controller manually.
S2: and judging whether default parameters are used (in the implementation, the default parameters are set to be 0V of an initial value, 2V of a final value and 100mv of a stepping value, the time for continuously collecting ten standard format data packets at each calibration level is required, if the default parameters are not used, sending an instruction to the communication main controller through the load controller, and setting a calibration starting point, a calibration end point, a stepping value and the number of the data packets collected at each calibration level.
S3: entering baseline calibration mode to start calibration
According to the set parameters, the trigger generation module generates a trigger signal, a collection cycle is started, the cycle number is equal to the trigger number generated by the trigger generation module, in practical application, the collection cycle is performed for 23 times, and the generated data volume can form a response data packet in a standard format. The baseline calibration is performed for 10 such cycles, so as to obtain ten response data packets in standard format, thereby ensuring that enough data volume is available for subsequent data analysis. During baseline noise calibration, the communication main controller controls an external electronic switch circuit to be in a disconnected state, so that the external electronic switch circuit does not generate an output signal, the baseline noise output of the detector is ensured to be acquired by a detector sampling conditioning circuit, a data acquisition process is started, and a trigger generation module generates a set number of trigger signals to control the detector sampling and conditioning circuit to acquire the baseline noise output of a detection system and process the acquired signals;
s4: under the control of the self-triggering signal generated by the trigger generation module, the detector sampling and conditioning circuit sends the output peak signal to the ADC for analog-to-digital conversion.
S5: and the ADC control module acquires the signal output by the ADC to obtain calibration data and caches the calibration data.
S6: and repeating the steps S3 to S5 until the number of the collected data packets reaches a preset value, ending the baseline calibration mode, and automatically entering the linear calibration mode, wherein during the period, if the load controller issues a data request instruction, the current cache data is transmitted back to the ground through the load controller.
S7: according to the set parameters, the trigger generation module generates a specific number of self-trigger signals and controls the DAC to continuously output a specific level signal.
S8: and the level signal output by the DAC is sent to an electronic switch circuit, the electronic switch circuit is opened or closed under the control of a communication main controller, and the level signal with fixed amplitude output by the DAC is converted into an exponential decay pulse signal with equal amplitude.
S9: the electronic switching circuit sends the generated exponentially decaying pulse signal as an analog input signal to the detector sampling and conditioning circuit.
S10: the detector sampling and conditioning circuit carries out shaping, filtering, charge conversion, peak holding and other processing on signals output by the detection system.
S11: under the control of the communication main controller, the detector sampling and conditioning circuit sends the output peak signal to the ADC for digitalization.
S12: the communication main controller collects signals output by the ADC to obtain calibration data, waits for a data request instruction of the load controller after caching, and then transmits the data back to the ground through the load controller.
In practical application, in a linear calibration stage, each level value output by the DAC is subjected to ten cycles, each cycle is acquired 23 times, and finally, each level value obtains ten data response packets in a standard format for subsequent offline analysis. After the ten cycles are finished, the control device controls the level output by the DAC to increase by a stepping value to the next level value, and the ten cycles of the next amplitude are started. The minimum value output by the DAC is the initial value, the value increased each time is the stepping value, the finally reached value is the final value, and the three values are all set to be adjustable in multiple gears during calibration parameter configuration, so that the calibration flexibility is improved.
S13: and repeating the steps S7 to S12 until the number of the collected data packets reaches a preset value, and controlling the level value output by the DAC to increase by a step value by the communication master controller.
S14: and step S13 is repeated until the output value of the DAC reaches the end value set in the calibration parameter, and after the acquisition of the level of the end value is finished, the calibration device automatically switches from the calibration mode to the normal observation mode, and the calibration is finished.
During the period, if the load controller issues a data request instruction, the current cache data is transmitted back to the ground system through the load controller, and the ground system performs off-line analysis on the acquired data to obtain the current baseline noise level and the linear performance of the detector.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the scope of protection thereof, and although the present application is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: numerous variations, modifications, and equivalents will occur to those skilled in the art upon reading the present application and are within the scope of the claims appended hereto.
