CN115479613A - Navigation terminal detector self-calibration system, self-calibration method and traceability system - Google Patents
Navigation terminal detector self-calibration system, self-calibration method and traceability system Download PDFInfo
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- CN115479613A CN115479613A CN202110604911.5A CN202110604911A CN115479613A CN 115479613 A CN115479613 A CN 115479613A CN 202110604911 A CN202110604911 A CN 202110604911A CN 115479613 A CN115479613 A CN 115479613A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
Abstract
The application relates to the technical field of instrument calibration, and discloses a navigation terminal detector self calibration system, including: the system comprises a navigation signal generation module, a radio frequency switch, a detection module and a calibration module which are sequentially connected, wherein the navigation signal generation module is used for generating a navigation signal and sending the navigation signal to the detection module through the radio frequency switch; the detection module comprises a power detection module and a time delay detection module, the power detection module and the time delay detection module are respectively connected with the calibration module, and the radio frequency switch is used for switching a navigation signal to be sent to the power detection module or the time delay detection module; the calibration module is also connected with the navigation signal generation module and used for generating a power calibration value or a time delay calibration value of the navigation signal and sending the power calibration value or the time delay calibration value to the navigation signal generation module; the system can meet the requirements of modern equipment for rapid detection before war, metering, daily maintenance and calibration and the like, and the application also discloses a self-calibration method and a traceability system of the navigation terminal detector.
Description
Technical Field
The application relates to the technical field of instrument calibration, in particular to a self-calibration system, a self-calibration method and a traceability system of a navigation detector.
Background
At present, the navigation terminal detection instrument calibration usually performs traceability calibration to a superior measurement unit, and measures and compares the equipment index precision by means of a general instrument and the like. The indexes such as power and time delay are usually measured by using instruments such as a power meter, a frequency spectrograph, an oscilloscope and the like.
At present, the unit for calibrating the navigation terminal detection instrument is generally a national measurement mechanism at each level, and a professional is required to operate the calibration instrument, the calibration traceability method is difficult to achieve, the period is long, the purposes of quick traceability and calibration are difficult to achieve, and particularly, equipment is used at a base level, so that the problems of effective calibration and traceability are difficult to obtain due to the fact that the measurement detection instrument is high in use and maintenance speciality, difficult to construct and the like.
Content of application
The embodiment of the application provides a self-calibration system, a self-calibration method and a traceability system of a navigation detector, which are used for solving the problems of great difficulty and long period in the calibration and traceability of the navigation terminal detector in the prior art.
One aspect of the present application provides a self-calibration system of a navigation terminal detector, including:
the device comprises a navigation signal generation module, a radio frequency switch, a detection module and a calibration module which are sequentially connected, wherein the navigation signal generation module is used for generating a navigation signal and sending the navigation signal to the detection module through the radio frequency switch;
the detection module comprises a power detection module and a time delay detection module, the power detection module and the time delay detection module are respectively connected with the calibration module, and the radio frequency switch is used for switching the navigation signal to be sent to the power detection module or the time delay detection module;
the calibration module is also connected with the navigation signal generation module and used for generating a power calibration value or a time delay calibration value of the navigation signal and sending the power calibration value or the time delay calibration value to the navigation signal generation module;
furthermore, the power detection module comprises a high-pass filtering unit, a radio frequency power detection unit and a signal conversion unit which are connected in sequence;
further, a high-pass filtering unit is used for filtering the navigation signal, the radio frequency power detection unit is used for performing power detection on the filtered navigation signal, and the signal conversion unit comprises an analog-to-digital converter and a microcontroller;
further, the delay detection module includes an inbound receiver, and the inbound receiver is configured to measure a delay of the navigation signal to obtain a delay measurement value;
further, the power detection module is configured to detect the power of the navigation signal to obtain a power measurement value;
further, the calibration module is configured to generate a power calibration value and a time delay calibration value of the navigation signal according to the power measurement value or the time delay measurement value, respectively, and send the power calibration value and the time delay calibration value to the navigation signal generation module;
another aspect of the present application provides a self-calibration method for a navigation terminal detector, including the steps of: the navigation signal generating module generates a navigation signal and sends the navigation signal to the detection module through the matrix switch;
the detection module detects the time delay or the power of the navigation signal and obtains a time delay measurement value or a power measurement value;
and the calibration module generates a power calibration value or a time delay calibration value of the navigation signal according to the time delay measurement value or the power measurement value and sends the power calibration value or the time delay calibration value to the navigation signal generation module.
