CN110764118A - Calibration and calibration method and device for RDSS user machine test system - Google Patents
Calibration and calibration method and device for RDSS user machine test system Download PDFInfo
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Abstract
The invention relates to a calibration and calibration method and device for a RDSS (radio data service) user machine test system, belonging to the technical field of RDSS user machine test. Acquiring an inbound signal of the RDSS user machine or an inbound signal simulated by an RDSS inbound analog source through a portable calibration and calibration device, and synchronously playing back the inbound signal to the RDSS user machine test system; the tracing and metering of the bidirectional zero value, the EIRP value and the pseudo-range measurement precision index are realized, and the EIRP value and the pseudo-range measurement precision are traversed in the index range. The invention has the advantages that the indexes of the first-direction zero value, the EIRP value and the pseudo-range measurement precision can be traced and measured, and the EIRP value and the pseudo-range measurement precision traverse in the index range. And secondly, as a third-party device, fairness is ensured. And thirdly, because the portable device is provided with a battery, a touch screen and keys, and can be operated by a single machine, the portable device is very convenient to carry to test systems in different places for comparison.
Description
Technical Field
The invention relates to a calibration and calibration method and device for a RDSS (radio data service) user machine test system, belonging to the technical field of RDSS user machine test.
Background
With the common application of the Beidou RDSS user machine in various industries, RDSS user machine test systems are built by various large user machine manufacturers, quality certification detection centers and comparison and test general units and are used for testing the functional performance of the RDSS user machine in a darkroom. However, a problem is also brought about, the RDSS client test system is not built by one manufacturer, and sizes of different darkrooms are different, so that consistency of test results of different RDSS client test systems is guaranteed. However, this approach has three problems: firstly, the test result of the RDSS user machine test system used as the reference can not ensure traceability and credibility by 100 percent; secondly, the stability and reliability of the user machine serving as the comparison golden machine are also problematic, and particularly all situations can not be traversed by the EIRP and the pseudo-range measurement precision; thirdly, when the user machine as a golden machine is taken to a test system of another user machine manufacturer for comparison, the fairness aspect is questioned due to monopoly.
The existing patent and paper are concerned about the self calibration of the test system, and the RDSS user machine index test method, and related paper or patent of calibrating a standard 'golden machine' is not provided.
Disclosure of Invention
The invention aims to provide a calibration and calibration method and device for an RDSS user machine test system, which are used for calibrating and calibrating different RDSS user machine test systems and ensuring the consistency of test results of the RDSS user machine test systems scattered all over the country, thereby overcoming the defects of the prior art.
When the RDSS user machine testing system tests the RDSS user machine performance indexes, three indexes need calibration and calibration: two-way zero value, EIRP value and pseudorange measurement accuracy. The definition of the bidirectional zero value is the time delay from the antenna aperture surface of the RDSS user machine to the time delay from the antenna aperture surface of the incoming signal to the antenna aperture surface of the outgoing signal, the EIRP value is the equivalent omnidirectional transmitting power of the RDSS user machine, and the pseudo-range measurement accuracy is an index of the RDSS user machine test system for receiving the incoming signal.
The invention is realized by the following technical scheme that the portable calibration and calibration device synchronously acquires the inbound signals of the RDSS user machine when the RDSS user machine test system tests the bidirectional zero-value index of the RDSS user machine; when the EIRP value and the pseudo-range measurement accuracy of the RDSS user machine are tested, different EIRP and different pseudo-range inbound signals simulated by an RDSS inbound analog source are collected and then synchronously played back to the RDSS user machine test system to be calibrated and calibrated respectively, and consistency comparison and calibration between different test systems are realized by comparing whether the test results of the bidirectional zero value, the EIRP value and the pseudo-range measurement accuracy of the RDSS user machine test system to be calibrated and calibrated are in accordance with expectations or not. And calibrating the RDSS user machine test system to be calibrated in the range of the EIRP and the pseudo-range measurement accuracy indexes by collecting and replaying inbound signals corresponding to different EIRP values and different pseudo-range measurement accuracies.
