CN104316047A - Method for automatically improving time mark precision of sensor data by utilizing GPS (global positioning system) - Google Patents
Method for automatically improving time mark precision of sensor data by utilizing GPS (global positioning system) Download PDFInfo
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- CN104316047A CN104316047A CN201410532526.4A CN201410532526A CN104316047A CN 104316047 A CN104316047 A CN 104316047A CN 201410532526 A CN201410532526 A CN 201410532526A CN 104316047 A CN104316047 A CN 104316047A
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- gps
- pps
- pulse per
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/02—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by astronomical means
- G01C21/025—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by astronomical means with the use of startrackers
Abstract
The invention relates to a method for automatically improving the time mark precision of sensor data by utilizing a GPS (global positioning system). The method comprises the steps: (1) arranging a GPS second pulse counter and a sensor synchronous signal counter on a satellite-borne computer; (2) obtaining a satellite time count value of the GPS second pulse by utilizing the GPS second pulse counter, and receiving an absolute satellite time value of the GPS second pulse; (3) obtaining a satellite time count value of the sensor by utilizing the sensor synchronous signal counter; and (4) obtaining an absolute satellite time corresponding to the sensor at the synchronous moment according to the satellite time count value and the absolute satellite time value of the GPS second pulse as well as the satellite time count value of the sensor. By adopting the method, the timing precision of the satellite-borne computer local clock can be improved, and the high-precision time mark can be marked on the acquired sensor data.
Description
Technical field
The present invention relates to the technical field of research improving sensor data markers precision, particularly a kind of GPS of utilization independently improves the method for sensor data markers precision.
Background technology
Usually adopt based on quartz oscillator as local clock in spaceborne computer, but due to the Q value of quartz crystal very high, therefore quartz crystal self-characteristic changes on the impact of oscillator precision greatly.Select the databook of crystal oscillator according to spaceborne computer, the error of crystal oscillator can be divided into initial error, temperature error and ageing error three part, and the deviation accumulation of three parts can reach 60ppm.
Spaceborne computer completes the calibration of absolute time by receiving external GPS pps pulse per second signal, but there is deviation and drift due to local crystal oscillator, causes down-transmitting data markers precision directly related with local crystal oscillator output characteristics.If the error of crystal oscillator reaches 60ppm, then 60us is reached to the most senior general of target accuracy error during sensor in 1s.
Improve the output accuracy of local crystal oscillator, sensor output data markers precision can be improved.Method can be real-time testing environment temperature, vary with temperature rule according to frequency and change the electric capacity with crystalline tandem, thus fine tuning vibration frequency, make it stable (Wang Yan, Huang Xianhe, Yan Liqun, high precision low noise integrated temperature compensated crystal oscillator [J], piezoelectricity and acousto-optic, 2010,32 (6): 909-911); Also can be by selecting constant-temperature crystal oscillator (Liu Hui, high Jianning, Zhou Wei, the design and implimentation [J] of the accurate OCXO of a kind of novel self calibration, electronic measurement technique, 2011,34 (8): 106-109) reach the output of high stable, but these methods will increase the volume of unit, power consumption and cost.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of GPS of utilization is provided independently to improve the method for sensor data markers precision, the method is when spaceborne computer uses the crystal oscillator of general precision, the GPS pps pulse per second signal utilizing number pipe computing machine to send improves the punctual precision of local clock, stamps high precision markers to the sensor data collected.
