CN105306156A - An automated testing system and method for remote sensing satellite data transmission products - Google Patents

Abstract

The invention provides an automatic test system and method for remote sensing satellite data transmission products, which comprises the following steps: PXI system controller: providing a real-time operating system for the whole PXI platform; PXI module set: the test device is connected with a PXI bus and provides a direct interface with a tested product; PXI case: a stable mechanical structure platform and a reliable power supply and heat dissipation system are provided for the PXI system; testing system software: and the PXI module set is matched with the PXI module set to realize corresponding functions and provide an interactive interface with a user. The invention is based on the universal PXI architecture design, and overcomes the defects of large equipment scale, large construction difficulty and long period of the existing remote sensing satellite data transmission ground test system.

Description

An automated testing system and method for remote sensing satellite data transmission products

technical field

The invention relates to the technical field of testing satellite digital transmission products, in particular to an automatic testing system for remote sensing satellite digital transmission products.

Background technique

Remote sensing satellite data transmission subsystem products are generally composed of data preprocessing equipment, baseband data processing equipment and radio frequency processing equipment, complete the processing work of payload data reception, preprocessing, access, formatting, coding, modulation, etc., and provide satellite payload data ground transmission channel.

The satellite data transmission ground test system first needs to complete the inverse process of on-board processing, restore the received radio frequency signal to the original state of the payload data, and complete the signal quality evaluation of the data transmission process. In addition, when performing independent testing of subsystem products, the satellite data transmission ground test system also needs to provide analog interfaces to other systems on the satellite, and provide services such as data broadcasting, command sending, and telemetry collection to the digital transmission subsystem products.

Remote sensing satellite digital transmission ground test system is usually composed of radio frequency test subsystem, baseband test subsystem and data simulation subsystem. A complete set of traditional satellite digital transmission ground test system usually has more than 30 equipments, which is much larger than that of on-board products. quantity. The traditional remote sensing satellite data transmission ground test system has a large scale of equipment, which is difficult to construct and has a long cycle, making it difficult to adapt to the ever-shrinking satellite development cycle.

Therefore, on the premise of not reducing the test function, continuously reducing the scale of equipment, reducing the difficulty of system construction, and shortening the system construction cycle are the development directions of the future remote sensing satellite data transmission ground test.

Contents of the invention

Aiming at the technical problems existing in the above-mentioned prior art, the present invention provides an automatic test system and method for remote sensing satellite digital transmission products. Small size, easy construction and short cycle time.

The present invention is achieved through the following technical solutions:

An automatic test system for remote sensing satellite data transmission products is mainly composed of a PXI system controller, a test function module (PXI module set for short), a PXI chassis and test system software.

The PXI system controller is the core component of the entire test system. It provides Windows or other real-time operating systems for the entire PXI platform. It is an intermediate bridge between PXI modules and system software, and combines PXI modules and software to complete test tasks.

The PXI module set is connected to the PXI bus, and each module provides a relatively independent test function.

Test system software: cooperate with the PXI module set to realize corresponding functions and provide an interactive interface with users.

The PXI Blockset includes:

1) Telemetry acquisition unit: simulates the telemetry acquisition function of the satellite integrated electronic system, collects analog telemetry signals such as power supply, status, and temperature of digital transmission products, processes them into digital signals, and sends them to the PXI system controller through the PXI bus;

2) Interface processing unit: simulate the interface between the satellite integrated electronic system and the digital transmission subsystem, provide data bus interface and command line interface, broadcast platform data to digital transmission products, send injection instructions, collect digital telemetry information of digital transmission products, and pass PXI The bus exchanges data with the PXI system controller.

The PXI module set also includes a radio frequency signal source: generate a specific waveform signal (single carrier or modulated wave) according to the configuration, simulate the radio frequency signal waveform transmitted by the number of satellites, and use it to cooperate with the self-closed loop of the automatic test system for remote sensing satellite digital transmission products. The module can choose mature products released by professional instrument manufacturers.

The PXI module set also includes a high-speed data streaming disk: a real-time large-capacity storage unit for test data, and the data can be played back and processed as required afterwards. This module can be a mature product released by a professional instrument manufacturer.

The PXI module set also includes a vector signal analyzer: complete the down-conversion and intermediate frequency digital conversion functions of the radio frequency signal, cooperate with the application software to complete the quality analysis of the radio frequency signal transmitted by the satellite, and cooperate with the application software and high-speed data streaming disk to complete high-speed sampling data Records, this module can choose mature products released by professional instrument manufacturers.

