CN108037444B - GNSS PCBA automatic test system and application method thereof - Google Patents
GNSS PCBA automatic test system and application method thereof Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 165
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
- G01R31/2815—Functional tests, e.g. boundary scans, using the normal I/O contacts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2834—Automated test systems [ATE]; using microprocessors or computers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2836—Fault-finding or characterising
- G01R31/2844—Fault-finding or characterising using test interfaces, e.g. adapters, test boxes, switches, PIN drivers
Abstract
The application discloses an automatic test system of a GNSS PCBA and an application method thereof, wherein the system comprises a PCBA data board, a power supply, a GNSS antenna unit, a voltage and current acquisition card interface board, an acquisition card, a PC, a TF card and an RS232 serial port module, and the PCBA data board is subjected to functional performance test before the whole machine is assembled, wherein the functional performance comprises but not limited to the voltage, the current, the stability of a communication interface, the GNSS performance index, the bad block detection of an eMMC, the detection of a sensor and the like of the PCBA data board, so that the problem of the PCBA data board after the whole machine is assembled can be avoided, the workload is increased due to the re-disassembly, re-detection and re-assembly of the PCBA data board, the production efficiency is reduced, the quality and the performance index of the GNSS PCBA data board can be ensured, and the reliability of the whole machine equipment is improved; and the automation degree of the testing process is high, excessive manual participation is not needed, the product quality is improved, the production efficiency is improved, the function and the performance of automatically detecting the PCBA data board are realized, the testing efficiency is improved, and the cost of manpower and material resources is saved.
Description
Technical Field
The application relates to the technical field of test detection and the technical field of electronics, in particular to an automatic GNSS PCBA test system and an application method thereof.
Background
With the rapid development of electronic technology and equipment manufacturing industry, the requirements on the reliability of electronic equipment are higher and higher. GNSS (Global navigation satellite system) the global satellite navigation system is widely applied to the fields of surveying and mapping, aerospace, agriculture and animal husbandry, communication medical treatment, traffic environmental protection and the like. PCBA (English Printed Circuit Board +Assemble) data board plays decisive role in the whole GNSS equipment, and all functional performances of the GNSS equipment are determined by the quality of the PCBA data board. Meanwhile, the PCBA data board is also a basis of firmware, and the firmware can stably and well run only if the quality of the PCBA data board is guaranteed, so that the functional requirements of the GNSS measurement equipment can be met. For managing and controlling the quality of PCBA in SMT factory, the defect-containing PCBA data board is checked and key devices on the PCBA board are detected, and the defect-containing key devices are eliminated to play a key role.
In PCBA data boards in the GNSS industry, interfaces among modules are mainly detected and GNSS indexes are detected. Detecting whether interfaces such as RS232, USB, SDIO and the like are normal in communication or not; GNSS index detection, including but not limited to satellite number, signal-to-noise ratio, single point positioning accuracy, RTK (Real-time kinematic) accuracy, etc. Interface communication directly affects the functions of the whole machine, searches satellites, and the like.
The PCBA test protocol used by most foundry is as follows: the PCB is assembled into a complete machine after passing through an SMT process, then the complete machine is sent to a quality inspection department to write the responsive firmware into the PCBA, and the complete machine is started up, and each function is gradually subjected to manual detection test according to a production test instruction book, and the problem is recorded. If one or more functions are found to be abnormal in the test process, the abnormal complete machine is fed back to a maintenance department for problem checking and repairing, and the repaired complete machine is sent to a quality inspection department for inspection again. And packaging the whole machine and warehousing until passing the detection.
As can be seen from the above flow, the process is tedious, the workload is large, and the production efficiency is obviously reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, the application aims to provide a GNSS PCBA automatic testing system and an application method thereof, and aims to solve the problems that after the GNSS PCBA automatic testing process in the prior art is arranged in a whole machine, if a PCBA data board is in a problem, the machine is disassembled again, the detection is carried out, the process is complicated, the workload is large and the production efficiency is influenced.
