CN107576988B - Automatic switching method and device for sampling rate of satellite-borne magnetometer - Google Patents
Automatic switching method and device for sampling rate of satellite-borne magnetometer Download PDFInfo
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Abstract
The invention discloses a method for automatically switching sampling rate of a satellite-borne magnetometer, which comprises the following steps: step S1, setting a magnetic field threshold L and a duration T with the parameter setting unit; step S2, the device receives the magnetic field measured value B collected by the magnetometer, and judges whether the magnetic field measured value B is larger than the magnetic field threshold value L by using the judging unit, if yes, the step S3 is executed, and if not, the step S2 is continuously executed; step S3, switching the sampling rate of the magnetometer to a first sampling rate by the sampling rate switching unit, and executing step S4 when the timing unit counts time and reaches the duration T; step S4, the sampling rate switching unit switches the magnetometer to a second sampling rate; step S2 to step S4 are repeated. The invention can automatically switch the satellite-borne magnetometer to a sampling state with a high sampling rate according to the magnetic field observation value under the condition of reducing misjudgment, thereby realizing timely high-resolution observation under the condition of ensuring the limitation of daily data collection quantity.
Description
Technical Field
The invention relates to a satellite-borne magnetometer output data sampling system, in particular to a satellite-borne magnetometer sampling rate automatic switching method and device.
Background
The satellite-borne magnetometer generally has limitation on the collected data volume, and if the data volume collected every day is too large, the data volume cannot be transmitted to the ground, especially for deep space exploration. In order to reduce the amount of data collected, a satellite-borne magnetometer collects magnetic field data at a low sampling rate under normal conditions, but when a special magnetic field anomaly is encountered, a scientific user wants to observe more details through the data, for example, when strong solar wind is encountered or a magnetic field anomaly in a certain area on a planet is encountered, in order to observe more details under the special magnetic anomaly condition, data at a higher sampling rate is needed, the satellite-borne magnetometer is usually remotely controlled by injecting an instruction into the ground to be observed at a high sampling rate, but since the instruction transmission needs a long time, particularly for deep space exploration, a certain instruction reaches an instrument for several hours, high-resolution observation time of some magnetic field anomalies is likely to be missed, and the ground cannot observe the needed details.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and an apparatus for automatically switching the sampling rate of a satellite-borne magnetometer, which can automatically switch a satellite-borne magnetometer to a sampling state with a high sampling rate according to a magnetic field observation value, thereby realizing high-resolution observation in time, while reducing misjudgment.
In order to solve the technical problems, the invention adopts the following technical scheme.
A satellite-borne magnetometer sampling rate automatic switching method is realized based on a device, the device comprises a parameter setting unit, a judging unit, a sampling rate switching unit and a timing unit, the device is preset with a first sampling rate and a second sampling rate, the first sampling rate is larger than the second sampling rate, and the method comprises the following steps: step S1, setting a magnetic field threshold L and a duration T with the parameter setting unit; step S2, the device receives the magnetic field measured value B collected by the magnetometer, and judges whether the magnetic field measured value B is larger than the magnetic field threshold value L by using the judging unit, if yes, the step S3 is executed, and if not, the step S2 is continuously executed; step S3, switching the sampling rate of the magnetometer to a first sampling rate by the sampling rate switching unit, and executing step S4 when the timing unit counts time and reaches the duration T; step S4, the sampling rate switching unit switches the magnetometer to a second sampling rate; step S2 to step S4 are repeated.
Preferably, the apparatus further includes a counter, and in step S3, when the sampling rate of the magnetometer is switched to the first sampling rate, the counter is incremented by 1.
Preferably, the counter is preset with an upper limit value M, and the determining unit stops determining the magnetic field measurement value B and the magnetic field threshold value L when the count of the counter reaches the upper limit value M.
Preferably, the determination unit is preset with a continuous comparison time T2, and in step S2, when the determination unit determines that the magnetic field measurement value B is greater than the magnetic field threshold value L within the continuous comparison time T2, step S3 is executed.