Since the portable calibration device causes an extra time delay T1 when the inbound signal is synchronously captured, an extra time delay (T2-T1) is also introduced when the inbound signal is played back, that is, the portable calibration device captures the played back inbound signal and introduces an extra T2 time delay, which results in an extra T2 added to the bi-directional zero value, as shown in fig. 5. However, the extra time delay T2 is eliminated by comparison and calibration through high-speed oscilloscope acquisition and zero value calculation software, the method is to calculate the inbound signal zero value of the RDSS user machine and the inbound signal zero value played back by the portable calibration and calibration device, respectively, the difference is calculated to obtain T2, and the zero value test method is mature and will not be described in detail here.
The calibration and calibration method for the bidirectional zero value comprises the following steps that assuming that the zero value of the outbound signal of the RDSS user machine test system is calibrated, the extra time delay caused by the acquisition and playback of the inbound signal by the portable calibration and calibration device is also calibrated to be zero, and no consideration is given here:
step 1.1, connecting 1PPS output and 10MHz of a test system to a portable calibration device, dividing incoming signals of the RDSS user machine into two paths, connecting one path to the RDSS user machine test system, connecting the other path to the portable calibration device, and connecting outgoing signals of the test system to a signal input end of the RDSS user machine. The 1PPS connection of the test system is used for time synchronization; the 10MHz connection ensures that the test system and the portable calibration and calibration device are homologous, and the signal drifts when different sources are different, which is the prior art.
Step 1.2, starting a RDSS user machine test system, selecting a test bidirectional zero-value test item, setting a portable calibration device to start to acquire signals when simulating an RDSS outbound signal to the RDSS user machine, using a 1PPS signal rising edge as a trigger by the portable calibration device, starting to synchronously acquire and store inbound signals of the RDSS user machine at the next 1PPS rising edge moment until the bidirectional zero-value test item is finished, and setting the portable calibration device to finish acquiring the signals; and (3) judging whether the bidirectional zero-value test result of the test system meets the index requirement, if so, entering the next step, if not, replacing the RDSS user machine, repeating the step 1.1 until the bidirectional zero-value test result of the test system meets the index requirement, and calling the inbound signal acquired at the moment as a verified inbound signal.
Step 1.3, disconnecting the connection between the inbound signal of the RDSS subscriber machine and the RDSS subscriber machine test system, connecting the output of the portable calibration and calibration device to the RDSS subscriber machine test system, continuously selecting a test bidirectional zero value test item, setting the portable calibration and calibration device to start replaying the inbound signal acquired in the step 1.1, and synchronously replaying the verified inbound signal by the portable calibration and calibration device at the next rising edge moment of the 1PPS signal until the test item is finished; and comparing whether the two-way zero value test value of the RDSS user machine test system meets the index requirement, so as to judge whether the extra time delay T2 caused by the acquisition and playback of the inbound signal by the portable calibration and calibration device is calibrated to be zero or not, and whether the portable calibration and calibration device works normally or not. If yes, the next step is carried out, if not, the portable calibration device is replaced, the acquisition playback time delay of the portable calibration device is calibrated again, and the steps 1.2 to 1.3 are repeated.
Step 1.4, when calibrating and calibrating the RDSS client test system to be calibrated and calibrated, simultaneously connecting 1PPS output and 10MHz of the RDSS client test system to be calibrated and calibrated to a portable calibration device, connecting the output of the portable calibration device to the RDSS client test system to be calibrated and calibrated, connecting the outbound signal output of the RDSS client test system to be calibrated and calibrated to a signal receiving end of the RDSS client, selecting to run the same bidirectional zero-value test scene, setting the portable calibration device to start playback of verified inbound signals, and synchronously playing back the stored verified inbound signals to the RDSS client test system to be calibrated and calibrated by the portable calibration device at the next rising edge of 1PPS until the test item is finished; and judging whether the bidirectional zero-value test result of the test system is accurate or not by comparing whether the test result of the bidirectional zero-value on the RDSS user machine test system to be calibrated meets the index requirement or not.