The application adopts the following technical scheme:
the GNSS PCBA automatic test system comprises a PCBA data board, a power supply, a GNSS antenna unit, a voltage and current acquisition card interface board, an acquisition card, a PC, a TF card and an RS232 serial port module; wherein,
the PCBA data board is a unit to be tested;
the power supply is connected with the PCBA data board and provides power for the PCBA data board;
the voltage and current acquisition card interface board is connected with voltage and current test points of each module on the PCBA data board; the voltage and current acquisition card interface board is also connected with an acquisition card arranged on the main board of the PC;
the acquisition card respectively acquires the voltage and the current of the voltage and the current test points of each module on the PCBA data board through the voltage and current acquisition card interface board; the acquisition card also acquires the voltage and current of the power supply through the voltage and current acquisition card interface board;
the PC is also loaded with upper computer software; the upper computer software compares the voltage and current acquired by the acquisition card with the allowable voltage and current to obtain a conclusion, and provides a basis for a tester to judge whether the voltage and current of each module on the PCBA data board are normal or not;
the TF card stores a system and a firmware program for running the PCBA data board; the TF card is connected with the PCBA data board; the firmware program carries out GNSS index test and module communication test on the PCBA data board;
the RS232 serial port module is arranged between the PC and the PCBA data board; the performance of each module on the PCBA is sent to the PC through the RS232 serial port module;
the upper computer software in the PC machine judges and processes the performance of each module on the PCBA data board;
the GNSS antenna unit is connected with the PCBA data board, searches satellite signals and sends the satellite signals to the PCBA data board; the PC machine stores differential correction data in advance and sends the differential correction data to the PCBA data board through the RS232 serial port module; and the PCBA data board carries out GNSS RTK calculation and tests the RTK precision of the PCBA data board.
Based on the above embodiment, preferably, the acquisition card is an NI PCI-6220 acquisition card.
On the basis of any of the above embodiments, preferably, the voltage and current acquisition card interface board is provided with a plurality of relays; the acquisition card respectively measures the voltage and current of the voltage and current test points of each module on the PCBA data board through a relay on the voltage and current acquisition card interface board.
On the basis of any of the above embodiments, preferably, the PCBA data board includes a WIFI module, a bluetooth module, a GPRS module, and an eMMC module.
On the basis of any of the above embodiments, preferably, the power supply is connected with the PCBA data board through a thimble;
the voltage and current acquisition card interface board is connected with voltage and current test points of each module on the PCBA data board through the ejector pins; the voltage and current acquisition card interface board is also connected with an acquisition card arranged on a main board of the PC through a cable for a PCI interface;
the PCBA data board is provided with an SDIO interface; the TF card is connected with an SDIO interface on the PCBA data board through a cable and a thimble;
the GNSS antenna unit is connected with the PCBA data board through a radio frequency coaxial cable.
On the basis of any of the above embodiments, it is preferable that the power-on key is further included between the power supply and the PCBA data board.
On the basis of any embodiment, the method preferably further comprises a fixture; PCBA data board, power, GNSS antenna unit, voltage and current collection card interface board, collection card, TF card and RS232 serial port module set up in frock clamp.
An application method of the GNSS PCBA automation test system in any of the above embodiments, comprising:
step S1: the PC opens the upper computer software under the control of the user; receiving an operation instruction of a user to upper computer software, and starting to test the software;
step S2: the PCBA data board reads the test program in the TF card to the PCBA data board to run;
step S3: the upper computer software detects whether the voltage and the current of the power supply are within an allowable range; if yes, go to step S4; if not, judging that the power supply has a problem, and stopping the test;
step S4: the starting key is used for switching on a power supply under the control of a user and electrifying the PCBA data board;
step S5: the upper computer software collects the voltage and current of the power supply through the voltage and current collection card interface board, and detects whether the voltage and current values of the power supply are within the allowable range or not again; if yes, go to step S6; if not, judging that the PCBA data board has a problem, stopping the test, and powering off the power supply;
step S6: a voice chip on the PCBA data board drives a loudspeaker to play startup music; if the starting music is played, the step S7 is entered; if the starting-up music is not played, judging that the voice chip works abnormally;
step S7: the upper computer software receives a function test instruction of a user and controls the PCBA data board to execute a test program;
step S8: the PCBA data board executes a test program, performs module voltage and current test, GNSS index test and module communication test, and sends test data to the PC through the RS232 serial port module;
step S9: and processing the test data by upper computer software on the PC, and displaying a test conclusion and a test report.
