CN115421108A - Dynamic automatic testing method for satellite-borne phased array meteorological radar - Google Patents
Dynamic automatic testing method for satellite-borne phased array meteorological radar Download PDFInfo
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Abstract
The invention provides a dynamic automatic testing method for a satellite-borne phased array meteorological radar. The invention simulates the change of the attitude of the radar at the rail position, generates a simulated echo signal in real time, realizes dynamic test, and solves the problems of different actual working states and incomplete coverage of the conventional radar static test; according to the characteristic that the gain of an antenna changes relative to a certain fixed direction during radar beam scanning, an echo simulator is used for receiving a transmitting signal, the measurement and the inspection of the beam scanning polarity, the wave position residence time and the beam stepping amount of the phased array antenna are realized by analyzing the simulated echo intensity received by the radar and the signal intensity change characteristic received by the simulator, the beam dynamic scanning characteristic of the radar in the long-time working process can be comprehensively tested and inspected, and the problem that the beam scanning polarity, the wave position residence time and the beam stepping amount of the phased array radar are difficult to dynamically test is solved.
Description
Technical Field
The invention relates to the technical field of measurement and testing, in particular to a dynamic automatic testing method for a satellite-borne phased array meteorological radar.
Background
The satellite-borne meteorological radar is an active microwave remote sensing instrument for accurately and quantitatively measuring meteorological elements such as cloud, rainfall and the like, and the instrument is required to work stably and reliably in an on-orbit mode for a long time. Improving the radar test coverage and increasing the test strength is an effective means for ground inspection of the reliability of the working stability of the radar. However, the radar has the following difficulties in the test process:
1) The quantity of single machines in the radar is large, a cross backup mode is adopted, a large number of combination modes exist, and the working state of the radar is large;
2) The radar has multiple working modes, and the radar has multiple working modes in the same working state;
3) During working, working parameters such as radar Pulse Repetition Frequency (PRF) and echo sampling windows are dynamically adjusted according to the current satellite platform longitude and latitude position, attitude and radar beam scanning angle of the radar, so that the radar has dynamic testing capability;
4) The radar adopts an antenna beam electrical scanning mode, and whether the dynamic scanning characteristics such as scanning polarity, wave position residence time and the like of the antenna beam are normal or not is difficult to judge;
5) In order to test the stability of radar products, the radar needs to be tested for a long time, the testing strength is high, massive testing data are generated, and the data analysis workload is huge.
Therefore, a dynamic test and detection method for automatically testing the radar in the in-orbit working process needs to be researched, so that the radar can be comprehensively and efficiently tested automatically.
Disclosure of Invention
The invention aims to solve the problem of radar on-orbit testing, and provides a dynamic automatic testing method for a satellite-borne phased array meteorological radar, which can realize full-automatic dynamic testing on functions, performance, processes and the like of the satellite-borne phased array radar, compare and analyze mass data measured for a long time, judge whether the radar works stably and reliably, and find the accidental problem of equipment in time.
The invention provides a dynamic automatic testing method for a satellite-borne phased array meteorological radar, which is characterized by comprising the following steps of: the method comprises the following steps:
s1, constructing a test system: the method comprises the steps that a testing system is constructed according to the working characteristics of the to-be-tested satellite-borne phased array meteorological radar, the testing system comprises a satellite interface simulator and an echo simulator, the satellite interface simulator is electrically connected with the to-be-tested satellite-borne phased array meteorological radar, the satellite interface simulator is used for simulating an electrical interface of a satellite platform and the to-be-tested satellite-borne phased array meteorological radar, providing interface service for the to-be-tested satellite-borne phased array meteorological radar, receiving output data of the echo simulator and judging the state of the to-be-tested satellite-borne phased array meteorological radar, and the echo simulator is used for receiving radio-frequency signals, measuring radio-frequency signals, modulating echo signals and outputting the echo signals to the to-be-tested satellite-borne phased array meteorological radar;
s2, presetting parameters: setting a test task table, a parameter table and a judgment table of the test system, then carrying out self-test on the test system and judging whether the state of the test system is normal or not, and if so, entering the step S3; if the abnormal situation exists, positioning the problem and processing the problem, and then entering the step S3;
s3, automatic testing: the satellite interface simulator issues a working instruction to the to-be-tested satellite-borne phased array meteorological radar according to the simulation of the test task table, the to-be-tested satellite-borne phased array meteorological radar works according to the working instruction, and the satellite interface simulator detects working mode data of the to-be-tested satellite-borne phased array meteorological radar; the satellite-borne phased array meteorological radar to be tested performs wave beam scanning according to a working instruction and outputs radio frequency signals, the echo simulator receives the radio frequency signals and measures signal characteristic parameters and outputs the signal characteristic parameters to the satellite interface simulator, the echo simulator modulates the received radio frequency signals into echo signals and forwards the echo signals to the satellite-borne phased array meteorological radar to be tested in a delayed mode, the satellite-borne phased array meteorological radar to be tested receives the echo signals and processes the echo signals to obtain remote sensing data and then feeds the remote sensing data back to the satellite interface simulator, the satellite interface simulator judges whether the satellite-borne phased array meteorological radar to be tested is normal or not according to working mode data, signal characteristics and the remote sensing data and outputs a testing result, and dynamic automatic testing of the satellite-borne phased array meteorological radar is completed.