The calibration and calibration method of the EIRP value comprises the following steps:
step 2.1, setting an inbound signal analog source of the RDSS user machine to simulate inbound signals with different EIRP transmitting powers, and respectively collecting the inbound signals corresponding to the different EIRPs by using a portable calibration and calibration device;
step 2.2, setting the portable calibration and calibration device to replay the inbound signals corresponding to the different EIRPs acquired in the step 2.1 to a standard power meter and a frequency spectrometer, and measuring and testing power values of the inbound signals corresponding to the different EIRPs;
and 2.3, running an inbound EIRP value test project by the RDSS user machine test system to be calibrated and calibrated, replaying the inbound signals corresponding to the EIRPs with different powers acquired in the step 2.1 to the RDSS user machine test system to be calibrated and calibrated by the portable calibration device, recording each EIRP value test result, comparing the EIRP value test result with the power value in the step 2.2, and obtaining an EIRP value test error of the test system by calculating a difference value.
The calibration and calibration method of the pseudo-range measurement precision comprises the following steps:
step 3.1, setting an inbound signal analog source of the RDSS user machine to simulate inbound signals of different pseudo ranges, and respectively acquiring the inbound signals corresponding to the different pseudo ranges by using a portable calibration device;
step 3.2, setting the portable calibration and calibration device to replay the inbound signals corresponding to the different pseudo ranges acquired in the step 3.1 to a high-speed oscilloscope and zero-value test software, and measuring and testing pseudo range values of the inbound signals corresponding to the different pseudo ranges replayed by the portable calibration and calibration device;
and 3.3, replaying the inbound signals corresponding to the different pseudo ranges acquired in the step 3.1 to the RDSS user machine test system to be calibrated and calibrated by the portable calibration and calibration device, recording corresponding inbound pseudo range measurement results, comparing the inbound pseudo range measurement results with the pseudo range measurement values obtained in the step 3.2, and obtaining inbound pseudo range measurement value test errors of the test system by solving difference values.
The portable calibration and calibration device consists of a clock generation module, a battery module, a display control module, a 1PPS synchronous acquisition playback control module, a down-conversion radio frequency module, a data acquisition module, a data storage module, a data playback module and an up-conversion radio frequency module, and under the trigger of external 10MHz isogeny and 1PPS rising edge, the portable calibration and calibration device synchronously acquires input radio frequency signals or synchronously plays back and outputs and stores the acquired radio frequency signals;
the clock generation module receives external 10MHz, and divides power into three paths, wherein two paths are respectively provided for the up-conversion radio frequency module and the down-conversion radio frequency module, and the other path is connected with the data acquisition module and the data playback module and is used for generating a data sampling clock and an equipment working clock and respectively providing the data sampling clock for the data acquisition module and the data playback module;
the display control module comprises a display control screen and a key, sets acquisition and playback working parameters, starts/stops acquisition or playback operation, is connected with the 1PPS synchronous acquisition and playback control module, and sends an acquisition instruction or a playback instruction to the 1PPS synchronous acquisition and playback control module after the acquisition or the playback operation is started;
the 1PPS synchronous acquisition playback control module is connected with the data acquisition module and the data playback module, responds to an acquisition instruction or a playback instruction sent by the display control module, and starts the data acquisition module or starts the data playback module to work at the next rising edge moment of the externally input 1 PPS;
the down-conversion radio frequency module is connected with the data acquisition module, filters an externally input radio frequency signal, down-converts the radio frequency signal to an intermediate frequency, and then acquires the intermediate frequency by the data acquisition module; the up-conversion module up-converts the intermediate frequency signal played back by the data playback module to an inbound signal frequency point;
the data acquisition module is connected with the data storage module, comprises an ADC (analog to digital converter), a digital quadrature down-conversion module, a baseband filter and a baseband data stream disk, and is used for converting an intermediate-frequency signal output by the down-conversion module into a digital baseband signal and storing the digital baseband signal in the stream disk;
the data storage module is connected with the data playback module, is a solid state disk and is used for reading and writing control and is used for storing the acquired baseband data as a file;
the data playback module comprises a baseband data reading disc, a digital quadrature up-conversion module and a DAC (digital-to-analog converter), and is used for reading a stored baseband data file and up-converting the baseband data file into an intermediate frequency signal;
the battery module comprises a battery and charge-discharge management and provides a power supply for the portable calibration and calibration device.