On the basis of the above embodiment, preferably, the GNSS index test includes testing satellite data, signal-to-noise ratio and accuracy of the GPS L1, GPS L2, B1, B2, B3, GLN L1 and GLN L2 bands.
Based on any of the above embodiments, preferably, the module communication test specifically includes:
reading a firmware version number of the WIFI module;
transmitting an instruction corresponding to the communication test to the Bluetooth module;
sending a command corresponding to the communication test to the GPRS, and performing internet dialing;
and performing detection operation test on the eMMC storage.
Compared with the prior art, the application has the beneficial effects that:
the application discloses an automatic test system of a GNSS PCBA and an application method thereof, wherein functional performance tests are carried out on a PCBA data board before the whole machine is assembled, including but not limited to the functional performances of PCBA data board voltage, current, communication interface stability, GNSS performance indexes, eMMC bad block detection, sensors and the like, so that the problem of the PCBA data board after the whole machine is assembled can be avoided, the workload is increased due to the fact that the PCBA data board is disassembled again, detected again and reinstalled again, the production efficiency is reduced, the quality and performance indexes of the GNSS PCBA data board can be ensured, and the reliability of whole machine equipment is improved; and the automation degree of the testing process is high, excessive manual participation is not needed, the problems of complicated and large workload of the GNSS PCBA automatic testing process in the prior art can be avoided, the product quality and the production efficiency can be improved, the function and the performance of automatically detecting the PCBA data board can be realized, the testing efficiency is improved, and the cost of manpower and material resources is saved.
Specifically, the application can realize:
1. the tested circuit board is protected from being burnt out by high voltage or high current; after the PCB is formed into a PCBA data board through SMT, a detector manually checks whether an original has the conditions of wrong sticking, missing sticking, reverse sticking and the like through AOI, 100% quality problems cannot be guaranteed only by manual visual detection, and once an important integrated chip is misplaced or reversely stuck, the chip is extremely likely to be burnt out due to overvoltage and overcurrent during power-on, and the cost is lost; the application detects the power supply of the system, and reduces the risk of damage to the data board due to overhigh current of the input power supply;
2. the test system is simple and convenient, does not need additional circuit board auxiliary test, and has low cost and high reliability; the test result is returned by using other communication interfaces such as serial ports of the tested PCBA data board, and an additional industrial control board or a singlechip board is not needed to be used for carrying out signal acquisition or function test on the tested PCBA data board; the test fixture is simplified, the complexity is reduced, and the reliability and convenience are improved; the method comprises the steps that communication is carried out through a communication interface of a tested PCBA data board, a CPU on the PCBA data board runs in a memory by reading a test program in a TF card, test results of all modules are transmitted to a PC through communication interfaces such as a serial port and a USB, secondary judgment is carried out by the PC, and the test results are intuitively and practically displayed from a display;
3. the power supply voltage and current of the PCBA data board to be tested can be measured, and the functional performance of the PCBA data board can be tested; the application can detect the voltage and the current of each module on the PCBA data board, and can test the functions and the basic performances of each module; the voltage and current of each module reflect the stability of the module circuit on the other hand; the application collects the voltage and current values of the power supply input by each module through the collection card, and directly displays the measured value and the test result on the upper computer;
4. the key parts can be subjected to functional performance index test analysis; the application can test the key function of the GNSS index, ensures the performance of key parts or key functions of the PCBA data board, and improves the product quality; GNSS indices are particularly important in the field of mapping and measurement industries; the application particularly tests the functional performance index; the method mainly aims at three aspects of satellite number, signal-to-noise ratio and positioning accuracy, ensures that GNSS performance indexes of each PCBA data board are on the same and better level, and basically covers basic functions and performances in the user mapping and measuring process;
5. full-automatic test, high working efficiency and high reliability; excessive manual intervention is not needed in the test process, and the method is simple and convenient to operate; in the testing process, the testers only need to pay main attention to key process points such as power supply voltage and sound, the functional performance test is completely and autonomously tested, and finally visual testing results are returned and stored in the PC.