The PXI module set also includes a programmable attenuator: to complete the signal power adjustment of the radio frequency signal, and perform data interaction with the PXI system controller through the PXI bus. This module can be a mature product released by a professional instrument manufacturer.

The PXI chassis provides a stable and reliable mechanical structure platform for PXI controllers and PXI modules, and has a good power supply system and heat dissipation system design. The chassis can be designed as portable, rack-mounted or desktop according to actual application requirements.

The test system software runs on the operating system platform provided by the PXI controller, including PXI module driver software, system application software and user interface.

PXI module driver software is a driver program developed to cooperate with each test function module, so as to integrate the test function modules into a unified PXI test platform;

System application software is the functional software based on LabVIEW, MATLAB or other program development, completes functions such as test process control, test data simulation, test data analysis, the main application software that the satellite data transmission test system that the present invention is equipped with includes:

1) Automatic test task planning control software: complete the control of the automatic test process of the entire digital transmission subsystem product, organize other application software to work together according to the test case regulations, configure the working parameters of other application software and test function modules, and collect the test results of each module As a result, a test report is generated;

2) System self-inspection control software: send self-inspection commands to each PXI module according to the process, collect feedback data from each PXI module, and output system self-inspection results after comprehensive judgment;

3) Satellite platform data simulation software: Generate simulation data in a specified format according to the interface agreement between the digital transmission subsystem and other satellite systems, including satellite platform broadcast data, telemetry acquisition commands, remote control command data, etc., and execute them through the interface processing unit;

4) Telemetry data analysis software: Receive the remote measurement of the working status of the satellite data transmission product fed back by the PXI module (telemetry acquisition unit, interface processing unit), collect the power supply voltage and current of the power module through the LAN port or LXI port, and perform status analysis according to the agreed rules. Judgment, output telemetry data interpretation results, and have the function of storing and managing telemetry data according to rules;

5) Vector signal analysis software: cooperate with the vector signal analyzer to complete the analysis of the radio frequency signal, complete the digitization and storage control of the intermediate frequency signal, and select the software products that are matched with the vector signal analyzer;

6) Payload data analysis software: complete the data analysis stored in the high-speed data streaming disk, convert I/Q data into bit stream data, complete digital transmission data format inspection, bit error rate analysis, frame format removal, and load data decompression snapshot and other functions, output the main interpretation results, and form a test report;

7) Other application software: application software that completes other functions, such as data distribution software that provides telemetry data LAN broadcast function, LAN time broadcast software that provides test system time calibration function, etc.

The user interface is the interactive interface between the test system and the user, which provides test progress, product status, and test result display, and provides input interfaces such as test case compilation and test parameter setting.

The method for performing automated testing using the above-mentioned automated testing system for remote sensing satellite data transmission products includes the following main steps:

Step 1: Complete the connection between the test equipment and the equipment under test according to the test status, run the automatic test task planning control software, call the system self-inspection control software to start the self-inspection process;

Step 2: The system self-inspection control software collects the self-inspection test results of each module, and feeds back to the automatic test task planning software, and loads the test case after the self-inspection passes;

Step 3: Start the test process according to the time set by the user, and the automatic test task planning control software calls the satellite platform data simulation software, telemetry data analysis software, vector signal analysis software and PXI module, sends instructions, receives and processes telemetry data according to the design use case, Use the high-speed data streaming disk to receive the satellite downlink data, if the telemetry result is abnormal, handle it according to the pre-designed plan;

Step 4: After the test data is received, the automatic test task planning control software starts the load data analysis software, retrieves the I/Q data stored in the high-speed data streaming disk and converts it into bit stream data, and performs data format inspection, bit error rate analysis, Frame format removal, load data decompression snapshot and other functions, generate test reports;

Step 5: The automatic test task planning control software collects the test output of the load data analysis software, combines the telemetry interpretation results, and outputs the final use case test report.

Compared with the prior art, the present invention has the following beneficial effects:

The present invention overcomes the disadvantages of the existing remote sensing satellite data transmission ground test system, such as large-scale equipment, difficult construction, and long cycle time. The PXI architecture design improves the flexibility of the system.