The invention has the advantages that the indexes of the first-direction zero value, the EIRP value and the pseudo-range measurement precision can be traced and measured, and the EIRP value and the pseudo-range measurement precision traverse in the index range. And secondly, as a third-party device, the device cannot be questioned by the fairness of a user machine manufacturer. And thirdly, because the portable device is provided with a battery, a touch screen and a key, and can be operated by a single machine, the portable device is very convenient to carry to test systems in different places for comparison.
Drawings
Fig. 1 is a diagram of a bi-directional zero test acquisition inbound signal system.
Fig. 2 is a diagram of a bi-directional zero-test playback inbound signal system.
FIG. 3 is a diagram of an EIRP and inbound pseudorange measurement accuracy calibration system.
Fig. 4 is a composition diagram of the portable calibration and calibration device.
FIG. 5 is a schematic diagram of a bi-directional zero test timing sequence.
Detailed Description
In the following, referring to fig. 1 to 5, to further describe the preferred embodiment of the present invention, the portable calibration and calibration device synchronously acquires the inbound signal of the RDSS client when the RDSS client test system tests the bidirectional zero-value index of the RDSS client; when the EIRP value and the pseudo-range measurement accuracy of the RDSS user machine are tested, different EIRP and different pseudo-range inbound signals simulated by an RDSS inbound analog source are collected and then synchronously played back to the RDSS user machine test system to be calibrated and calibrated respectively, and consistency comparison and calibration between different test systems are realized by comparing whether the test results of the bidirectional zero value, the EIRP value and the pseudo-range measurement accuracy of the RDSS user machine test system to be calibrated and calibrated are in accordance with expectations or not.
The calibration method for the bidirectional zero value comprises the following steps that, assuming that the zero value of the outbound signal of the RDSS user machine test system is calibrated, the extra time delay caused by the portable calibration device collecting and playing back the inbound signal is also calibrated to be zero, which is T2 shown in fig. 5.
Step 1.1, connecting the 1PPS output and the 10MHz output of the test system to a portable calibration and calibration device, dividing the inbound signal of the RDSS subscriber unit into two paths, one path connecting the test system of the RDSS subscriber unit, the other path connecting the portable calibration and calibration device, and the outbound signal output of the test system connecting the signal input end of the RDSS subscriber unit, as shown in FIG. 1;
step 1.2, starting a RDSS user machine test system, selecting a test bidirectional zero-value test item, setting a portable calibration device to start to acquire signals when simulating an RDSS outbound signal to the RDSS user machine, using a 1PPS signal rising edge as a trigger by the portable calibration device, starting to synchronously acquire and store inbound signals of the RDSS user machine at the next 1PPS rising edge moment until the bidirectional zero-value test item is finished, and setting the portable calibration device to finish acquiring the signals; the timing relationship is shown in FIG. 5; and (3) judging whether the bidirectional zero-value index requirement of the RDSS user machine is 1ms +/-10 ns, judging whether the bidirectional zero-value test result of the test system is 1ms +/-10 ns, if so, entering the next step, if not, replacing the RDSS user machine, repeating the step 1.1 until the bidirectional zero-value test result of the test system accords with 1ms +/-10 ns, and calling the collected inbound signals as verified inbound signals.