The application adopts the acquisition card embedded in the PC machine and is used for acquiring the voltage and the current of each module on the PCBA data board, the voltage and the current of the total input power supply are additionally acquired, the circuit board is protected from being burnt out by high voltage and large current, and meanwhile, the acquisition can be completed without adding an additional PCB data board; the PCBA data board is tested for the functional performance, the voltage and the current of each module power supply are tested, excessive manual participation of a tester is not needed in the whole test process, and an upper computer in a PC machine is used for automatically controlling the test, displaying the test result and generating a test report to be stored in a computer; the same differential data is transmitted to the PCBA board card through the RS232 serial port by the PC machine, and the GNSS performance is tested, so that the reliability and consistency of GNSS indexes are ensured.
Drawings
The application will be further described with reference to the drawings and examples.
FIG. 1 shows a schematic structural diagram of an automated GNSS PCBA testing system provided by an embodiment of the application;
fig. 2 is a schematic flow chart of a gesture recognition method for picking up and placing a commodity according to an embodiment of the present application.
Detailed Description
The present application will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.
Detailed description of the preferred embodiments
As shown in FIG. 1, the embodiment of the application provides an automatic testing system for a GNSS PCBA, which comprises a PCBA data board, a power supply, a GNSS antenna unit, a voltage and current acquisition card interface board, an acquisition card, a PC, a TF card and an RS232 serial port module.
The PCBA data board is a unit to be tested, the rest is equipment for realizing comprehensive detection setting of PCBA, and the equipment except a PC (personal computer) can be installed in a special fixture.
The power supply provides power for the PCBA data board, and the power supply can use the nixie tube to display voltage and current. The power supply and the PCBA data board to be tested can be connected through the thimble. And checking whether the power supply voltage and the power supply current are within the allowable range or not by an inspector after the inspector starts the machine, and if not, determining the data board as a problem board.
The GNSS antenna unit may be connected to the PCBA data board via a radio frequency coaxial cable for searching for satellite signals.
The embodiment of the application does not limit the acquisition card, and preferably, the acquisition card can be an NI PCI-6220 acquisition card. The voltage and current acquisition card interface board can be connected with voltage and current test points of each module on the PCBA data board through the ejector pins, and the NI PCI-6220 acquisition card can respectively measure the voltage and current of each point through a relay on the control interface board; the interface board is also connected with an NI PCI-6220 acquisition card arranged on the mainboard of the PC through a PCI interface cable. The interface board is equivalent to the control board of the NI PCI-6220 acquisition card. A plurality of relays can be arranged on the interface board so as to solve the problem that all voltage and current on the PCBA data board can not be tested due to insufficient quantity of analog-digital conversion IO of the NI PCI-6220 acquisition card.
And the voltage and current of each test point acquired by the acquisition card are sent to NI PCI-6220 for processing, and the upper computer software is compared with the allowable voltage and current to obtain a conclusion. And the tester judges whether the power supply voltage of each module on the data board is normal according to the conclusion.