Preferably, the setting process of the continuous comparison time T2 includes: under the ground simulation environment, the maximum value T0 of the duration time of the instantaneous background interference magnetic field in the working environment of the satellite-borne magnetometer is measured, and the continuous comparison time T2 is set to be T2> T0.
Preferably, in step S3, when the sampling rate switching unit switches the sampling rate of the magnetometer to the first sampling rate, the judging unit stops the judgment of the magnetic field measurement value B and the magnetic field threshold value L until the timing of the timing unit reaches the duration T.
Preferably, the setting process of the magnetic field threshold value L includes: under the ground simulation environment, the range of a background interference magnetic field of the satellite-borne magnetometer is measured, the maximum value of the total field of the background interference magnetic field is determined to be B0, and then the magnetic field threshold value L is set to be L-B0 + B1 by combining the determined maximum value B1 of the total field of the target detection planet.
A satellite-borne magnetometer sampling rate automatic switching device comprises a parameter setting unit, a judging unit, a sampling rate switching unit and a timing unit, wherein a first sampling rate and a second sampling rate are preset in the device, the first sampling rate is greater than the second sampling rate, the device is used for receiving a magnetic field measured value B acquired by a magnetometer, and the parameter setting unit is used for setting a magnetic field threshold value L and a duration time T; the judging unit is used for judging whether the magnetic field measured value B is larger than a magnetic field threshold value L: if yes, the sampling rate of the magnetometer is switched to a first sampling rate by the sampling rate switching unit, and when the timing unit counts time and reaches the duration T, the sampling rate of the magnetometer is switched to a second sampling rate; if not, the sampling rate switching unit keeps the sampling rate of the magnetometer at the second sampling rate.
Preferably, the sampling rate switching unit includes a 2-to-1 data selector, and the 2-to-1 data selector is used to switch between the first sampling rate and the second sampling rate.
Preferably, the parameter setting unit comprises registers for the writing magnetic field threshold L and the duration T.
In the method for automatically switching the sampling rate of the satellite-borne magnetometer, disclosed by the invention, under the normal condition that a magnetic field measurement value B is lower than a magnetic field threshold value L, magnetic field data can be acquired by using a low sampling rate, when a magnetic field abnormal condition occurs, the magnetometer can be automatically switched to a high sampling rate under the action of a judging unit and a sampling rate switching unit, and is continuously acquired for a period of time, and when the duration of the high sampling rate reaches a duration T, the magnetometer is automatically switched to the low sampling rate.
Drawings
Fig. 1 is a flowchart of an automatic switching method of the sampling rate of the satellite-borne magnetometer.
Fig. 2 is a block diagram of the automatic switching device for the sampling rate of the satellite-borne magnetometer.
Fig. 3 is a flow chart of the process performed by the parameter setting unit in the preferred embodiment of the present invention.
Fig. 4 is a flow chart of the process performed by the determining unit in the preferred embodiment of the present invention.
Fig. 5 is a schematic port diagram of a sampling rate switching unit according to a preferred embodiment of the present invention.
Detailed Description
The invention is described in more detail below with reference to the figures and examples.
The invention discloses a method for automatically switching sampling rates of a satellite-borne magnetometer, which is realized based on a device as shown in a figure 1 and a figure 2, wherein the device comprises a parameter setting unit 201, a judging unit 202, a sampling rate switching unit 203 and a timing unit 204, the device is preset with a first sampling rate and a second sampling rate, and the first sampling rate is greater than the second sampling rate, and the method comprises the following steps:
step S1, setting the magnetic field threshold value L and the duration T with the parameter setting unit 201;
step S2, the apparatus receives the magnetic field measurement value B collected by the magnetometer, and determines whether the magnetic field measurement value B is greater than the magnetic field threshold value L by using the determination unit 202, if so, step S3 is executed, and if not, step S2 is continuously executed;
step S3, switching the sampling rate of the magnetometer to the first sampling rate by the sampling rate switching unit 203, and executing step S4 when the timer 204 counts time and reaches the duration T;
step S4, the sampling rate switching unit 203 switches the magnetometer to the second sampling rate;
step S2 to step S4 are repeated.