Further, the detection module comprises a power detection module and a time delay detection module, and the radio frequency switch is used for switching the navigation signal to be sent to the power detection module or the time delay detection module; the calibration module obtains the power calibration value according to the power measurement value and a power standard value, and the detection module also obtains the time delay calibration value according to the time delay measurement value and a time delay standard value;
further, the power detection module includes a high-pass filtering unit that high-pass filters the navigation signal.
In another aspect, the present application further provides a system for tracing a source of a detector of a navigation terminal, including: two above-mentioned navigation terminal detector self calibration systems of arbitrary: the output port of a navigation signal generation module of the basic layer self-calibration system is connected with a power metering input interface of the superior self-calibration system through a standard cable; the output port of the signal generation module of the upper self-calibration system is connected with the inbound receiver of the basic self-calibration system; the upper-level self-calibration system is connected with the calibration module of the base layer self-calibration system through a radio frequency cable.
The self-calibration system and the self-calibration method for the navigation terminal detector comprise the detection module and the calibration module, so that the self-calibration of power and time delay can be quickly carried out on the navigation terminal detector, the calibration cost and difficulty are reduced, and the calibration efficiency is improved; according to the source tracing system of the navigation terminal detector, the basic level self-calibration system is connected with the upper level self-calibration system, and the basic level self-calibration system can quickly trace time delay and power to the upper level self-calibration system. Compared with the existing calibration tracing method, the method can meet the requirements of modern equipment on rapid detection, metering, routine maintenance and calibration before war, and the self-calibration and tracing precision can meet the requirements of the current metering standard.
Drawings
Fig. 1 is a block diagram of a self-calibration system of a navigation terminal detector according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a self-calibration method of a navigation terminal detector according to an embodiment of the present disclosure;
fig. 3 is a block diagram of a source tracing system of a navigation terminal detector according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application shall fall within the scope of protection of the present application.
The present application will now be described in further detail with reference to the drawings and detailed description.
Referring to fig. 1, fig. 1 is a block diagram of a self-calibration system of a navigation terminal detector according to an embodiment of the present disclosure, which includes a navigation signal generation module, a radio frequency switch, a detection module, and a calibration module, which are connected in sequence. The navigation signal generation module is used for generating navigation signals, wherein the navigation signals comprise satellite navigation signals with different frequency points, such as frequency point signals of BDS B1, GPS L1, GLONASS L1 and the like, and are sent to the detection module through the radio frequency switch. Further, a power delay metering input port (not shown) is further included between the radio frequency switch and the navigation signal generating module. Furthermore, the detection module comprises a power detection module and a time delay detection module, one end of the power detection module and one end of the time delay detection module are respectively connected with a radio frequency switch, and the radio frequency switch is used for switching the navigation signal and controlling the navigation signal to be sent to the power detection module or the time delay detection module. The other ends of the power detection module and the time delay detection module are respectively connected with a calibration module, and the calibration module is also connected with the navigation signal generation module and used for generating a power calibration value or a time delay calibration value of the navigation signal and sending the power calibration value or the time delay calibration value to the navigation signal generation module.
In a specific embodiment, the power detection module includes a high-pass filtering unit, a radio frequency power detection unit, and a signal conversion unit, which are connected in sequence. The high-pass filtering unit is used for filtering the navigation signal so as to remove low-frequency interference in the navigation signal. The radio frequency power detection Unit is used for detecting the power of the navigation signal after filtering, and the signal conversion Unit comprises an Analog/Digital converter (ADC) and a Microcontroller (MCU). The time delay detection module comprises an inbound receiver, the signal input end of the inbound receiver is connected with the output end of the navigation signal generation module, and the inbound receiver measures the time delay of the radio frequency signal to obtain a corresponding time delay measured value.