The TF card is used for storing a system and firmware program for running the PCBA data board. The TF card can be connected with an SDIO interface on the PCBA data board through a cable and a thimble. The TF card is particularly important in the test system, and the firmware program in the TF card is used for starting the power supply of each module so as to facilitate the acquisition card to detect the power supply of each module. Meanwhile, the firmware program can test the communication interfaces and the performances of all modules on the PCBA data board. The firmware program can comprise the steps of evaluating the number of the searched satellites of the GNSS board card, signal to noise ratio, single-point positioning precision and RTK positioning precision; and each communication module communication condition, for example, when the PCBA data board includes a WIFI module, a bluetooth module, a GPRS module, and an eMMC module, detect a GPRS module serial port communication, a bluetooth module serial port communication, a WIFI module SDIO interface communication, and an eMMC module detection operation test.
The RS232 serial port module is a communication channel for connecting the PC and the PCBA data board. The performance data of each module on the PCBA is transmitted to the PC through the module, and the upper computer software in the PC judges and processes the performance. Meanwhile, differential correction data pre-stored in the PC is transmitted to the PCBA data board through the serial port so as to carry out GNSS RTK calculation and achieve the purpose of testing RTK precision.
The system may further include a power-on key disposed between the power source and the PCBA data board for controlling the power source to supply power to the PCBA data board.
The system can also be used for an aging test of the PCBA data board, namely, the produced PCBA data board and the fixture are placed in a high-low temperature aging room to perform high-low temperature aging on the PCBA data board, and real-time monitoring and testing data are performed through a PC machine to expose SMT manufacturing defects.
The embodiment of the application performs functional performance tests on the PCBA data board before the whole machine is assembled, including but not limited to the functional performance of PCBA data board voltage, current, communication interface stability, GNSS performance index, eMMC bad block detection, sensor and the like, can avoid the workload increase caused by re-disassembly, re-detection and re-assembly due to the problem of the PCBA data board after the whole machine is assembled, reduces the production efficiency, can ensure the quality and performance index of the GNSS PCBA data board and improves the reliability of the whole machine equipment; and the automation degree of the testing process is high, excessive manual participation is not needed, the problems of complicated and large workload of the GNSS PCBA automatic testing process in the prior art can be avoided, the product quality and the production efficiency can be improved, the function and the performance of automatically detecting the PCBA data board can be realized, the testing efficiency is improved, and the cost of manpower and material resources is saved.
In the first embodiment, the application provides a GNSS PCBA automation test system, and a method for applying the GNSS PCBA automation test system. Since the method embodiments are substantially similar to the system embodiments, the description is relatively simple, and reference should be made to the description of the system embodiments for relevant points. The method embodiments described below are merely illustrative.
Second embodiment
As shown in fig. 2, an embodiment of the present application provides an application method of the GNSS PCBA automation test system in the second embodiment, which includes the following steps.
Step S1, connecting an RS232 serial port line before starting, opening upper computer software on a computer, and clicking to run start test software.
And S2, inserting the TF card loaded with the system and the test firmware into a TF card slot of the tool clamp. During testing, the CPU on the PCBA board reads the test program in the TF card to the memory on the PCBA data board to run.
And S3, turning on a power supply main switch, and checking whether the total voltage and current in the upper computer software are within an allowable range. If so, the process goes to the next step S4. If the input voltage is exceeded or is lower than the input voltage, the power supply module on the tool clamp is problematic, and the problem is required to be checked. Meanwhile, the nixie tube is arranged on the panel of the tool clamp and used for displaying the power supply voltage and current of the power supply module, so that a tester can conveniently and intuitively judge the power supply voltage and current.
And S4, setting a starting key in the tool clamp, and starting the PCBA data board through a tact switch before powering on each time.
And S5, after the power is started, the upper computer software collects the voltage and the current of the power supply through the voltage and current collection card interface board, and judges whether the voltage and the current value of the power supply are within the allowable range or not again, and a result is obtained. If the power supply is not in the allowable range, the test is stopped, and the power supply is automatically powered off. The PCBA data board may have a short circuit or other problems and may be inspected a second time after a technician service confirmation.
And S6, after the power-on is normally started, the voice chip on the PCBA data board works normally to drive the loudspeaker on the tool clamp to play the power-on music. This step is used to detect if the voice function on the data board is normal.