The invention relates to a dynamic automatic testing method for a satellite-borne phased array meteorological radar, which is used as a preferred mode, and the step S3 comprises the following steps:
s31, issuing a working instruction: the satellite interface simulator provides interface service for the satellite-borne phased array meteorological radar to be tested, and then sends a working instruction to the satellite-borne phased array meteorological radar to be tested according to the simulation of a test task table, wherein the interface service comprises power supply providing, control, communication, remote sensing data receiving and analog quantity acquisition;
s32, the radar enters a working state: the satellite-borne phased array meteorological radar to be tested performs wave beam scanning according to the working instruction, selects pulse repetition frequency according to the position and the posture of the satellite platform and the wave beam scanning angle, and outputs radio frequency signals according to the start-stop time of an echo sampling window, and the satellite interface simulator detects and measures parameters of the satellite-borne phased array meteorological radar to be tested in a corresponding working mode;
s33, receiving radio frequency signals: the echo simulator receives the radio frequency signal and measures the signal characteristic parameter and exports to the satellite interface simulator, and the signal characteristic parameter includes: amplitude, pulse width, arrival time and frequency;
s34, echo signal delay forwarding: the echo simulator modulates the received radio frequency signal into an echo signal and forwards the echo signal to the spaceborne phased array meteorological radar to be tested in a delayed manner;
s35, remote sensing data generation and output: the satellite-borne phased array meteorological radar to be tested receives echo signals, processes the echo signals, stamps a timestamp and frames the echo signals to obtain remote sensing data, and feeds the remote sensing data back to the satellite interface simulator through a remote sensing data channel;
s36, judging the working state: and the satellite interface simulator judges whether the satellite-borne phased array meteorological radar to be tested is normal or not by using a decision table according to the working mode data, the signal characteristics and the remote sensing data and outputs a test result, so that the dynamic automatic test of the satellite-borne phased array meteorological radar is completed.
The invention relates to a dynamic automatic testing method of a satellite-borne phased array meteorological radar, which is used as an optimal selection mode, in the step S1, a satellite interface simulator (1) is used for simulating a power interface, an instruction interface, a 1553B bus interface, a remote sensing data transmission interface and a simulation telemetering amount interface between a satellite platform and the satellite-borne phased array meteorological radar to be tested; the power interface is used for supplying power to the satellite-borne phased array meteorological radar to be tested, and the instruction interface is used for providing a startup and shutdown instruction for the satellite-borne phased array meteorological radar to be tested; the 1553 interface is used for outputting instructions, state parameter information and receiving digital information, and the digital information comprises instruction responses and digital telemetering; the remote sensing data transmission interface is used for receiving remote sensing data output by the satellite-borne phased array meteorological radar to be tested; the simulation telemetering interface is used for simulating a satellite platform to acquire radar simulation telemetering, and the simulation telemetering comprises temperature and power supply voltage;
in step S2, the test task list comprises whether the internal single machine of the satellite-borne phased array meteorological radar to be tested works as a host machine or a standby machine, the radar working mode switching sequence and the working time of each mode.
The invention relates to a dynamic automatic testing method of a satellite-borne phased array meteorological radar, which is an optimal mode, in the step S2, a parameter table comprises satellite orbit parameters to be simulated and precipitation target parameters to be simulated, the satellite orbit parameters to be simulated comprise platform position information and attitude information, and the precipitation target parameters to be simulated comprise precipitation intensity, precipitation height and precipitation layer number.
The invention relates to a dynamic automatic testing method of a satellite-borne phased array meteorological radar, which is used as an optimal mode, and in the step S2, whether the state of a radar system to be tested is normal or not is judged according to a judgment table.
As an optimal mode, in the step S32, the working mode data comprise digital telemeasurement, remote sensing data and analog telemeasurement of temperature and voltage of each single machine of the radar.
As an optimal mode, in step S33, signal characteristics comprise radar pulse width, center frequency, pulse repetition interval, wave position residence time and the number of pulses transmitted in wave positions.