Claims (3)
1. The application of the calibration device of the deep space probe system is characterized by comprising the following specific processes:
be provided with calibration device of deep space probe system, this calibration device includes: the control device is used for generating control signals to control the working state of each device and generating the control signals of each device, and can perform data interaction with the load controller; the DAC is used for receiving the control signal and the digital code value of the control device and generating a level signal with corresponding amplitude according to the digital code value; the electronic switching circuit is used for converting the level signal into a pulse signal under the control of the control device; the detector sampling and conditioning circuit is used for carrying out data acquisition and processing on signals of a detection system or the electronic switch circuit under the control of the control device; the ADC is used for carrying out analog-to-digital conversion on the data collected by the detector sampling and conditioning circuit, and uploading the data after the analog-to-digital conversion to the load controller through the control device to finish the calibration of the detection system; the control device comprises a communication main controller, a trigger generation module, a DAC control module, a self-defense time module, an electronic switch control module, a sampling and conditioning circuit control module, an ADC control module and a data packing and transmitting module; the communication main controller module is used for receiving and analyzing instructions sent by the load controller and the self-defense time module, and starting the trigger generation module, the data packing transmission module, the DAC control module and the electronic switch control module; the trigger generation module is used for generating a trigger signal; the DAC control module is used for generating a control signal and a digital code value of the DAC and controlling the DAC to output a set stepping level signal during the linear calibration period; the electronic switch control module is used for generating a control signal of the electronic switch circuit and controlling the electronic switch circuit to be quickly opened and closed during the linear calibration period; the sampling and conditioning circuit control module is used for generating a control signal of the detector sampling and conditioning circuit, and the detector sampling and conditioning circuit starts a collecting process after receiving the control signal; the ADC control module is used for generating the ADC control signal and receiving data output by the ADC; the data packing and transmitting module is used for carrying out online processing and packing and caching on the collected calibration data, and after the communication main controller receives a data transmission instruction of the load controller, the data in a standard format is packed and uploaded to the load controller; the self-timekeeping module is used for judging whether preset time is reached or not, and if the preset time is reached, sending a signal to the communication main controller to control the electronic system to enter a calibration mode; the communication main controller controls the electronic system to carry out calibration and is divided into two stages: 1) baseline calibration mode: the electronic switch circuit is in a disconnected state under the control of the electronic switch control module, and the detector sampling and conditioning circuit acquires the baseline noise output of the detector, sends the baseline noise output to the ADC for analog-to-digital conversion, and uploads the baseline noise output to the load controller through the data packing and transmitting module to serve as data of a baseline calibration part; 2) linear calibration mode: the DAC generates level signals with equal interval stepping under the control of the DAC control module, the electronic switch circuit is opened and closed under the control of the electronic switch control module, the level signals output by the DAC are converted into exponentially attenuated pulse signals, the exponentially attenuated pulse signals are sent to the input end of the detector sampling and conditioning circuit, the output signals of the detector are simulated, and an electronic system is calibrated;
s1: under the normal observation mode, the self-defense time module judges the time code:
s2: determining a calibration parameter;
s3: entering a baseline calibration mode to start calibration;
s4: under the control of the self-triggering signal generated by the trigger generation module, the detector sampling and conditioning circuit collects and processes the signal output by the detection system and sends the collected signal peak value to the ADC for analog-to-digital conversion;
s5: the ADC control module collects signals output by the ADC to obtain calibration data and caches the calibration data;
s6: repeating the steps S3 to S5 until the number of the collected data packets reaches a preset value, ending the baseline calibration mode, and automatically entering the linear calibration mode, wherein during the period, if the load controller issues a data request instruction, the current cache data is transmitted back to the ground through the load controller;
s7: according to the set parameters, a trigger generation module generates a specific number of trigger signals and controls a DAC to continuously output level signals;
s8: the level signal output by the DAC is sent to an electronic switch circuit, the electronic switch circuit is opened or closed under the control of a communication main controller, and the level signal with fixed amplitude output by the DAC is converted into an exponential decay pulse signal with equal amplitude;
s9: the electronic switch circuit sends the generated exponential decay pulse signal as an analog input signal to the detector sampling and conditioning circuit;
s10: the detector sampling and conditioning circuit collects and processes a calibration signal generated by the electronic switch;
s11: under the control of the communication main controller, the detector sampling and conditioning circuit sends the output peak signal to the ADC for digitalization;
s12: the communication main controller collects signals output by the ADC to obtain calibration data, waits for a data request instruction of the load controller after caching, and then transmits the data back to the ground through the load controller;
s13: repeating the steps S7 to S12 until the number of the collected data packets reaches a preset value, and controlling the level value output by the DAC to increase by a step value by the communication main controller;
s14: and step S13 is repeated until the output value of the DAC reaches the end value set in the calibration parameter, and after the acquisition of the level of the end value is finished, the calibration system is automatically switched from the calibration mode to the normal observation mode, and the calibration is finished.
2. The application of claim 1, wherein the specific process of the self-defense module for judging the time code is as follows:
if the preset time is up, the self-defense module sends a signal to the communication main controller, the communication main controller automatically enters a baseline noise calibration mode, and the calibration parameters select default configuration;
and if the time does not reach the preset time, the control personnel judge whether calibration is needed or not and whether the calibration uses default calibration parameters or not according to the condition, and the calibration of the communication main controller is intervened manually.
3. The application of claim 1, wherein the specific process of determining the calibration parameters is as follows: and judging whether the calibration parameters use default parameters or not, if not, sending an instruction to the communication main controller through the load controller, and setting the calibration parameters, wherein the calibration parameters comprise a calibration starting point, a calibration end point, a step value and the number of standard data packets collected at each calibration level.
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