And S7, after the steps are finished, testing other functions of the PCBA data board by a tester by clicking a 'function test' button on the upper computer software.
Step S8, the functional test is mainly divided into 3 parts, including module voltage and current test, GNSS index test and module communication test.
a) Module voltage and current test: the power supply voltage and current of each module on the PCBA data board are mainly tested. In PCBA data board design, each module voltage is controlled individually and a test point of 1mm can be designed at the voltage input and output. The test point is connected with the voltage and current acquisition card adapter plate through the test thimble. The NI PCI-6220 on the PC collects voltage and current information through the adapter plate and displays the information in the upper computer software. And the upper computer software obtains a test conclusion by comparing the allowable voltage current value provided by the designer with the actual measured value. In the upper computer software, the conclusion that the allowable voltage and current are consistent may be displayed in green and prompt PASS, and the conclusion that the allowable voltage and current are not consistent may be displayed in red and prompt FAIL. The tester can intuitively judge whether the voltage of each module of the PCBA data board is normal according to the color, and records the corresponding module of the abnormal PCBA data board, thereby being convenient for maintenance personnel to maintain.
b) And (5) testing GNSS indexes. The test is an important and key functional test of the PCBA data board, and special attention is paid to the test conclusion of the step. The GNSS index test can comprise the steps of testing satellite data, signal to noise ratio and accuracy of 7 frequency bands of a GPS L1, GPS L2, B1, B2, B3, GLN L1 and GLN L2 three-star system; the satellite data may include the number of available satellites, the signal-to-noise ratio may include high and low elevation satellite signal-to-noise ratios, and the accuracy may include single point positioning accuracy and RTK positioning accuracy. During testing, the GNSS antenna and the fixture are required to be reliably connected. The antenna interface on the PCBA data board can be connected with the radio frequency interface on the fixture through the test thimble. The satellite number measurement of each frequency band of each system can be tested by using the satellite number; signal to noise ratio testing signal to noise ratio of satellites with low elevation <30 ° and high elevation >30 °; the precision test comprises the step of testing the single-point positioning precision of each frequency band of each satellite system and simultaneously testing the RTK positioning precision of three satellite systems. The threshold values of satellite number, signal-to-noise ratio and positioning accuracy can be configured by the upper computer software.
c) And (5) module communication test. And the communication test of modules such as WIFI, bluetooth, GPRS, eMMC and the like is mainly tested. The specific method comprises the following steps: reading a firmware version number of the WIFI module; sending a related instruction to the Bluetooth module; sending an instruction to the GPRS and performing internet dialing; and carrying out detection operations such as formatting, writing, copying, deleting and the like on the eMMC storage. The modules are tested to determine whether the design requirements are met.
Step S9, the function test process is automatically completed, and manual intervention is not needed in the process. And the CPU on the PCBA data board directly executes the test program from the TF card to test. In the function test process, the test process is fed back to the PC machine through the RS232 serial port in real time. After the functional test is completed, a test conclusion and a test report are displayed. And the test staff classifies the problems of the PCBA data board according to the test conclusion, and the problem labels are attached to the PCBA data board, so that maintenance staff can maintain the PCBA data board conveniently.
The embodiment of the application performs functional performance tests on the PCBA data board before the whole machine is assembled, including but not limited to the functional performance of PCBA data board voltage, current, communication interface stability, GNSS performance index, eMMC bad block detection, sensor and the like, can avoid the workload increase caused by re-disassembly, re-detection and re-assembly due to the problem of the PCBA data board after the whole machine is assembled, reduces the production efficiency, can ensure the quality and performance index of the GNSS PCBA data board and improves the reliability of the whole machine equipment; and the automation degree of the testing process is high, excessive manual participation is not needed, the problems of complicated and large workload of the GNSS PCBA automatic testing process in the prior art can be avoided, the product quality and the production efficiency can be improved, the function and the performance of automatically detecting the PCBA data board can be realized, the testing efficiency is improved, and the cost of manpower and material resources is saved.