In the method for automatically switching the sampling rate of the satellite-borne magnetometer, under the normal condition that a magnetic field measurement value B is lower than a magnetic field threshold value L, magnetic field data can be collected by using a low sampling rate, when a magnetic field abnormal condition occurs, the magnetometer can be automatically switched to a high sampling rate (namely a first sampling rate) under the action of the judging unit 202 and the sampling rate switching unit 203, the sampling rate is continuously collected for a period of time, and when the duration of the high sampling rate reaches a duration time T, the magnetometer is automatically switched to the low sampling rate (namely a second sampling rate).
In step S1, as shown in fig. 2 and 3, the magnetic field threshold L required for high sampling rate switching should be set first. One method for setting the default value of the magnetic field threshold value L is as follows: under the ground simulation environment, the range of the background interference magnetic field of the satellite-borne magnetometer is measured, the maximum value of the total field of the interference magnetic field (not including the instantaneous interference magnetic field similar to that of other equipment during the startup and shutdown) is determined to be B0, the maximum value of the total field of the magnetic field on the planet (on the surface or in the air) to be detected is determined through previous information, and the threshold value L is B0+ B1. After the specific detection data is obtained on the ground, the threshold L may be modified again according to the specific situation by the parameter setting unit 201 of the ground injection instruction and the automatic sampling rate switching device.
It can be seen that the setting process of the magnetic field threshold L includes: under the ground simulation environment, the range of a background interference magnetic field of the satellite-borne magnetometer is measured, the maximum value of the total field of the background interference magnetic field (excluding short-time interference magnetic fields caused by the switching on and off of other equipment and the like) is determined to be B0, and then the magnetic field threshold value L is set to be B0+ B1 by combining the determined maximum value B1 of the total field of the target detection planet.
Second, a high sample rate holding time T (i.e., duration T) and a maximum value M of the number of times of high sample rate per day (i.e., upper limit value M) are set. One way of setting the default values of the high sample rate holding time T and the maximum value M of the number of high sample rate times per day is: according to the limit calculation of the data amount working per day, if the high sampling rate is maintained for 1 hour at most by calculating, the high sampling rate holding time T may be set to 15 minutes and the number of times of the high sampling rate is set to 4 times. If the abnormal condition of the magnetic field exceeds 15 minutes, after the low sampling rate is returned, because the high sampling rate times do not exceed M on the day, the sampling can be continued by switching to the high sampling rate again. And at the moment, the automatic sampling rate switching system does not judge any more and does not switch to the high sampling rate again until the number of times of the high sampling rate exceeds M times. After the specific detection data is obtained on the ground, the high sampling rate holding time T and the maximum value M of the number of times of high sampling rate per day can be modified again according to the specific data by the ground injection instruction and the parameter setting unit 201 of the automatic sampling rate switching device.
The above implementation can be summarized as follows: the apparatus further includes a counter, and in step S3, the counter is incremented by 1 when the sampling rate of the magnetometer is switched to the first sampling rate. Further, the counter is preset with an upper limit value M, and when the count of the counter reaches the upper limit value M, the determining unit 202 stops determining the magnetic field measurement value B and the magnetic field threshold value L.
In addition, setting a continuous comparison time T2 is also included. One method of setting the default value of the time T2 for the continuous comparison is: under the ground simulation environment, the maximum value T0 of the duration time of the short-time background interference magnetic field (such as the on-off of other equipment and the like) of the satellite-borne magnetometer is measured, and the T2 is set to meet the conditions that T2> T0. After the specific detection data is obtained on the ground, the continuous comparison time T2 may be modified again according to the specific data through the ground injection instruction and the parameter setting unit 201 of the automatic switching sampling rate device.