The invention relates to a dynamic automatic testing method of a satellite-borne phased array meteorological radar, which is an optimal mode, and in the step S34, the generation mode of an echo signal is as follows: the echo simulator calculates the satellite-ground distance according to the position output by the satellite interface simulator, then calculates the simulation target distance in the current wave beam direction according to the platform attitude output by the satellite interface simulator and the wave position information output by the to-be-tested satellite-borne phased array meteorological radar, then calculates the forwarding delay time T0, modulates the simulation echo signal to the wave signal delay T0 according to the parameter table, and forwards the simulation echo signal to the to-be-tested satellite-borne phased array meteorological radar through the radio frequency link.
The invention relates to a dynamic automatic testing method for a satellite-borne phased array meteorological radar, which is used as a preferred mode, and in the step S36, the testing result comprises the following steps: the method comprises the steps of testing the working state of the satellite-borne phased array meteorological radar to be tested, testing the working parameters, testing the beam scanning characteristics and testing the working stability.
The invention relates to a dynamic automatic testing method of a satellite-borne phased array meteorological radar, which is used as an optimal mode, and the method for testing the beam scanning characteristics comprises the following steps: placing a test antenna of an echo simulator in front of an antenna array of the satellite-borne phased array meteorological radar to be tested, when a radar wave beam is swept from one side to the other side, changing the analog signal intensity of the satellite-borne phased array meteorological radar to be tested along with the change of the scanning angle of the antenna wave beam, and judging whether the scanning direction of the wave beam is correct or not according to the position where the envelope appears;
the method for testing the working stability comprises the following steps: the satellite interface simulator compares the echo signal data and the detection data with historical data for analysis, draws a change curve, and judges the working stability according to the trend of the change curve.
A dynamic automatic testing method for a satellite-borne phased array meteorological radar comprises the following steps:
(1) In the test process, a satellite interface simulator is used for simulating a 5-class interface between a satellite platform and a radar, and the satellite interface simulator specifically comprises a power supply interface, an instruction interface, a 1553B bus interface, a remote sensing data transmission interface and a simulation telemetering amount interface, and is used for comprehensively testing a physical interface and a software interface between the radar and the platform. Wherein the power interface supplies power for the radar; the command interface provides a startup and shutdown command for the radar; the 1553 interface sends various instructions or state parameter information to the radar, and simultaneously receives digital information output by the radar, including instruction response, digital telemeasurement and the like; the remote sensing data transmission interface is used for receiving remote sensing data output by the radar; the simulation telemeasurement interface simulates a satellite platform to collect radar simulation telemeasurement such as temperature, power supply voltage and the like.
(2) Testing waveform characteristics of the radar output radio frequency signal by using an echo simulator, such as pulse width, center frequency, pulse repetition interval, wave position residence time, number of transmitted pulses in the wave position and other information;
(3) The dynamic scanning characteristics of the phased array antenna wave beams such as radar wave beam scanning polarity and wave beam scanning stepping can be tested;
(4) A delay forwarding scheme is adopted to dynamically simulate the change condition of the target distance of the radar under different postures and positions of the platform and different scanning angles of the radar, and the working dynamic characteristics of the radar are tested;
(5) Constructing a time system, marking time mark information on a test result of the echo simulator, comparing the time mark information with parameter information in radar remote sensing data, and judging whether the radar works normally or not;
(6) Automatically carrying out comprehensive comparison analysis on telemetering data and remote sensing data output by a radar and radar simulation telemetering data acquired by an interface simulator, carrying out full-automatic data interpretation according to an externally input decision table, and outputting a test result;
in the test process, the radar input parameters have bindable capacity, namely the satellite interface simulator can automatically issue related platform attitude information and instructions of various working modes according to the parameter table;
(7) The radar master-slave single machine working and working modes can be comprehensively and automatically tested according to an externally input task working table;
(8) The method is compatible with two states of radar and platform joint debugging test and radar self test.
The invention comprises a test scheme and test steps, can realize automatic dynamic test of radar, has the characteristics of comprehensive test and high efficiency, greatly reduces the working strength of testers, and improves the test coverage
The invention has the following advantages:
(1) According to the position, the attitude, the radar beam scanning angle and other information of the satellite platform, proper delay time is set, a simulated echo signal is generated in real time, the dynamic test of the radar can be realized, the same as the future in-orbit actual working mode of the radar is realized, and the problems of different actual working states and incomplete coverage of the radar in the conventional radar static test are solved;
(2) In the test process, according to the characteristic that the antenna gain changes relative to a certain fixed direction when a radar wave beam is scanned, an echo simulator is used for receiving and transmitting signals, parameters such as the scanning polarity of the wave beam of the phased array antenna, the wave position residence time, the wave beam stepping amount and the like are measured and checked by analyzing the simulated echo intensity received by the radar and the change characteristic of the signal intensity received by the simulator, the dynamic scanning characteristic of the wave beam in the long-time working process of the radar can be comprehensively tested and checked, and the problem that the scanning characteristic such as the scanning polarity of the wave beam of the phased array radar and the wave position residence time is difficult to dynamically test is solved;
(3) By adopting the modes of test task tabulation, test state parameterization, interpretation automation and the like, the test efficiency and flexibility can be greatly improved, and the test coverage is increased.