The present application is described in terms of its purpose, performance, progress and novelty, which are all functional improvements and usage requirements emphasized by the patent laws, the above description and drawings are merely preferred embodiments of the present application, and not restrictive, so that all equivalents, modifications, substitutions and modifications which are made according to the patent application scope of the present application are intended to be included in the present application.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. Although the present application has been described to a certain extent, it is apparent that appropriate changes may be made in the individual conditions without departing from the spirit and scope of the application. It is to be understood that the application is not to be limited to the described embodiments, but is to be given the full breadth of the claims, including equivalents of each of the elements described. It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the application as defined in the appended claims.
Claims (9)
1. The GNSS PCBA automatic test system is characterized by comprising a PCBA data board, a power supply, a GNSS antenna unit, a voltage and current acquisition card interface board, an acquisition card, a PC, a TF card and an RS232 serial port module; wherein,
the PCBA data board is a unit to be tested;
the power supply is connected with the PCBA data board and provides power for the PCBA data board;
the voltage and current acquisition card interface board is connected with voltage and current test points of each module on the PCBA data board; the voltage and current acquisition card interface board is also connected with an acquisition card arranged on the main board of the PC;
the acquisition card respectively acquires the voltage and the current of the voltage and the current test points of each module on the PCBA data board through the voltage and current acquisition card interface board; the acquisition card also acquires the voltage and current of the power supply through the voltage and current acquisition card interface board;
the PC is also loaded with upper computer software; the upper computer software compares the voltage and current acquired by the acquisition card with the allowable voltage and current to obtain a conclusion, and provides a basis for a tester to judge whether the voltage and current of each module on the PCBA data board are normal or not;
the TF card stores a system and a firmware program for running the PCBA data board; the TF card is connected with the PCBA data board; the firmware program carries out GNSS index test and module communication test on the PCBA data board;
the RS232 serial port module is arranged between the PC and the PCBA data board; the performance of each module on the PCBA is sent to the PC through the RS232 serial port module;
the upper computer software in the PC machine judges and processes the performance of each module on the PCBA data board;
the GNSS antenna unit is connected with the PCBA data board, searches satellite signals and sends the satellite signals to the PCBA data board; the PC machine stores differential correction data in advance and sends the differential correction data to the PCBA data board through the RS232 serial port module; performing GNSS RTK calculation by the PCBA data board, and testing the RTK precision of the PCBA data board;
an application method of a GNSS PCBA automatic test system comprises the following steps:
step S1: the PC opens the upper computer software under the control of the user; receiving an operation instruction of a user to upper computer software, and starting to test the software;
step S2: the PCBA data board reads the test program in the TF card to the PCBA data board to run;
step S3: the upper computer software detects whether the voltage and the current of the power supply are within an allowable range; if yes, go to step S4; if not, judging that the power supply has a problem, and stopping the test;
step S4: the starting key is used for switching on a power supply under the control of a user and electrifying the PCBA data board;
step S5: the upper computer software collects the voltage and current of the power supply through the voltage and current collection card interface board, and detects whether the voltage and current values of the power supply are within the allowable range or not again; if yes, go to step S6; if not, judging that the PCBA data board has a problem, stopping the test, and powering off the power supply;
step S6: a voice chip on the PCBA data board drives a loudspeaker to play startup music; if the starting music is played, the step S7 is entered; if the starting-up music is not played, judging that the voice chip works abnormally;
step S7: the upper computer software receives a function test instruction of a user and controls the PCBA data board to execute a test program;
step S8: the PCBA data board executes a test program, performs module voltage and current test, GNSS index test and module communication test, and sends test data to the PC through the RS232 serial port module;