That is, the determination unit 202 is preset with a continuous comparison time T2, and in the step S2, when the determination unit 202 determines that the magnetic field measurement value B is greater than the magnetic field threshold value L within the continuous comparison time T2, the step S3 is executed. Further, the setting process of the continuous comparison time T2 includes: under the ground simulation environment, the maximum value T0 of the duration time of the transient background interference magnetic field (such as the interference magnetic field caused by the startup and shutdown of other equipment) in the working environment of the satellite-borne magnetometer is measured, and the continuous comparison time T2 is set to T2> T0.
In step S2, as shown in fig. 2 and 4, it is determined whether switching to the high sampling rate is required according to the detected magnetic field value and the threshold value. The method specifically comprises the following steps: because the threshold is the size of the total magnetic field, the magnetic field data acquired by the satellite-borne magnetometer is generally a three-component vector, the size of the total field needs to be solved through X, Y, Z three-component magnetic field, and then the total field is compared with the threshold L, if the acquired values of the continuous T2 time content are all larger than the threshold L, the satellite-borne magnetometer is switched to a high sampling rate by using the switching sampling rate unit 203. Otherwise, the existing sampling rate is kept, the timer is reset to zero (or the counter is reset to zero), and whether the newly acquired data meets the condition of switching to the high sampling rate or not is judged again.
In step S3, as shown in fig. 2 and 5, after switching to the high sampling rate, the sampling rate should be kept for a certain time T. The method specifically comprises the following steps: the sampling rate switching is realized by the sampling rate switching unit 203, the sampling rate switching unit 203 can be realized by a data selector of 1 from 2, and when the switching to the high sampling rate is needed, the control signal is set to be at a high level (or a low level) to gate a channel for outputting at the high sampling rate. The method comprises the steps that after the sampling rate is switched to be high, the sampling rate needs to be increased for a certain time T, specifically, the sampling rate can be achieved in a counter mode, when the sampling rate is switched to be high, the counter is started, the counter counts according to a certain frequency, when the counting size corresponding to the time T is counted, the high sampling rate is kept for the time T, and at the moment, the sampling rate returns to be in a low sampling rate state to conduct collection.
Further, in step S3, when the sampling rate switching unit 203 switches the sampling rate of the magnetometer to the first sampling rate, the determination unit 202 stops the determination of the magnetic field measurement value B and the magnetic field threshold value L until the count of the timing unit 204 reaches the duration T.
In order to better explain the technical solution of the present invention, the present invention further discloses an automatic sampling rate switching device for a satellite-borne magnetometer, which is shown in fig. 1 and fig. 2, and includes a parameter setting unit 201, a determining unit 202, a sampling rate switching unit 203, and a timing unit 204, wherein the device is preset with a first sampling rate and a second sampling rate, the first sampling rate is greater than the second sampling rate, and the device is configured to receive a magnetic field measurement value B acquired by the magnetometer, wherein,
the parameter setting unit 201 is used for setting a magnetic field threshold value L and a duration time T;
the determining unit 202 is configured to determine whether the magnetic field measurement value B is greater than the magnetic field threshold value L:
if yes, the sampling rate of the magnetometer is switched to a first sampling rate by using the sampling rate switching unit 203, and when the timing unit 204 counts time and reaches the duration time T, the sampling rate of the magnetometer is switched to a second sampling rate;
if not, continuously judging whether the magnetic field measurement value B is larger than the magnetic field threshold value L.
Preferably, the sampling rate switching unit 203 includes a 2-to-1 data selector, and the 2-to-1 data selector is used to switch between the first sampling rate and the second sampling rate. The parameter setting unit 201 comprises registers for the writing magnetic field threshold L and the duration T.
In the above device, returning to the low sampling rate is still realized by the sampling rate switching unit 203, the sampling rate switching unit 203 is realized by a 2-to-1 data selector, and when switching to the high sampling rate is required, the control signal is set to be at a low level (or a high level) to gate a channel for outputting at the low sampling rate. Furthermore, the increment of the number of executions of the high sampling rate can be realized by an accumulator.
