CN109039496B - Auxiliary measurement device and method for time delay change of bidirectional comparison modem - Google Patents
Auxiliary measurement device and method for time delay change of bidirectional comparison modem Download PDFInfo
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- CN109039496B CN109039496B CN201810964771.0A CN201810964771A CN109039496B CN 109039496 B CN109039496 B CN 109039496B CN 201810964771 A CN201810964771 A CN 201810964771A CN 109039496 B CN109039496 B CN 109039496B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/364—Delay profiles
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Abstract
The application discloses an auxiliary measurement device and method for time delay change of a bidirectional modulation modem. The apparatus, comprising: the device comprises a transmitting switch, a power control unit, a receiving switch and a main control unit: the transmitting switch is used for receiving the signal output by the modem and switching the signal to the satellite bidirectional comparison system or the power control unit; the power control unit is used for adjusting the power of the output signal of the transmitting switch according to a first threshold value and outputting a calibration signal; the receiving switch is used for selecting an output signal of the satellite bidirectional comparison system frequency conversion equipment and the calibration signal and generating a modem input intermediate frequency signal; the main control unit is used for controlling the path selection of the transmitting switch and the receiving switch and setting a first threshold value. The application also provides a measuring method using the device. Compared with the existing device and method for measuring the time delay change of the modem, the device and the method have the advantages of being suitable for a satellite bidirectional comparison system, simple in structure, flexible to apply and detachable.
Description
Technical Field
The invention relates to the field of satellite time synchronization bidirectional comparison, in particular to an auxiliary measurement device and method for time delay change of a satellite bidirectional comparison modem.
Background
The bidirectional time comparison method for satellite is a high-precision time transmission technique, and utilizes the forward time of geosynchronous communication satellite to transmit the timing modulation information between earth stations so as to implement time information interaction and high-precision time difference measurement of all stations.
In practical application, the variation of the channel delay of the ground station is a main error source influencing the bidirectional time comparison precision of the satellite, generally speaking, the whole satellite bidirectional time comparison system can be calibrated and evaluated through the satellite bidirectional time comparison calibration system (mobile reference station), the ground station channel delay calibration from an antenna end to the front end of a modem can also be realized through a satellite simulator method, but the measurement of the path delay of the modem is difficult, the measurement of the path delay of the modem can be realized through building a special system in the prior art, but the test method is complex and is not suitable for the satellite bidirectional time comparison system.
Disclosure of Invention
The application provides an auxiliary measurement device and method for time delay change of a bidirectional comparison modem, and solves the problems that the traditional measurement device and method are complex and are not suitable for a satellite bidirectional comparison system.
The embodiment of the application adopts the following technical scheme:
the embodiment of the application provides a device for assisting in measuring time delay change of a bidirectional comparison modem, which comprises: the device comprises a transmitting switch, a power control unit, a receiving switch and a main control unit: the transmitting switch is used for receiving the signal output by the modem and switching the signal to the satellite bidirectional comparison system or the power control unit; the power control unit is used for adjusting the power of the output signal of the transmitting switch according to a first threshold value and outputting a calibration signal; the receiving switch is used for selecting an output signal of the satellite bidirectional comparison system frequency conversion equipment and the calibration signal and generating a modem input intermediate frequency signal; the main control unit is used for controlling the path selection of the transmitting switch and the receiving switch and setting a first threshold value, the main control unit is connected with the transmitting switch, the power control unit and the receiving switch through a control bus, and the main control unit is connected with external equipment through a remote control interface.
Preferably, the temperature control device further comprises a temperature control unit for controlling the internal temperature of the device, the temperature control unit is connected with the main control unit through a control bus, and the main control unit is used for controlling the temperature adjustment threshold.
Preferably, the transmit switch and the receive switch are high isolation switches.
The embodiment of the application also provides an auxiliary measurement method for the time delay change of the bidirectional comparison modem, and the device comprises the following steps: disconnecting the intermediate frequency signal input end and the output end of the modem from the satellite bidirectional comparison system; adjusting the power of a signal output by a modem according to a first threshold value, and outputting a calibration signal; inputting the calibration signal into an intermediate frequency signal input end of a modem; measuring the self time delay of the modem under different code rates to obtain time delay measurement values under different code rates; calculating the average value of the delay measurement values at different code rates to obtain delay calibration values at different code rates; and connecting the intermediate frequency signal input end and the intermediate frequency signal output end of the modem to a satellite bidirectional comparison system.
Preferably, the step of calculating an average value of the delay measurement values at different code rates to obtain the delay calibration values at different code rates further includes: and reserving a middle value for the delay measurement values at different code rates, and eliminating two side values to obtain the optimized delay measurement values at different code rates.