Step 1.3, disconnecting the connection between the inbound signal of the RDSS subscriber machine and the RDSS subscriber machine test system, connecting the output of the portable calibration and calibration device to the RDSS subscriber machine test system, continuously selecting a test bidirectional zero value test item, setting the portable calibration and calibration device to start replaying the inbound signal acquired in the step 1.1, and synchronously replaying the verified inbound signal by the portable calibration and calibration device at the next rising edge moment of the 1PPS signal until the test item is finished; and comparing whether the two-way zero value test value of the RDSS user machine test system accords with 1ms +/-10 ns, so as to judge whether the extra time delay T2 caused by the acquisition and playback of the inbound signal by the portable calibration and calibration device is calibrated to be zero or not and whether the portable calibration and calibration device works normally or not. If yes, the next step is carried out, if not, the portable calibration device is replaced, the acquisition playback time delay of the portable calibration device is calibrated again, and the steps 1.2 to 1.3 are repeated.
Step 1.4, when calibrating and calibrating the RDSS client test system to be calibrated and calibrated, simultaneously connecting the 1PPS output and the 10MHz output of the RDSS client test system to be calibrated and calibrated to the portable calibration and calibration device, wherein the playback signal output of the portable calibration and calibration device is connected to the inbound signal receiving end of the RDSS client test system to be calibrated and calibrated, and the outbound signal output of the RDSS client test system to be calibrated and calibrated is connected to the signal receiving end of the RDSS client, as shown in fig. 2. The RDSS user machine test system to be calibrated and calibrated selects the same bidirectional zero value test scene, the portable calibration and calibration device is set to begin to play back verified inbound signals, and the portable calibration and calibration device synchronously plays back the stored verified inbound signals to the RDSS user machine test system to be calibrated and calibrated at the next 1PPS rising edge until the test item test is finished; and judging whether the bidirectional zero-value test result of the test system is accurate or not by comparing whether the bidirectional zero-value test result on the RDSS user machine test system to be calibrated is 1ms +/-10 ns or not.
Further, the calibration method for the EIRP value comprises the following steps:
step 2.1, setting simulation inbound signals of simulated inbound signal transmitting power of 10dBm, 0dBm and-10 dBm of an inbound signal simulation source of the RDSS user machine, and respectively collecting the three inbound signals by using a portable calibration and calibration device;
step 2.2, setting the portable calibration and calibration device to replay the three inbound signals acquired in the step 2.1 to a standard power meter and a frequency spectrometer, measuring and testing power values corresponding to the three inbound signals, and recording the three power values;
and 2.3, selecting an inbound EIRP value test item by the RDSS subscriber machine test system to be calibrated and calibrated, setting the portable calibration and calibration device to replay the three inbound signals acquired in the step 2.1 to the RDSS subscriber machine test system to be calibrated and calibrated, recording three EIRP value test results, comparing the three EIRP value test results with the three power values in the step 2.2 one by one, and obtaining an EIRP value test error of the test system by calculating a difference value.
Further, the calibration and calibration method for the pseudorange measurement accuracy comprises the following steps:
step 3.1, setting an RDSS inbound signal analog source to respectively simulate simulated inbound signals of 0m, 0.03m and 100m pseudo ranges, and respectively collecting the three inbound signals by using a portable calibration and calibration device;
step 3.2, the playback signal output of the portable calibration and calibration device is connected to a high-speed oscilloscope, the portable calibration and calibration device is set to play back the three inbound signals acquired in the step 3.1, and pseudo range values corresponding to the three inbound signals are measured and tested by the high-speed oscilloscope and zero value test software;
and 3.3, replaying the three inbound signals acquired in the step 3.1 to the RDSS user machine test system to be calibrated and calibrated by the portable calibration and calibration device, recording three inbound pseudo-range measurement results corresponding to the test system, comparing the three inbound pseudo-range measurement results with the three pseudo-range measurement values obtained in the metering test in the step 3.2 one by one, and obtaining the inbound pseudo-range measurement value test error of the test system by calculating a difference value.