Drawings
FIG. 1 is a test block diagram of a dynamic automatic test method of a satellite-borne phased array meteorological radar;
FIG. 2 is a flow chart of a dynamic automatic testing method of a satellite-borne phased array meteorological radar.
Reference numerals:
1. a satellite interface simulator; 2. an echo simulator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.
Example 1
As shown in fig. 1-2, a dynamic automatic testing method for a satellite-borne phased array meteorological radar includes the following steps:
s1, constructing a test system: the method comprises the steps that a testing system is constructed according to the working characteristics of the to-be-tested spaceborne phased array meteorological radar, the testing system comprises a satellite interface simulator 1 and an echo simulator 2, the satellite interface simulator 1 is electrically connected with the to-be-tested spaceborne phased array meteorological radar, the satellite interface simulator 1 is used for simulating an electrical interface of a satellite platform and the to-be-tested spaceborne phased array meteorological radar, providing interface service for the to-be-tested spaceborne phased array meteorological radar, receiving output data of the echo simulator 2 and judging the state of the to-be-tested spaceborne phased array meteorological radar, and the echo simulator 2 is used for receiving radio frequency signals, measuring the radio frequency signals, modulating the echo signals and outputting the to-be-tested spaceborne phased array meteorological radar;
the satellite interface simulator 1 is used for simulating a power interface, an instruction interface, a 1553B bus interface, a remote sensing data transmission interface and a simulation remote measuring interface between a satellite platform and the satellite-borne phased array meteorological radar to be tested; the power interface is used for supplying power to the to-be-tested satellite-borne phased array meteorological radar, and the instruction interface is used for providing a power-on and power-off instruction for the to-be-tested satellite-borne phased array meteorological radar; the 1553 interface is used for outputting instructions, state parameter information and receiving digital information, and the digital information comprises instruction responses and digital telemetering; the remote sensing data transmission interface is used for receiving remote sensing data output by the satellite-borne phased array meteorological radar to be tested; the simulation telemetering interface is used for simulating a satellite platform to acquire radar simulation telemetering, and the simulation telemetering comprises temperature and power supply voltage;
s2, presetting parameters: setting a test task table, a parameter table and a judgment table of the test system, then carrying out self-test on the test system and judging whether the state of the test system is normal, if so, entering step S3; if the abnormal situation exists, positioning the problem and processing the problem, and then entering the step S3;
the test task list comprises whether an internal single machine of the satellite-borne phased array meteorological radar to be tested works as a host machine or a standby machine, a radar working mode switching sequence and working time of each mode;
the parameter table comprises satellite orbit parameters to be simulated and precipitation target parameters to be simulated, the satellite orbit parameters to be simulated comprise platform position information and attitude information, and the precipitation target parameters to be simulated comprise precipitation intensity, precipitation height and precipitation layer number;
judging whether the state of the test system is normal or not according to the decision table;
s3, automatic testing: the satellite interface simulator 1 issues a working instruction to the to-be-tested satellite-borne phased array meteorological radar according to the simulation of the test task table, the to-be-tested satellite-borne phased array meteorological radar works according to the working instruction, and the satellite interface simulator 1 detects working mode data of the to-be-tested satellite-borne phased array meteorological radar; the satellite-borne phased array meteorological radar to be tested performs wave beam scanning according to a working instruction and outputs a radio frequency signal, the echo simulator 2 receives the radio frequency signal and measures signal characteristic parameters and outputs the signal characteristic parameters to the satellite interface simulator 1, the echo simulator 2 modulates the received radio frequency signal into an echo signal and forwards the echo signal to the satellite-borne phased array meteorological radar to be tested in a delayed mode, the satellite-borne phased array meteorological radar to be tested receives the echo signal and processes the echo signal to obtain remote sensing data and feeds the remote sensing data back to the satellite interface simulator 1, the satellite interface simulator 1 judges whether the satellite-borne phased array meteorological radar to be tested is normal or not according to the working mode data, the signal characteristics, the remote sensing data and outputs a test result, and dynamic automatic testing of the satellite-borne phased array meteorological radar is completed;
s31, issuing a working instruction: the satellite interface simulator 1 provides interface services for the satellite-borne phased array meteorological radar to be tested, and then sends a working instruction to the satellite-borne phased array meteorological radar to be tested according to the simulation of a test task table, wherein the interface services comprise power supply providing, control, communication, remote sensing data receiving and analog quantity acquisition;
s32, the radar enters a working state: the satellite interface simulator 1 is used for detecting the working mode data of the to-be-tested satellite-borne phased array meteorological radar;