The calibration module is used for generating a power calibration value and a time delay calibration value of the navigation signal and sending the power calibration value and the time delay calibration value to the navigation signal generation module. Specifically, when the navigation signal is sent to the power detection module through the matrix switch, the calibration module compares the power measurement value with the power standard value, the power standard value and the time delay standard value are preset when the equipment leaves a factory, and are generally obtained through measurement of a general instrument, and judges whether the power measurement result meets the requirement, if the error of the judgment result is smaller than or equal to 1dB, if the power measurement result does not meet the requirement, the power calibration value is calculated, and the power calibration value is sent to the navigation signal generation module. The power detection module adopts the technologies of temperature compensation and the like, has higher power stability, and has the precision superior to 0.4dB under the normal calibration working environment (the temperature is 15-35 ℃), so the power detection module is used as the power reference standard of the self-calibration system. In the power detection mode, a navigation signal is sent to a power calibration module through a radio frequency switch, high-pass filtering is firstly carried out, a high-pass filtering unit carries out filtering on stray interference which is easy to generate, such as an FPGA (field programmable gate array) and a clock circuit, the power detection module is used for carrying out logarithmic detection measurement on an input signal power RMS (root mean square) value, the linear dynamic range of the measurement is-50 dBm-0 dBm, under the condition of comparative measurement, the measurement error is within +/-0.2 dB, the slope of the output power indication level is 50mV/dB, 12-bit ADC is sent to be adopted and then sent to the calibration module for processing, and the measurement uncertainty brought by the power calibration module is superior to 0.3dB in consideration of ADC sampling error.
Similarly, when the navigation signal is sent to the delay detection module through the matrix switch, the calibration module compares the delay measurement value with the delay standard value, judges whether the delay measurement result meets the requirement, if the error of the judgment result is less than 5ns, calculates the delay calibration value if the delay measurement result does not meet the requirement, and sends the delay calibration value to the navigation signal generation module. The time delay calibration utilizes an RDSS inbound receiver to measure the time delay of the RDSS, after the RDSS inbound receiver enters a calibration mode, an RDSS outbound signal of the equipment is changed into an RDSS standard inbound signal which is a RDSS uplink signal with controllable power and time delay, and the measurement precision is determined by the measurement precision of the inbound receiver and is generally better than 1ns.
Referring to fig. 2, fig. 2 is a flowchart of a self-calibration method of a navigation terminal detector according to an embodiment of the present application, where the method is used for the self-calibration system of the navigation terminal detector, and the method includes the steps of:
s1, a navigation signal generating module generates a navigation signal and sends the navigation signal to a detecting module through a matrix switch;
s2, a detection module detects the time delay or the power of the navigation signal and obtains a time delay measured value or a power measured value;
and S3, the calibration module generates a power calibration value or a time delay calibration value of the navigation signal according to the time delay measurement value or the power measurement value and sends the power calibration value or the time delay calibration value to the navigation signal generation module.
In a specific embodiment, the detection module includes a power detection module and a delay detection module, and the radio frequency switch is configured to switch the navigation signal to be sent to the power detection module or the delay detection module; the calibration module obtains the power calibration value according to the power measurement value and the power standard value, and the detection module also obtains the time delay calibration value according to the time delay measurement value and the time delay standard value.
Specifically, the power detection module includes a high-pass filtering unit for performing high-pass filtering on the navigation signal, and a radio frequency power detection unit for performing power detection on the filtered navigation signal. The specific self-calibration method is the same as the self-calibration system, and is not described herein again.
Referring to fig. 3, fig. 3 is a block diagram of a source tracing system of a navigation terminal detector provided in an embodiment of the present application, including a base layer self-calibration system and a superior self-calibration system, which have the same structures as the self-calibration system of the navigation terminal detector, where a power and delay precision value of the superior self-calibration system is higher than that of the base layer self-calibration system, and an output port of a navigation signal generation module of the base layer self-calibration system is connected to a power metering input interface of the superior self-calibration system through a standard cable; the output port of the signal generation module of the upper self-calibration system is connected with the inbound receiver of the basic self-calibration system; the upper-level self-calibration system is connected with the calibration module of the base layer self-calibration system through a radio frequency cable.
When the system carries out power tracing, the basic self-calibration system outputs a measured navigation signal to the upper-level self-calibration system through a standard cable, according to the homologous technology, the basic self-calibration system and the upper-level self-calibration system use the same clock source, the upper-level self-calibration system adopts the same power detection principle as the basic self-calibration system, and meanwhile, the upper-level self-calibration system can calibrate a general instrument to improve the power detection accuracy, and according to the power calibration principle, the power calibration uncertainty is superior to 0.7dB.
When the system performs RDSS (remote desktop system) delay tracing, the upper-level self-calibration system outputs a standard inbound signal to the basic-level self-calibration system, the inbound receiver of the basic-level self-calibration system measures the delay, and meanwhile according to the homologous technology, the two devices use the same clock source, and the delay measurement precision of the inbound receiver is superior to 1ns.