Above-mentioned purpose of the present invention is achieved by following technical solution:
Utilize GPS independently to improve a method for sensor data markers precision, comprise the following steps:
(1), a GPS pulse per second (PPS) counter and a sensor synchronizing signal counter are set respectively in spaceborne computer; Wherein, the input clock of described GPS pulse per second (PPS) counter and sensor synchronizing signal counter produces by the local clock frequency division of spaceborne computer, and the equivalent of described input clock is T
unit;
(2), pipe computing machine transmission GPS pps pulse per second signal is counted to spaceborne computer, and at T
gPSafter time, to spaceborne computer when sending absolute star corresponding to described GPS pps pulse per second signal; Spaceborne computer receives the GPS pps pulse per second signal that number pipe computing machine sends, and utilizes GPS pulse per second (PPS) counter to latch the star hour counter value of local crystal oscillator record at the negative edge of described GPS pps pulse per second signal, count value T during star as GPS pulse per second (PPS)
mmc(n), and when spaceborne computer receives and preserves absolute star corresponding to described GPS pps pulse per second signal that number pipe computing machine sends, as the absolute star duration t of GPS pulse per second (PPS)
mmc(n); Wherein n is counting sequence number, n=1,2 ..., N, N are positive integer;
(3), spaceborne computer receives the synchronizing signal that sensor sends, and utilizes sensor synchronizing signal counter to latch the star hour counter value of local crystal oscillator record at the negative edge of described synchronizing signal, count value T during star as sensor
sTS(n);
(4) count value T during star, according to n-th and (n-1)th GPS pulse per second (PPS)
mmc(n) and T
mmc, and the input clock equivalent T of GPS pulse per second (PPS) counter (n-1)
unit, calculate by following formula the time interval T that spaceborne computer receives GPS pulse per second (PPS)
gPS_local(n):
T
GPS_local(n)＝[T
mmc(n)-T
mmc(n-1)]T
unit
(5) spaceborne computer, step (4) obtained receives the time interval T of GPS pulse per second (PPS)
gPS_localthe actual cycle value T of (n) and GPS pps pulse per second signal
gbe divided by and obtain Z-factor variable K
t(n), namely
then to described Z-factor variable K
tn () obtains the constant value deviation K of spaceborne computer local clock after carrying out low-pass filtering treatment
t(n);
(6), according to the GPS pulse per second (PPS) absolute star duration t that step (2) obtains
mmccount value T during the star of (n), GPS pulse per second (PPS)
mmccount value T during the star of n sensor that () and step (3) obtain
sTS(n), and the constant value deviation K of spaceborne computer local clock that step (5) obtains
t(n), t when obtaining absolute star corresponding to the synchronization point of sensor by following formulae discovery
sts(n):
t
sts(n)＝t
mmc(n)+[T
STS(n)-T
mmc(n)]K
t(n)。
Independently improve in the method for sensor data markers precision at the above-mentioned GPS that utilizes, the input clock equivalent T of GPS pulse per second (PPS) counter and sensor synchronizing signal counter
unitbe less than the time accuracy value of system index requirement.
Independently improve in the method for sensor data markers precision at the above-mentioned GPS that utilizes, the input clock equivalent T of GPS pulse per second (PPS) counter and sensor synchronizing signal counter
unitthe ratio of the time accuracy value required with system index is less than or equal to 0.1.
Independently improve in the method for sensor data markers precision, to Z-factor variable K in step (5) at the above-mentioned GPS that utilizes
tn () is carried out low-pass filtering treatment and is realized Z-factor variable K
tthe smothing filtering of (n).
Independently improve in the method for sensor data markers precision at the above-mentioned GPS that utilizes, in step (2), number pipe computing machine sends GPS pps pulse per second signal to spaceborne computer, and at T
gPSafter time, to spaceborne computer when sending absolute star corresponding to described GPS pps pulse per second signal, wherein T
gPS<1 second.
The present invention compared with prior art has following beneficial effect:
(1), two counters are adopted to carry out timing to the due in of the GPS pulse per second (PPS) received and sensor synchronizing signal respectively in the present invention, wherein the input clock of two counters produces by the local clock frequency division of spaceborne computer, and provided by several pipe computing machine during the absolute star of GPS pulse per second (PPS), when therefore can calculate absolute star corresponding to the synchronization point of sensor by the time response of GPS pps pulse per second signal, high precision markers is stamped at the sensor data collected, work when can complete high-precision school, and improve the punctual ability of spaceborne computer;
(2), because the present invention utilizes GPS independently to improve sensor data markers precision, spaceborne computer is when adopting the crystal oscillator of medium accuracy, still the timer error of sensor can effectively be controlled, when the input clock equivalent of two counters is 1us, can guarantee that sensor timer error is within 10us;
(3), the present invention utilizes GPS independently to improve sensor data markers precision, guarantees the markers precision of spaceborne calculating when adopting the crystal oscillator of medium accuracy, and after adopting the method to compensate, markers precision can be better than 5us; And weight, the power consumption of spaceborne computer can be effectively reduced due to the crystal oscillator that have employed medium accuracy, improve the reliability of product.