Preferably, the first threshold is an intermediate frequency input signal power value of the modem in the normal comparison mode.
Preferably, the measurement time for measuring the self-delay of the modem at different code rates is 3 minutes.
Preferably, the number of reserved intermediate values is 120.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects: compared with the existing device and method for measuring the time delay change of the modem, the device and the method are suitable for a satellite bidirectional comparison system, simple in structure and flexible and detachable in application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic structural diagram of an embodiment of an auxiliary measurement device for time delay variation of a bidirectional modulation modem;
FIG. 2 is a schematic structural diagram of another embodiment of an auxiliary measurement device for time delay variation of a bidirectional modulation modem;
FIG. 3 is a flow chart of an embodiment of a method for aiding in the measurement of modem delay variation for two-way modulation;
fig. 4 is a flow chart of another embodiment of a method for aiding in the measurement of modem delay variation.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The satellite two-way time comparison method is a high-precision time transmission technology, which utilizes the forwarding time of a geosynchronous communication satellite to transmit timing modulation information between earth stations to realize time information interaction and high-precision time difference measurement of each station.
The satellite bidirectional time comparison system generally comprises two or more stations which work cooperatively, wherein each station mainly comprises a time transmission modem, a satellite transceiver, a satellite antenna and other equipment, and the symmetry of a bidirectional transmission link is utilized to eliminate path delay so as to realize nanosecond-level time difference measurement. However, in practical applications, the variation of the ground station channel delay is a main error source affecting the satellite bidirectional time comparison accuracy, generally speaking, the whole satellite bidirectional time comparison system can be calibrated and evaluated by a satellite bidirectional time comparison calibration system (mobile reference station), and the ground station channel delay calibration from an antenna end to a front end of a modem can also be realized by a satellite simulator method, but the absolute calibration of the path delay of the modem itself, especially the calibration of the absolute delay of a transmitting channel and a receiving channel, is very difficult, and although the calibration can be realized by building a special system, the test method is complex and is not suitable for the satellite bidirectional time comparison system.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an embodiment of an auxiliary measurement device for time delay variation of a bidirectional modulation modem. The utility model provides a two-way ratio is to supplementary measuring device of modem time delay change, includes: a transmitting switch 11, a power control unit 12, a receiving switch 13, a main control unit 14: the transmitting switch 11 is used for receiving a signal output by the modem and switching the signal to a satellite bidirectional comparison system or a power control unit 12; the power control unit 12 is configured to adjust the power of the output signal of the transmission switch according to a first threshold, and output a calibration signal; the receiving switch 13 is configured to select an output signal of a satellite bidirectional comparison system frequency conversion device and the calibration signal, and generate a modem input intermediate frequency signal; the main control unit 14 is configured to control path selection of the transmitting switch 11 and the receiving switch 13, and set a first threshold, the main control unit 14 is connected to the transmitting switch 11, the power control unit 12, and the receiving switch 13 through a control bus, and the main control unit 14 is connected to an external device through a remote control interface.
When the modem needs calibration, the transmitting switch 11 is switched to one end of the power control unit 12, a signal output by the modem enters the power control unit 12 through the transmitting switch 11, the power control unit 12 is generally an attenuator or an amplifying device, and the power of the output signal of the transmitting switch 11 is adjusted according to a first threshold value, which is determined by a person skilled in the art according to the allowable input power and the measurement convenience of the intermediate frequency signal input end of the modem, for example, equal to the intermediate frequency input signal power of the modem in the normal comparison mode, which is not specifically limited herein. The power control unit 12 outputs a calibration signal, the receiving switch 13 is switched to one end of the calibration signal, and the calibration signal is input to an intermediate frequency signal input end of the modem; the modem completes the measurement of time delay; after the measurement is completed, the transmitting switch 11 and the receiving switch 13 are switched to the satellite bidirectional comparison system, and the normal comparison mode is recovered. The main control unit 14 is connected to the transmitting switch 11, the power control unit 12, and the receiving switch 13 through a control bus, and is connected to an external device through a remote control interface, and is configured to control switching between the normal comparison mode and the calibration mode, and path selection between the transmitting switch 11 and the receiving switch 13, and set a first threshold. The time delay measured by the modem includes the time delay of the modem itself and the time delay of the line, except the power control unit 12, the modem and the whole line are both accessed to the bidirectional comparison system in the normal comparison mode, and the time delay of the power control unit 12 can be ignored for measuring the whole time delay. The auxiliary measuring device for the time delay change of the bidirectional comparison modem is connected into a satellite bidirectional comparison system in a normal comparison mode, when the modem needs to be calibrated, time delay measurement can be carried out by switching modes through the main control unit, and normal comparison mode can be recovered by switching the main control unit back to the normal comparison mode after measurement is finished.