The self-calibration system and the self-calibration method for the navigation terminal detector comprise the detection module and the calibration module, so that the self-calibration of power and time delay can be quickly carried out on the navigation terminal detector, the calibration cost and difficulty are reduced, and the calibration efficiency is improved; according to the source tracing system of the navigation terminal detector, the basic level self-calibration system is connected with the upper level self-calibration system, and the basic level self-calibration system can quickly trace the source of time delay and power to the upper level self-calibration system. Compared with the existing calibration tracing method, the method can meet the requirements of modern equipment on pre-war quick detection, metering, daily maintenance and calibration and the like, and meanwhile, the self-calibration and tracing precision can meet the requirements of the current metering standard.
Although the present application has been described with reference to preferred embodiments, it is not intended to limit the present application. Those skilled in the art can make numerous possible variations and modifications to the disclosed solution, or modify equivalent embodiments to equivalent variations, without departing from the scope of the solution, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present application shall fall within the protection scope of the technical solution of the present application, unless it departs from the content of the technical solution of the present application.
Claims (10)
1. A self-calibration system of a navigation terminal detector is characterized by comprising:
the device comprises a navigation signal generation module, a radio frequency switch, a detection module and a calibration module which are sequentially connected, wherein the navigation signal generation module is used for generating a navigation signal and sending the navigation signal to the detection module through the radio frequency switch;
the detection module comprises a power detection module and a time delay detection module, the power detection module and the time delay detection module are respectively connected with the calibration module, and the radio frequency switch is used for switching the navigation signal to be sent to the power detection module or the time delay detection module;
the calibration module is further connected with the navigation signal generation module and used for generating a power calibration value or a time delay calibration value of the navigation signal and sending the power calibration value or the time delay calibration value to the navigation signal generation module.
2. The self-calibration system of claim 1, wherein the power detection module comprises a high-pass filtering unit, a radio frequency power detection unit and a signal conversion unit, which are connected in sequence.
3. The self-calibration system of claim 2, wherein the high-pass filtering unit is configured to filter the navigation signal, the radio frequency power detection unit is configured to detect power of the filtered navigation signal, and the signal conversion unit comprises an analog-to-digital converter and a microcontroller.
4. The self-calibration system of claim 1, wherein the delay detection module comprises an inbound receiver, and the inbound receiver is configured to measure the delay of the navigation signal to obtain a delay measurement value.
5. The self-calibration system of claim 3, wherein the power detection module is configured to detect the power of the navigation signal to obtain a power measurement.
6. The self-calibration system of the navigation terminal detector according to claim 4 or 5, wherein the calibration module is configured to generate a power calibration value or a delay calibration value of the navigation signal according to the power measurement value or the delay measurement value, respectively, and send the power calibration value or the delay calibration value to the navigation signal generation module.
7. A self-calibration method of a navigation terminal detector is characterized by comprising the following steps:
the navigation signal generation module generates a navigation signal and sends the navigation signal to the detection module through the matrix switch;
the detection module detects the time delay or the power of the navigation signal and obtains a time delay measurement value or a power measurement value;
and the calibration module generates a power calibration value or a time delay calibration value of the navigation signal according to the time delay measurement value or the power measurement value and sends the power calibration value or the time delay calibration value to the navigation signal generation module.
8. The self-calibration method of the navigation terminal detector according to claim 7, wherein the detection module comprises a power detection module and a delay detection module, and the radio frequency switch is used for switching the navigation signal to be sent to the power detection module or the delay detection module;
the calibration module obtains the power calibration value according to the power measurement value and a power standard value, and the detection module also obtains the time delay calibration value according to the time delay measurement value and a time delay standard value.
9. The method of claim 7, wherein the power detection module comprises a high-pass filtering unit for high-pass filtering the navigation signal.
10. A navigation terminal detector traceability system, comprising two navigation terminal detector self-calibration systems as claimed in any one of claims 1 to 6: the output port of a navigation signal generation module of the basic layer self-calibration system is connected with a power metering input interface of the superior self-calibration system through a standard cable; the output port of the signal generation module of the upper self-calibration system is connected with the inbound receiver of the basic self-calibration system; the upper-level self-calibration system is connected with the calibration module of the base layer self-calibration system through a radio frequency cable.
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