The portable calibration and calibration device consists of a clock generation module, a battery module, a display control module, a 1PPS synchronous acquisition playback control module, a down-conversion radio frequency module, a data acquisition module, a data storage module, a data playback module and an up-conversion radio frequency module, and under the trigger of external 10MHz isogeny and 1PPS rising edge, the portable calibration and calibration device synchronously acquires input radio frequency signals or synchronously plays back and outputs and stores the acquired radio frequency signals;
the clock generation module receives external 10MHz, and divides power into three paths, wherein two paths are respectively provided for the up-conversion radio frequency module and the down-conversion radio frequency module, and the other path is connected with the data acquisition module and the data playback module and is used for generating a data sampling clock and an equipment working clock and respectively providing the data sampling clock for the data acquisition module and the data playback module;
the display control module comprises a display control screen and a key, sets acquisition and playback working parameters, starts/stops acquisition or playback operation, is connected with the 1PPS synchronous acquisition and playback control module, and sends an acquisition instruction or a playback instruction to the 1PPS synchronous acquisition and playback control module after the acquisition or the playback operation is started;
the 1PPS synchronous acquisition playback control module is connected with the data acquisition module and the data playback module, responds to an acquisition instruction or a playback instruction sent by the display control module, and starts the data acquisition module or starts the data playback module to work at the next rising edge moment of the externally input 1 PPS;
the down-conversion radio frequency module is connected with the data acquisition module, filters an externally input radio frequency signal, down-converts the radio frequency signal to an intermediate frequency, and then acquires the intermediate frequency by the data acquisition module; the up-conversion module up-converts the intermediate frequency signal played back by the data playback module to an inbound signal frequency point;
the data acquisition module is connected with the data storage module, comprises an ADC (analog to digital converter), a digital quadrature down-conversion module, a baseband filter and a baseband data stream disk, and is used for converting an intermediate-frequency signal output by the down-conversion module into a digital baseband signal and storing the digital baseband signal in the stream disk;
the data storage module is connected with the data playback module, is a solid state disk and is used for reading and writing control and is used for storing the acquired baseband data as a file;
the data playback module comprises a baseband data reading disc, a digital quadrature up-conversion module and a DAC (digital-to-analog converter), and is used for reading a stored baseband data file and up-converting the baseband data file into an intermediate frequency signal;
the battery module comprises a battery and charge-discharge management and provides a power supply for the portable calibration and calibration device.
Claims (6)
1. A calibration method for a RDSS user machine test system is characterized by comprising the following steps: the portable calibration and calibration device synchronously acquires inbound signals of the RDSS user machine when the RDSS user machine test system tests the bidirectional zero-value index of the RDSS user machine; when the EIRP value and the pseudo-range measurement accuracy of the RDSS user machine are tested, different EIRPs and different pseudo-range inbound signals simulated by an RDSS inbound analog source are collected, then the collected inbound signals are synchronously played back to the RDSS user machine test system to be calibrated and calibrated respectively, and consistency comparison and calibration among different test systems are realized by comparing whether the bidirectional zero value, the EIRP value and the pseudo-range measurement accuracy test result of the RDSS user machine test system to be calibrated and calibrated are in accordance with expectations or not.
2. The calibration method for the RDSS client test system according to claim 1, wherein,
the 1PPS output of the RDSS test system is connected to a portable calibration device, the portable calibration device adopts the rising edge of a 1PPS signal as a trigger signal to synchronously acquire an inbound signal of the RDSS user machine, the time delay relation between the inbound signal and 1PPS is synchronously acquired and synchronously played back to the RDSS user machine test system to be calibrated and calibrated, the extra time delay caused by the acquisition and playback of the portable calibration device is calibrated to be zero in advance through a high-speed oscilloscope and a zero value calibration method, and a bidirectional zero value index is completely restored.