The remote sensing satellite data transmission ground test system disclosed by the invention has certain reference significance for the design of other satellite or spacecraft ground test systems.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 is a block diagram of an automatic test system for remote sensing satellite digital transmission products provided by the present invention.

detailed description

The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

The system of the present invention is based on the general PXI architecture of mature PC technology (PCI Extensions for Instrumentation, PCI extensions for instrument systems, a general test system bus developed by National Instruments).

This embodiment is an automatic test system and test method for small optical remote sensing satellite data transmission products, as shown in FIG. 1 . The optical remote sensing satellite adopts the data transmission scheme of data compression → AOS formatting → cascade coding → QPSK modulation → traveling wave tube amplification → antenna radiation, and uses 1553B bus to communicate with the integrated electronic system, the receiving data rate is 800Mbps, and the channel coding adopts RS+ 3/4 convolutional coding method, the transmission data rate to the ground is 200Mbps, and the data transmission frequency band is the X frequency band.

First determine the configuration scheme of the test system PXI module set and the detailed parameters of each module, as follows:

1) The radio frequency signal source, high-speed data streaming disk, vector signal analyzer and programmable attenuator can be selected from the mature products released by professional instrument manufacturers according to the technical indicators of the products on the star, including the PXI module products produced by Agilent and NI. The selection results are shown in the table below.

Table 1 Module selection table

2) Telemetry acquisition unit: under the control of the application software, it collects 16-channel analog telemetry and 16-channel temperature telemetry of the digital transmission subsystem products. The telemetry acquisition unit performs 10-bit quantization on the input signal of the analog channel. The telemetry acquisition chip adopts HI-546 Or HI-548, the collection results are converted into digital quantities and sent to the controller through the PXI bus, and the telemetry collection cycle is 1 time/2 seconds. Signal acquisition control and communication with PXI bus controller are handled by FPGA. In order to truly simulate the interface between the satellite integrated electronic subsystem and data transmission, the PXI telemetry acquisition unit developed according to the satellite interface control file is designed according to the requirements of the satellite construction specification for grounding, bonding and wiring.

3) Interface processing unit: provide two 1553B bus interfaces (one master and one backup) and 18 OC gate command line interfaces. The 1553B bus control chip of the interface processing board adopts the 61580 chip. Through configuration, one channel is determined as the BC terminal, and the other channel and the data transmission subsystem products are all used as the RT terminal. The chip can be selected from DDC, 58 or 772 products. The connectors use the 1553B connectors certified by AXON Company through ESA. In order to avoid wrong insertion, the connectors of the main bus and the backup bus are selected from different models. The OC gate instruction line interface on the interface processing board adopts 7046 chips, and each 7046 has 6 OC gate drivers, which can carry a load of 40mA. Front-end information processing such as instruction sending, telemetry acquisition and communication with PXI bus controller is completed by FPGA. In order to truly simulate the interface between the satellite integrated electronic subsystem and data transmission, the PXI interface processing unit developed according to the satellite interface control file is designed in accordance with the requirements for grounding, bonding and wiring in the satellite construction specification.

Determine the type selection of the PXI system controller according to the selected PXI module model and application software scale. Considering that the application software running in the PXI controller has higher requirements on the platform processing capability, it is necessary to choose an embedded controller equipped with a processor with more than four cores and a memory of more than 4GB; When the vector signal analyzer works at the same time, the total system bandwidth is high, so it is necessary to choose a product with a total system bandwidth of not less than 2GB/s. The optional product is M9036A produced by Agilent or NI-PXIe-8135 produced by NI. Embedded controller. Specifically for this embodiment, the NI-PXIe-8135 controller of NI is selected.

Determine the PXI chassis selection based on the power and slot count requirements of the selected PXI modules and PXI system controller. Considering that the RF signal source, high-speed data streaming disk, and vector signal analyzer occupy a large number of slots and the power consumption of the module is relatively large, a chassis product with 18 PXI/PXIe slots is selected, and the optional product is produced by Agilent Model M9018A or NI-PXIe-1085 PXI chassis produced by NI. Specifically for this embodiment, the NI-PXIe-1085 chassis of NI is selected.

In terms of PXI module driver software, RF signal sources, high-speed data streaming disks, vector signal analyzers and programmable attenuators are all delivered by the manufacturer with the corresponding drivers, which can be installed on the PXI controller. The main chip in the telemetry acquisition unit and the interface processing unit is FPGA, and the driver control program development of the corresponding PXI module is completed by using the LabVIEW environment running in the controller.