Preferred embodiments: the transmitting switch 11 and the receiving switch 13 are high-isolation switches as described above.
Fig. 2 is a schematic structural diagram of another embodiment of an auxiliary measurement device for time delay variation of a bidirectional modulation modem. The utility model provides a two-way ratio is to supplementary measuring device of modem time delay change, includes: a transmitting switch 11, a power control unit 12, a receiving switch 13 and a main control unit 14; also included is a temperature control unit 25: the temperature control unit 25 is used for controlling the internal temperature of the device, the temperature control unit 25 is connected with the main control unit 14 through a control bus, and the main control unit 14 is used for controlling a temperature adjustment threshold.
The temperature control unit 25 is connected with the main control unit 14 through a control bus, and is used for controlling the internal temperature of the device, so that the self time delay stability of the measurement and calibration device is ensured. The temperature control unit 25 adjusts the internal temperature of the system according to a temperature adjustment threshold determined by those skilled in the art according to device performance and application environment, and is not particularly limited herein. The temperature adjustment threshold is set and adjusted by the master control unit 14.
Preferred embodiments: the transmitting switch 11 and the receiving switch 13 are high-isolation switches as described above.
Fig. 3 is a flow chart of an embodiment of a method for assisting in measuring modem delay variation in two-way modulation. The method for auxiliary measurement of the time delay change of the bidirectional comparison modem provided by the embodiment of the application comprises the following steps:
step 101: and disconnecting the intermediate frequency signal input end and the intermediate frequency signal output end of the modem from the satellite bidirectional comparison system.
The method comprises the steps of preparing for time delay measurement of the modem, respectively connecting an intermediate frequency signal input end and an intermediate frequency signal output end of the modem to a satellite bidirectional comparison system in a normal comparison mode, and disconnecting the intermediate frequency signal input end and the intermediate frequency signal output end of the modem from the satellite bidirectional comparison system.
Step 102: and adjusting the power of the output signal of the modem according to a first threshold value, and outputting a calibration signal.
This step is performed because the power of the modem output signal may not be within the range of the allowable input power of the modem if signal input terminal or is not favorable for measurement, and therefore, the power of the modem output signal needs to be adjusted according to a first threshold value, which is determined by a person skilled in the art according to the allowable input power of the modem if signal input terminal and the convenience of measurement, for example, equal to the if input signal power of the modem in the normal comparison mode, which is not specifically limited herein. The adjusted output signal is a calibration signal.
For example, if the allowable input power range of the intermediate frequency signal input end of the modem is-40 dBm-0 dBm, the power of the output signal of the modem is-10 dBm, and the first threshold value is set to-30 dBm, the power of the output signal of the modem is attenuated, and the power value of the output calibration signal is-30 dBm.
As mentioned above, in step 102, the first threshold is the power value of the if input signal of the modem in the normal comparison mode.
The first threshold is not specifically limited in step 102, and it is preferable that the first threshold is set to a power value of the intermediate frequency input signal of the modem in the normal comparison mode, in which case the obtained delay calibration value is closer to the actual delay value. The first threshold may be other values, and is not particularly limited herein.
For example, if the power value of the if input signal of the modem is-30 dBm in the normal alignment mode, the first threshold is set to-30 dBm.
Step 103: and inputting the calibration signal into an intermediate frequency signal input end of a modem.
This step is to form a closed loop by inputting the calibration signal into the if signal input of the modem, in preparation for the measurement.
Step 104: and measuring the self time delay of the modem under different code rates to obtain time delay measurement values under different code rates.
This step is because the delay measurement values of the modems at different code rates are different, so it is necessary to make a prior agreement to measure the self-delays of the modems at different code rates. The measurements are made and stored by the modem.
It should be noted that, each time the system is restarted or powered on, the delay of the modem at different code rates needs to be re-measured.
As mentioned above in step 104, the measurement time for measuring the self-delay of the modem at different code rates is preferably 3 minutes.
The measurement time may be other values, and is not particularly limited herein.
Step 105: and calculating the average value of the delay measurement values at different code rates to obtain the delay calibration values at different code rates.
The step is to take the average value of the multiple measured values under different code rates respectively to obtain the time delay calibration values under different code rates respectively, so as to improve the precision.
For example, 120 measurements are respectively made at different code rates, and the measured values at different code rates are respectively averaged to obtain the delay calibration values at different code rates.
Step 106: and connecting the intermediate frequency signal input end and the intermediate frequency signal output end of the modem to a satellite bidirectional comparison system.
The step is that the measurement is finished, the intermediate frequency signal input end and the output end of the modem are connected back to the satellite bidirectional comparison system, and the normal comparison mode is recovered.