s33, receiving radio frequency signals: the echo simulator 2 receives radio frequency signals transmitted by the radar and measures characteristic parameters of the signals and outputs the characteristic parameters to the satellite interface simulator 1; the signal characteristic parameters comprise radar pulse width, center frequency, pulse repetition interval, wave position residence time and the number of transmitted pulses in the wave position;
s34, echo signal delay forwarding: the echo simulator 2 modulates the received radio frequency signal into an echo signal and forwards the echo signal to the spaceborne phased array meteorological radar to be tested in a delayed manner;
the generation mode of the echo signal is as follows: the echo simulator 2 calculates the satellite-ground distance according to the position output by the satellite interface simulator 1, calculates the simulation target distance in the current beam direction according to the platform attitude output by the satellite interface simulator 1, the wave position information output by the satellite-borne phased array meteorological radar to be tested and the satellite-ground distance, calculates the forwarding delay time T0, modulates the simulation echo signal into the incoming wave signal according to the parameter table, delays the time T0 and forwards the incoming wave signal to the satellite-borne phased array meteorological radar to be tested through the radio frequency link;
s35, generating and outputting remote sensing data: the satellite-borne phased array meteorological radar to be tested receives the echo signals, processes the echo signals, stamps a timestamp and frames to obtain remote sensing data, and feeds the remote sensing data back to the satellite interface simulator 1 through a remote sensing data channel;
s36, judging the working state: the satellite interface simulator 1 judges whether the satellite-borne phased array meteorological radar to be tested is normal or not by using a decision table according to the working mode data, the signal characteristic parameters and the remote sensing data and outputs a test result, and the dynamic automatic test of the satellite-borne phased array meteorological radar is completed;
the test results include: the method comprises the steps that a working state test result, a working parameter test result, a wave beam scanning characteristic test result and a working stability test result of the satellite-borne phased array meteorological radar to be tested are obtained;
the method for testing the beam scanning characteristics comprises the following steps: placing a testing antenna of an echo simulator 2 in front of an antenna array of the satellite-borne phased array meteorological radar to be tested, when a radar wave beam is swept from one side to the other side, the analog signal intensity of the satellite-borne phased array meteorological radar to be tested changes along with the change of the scanning angle of the antenna wave beam, and judging whether the wave beam scanning direction is correct or not according to the position where the envelope appears;
the method for testing the working stability comprises the following steps: the satellite interface simulator 1 compares the echo signal data and the detection data with the historical data for analysis, draws a change curve, and judges the working stability according to the trend of the change curve.
Example 2
As shown in fig. 1-2, the method is successfully applied to the satellite-borne weather radar, and the dynamic automatic test method of the radar is successfully realized by the method, so that the radar function, flow and performance are efficiently and comprehensively tested and verified during normal-temperature electrical test, environmental test and whole-satellite test of the radar.
Firstly, a set of radar automatic test system is constructed for dynamic test, and the test system is composed of a satellite interface simulator and an echo simulator. The satellite interface simulator is mainly used for simulating various electrical interfaces of a satellite platform and a radar, and providing functions of power supply, control, communication, remote sensing data receiving, analog quantity acquisition and the like for the radar; the echo simulator is used for receiving radio frequency signals output by the radar and measuring signal characteristic parameters such as working frequency, pulse width, pulse repetition frequency, signal intensity and the like; meanwhile, the received radio frequency signals are delayed and forwarded, and the delay time is changed in a self-adaptive mode according to factors such as the simulated target position, the radar beam direction and the radar space position.
In the whole test system, the satellite interface simulator is a control center for automatic dynamic test, and carries out various tests on the radar according to test tasks. And (3) issuing various working instructions by platform interface simulation, checking the feedback of the radar, storing data output by the radar, receiving radar pulse signal characteristic parameters measured by an echo simulator, carrying out comprehensive processing, and judging whether the radar function, the flow and the performance are normal or not.
The radar interface simulator is mainly used for simulating a satellite platform to provide power supply, control communication, remote sensing data receiving, analog quantity acquisition and other functions for the radar. The radar interface simulator simulates an electrical interface between a satellite platform and a radar and mainly comprises a power supply interface, a 1553B bus interface, a remote sensing data transmission interface and a simulation telemetering amount interface. Wherein the power interface supplies power for the radar; the 1553 interface sends various instructions or state parameter information to the radar, and simultaneously receives digital information output by the radar, including instruction response, digital telemeasurement and the like; the remote sensing data transmission interface is used for receiving remote sensing data output by the radar; the simulation telemeasurement interface simulates a satellite platform to collect radar simulation telemeasurement such as temperature, power supply voltage and the like.