In this embodiment, the parameter setting unit 201 is configured to set parameters related to an automatic switching function, and the main functions are to receive a data instruction, analyze a command code and parameters in the instruction, and set a corresponding register according to the parameters. Referring to fig. 3, the setting unit first analyzes the uploaded command, determines which parameter is to be modified, then determines the validity of the parameter, modifies the corresponding parameter if the parameter is valid, and otherwise enters an error handling process and responds.
The determining unit 202 is configured to determine whether a condition for switching to a high sampling rate is satisfied, and referring to fig. 4, the determining unit receives the magnetic field detection value, and then first determines whether to start determining, where the condition for not starting determining is:
A. at this point the device has entered the high sample rate mode and is within the timed time T.
B. At the moment, the number of times that the device enters the high sampling rate exceeds M times, and the high sampling rate is not started any more for downloading the acquired data.
And if the judgment is not started, the subsequent judgment process is not started, otherwise, the judgment is started, and the judgment process is started. Firstly, calculating a total magnetic field value, then comparing a total magnetic field B with a threshold value L, if B is less than L, directly resetting the counter and continuously receiving magnetic field detection data, otherwise, if B is greater than L, adding 1 to the counter, then judging whether the counter reaches a count value corresponding to T2, if the count value of the counter is greater than the count value corresponding to T2, controlling a switching sampling rate unit, switching the satellite-borne magnetometer to a high sampling rate, simultaneously setting a mark to indicate that a high sampling rate mode is entered, and not starting judgment after receiving the magnetic field data again. Otherwise, continuing to receive the data, starting judgment and entering a subsequent judgment process.
The sampling rate switching unit 203 is used for realizing switching of high and low sampling rates. It can adopt a 2-to-1 data selector, please refer to fig. 5, the control signal is an output signal for judging whether the unit is switched to the high sampling rate, the gated channel with the low sampling rate is the normal condition (the control signal is low level), when the control signal is judged to need to switch to the high sampling rate, the control signal gates the channel with the high sampling rate (the control signal is high level).
The timing unit 204 is configured to time the high-sampling-rate holding time, and may be implemented by using any timer or by counting according to a certain frequency.
The invention discloses a method and a device for automatically switching the sampling rate of a satellite-borne magnetometer, which can automatically switch the satellite-borne magnetometer to a sampling state with a high sampling rate according to a magnetic field observation value under the condition of reducing misjudgment, thereby realizing timely high-resolution observation under the condition of ensuring the limitation of daily acquired data quantity.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the technical scope of the present invention should be included in the scope of the present invention.
Claims (6)
1. A method for automatically switching sampling rates of a satellite-borne magnetometer is characterized by being realized based on a device, wherein the device comprises a parameter setting unit (201), a judging unit (202), a sampling rate switching unit (203) and a timing unit (204), a first sampling rate and a second sampling rate are preset in the device, and the first sampling rate is greater than the second sampling rate, and the method comprises the following steps:
a step S1 of setting a magnetic field threshold value L and a duration T by a parameter setting unit (201);
step S2, the device receives the magnetic field measured value B collected by the magnetometer, and judges whether the magnetic field measured value B is larger than the magnetic field threshold value L by using the judging unit (202), if so, the step S3 is executed, and if not, the step S2 is continuously executed;
step S3, switching the sampling rate of the magnetometer to a first sampling rate by the sampling rate switching unit (203), and executing step S4 when the timing unit (204) counts to reach the duration T;
step S4, the sampling rate switching unit (203) switching the magnetometer to a second sampling rate;
repeating the steps S2 to S4;
the continuous comparison time T2 is preset in the judgment unit (202), and in the step S2, when the judgment unit (202) judges that the magnetic field measurement value B is greater than the magnetic field threshold value L within the continuous comparison time T2, the step S3 is executed;
the setting process of the continuous comparison time T2 comprises the following steps: under the ground simulation environment, measuring the maximum value T0 of the duration time of the instantaneous background interference magnetic field in the working environment of the satellite-borne magnetometer, and setting the continuous comparison time T2 as T2> T0;
the apparatus further includes a counter, and in step S3, when the sampling rate of the magnetometer is switched to the first sampling rate, the counter is incremented by 1;
the counter is preset with an upper limit value M, and when the count of the counter reaches the upper limit value M, the judgment unit (202) stops judging the magnetic field measurement value B and the magnetic field threshold value L.