3. The calibration method for the RDSS client test system according to claim 1, wherein,
the calibration and calibration method for the bidirectional zero value comprises the following steps:
step 1.1, connecting the 1PPS output and the 10MHz output of the RDSS user machine test system to a portable calibration device, dividing the inbound signal of the RDSS user machine into two paths, one path is connected with the RDSS user machine test system, the other path is connected with the portable calibration device, and the outbound signal output of the RDSS user machine test system is connected with the signal input end of the RDSS user machine;
step 1.2, starting a RDSS user machine test system, selecting a test bidirectional zero-value test item, setting a portable calibration device to start to acquire signals when simulating an RDSS outbound signal to the RDSS user machine, using a 1PPS signal rising edge as a trigger by the portable calibration device, starting to synchronously acquire and store inbound signals of the RDSS user machine at the next 1PPS rising edge moment until the bidirectional zero-value test item is finished, and setting the portable calibration device to finish acquiring the signals; judging whether the bidirectional zero-value test result of the RDSS user machine test system meets the index requirement, if so, entering the next step, if not, replacing the RDSS user machine, and repeating the step 1.1 until the bidirectional zero-value test result of the RDSS user machine test system meets the index requirement, wherein the acquired inbound signal is called as a verified inbound signal;
step 1.3, disconnecting the connection between the inbound signal of the RDSS subscriber machine and the RDSS subscriber machine test system, connecting the output of the portable calibration and calibration device to the RDSS subscriber machine test system, continuously selecting a test bidirectional zero value test item, setting the portable calibration and calibration device to start replaying the inbound signal acquired in the step 1.1, and synchronously replaying the verified inbound signal by the portable calibration and calibration device at the next rising edge moment of the 1PPS signal until the test item is finished; comparing whether the two-way zero value test value of the RDSS user machine test system meets the index requirement, and judging whether the extra time delay T2 caused by the acquisition and playback of the inbound signal by the portable calibration and calibration device is calibrated to be zero or not and whether the portable calibration and calibration device works normally or not; if yes, the next step is carried out, if not, the portable calibration and calibration device is replaced, the acquisition playback time delay of the portable calibration and calibration device is calibrated again, and the steps 1.2 to 1.3 are repeated;
step 1.4, when calibrating and calibrating the RDSS client test system to be calibrated and calibrated, simultaneously connecting 1PPS output and 10MHz of the RDSS client test system to be calibrated and calibrated to a portable calibration device, connecting the output of the portable calibration device to the RDSS client test system to be calibrated and calibrated, connecting the outbound signal output of the RDSS client test system to be calibrated and calibrated to a signal receiving end of the RDSS client, selecting to run the same bidirectional zero-value test scene, setting the portable calibration device to start playback of verified inbound signals, and synchronously playing back the stored verified inbound signals to the RDSS client test system to be calibrated and calibrated by the portable calibration device at the next rising edge of 1PPS until the test item is finished; and judging whether the bidirectional zero-value test result of the test system is accurate or not by comparing whether the test result of the bidirectional zero-value on the RDSS user machine test system to be calibrated meets the index requirement or not.
4. The calibration method for the RDSS client test system according to claim 1, wherein,
the calibration and calibration method of the EIRP value comprises the following steps:
step 2.1, setting an inbound signal analog source of the RDSS user machine to simulate inbound signals with different EIRP transmitting powers, and respectively collecting the inbound signals corresponding to the different EIRPs by using a portable calibration and calibration device;
step 2.2, setting the portable calibration and calibration device to replay the inbound signals corresponding to the different EIRPs acquired in the step 2.1 to a standard power meter and a frequency spectrometer, and measuring and testing power values of the inbound signals corresponding to the different EIRPs;
and 2.3, running an inbound EIRP value test item by the RDSS user machine test system to be calibrated and calibrated, replaying the inbound signals corresponding to different EIRPs acquired in the step 2.1 to the RDSS user machine test system to be calibrated and calibrated by the portable calibration device, recording each EIRP value test result, comparing the EIRP value test result with the power value in the step 2.2, and obtaining an EIRP value test error of the test system by calculating a difference value.