The echo simulator is mainly used for receiving radio frequency signals output by the radar and measuring signal characteristic parameters of the radar signals such as working frequency, pulse width, the number of pulses transmitted by each wave position radar, pulse repetition frequency and the like; meanwhile, the received radio frequency signals are delayed and forwarded, and the delay time is changed in a self-adaptive mode according to factors such as the simulated target position, the radar beam direction and the radar space position.
The test procedure was as follows:
1) Test environment construction is carried out according to the figure 2;
2) Binding a test task list for a test system, determining whether a single machine in the radar works as a host machine or a standby machine, and specifying the switching sequence of the radar working modes and the working time of each mode;
3) Binding a parameter table for a test system, wherein the parameter table mainly comprises satellite orbit parameters (including platform position information, attitude information and the like) to be simulated, and simulated precipitation target parameters (including precipitation intensity, precipitation height, precipitation layer number and the like);
4) Binding a decision table for the test system for judging the test result;
5) The test system performs self-checking to judge whether the state of the test system is normal or not;
6) According to the starting sequence of the radar, sequentially giving power-on instructions to the host machine or the standby machine of each single machine of the radar (specifically executed according to the requirements in the test task list), simultaneously carrying out telemetering acquisition on the power-on state of the relevant single machine by a test system, judging according to a judgment list and giving an indication whether the power-on state is abnormal or not;
7) According to the task table, a satellite interface simulator issues a working mode test instruction, the radar works in a certain mode, digital telemetering and remote sensing data output by the radar are received, and telemetering quantities such as temperature and voltage of a relevant single machine in the radar are collected; and meanwhile, the echo simulator receives the radio frequency signal sent by the radar in a corresponding working mode, modulates the simulated target signal on the incoming wave and forwards the signal to the radar. The specific process is illustrated by taking a certain radar 'normal observation' mode as an example. The process is as follows:
a) The interface simulator issues a 'normal observation' instruction through a 1553B bus, so that the radar works in a precipitation mode, and whether the radar response is correct or not is detected; meanwhile, the interface simulator periodically issues broadcast information such as platform position, attitude, system time and the like at regular time through a 1553B interface, and receives data remote measurement such as temperature, voltage and the like output by a radar; and simultaneously, simulating a satellite platform to send a GPS second pulse signal.
b) And the radar enters a normal observation working mode after receiving the instruction information. The radar beam scans according to specified dwell time and stepping, and meanwhile, the radar selects proper Pulse Repetition Frequency (PRF) and the start-stop time of an echo sampling window according to information such as the position, the attitude and the beam scanning of the platform, transmits radar pulse signals, receives echo signals generated by the simulator, processes the echo signals according to design requirements, stamps a timestamp, frames and uploads the processed echo signals to the interface simulator through a remote sensing data channel.
c) The echo simulator receives a radio frequency signal output by the radar through an antenna, measures and stores signal characteristic parameter information such as frequency, pulse width, arrival time, signal intensity and the like of a radar pulse signal;
d) Generating an analog echo signal
(1) Calculating the satellite-ground distance according to the position output by the interface simulator;
(2) Calculating a simulation target distance in the current beam direction according to the platform attitude output by the interface simulator, the wave position information output by the radar and the satellite-ground distance;
(3) Calculating the forwarding delay time T0;
(4) And modulating the analog echo signal into the incoming wave signal according to the configured parameter table, delaying T0 and then forwarding to the radar through the radio frequency link.
8) And (4) analyzing mass data. The test system comprehensively analyzes digital telemetering and remote sensing data output by the radar, analog telemetering of radar temperature, voltage and the like acquired by the interface simulator, and signal characteristic parameter information of radar working frequency, pulse width, signal intensity, arrival time and the like measured by the simulator to judge whether the radar works normally. Mainly comprises the following aspects:
a) Interpretation of working state of each single machine of radar
The comprehensive analysis interface simulator carries out comprehensive evaluation on the working state of each single machine of the radar according to a decision table through the state telemetering information such as temperature, voltage and the like output by the radar simulation telemetering amount interface and the digital telemetering amount information output by the radar.
b) Whether the working parameters of the radar system are normal
The test system classifies radar working parameters and echo data recorded at the current moment in radar working frequency, pulse width, arrival time and other signal characteristics measured by the echo simulator and radar remote sensing data, calculates to obtain parameter information of radar such as pulse repetition frequency, pulse number and the like at different wave positions and different positions, and compares the parameter information with a decision table; and analyzing the position of the simulated echo target in the radar sampling window in the remote sensing data, comparing the measured and analyzed result with a decision table, and judging whether the radar works normally or not.