Accompanying drawing explanation
Sequential chart when Fig. 1 is school of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Spaceborne computer is when using general precision crystal oscillator, markers precision can not meet index request, and the method that GPS of the present invention independently improves sensor data markers precision utilizes outside GPS pps pulse per second signal to improve the punctual precision of local clock, stamp high precision markers to the sensor data collected.
During school of the present invention, sequential chart is as described in Figure 1, and the method treatment step independently improving sensor data markers precision according to this sequential chart GPS of utilization of the present invention is:
(1), a GPS pulse per second (PPS) counter and a sensor synchronizing signal counter are set respectively in spaceborne computer; Wherein, GPS pulse per second (PPS) counter and sensor synchronizing signal counter input clock produce by the local clock frequency division of spaceborne computer, the equivalent of this input clock is T
unit; Equivalent T
unitbe less than the time accuracy value of system index requirement, 1/10th of the time accuracy value of selecting system index request, if the time precision that namely system index requires is 10us, then the input clock equivalent T of counter
unitbe chosen for 1us;
(2), pipe computing machine transmission GPS pps pulse per second signal is counted to spaceborne computer, and at T
gPSafter time, to spaceborne computer when sending absolute star corresponding to described GPS pps pulse per second signal by 1553B bus; Spaceborne computer receives the GPS pps pulse per second signal that number pipe computing machine sends, and utilizes GPS pulse per second (PPS) counter to be latched the star hour counter value of local crystal oscillator record by hardware at the negative edge of described GPS pps pulse per second signal, count value T during star as GPS pulse per second (PPS)
mmc(n), and when spaceborne computer receives and preserves absolute star corresponding to described GPS pps pulse per second signal that number pipe computing machine sends, as the absolute star duration t of GPS pulse per second (PPS)
mmc(n); Wherein n is counting sequence number, n=1,2 ..., N, N are positive integer; T in the present embodiment
gPS<1 second.
(3), spaceborne computer receives the synchronizing signal that sensor sends, and utilizes sensor synchronizing signal counter to be latched the star hour counter value of local crystal oscillator record by hardware at the negative edge of described synchronizing signal, count value T during star as sensor
sTS(n);
(4) count value T during star, according to n-th and (n-1)th GPS pulse per second (PPS)
mmc(n) and T
mmc, and the input clock equivalent T of GPS pulse per second (PPS) counter (n-1)
unit, calculate by following formula the time interval T that spaceborne computer receives GPS pulse per second (PPS)
gPS_local(n):
T
GPS_local(n)＝[T
mmc(n)-T
mmc(n-1)]T
unit
(5) spaceborne computer, step (4) obtained receives the time interval T of GPS pulse per second (PPS)
gPS_localthe actual cycle value T of (n) and GPS pps pulse per second signal
gbe divided by and obtain Z-factor variable K
t(n), namely
then to described Z-factor variable K
tn () obtains the constant value deviation K of spaceborne computer local clock after carrying out low-pass filtering treatment
tn (), namely to described Z-factor variable K
tthe constant value deviation K of spaceborne computer local clock is obtained after (n) smoothing filtering process
t(n);
(6), according to the GPS pulse per second (PPS) absolute star duration t that step (2) obtains
mmccount value T during the star of (n), GPS pulse per second (PPS)
mmccount value T during the star of n sensor that () and step (3) obtain
sTS(n), and the constant value deviation K of spaceborne computer local clock that step (5) obtains
t(n), t when obtaining absolute star corresponding to the synchronization point of sensor by following formulae discovery
sts(n):
t
sts(n)＝t
mmc(n)+[T
STS(n)-T
mmc(n)]K
t(n)。
Certain satellite computer for controlling have employed the method, can be found out by telemetry, the markers precision before compensation is at about 30us, and after adopting the method to compensate, markers precision can be better than 5us.
The above; be only the embodiment of the best of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
The content be not described in detail in instructions of the present invention belongs to the known technology of professional and technical personnel in the field.