the module voltage current test comprises: in the PCBA data board design, each module voltage is independently controlled, a test point with the thickness of 1mm can be designed at a voltage input and output position, the test point is connected with a voltage and current acquisition card adapter board through a test thimble, NIPCI-6220 on a PC machine acquires voltage and current information through the adapter board and displays the voltage and current information in upper computer software, the upper computer software compares an allowable voltage and current value provided by a designer with an actual measured value to obtain a test conclusion, the upper computer software can display and prompt PASS in green in the conclusion conforming to the allowable voltage and current, and the conclusion not conforming to the allowable voltage and current can display and prompt FAIL in red;
the GNSS index test comprises the following steps: satellite data, signal to noise ratio and accuracy of 7 frequency bands of the three-star system of GPS L1, GPS L2, B1, B2, B3, GLN L1 and GLN L2 are tested; the satellite data can comprise available satellite numbers, the signal-to-noise ratio can comprise high and low elevation satellite signal-to-noise ratios, the precision can comprise single-point positioning precision and RTK positioning precision, the GNSS antenna is required to be reliably connected with the fixture during testing, an antenna interface on the PCBA data board can be connected with a radio frequency interface on the fixture through a test thimble, and the satellite numbers can be used for testing satellite number measurement of each frequency band of each system; signal to noise ratio testing signal to noise ratio of satellites with low elevation <30 ° and high elevation >30 °; the precision test comprises the steps of testing single-point positioning precision of each frequency band of each satellite system, and simultaneously testing RTK positioning precision of three satellite systems, wherein the threshold values of satellite number, signal-to-noise ratio and positioning precision can be configured through upper computer software;
the module communication test comprises the following steps: reading a firmware version number of the WIFI module; sending a related instruction to the Bluetooth module; sending an instruction to the GPRS and performing internet dialing; performing detection operations such as formatting, writing, copying, deleting and the like on the eMMC storage; testing the modules to detect whether the modules meet the design requirements;
step S9: and processing the test data by upper computer software on the PC, and displaying a test conclusion and a test report.
2. The GNSS PCBA automation test system of claim 1, wherein the acquisition card is a nipic-6220 acquisition card.
3. The GNSS PCBA automation test system of claim 1 or 2, wherein the voltage and current acquisition card interface board is provided with a plurality of relays; the acquisition card respectively measures the voltage and current of the voltage and current test points of each module on the PCBA data board through a relay on the voltage and current acquisition card interface board.
4. The GNSS PCBA automation test system of claim 1 or 2, wherein the PCBA data board includes a WIFI module, a bluetooth module, a GPRS module, and an eMMC module.
5. The GNSS PCBA automation test system of claim 1 or 2, wherein:
the power supply is connected with the PCBA data board through the ejector pin;
the voltage and current acquisition card interface board is connected with voltage and current test points of each module on the PCBA data board through the ejector pins; the voltage and current acquisition card interface board is also connected with an acquisition card arranged on a main board of the PC through a cable for a PCI interface;
the PCBA data board is provided with an SDIO interface; the TF card is connected with an SDIO interface on the PCBA data board through a cable and a thimble;
the GNSS antenna unit is connected with the PCBA data board through a radio frequency coaxial cable.
6. The GNSS PCBA automation test system of claim 1 or 2, further comprising a power-on key disposed between the power source and the PCBA data board.
7. The GNSS PCBA automation test system of claim 1 or 2, further comprising a tooling fixture; PCBA data board, power, GNSS antenna unit, voltage and current collection card interface board, collection card, TF card and RS232 serial port module set up in frock clamp.
8. An application method of an automatic testing system of a GNSS PCBA according to claim 1, wherein said GNSS index testing includes testing satellite data, signal to noise ratio and accuracy of GPS L1, GPS L2, B1, B2, B3, GLN L1 and GLN L2 frequency bands.
9. The method for applying the GNSS PCBA automation test system according to claim 1 or 8, wherein the module communication test specifically comprises:
reading a firmware version number of the WIFI module;
transmitting an instruction corresponding to the communication test to the Bluetooth module;
sending a command corresponding to the communication test to the GPRS, and performing internet dialing;
and performing detection operation test on the eMMC storage.
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