c) Whether the beam scanning characteristic is normal
The phased array antenna beam is an electrical scanning mode, and the scanning condition of the antenna beam cannot be directly seen, so that the scanning characteristics of the radar beam, such as scanning polarity, wave position dwell time, scanning stepping and the like, need to be tested. During testing, a testing antenna of the echo simulator is arranged at a certain distance from the antenna array surface, when the radar beam is swept from one side to the other side, the intensity of a simulation signal received by the radar from the simulator changes along with the change of the scanning angle of the radar antenna beam, and the amplitude envelope shape can be approximate to a radar antenna directional diagram. Because the radar wave beam adopts step scanning, namely stays for a certain time at each wave position, the echo intensity in the remote sensing signal is distributed in a step shape, and the time width of each step is the stay time of each wave position; the amplitude change of the step is related to the antenna scanning stepping amount; the position where the amplitude envelope appears is when the radar beam is axially aligned with the test antenna, so that when the test antenna of the simulator is placed away from the center of the array surface, whether the scanning direction of the antenna beam is correct or not can be known according to the position where the envelope appears.
d) Evaluation of the stability of the radar in Long-term operation
The test system processes echo signals output in radar remote sensing data and TR component power detection data in remote sensing, compares the data with historical data and analyzes, draws a change curve and evaluates the time stability of radar performance.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (10)
1. A dynamic automatic test method for a satellite-borne phased array meteorological radar is characterized by comprising the following steps: the method comprises the following steps:
s1, constructing a test system: the method comprises the steps that a testing system is constructed according to the working characteristics of the to-be-tested spaceborne phased array meteorological radar, the testing system comprises a satellite interface simulator (1) and an echo simulator (2), the satellite interface simulator (1) is electrically connected with the echo simulator (2), the satellite interface simulator (1) is used for simulating an electrical interface of a satellite platform and the to-be-tested spaceborne phased array meteorological radar, providing interface service for the to-be-tested spaceborne phased array meteorological radar, receiving output data of the echo simulator (2) and judging the state of the to-be-tested spaceborne phased array meteorological radar, and the echo simulator (2) is used for receiving radio frequency signals, measuring radio frequency signals, modulating echo signals and outputting the to-be-tested spaceborne phased array meteorological radar;
s2, presetting parameters: after setting a test task table, a parameter table and a decision table of the test system, performing self-check of the test system and judging whether the state of the test system is normal, if so, entering step S3; if the abnormal situation exists, positioning the problem and processing the problem, and then entering the step S3;
s3, automatic testing: the satellite interface simulator (1) is used for issuing a working instruction to the to-be-tested satellite-borne phased array meteorological radar according to the test task table simulation, the to-be-tested satellite-borne phased array meteorological radar works according to the working instruction, and the satellite interface simulator (1) is used for detecting working mode data of the to-be-tested satellite-borne phased array meteorological radar; the satellite-borne phased array meteorological radar to be tested performs wave beam scanning according to the working instruction and outputs radio frequency signals, the echo simulator (2) receives the radio frequency signals and measures signal characteristic parameters to output the signal characteristic parameters to the satellite interface simulator (1), the echo simulator (2) modulates the received radio frequency signals into echo signals and forwards the echo signals to the satellite-borne phased array meteorological radar to be tested in a delayed mode, the satellite-borne phased array meteorological radar to be tested receives the echo signals and processes the echo signals to obtain remote sensing data and then feeds the remote sensing data back to the satellite interface simulator (1), the satellite interface simulator (1) judges whether the satellite-borne phased array meteorological radar to be tested is normal or not according to the working mode data, the signal characteristics and the remote sensing data and outputs a testing result, and dynamic automatic testing of the satellite-borne phased array meteorological radar is completed.
2. The dynamic automatic testing method for the spaceborne phased array meteorological radar according to claim 1, characterized in that: step S3 includes the following steps:
s31, issuing a working instruction: the satellite interface simulator (1) provides interface services for the satellite-borne phased array meteorological radar to be tested, and then issues a working instruction to the satellite-borne phased array meteorological radar to be tested according to the test task list in a simulated mode, wherein the interface services comprise power supply providing, control, communication, remote sensing data receiving and analog quantity acquisition;
s32, the radar enters a working state: the satellite-borne phased array meteorological radar to be tested performs wave beam scanning according to the working instruction, selects pulse repetition frequency and starting and stopping time of an echo sampling window according to the position and the posture of a satellite platform and a wave beam scanning angle, and outputs the radio frequency signal, and the satellite interface simulator (1) measures parameters of the satellite-borne phased array meteorological radar to be tested in a corresponding working mode;
s33, receiving radio frequency signals: the echo simulator (2) receives the radio frequency signal and measures the signal characteristic parameters to output to the satellite interface simulator (1), wherein the signal characteristic parameters comprise: amplitude, pulse width, arrival time, and frequency;
s34, echo signal delay forwarding: the echo simulator (2) modulates the received radio frequency signal into an echo signal and forwards the echo signal to the satellite-borne phased array meteorological radar to be tested in a delayed manner;
s35, generating and outputting remote sensing data: the satellite-borne phased array meteorological radar to be tested receives the echo signals, processes the echo signals, stamps a timestamp and frames the echo signals to obtain remote sensing data, and feeds the remote sensing data back to the satellite interface simulator (1) through a remote sensing data channel;
s36, judging the working state: and the satellite interface simulator (1) judges whether the satellite-borne phased array meteorological radar to be tested is normal or not by using the decision table according to the working mode data, the signal characteristics and the remote sensing data and outputs a test result, so that the dynamic automatic test of the satellite-borne phased array meteorological radar is completed.