Fig. 4 is a flow chart of another embodiment of a method for aiding in the measurement of modem delay variation. Another embodiment of the present application provides an auxiliary measurement method for delay variation of a bidirectional modulation modem, including the following steps:
step 201: and disconnecting the intermediate frequency signal input end and the intermediate frequency signal output end of the modem from the satellite bidirectional comparison system. (same step 101)
Step 202: and adjusting the power of the output signal of the modem according to a first threshold value, and outputting a calibration signal. (same step 102)
Step 203: and inputting the calibration signal into an intermediate frequency signal input end of a modem. (same step 103)
Step 204: and measuring the self time delay of the modem under different code rates to obtain time delay measurement values under different code rates. (same step 104)
Step 205: and reserving a middle value for the delay measurement values at different code rates, and eliminating two side values to obtain the optimized delay measurement values at different code rates.
The step is to arrange the time delay measurement values under different code rates according to the order of magnitude, eliminate the numerical values with larger deviation at two sides, reserve the residual numerical values in the middle, and then calculate the average value to improve the accuracy of the time delay calibration value. The number of measured values and the number of rejected values are determined by those skilled in the art based on experience and convenience of measurement, and are not specifically limited herein.
For example, 124 delay measurement values are obtained at a certain code rate, the 122 delay measurement values are arranged according to the size sequence, 4 values with larger deviation on two sides are removed, and the remaining 120 delay measurement values are reserved.
In step 205, the number of reserved intermediate values is preferably 120.
The number of the reserved intermediate values may be other values, and is not particularly limited herein.
Step 206: and calculating the average value of the delay measurement values at different code rates to obtain the delay calibration values at different code rates. (same step 105)
Step 207: and connecting the intermediate frequency signal input end and the intermediate frequency signal output end of the modem to a satellite bidirectional comparison system. (same step 106)
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (7)
1. An apparatus for assisting in measuring a delay variation of a bi-directional modem, comprising: the device comprises a transmitting switch, a power control unit, a receiving switch, a main control unit and a temperature control unit:
the transmitting switch is used for receiving the signal output by the modem and switching the signal to the satellite bidirectional comparison system or the power control unit;
the power control unit is used for adjusting the power of the output signal of the transmitting switch according to a first threshold value and outputting a calibration signal;
the receiving switch is used for selecting an output signal of the satellite bidirectional comparison system frequency conversion equipment and the calibration signal and generating a modem input intermediate frequency signal;
the main control unit is used for controlling the path selection of the transmitting switch and the receiving switch and setting a first threshold value, the main control unit is connected with the transmitting switch, the power control unit and the receiving switch through a control bus, and the main control unit is connected with external equipment through a remote control interface;
the temperature control unit is used for controlling the internal temperature of the device and is connected with the main control unit through a control bus, and the main control unit is used for controlling a temperature adjustment threshold;
the auxiliary measuring device for the time delay change of the bidirectional comparison modem is connected to a satellite bidirectional comparison system in a normal comparison mode, mode switching is carried out through the main control unit to carry out time delay measurement when the modem is calibrated, and the main control unit is switched back to the normal comparison mode after measurement is finished to recover normal work;
when the system is restarted or powered on each time, the time delay of the modem under different code rates is remeasured; the measurements are made and stored by the modem.
2. The apparatus of claim 1, wherein the transmit switch and the receive switch are high isolation switches.
3. An auxiliary measurement method for time delay variation of a bidirectional comparison modem, which uses the device of any one of claims 1-2, and is characterized by comprising the following steps:
disconnecting the intermediate frequency signal input end and the output end of the modem from the satellite bidirectional comparison system;
adjusting the power of a signal output by a modem according to a first threshold value, and outputting a calibration signal;
inputting the calibration signal into an intermediate frequency signal input end of a modem;
measuring the self time delay of the modem under different code rates to obtain time delay measurement values under different code rates;
calculating the average value of the delay measurement values at different code rates to obtain delay calibration values at different code rates;
and connecting the intermediate frequency signal input end and the intermediate frequency signal output end of the modem to a satellite bidirectional comparison system.
4. The method of claim 3, wherein the step of calculating the average of the delay measurements at different code rates to obtain the delay calibration values at different code rates further comprises:
and reserving a middle value for the delay measurement values at different code rates, and eliminating two side values to obtain the optimized delay measurement values at different code rates.
5. A method as claimed in any one of claims 3 to 4, wherein the first threshold is the IF input signal power level of the modem in the normal alignment mode.
6. An auxiliary measurement method for the delay variation of a bi-directional ratio modem according to any one of claims 3 to 4, characterized in that the measurement time for measuring the self-delay of the modem at different code rates is 3 minutes.
7. The method of claim 4, wherein the number of reserved intermediate values is 120.
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