2. The method for automatically switching the sampling rate of a satellite-borne magnetometer according to claim 1, wherein in the step S3, when the sampling rate switching unit (203) switches the sampling rate of the magnetometer to the first sampling rate, the judging unit (202) stops the judgment of the magnetic field measurement value B and the magnetic field threshold value L until the timing of the timing unit (204) reaches the duration T.
3. The method for automatically switching the sampling rate of the satellite-borne magnetometer according to claim 1, wherein the setting process of the magnetic field threshold value L comprises the following steps: under the ground simulation environment, the range of a background interference magnetic field of the satellite-borne magnetometer is measured, the maximum value of the total field of the background interference magnetic field is determined to be B0, and then the magnetic field threshold value L is set to be L = B0+ B1 by combining the determined maximum value of the total field of the magnetic field of the target detection planet B1.
4. An automatic switching device for sampling rate of a satellite-borne magnetometer is characterized by comprising a parameter setting unit (201), a judging unit (202), a sampling rate switching unit (203) and a timing unit (204), wherein a first sampling rate and a second sampling rate are preset in the device, the first sampling rate is greater than the second sampling rate, the device is used for receiving a magnetic field measurement value B acquired by the magnetometer, and the device comprises a first sampling rate acquisition unit, a second sampling rate acquisition unit, a first sampling rate acquisition unit, a second sampling rate acquisition unit and a second sampling rate acquisition unit,
the parameter setting unit (201) is used for setting a magnetic field threshold value L and a duration time T;
the determination unit (202) is configured to determine whether the magnetic field measurement value B is greater than a magnetic field threshold value L:
if yes, the sampling rate of the magnetometer is switched to a first sampling rate by using the sampling rate switching unit (203), and when the timing unit (204) counts time and reaches the duration T, the sampling rate of the magnetometer is switched to a second sampling rate;
if not, continuously judging whether the magnetic field measurement value B is larger than the magnetic field threshold value L;
the continuous comparison time T2 is preset in the judgment unit (202), when the judgment unit (202) judges that the magnetic field measurement value B is greater than the magnetic field threshold value L within the continuous comparison time T2, the sampling rate of the magnetometer is switched to a first sampling rate by the sampling rate switching unit (203), and when the timing unit (204) counts time to reach the duration T; switching the sampling rate of the magnetometer to a second sampling rate;
the setting process of the continuous comparison time T2 comprises the following steps: under the ground simulation environment, measuring the maximum value T0 of the duration time of the instantaneous background interference magnetic field in the working environment of the satellite-borne magnetometer, and setting the continuous comparison time T2 as T2> T0;
the device also comprises a counter, and when the sampling rate of the magnetometer is switched to the first sampling rate, the counter is increased by 1;
the counter is preset with an upper limit value M, and when the count of the counter reaches the upper limit value M, the judgment unit (202) stops judging the magnetic field measurement value B and the magnetic field threshold value L.
5. The on-board magnetometer sampling rate automatic switching device of claim 4, wherein the sampling rate switching unit (203) comprises a 2-to-1 data selector, and the 2-to-1 data selector is used to switch between the first sampling rate and the second sampling rate.
6. An on-board magnetometer sampling rate auto-switching device according to claim 4 wherein said parameter setting unit (201) comprises registers for writing a magnetic field threshold L and duration T.
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