3. The dynamic automatic testing method for the spaceborne phased array meteorological radar according to claim 1, characterized in that:
in the step S1, the satellite interface simulator (1) is used for simulating a power interface, an instruction interface, a 1553B bus interface, a remote sensing data transmission interface and a simulation telemetering amount interface between a satellite platform and the satellite-borne phased array meteorological radar to be tested; the power interface is used for supplying power to the to-be-tested satellite-borne phased array meteorological radar, and the instruction interface is used for providing a startup and shutdown instruction for the to-be-tested satellite-borne phased array meteorological radar; the 1553 interface is used for outputting instructions, state parameter information and receiving digital information, and the digital information comprises instruction responses and digital telemetering; the remote sensing data transmission interface is used for receiving remote sensing data output by the satellite-borne phased array meteorological radar to be tested; the simulation telemetering interface is used for simulating a satellite platform to acquire radar simulation telemetering, and the simulation telemetering comprises temperature and power supply voltage;
in the step S2, the test task list comprises whether an internal single machine of the satellite-borne phased array meteorological radar to be tested works as a host machine or a standby machine, a radar working mode switching sequence and working time of each mode.
4. The dynamic automatic testing method for the spaceborne phased array meteorological radar according to claim 1, characterized in that: in the step S2, the parameter table comprises satellite orbit parameters to be simulated and precipitation target parameters to be simulated, the satellite orbit parameters to be simulated comprise platform position information and attitude information, and the precipitation target parameters to be simulated comprise precipitation intensity, precipitation height and precipitation layer number.
5. The dynamic automatic testing method for the satellite-borne phased array meteorological radar according to claim 1, characterized by comprising the following steps: in step S2, whether the state of the test system is normal is judged according to the judgment table.
6. The dynamic automatic testing method for the spaceborne phased array meteorological radar according to claim 2, characterized in that: in step S32, the working mode data includes digital telemetering, remote sensing data, and analog telemetering of each single unit temperature and voltage of the radar.
7. The dynamic automatic testing method for the satellite-borne phased array meteorological radar according to claim 2, characterized in that: in step S33, the signal characteristic parameters include amplitude, radar pulse width, center frequency, pulse repetition interval, wave position dwell time, and number of pulses transmitted in a wave position.
8. The dynamic automatic testing method for the satellite-borne phased array meteorological radar according to claim 2, characterized in that: in step S34, the echo signal is generated by: the echo simulator (2) calculates the satellite-ground distance according to the position output by the satellite interface simulator (1), then calculates the simulation target distance in the current beam direction according to the platform attitude output by the satellite interface simulator (1), the wave position information output by the satellite-borne phased array meteorological radar to be tested and the satellite-ground distance, then calculates the forwarding delay time T0, modulates the simulation echo signal to the incoming wave signal according to the parameter table, delays the time T0 and then forwards the signal to the satellite-borne phased array meteorological radar to be tested through the radio frequency link.
9. The dynamic automatic testing method for the spaceborne phased array meteorological radar according to claim 2, characterized in that: in step S36, the test result includes: the satellite-borne phased array meteorological radar to be tested comprises a working state test result, a working parameter test result, a wave beam scanning characteristic test result and a working stability test result.
10. The dynamic automatic testing method for the spaceborne phased array meteorological radar according to claim 9, characterized in that: the beam scanning characteristic test comprises a radar beam scanning polarity test and a beam scanning stepping test;
the method for testing the beam scanning characteristics comprises the following steps: placing a testing antenna of the echo simulator (2) in front of an antenna array of the satellite-borne phased array meteorological radar to be tested, when a radar wave beam is swept from one side to the other side, the analog signal intensity of the satellite-borne phased array meteorological radar to be tested changes along with the change of the antenna wave beam scanning angle, and judging whether the wave beam scanning direction is correct or not according to the position where the envelope appears;
the method for testing the working stability comprises the following steps: the satellite interface simulator (1) compares the echo signal data and the detection data with historical data for analysis, draws a change curve, and judges the working stability according to the trend of the change curve.
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