In terms of application software, except for the vector signal analysis software and load data analysis software, which are large in scale and have complex functions, other software can be directly developed using LabVIEW or NITestStand. The vector signal analysis software needs to be matched with the selected PXI vector signal analyzer in the system, and the supplier of the PXI vector signal analyzer provides a supporting software program, such as the 89601VSA software developed by Agilent. The load data subsystem software needs to complete the functions of data processing, analysis and display, and is developed through C++ or C# software.

In terms of user interface, it mainly includes test process status display, use case status display, digital telemetry display, analog telemetry display, data receiving and processing status display, main telemetry curve display, alarm information display, etc., and can be developed using the LabVIEW environment.

Testing with the above-mentioned test system also needs to be equipped with a programmable power supply with a LAN/LXI interface, which is used to supply power to the products on the star. For some satellite data transmission systems without self-inspection function, it is also necessary to equip a load data simulator to simulate the satellite load and send the load data to the digital transmission products.

The implementation manner of a specific case of the present invention has been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims (9)

1. remote sensing satellite number passes a product automation test macro, it is characterized in that, comprising:

PXI system controller: for whole PXI platform provides real time operating system;

PXI module collection: be connected with PXI bus, provides the direct interface with test product;

PXI cabinet: for PXI system provides secure mechanical structure platform, reliably power supply and cooling system;

Testing system software: coordinate with PXI module collection and realize corresponding function, the interactive interface with user is provided.

2. remote sensing satellite number according to claim 1 passes product automation test macro, and it is characterized in that, described PXI module collection comprises following assembly:

Telemetry-acquisition unit: gather the analog telemetering signal that number passes product, be sent to PXI system controller by PXI bus after being processed into digital signal;

Interface processing unit: provide data bus interface and Command Line Interface, passes product broadcast platform data to number, sends the instruction of note number, gather number and pass product digital telemetry data, carry out data interaction by PXI bus and PXI system controller.

3. remote sensing satellite number according to claim 2 passes product automation test macro, it is characterized in that, described analog telemetering signal comprises number and passes the power supply of product, state and temperature.

4. remote sensing satellite number according to claim 2 passes product automation test macro, it is characterized in that, also comprise radio-frequency signal source, specific waveforms signal is generated according to configuration, the radiofrequency signal waveform that analog satellite number transfers out, passes product automation test macro from closed loop for coordinating remote sensing satellite number.

5. remote sensing satellite number according to claim 2 passes product automation test macro, it is characterized in that, also comprises high-speed data flow table, provide the real-time massive store unit of test data, and carry out playback process to data as required.

6. remote sensing satellite number according to claim 2 passes product automation test macro, it is characterized in that, also comprise VSA, complete down-conversion and the intermediate frequency digital translation function of radiofrequency signal, fit applications software completes the radiofrequency signal quality analysis passed down satellite, and fit applications software and high-speed data flow table complete the record of high-speed sample data.

7. remote sensing satellite number according to claim 2 passes product automation test macro, it is characterized in that, also comprises programmable attenuator, completes the signal power adjustment of radiofrequency signal, carries out data interaction by PXI bus and PXI system controller.

8. remote sensing satellite number according to claim 1 passes product automation test macro, and it is characterized in that, described testing system software comprises PXI module driver, system software and user interface.

9. utilize arbitrary described remote sensing satellite number biography product automation test macro in claim 1 to 7 to carry out a method of testing, it is characterized in that, comprise the steps:

Step 1: complete testing equipment by test mode and be connected with Devices to test, runs automatic test assignment planning control software, and calling system self-inspection control software design starts self-inspection flow process;

Step 2: System self-test control software design collects each module self-checking result, and to automatic test assignment planning software feedback, self-inspection is by rear loading test case;

Step 3: start testing process by the time of user's setting, automatic test assignment planning control software transfer satellite platform data simulation software, telemetry analysis software, Vector Signal Analysis software and PXI module, send instruction by design use-case, receive process telemetry, utilize high-speed data flow table to receive satellite down-transmitting data, if measurement telemetry is abnormal, process by the prediction scheme of design in advance;

Step 4: after test data receives, automatic test assignment planning control software startup load data analysis software, transferring the I/Q data transformations stored in high-speed data flow table is bitstream data, carry out data format inspection, error rate analyzer, frame format is removed, load data decompress(ion) such as to look soon at the function, generates test report;

Step 5: the test output of load data analysis software collected by test assignment planning control software automatically, in conjunction with remote measurement sentence read result, exports final use-case test report.