Claims (5)
1. utilize GPS independently to improve a method for sensor data markers precision, it is characterized in that comprising the following steps:
(1), a GPS pulse per second (PPS) counter and a sensor synchronizing signal counter are set respectively in spaceborne computer; Wherein, the input clock of described GPS pulse per second (PPS) counter and sensor synchronizing signal counter produces by the local clock frequency division of spaceborne computer, and the equivalent of described input clock is T
unit;
(2), pipe computing machine transmission GPS pps pulse per second signal is counted to spaceborne computer, and at T
gPSafter time, to spaceborne computer when sending absolute star corresponding to described GPS pps pulse per second signal; Spaceborne computer receives the GPS pps pulse per second signal that number pipe computing machine sends, and utilizes GPS pulse per second (PPS) counter to latch the star hour counter value of local crystal oscillator record at the negative edge of described GPS pps pulse per second signal, count value T during star as GPS pulse per second (PPS)
mmcn (), when spaceborne computer receives and preserves absolute star corresponding to described GPS pps pulse per second signal that number pipe computing machine sends, as the absolute star duration t of GPS pulse per second (PPS)
mmc(n); Wherein n is counting sequence number, n=1,2 ..., N, N are positive integer;
(3), spaceborne computer receives the synchronizing signal that sensor sends, and utilizes sensor synchronizing signal counter to latch the star hour counter value of local crystal oscillator record at the negative edge of described synchronizing signal, count value T during star as sensor
sTS(n);
(4) count value T during star, according to n-th and (n-1)th GPS pulse per second (PPS)
mmc(n) and T
mmc, and the input clock equivalent T of GPS pulse per second (PPS) counter (n-1)
unit, calculate by following formula the time interval T that spaceborne computer receives GPS pulse per second (PPS)
gPS_local(n):
T
GPS_local(n)＝[T
mmc(n)-T
mmc(n-1)]T
unit
(5) spaceborne computer, step (4) obtained receives the time interval T of GPS pulse per second (PPS)
gPS_localthe actual cycle value T of (n) and GPS pps pulse per second signal
gbe divided by and obtain Z-factor variable K
t(n), namely
then to described Z-factor variable K
tn () obtains the constant value deviation K of spaceborne computer local clock after carrying out low-pass filtering treatment
t(n);
(6), according to the GPS pulse per second (PPS) absolute star duration t that step (2) obtains
mmccount value T during the star of (n), GPS pulse per second (PPS)
mmccount value T during the star of n sensor that () and step (3) obtain
sTS(n), and the constant value deviation K of spaceborne computer local clock that step (5) obtains
t(n), t when obtaining absolute star corresponding to the synchronization point of sensor by following formulae discovery
sts(n):
t
sts(n)＝t
mmc(n)+[T
STS(n)-T
mmc(n)]K
t(n)。
2. a kind of GPS of utilization according to claim 1 independently improves the method for sensor data markers precision, it is characterized in that, the input clock equivalent T of GPS pulse per second (PPS) counter and sensor synchronizing signal counter
unitbe less than the time accuracy value of system index requirement.
3. a kind of GPS of utilization according to claim 2 independently improves the method for sensor data markers precision, it is characterized in that, the input clock equivalent T of GPS pulse per second (PPS) counter and sensor synchronizing signal counter
unitthe ratio of the time accuracy value required with system index is less than or equal to 0.1.
4. a kind of GPS of utilization according to claim 1 independently improves the method for sensor data markers precision, it is characterized in that, to Z-factor variable K in step (5)
tn () is carried out low-pass filtering treatment and is realized Z-factor variable K
tthe smothing filtering of (n).
5. a kind of GPS of utilization according to claim 1 independently improves the method for sensor data markers precision, it is characterized in that, in step (2), number pipe computing machine sends GPS pps pulse per second signal to spaceborne computer, and at T
gPSafter time, to spaceborne computer when sending absolute star corresponding to described GPS pps pulse per second signal, wherein T
gPS<1 second.
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| CN115242577A (en) * | 2022-07-27 | 2022-10-25 | 天津津航计算技术研究所 | Bus data conversion device and timekeeping and time service control method thereof |
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