5. The calibration method for the RDSS client test system according to claim 1, wherein,
the calibration and calibration method of the pseudo-range measurement precision comprises the following steps:
step 3.1, setting an inbound signal analog source of the RDSS user machine to simulate inbound signals of different pseudo ranges, and respectively acquiring the inbound signals corresponding to the different pseudo ranges by using a portable calibration device;
step 3.2, setting the portable calibration and calibration device to replay the inbound signals corresponding to the different pseudo ranges acquired in the step 3.1 to a high-speed oscilloscope and zero-value test software, and measuring and testing pseudo range values of the inbound signals corresponding to the different pseudo ranges;
and 3.3, replaying the inbound signals corresponding to the different pseudo ranges acquired in the step 3.1 to the RDSS user machine test system to be calibrated and calibrated by the portable calibration and calibration device, recording corresponding inbound pseudo range measurement results, comparing the inbound pseudo range measurement results with the pseudo range measurement values obtained in the step 3.2, and obtaining inbound pseudo range measurement value test errors of the test system by solving difference values.
6. An apparatus for calibration of an RDSS client test system according to claim 1,
the portable calibration and calibration device consists of a clock generation module, a battery module, a display control module, a 1PPS synchronous acquisition playback control module, a down-conversion radio frequency module, a data acquisition module, a data storage module, a data playback module and an up-conversion radio frequency module, and under the trigger of external 10MHz isogeny and 1PPS rising edge, the portable calibration and calibration device synchronously acquires input radio frequency signals or synchronously plays back and outputs and stores the acquired radio frequency signals;
the clock generation module receives external 10MHz, and divides power into three paths, wherein two paths are respectively provided for the up-conversion radio frequency module and the down-conversion radio frequency module, and the other path is connected with the data acquisition module and the data playback module and is used for generating a data sampling clock and an equipment working clock and respectively providing the data sampling clock for the data acquisition module and the data playback module;
the display control module comprises a display control screen and a key, is used for setting acquisition and playback working parameters and starting/stopping acquisition or playback operation, is connected with the 1PPS synchronous acquisition and playback control module, and sends an acquisition instruction or a playback instruction to the 1PPS synchronous acquisition and playback control module after the acquisition or the playback operation is started;
the 1PPS synchronous acquisition playback control module is connected with the data acquisition module and the data playback module, responds to an acquisition instruction or a playback instruction sent by the display control module, and starts the data acquisition module or starts the data playback module to work at the next rising edge moment of the externally input 1 PPS;
the down-conversion radio frequency module is connected with the data acquisition module, filters an externally input radio frequency signal, down-converts the radio frequency signal to an intermediate frequency, and then acquires the intermediate frequency by the data acquisition module; the up-conversion module up-converts the intermediate frequency signal played back by the data playback module to an inbound signal frequency point;
the data acquisition module is connected with the data storage module, comprises an ADC (analog to digital converter), a digital quadrature down-conversion module, a baseband filter and a baseband data stream disk, and is used for converting an intermediate-frequency signal output by the down-conversion module into a digital baseband signal and storing the digital baseband signal in the stream disk;
the data storage module is connected with the data playback module, is a solid state disk and is used for reading and writing control and is used for storing the acquired baseband data as a file;
the data playback module comprises a baseband data reading disc, a digital quadrature up-conversion module and a DAC (digital-to-analog converter), and is used for reading a stored baseband data file and up-converting the baseband data file into an intermediate frequency signal;
the battery module comprises a battery and charge-discharge management and provides a power supply for the portable calibration and calibration device.
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