472
14 Electrical Testing Technology of Lunar Lander
Table 14.3 (continued)
Test mode
OBDH
computer
1553B bus
Data
transmission
channel
Payload
controller
Payload operation
mode
Mode 10
Primary
Backup
Backup
Backup
Payload 1, payload
2 and payload 3 in
operation together
(2)
Mode 11
Primary
Backup
Backup
Backup
Payload 1, payload
2 and payload 3 in
operation together
(2)
Mode 12
Primary
Backup
Backup
Backup
Payload 1, payload
2 and payload 3 in
operation together
(2)
(1) There were some differences in operation mode of payload 1, 2 and 3
(2) There were some differences in operation mode of payload 1, 2 and 3
14.4.4 Test Data Analysis Technology
During the spacecraft testing process, there will be a great many complicated test data
from various channels, including telemetry data, payload data, ground test equipment
data and etc. Interpretation and analysis of test data is the key basis to examine the
function and performance of spacecraft.
The design for test data interpretation should be finished before implementation of test. According to the characteristics of object to be tested, a defined test
data interpretation criterion should be formulated, including interpretation parameters, timing, method, normal range, data comparison requirements and interpretation
report format. On the basis of interpretation criteria formulation, development of test
data automatic interpretation system was also necessary to identify the abnormal data
autonomously in time during tests and help the tester to discover problem. The script
language for description of parameter range and corresponding data interpretation
engine should be included in the test data automatic interpretation system. The script
language could support sophisticated syntax structure and provided conditional judgment, loops, functions and logic control. All the interpretation scripts were stored in
the background knowledge base. During the test, the data interpretation engine read
the interpretation knowledge and deduced the test data. Then it distributed the interpretation results to the test monitoring terminals and stored them in the database.
Automatic interpretation system could implement real-time interpretation of test
data, effective data extraction of complex process, multi-parameter correlation interpretation, historical data statistical analysis and etc. It would improve the portability
of interpretation knowledge, the easy use of interpretation tools and the accuracy of
interpretation results, so that efficient and accurate test methods could be available
for development and test of the lunar lander.
14 Electrical Testing Technology of Lunar Lander
Table 14.3 (continued)
Test mode
OBDH
computer
1553B bus
Data
transmission
channel
Payload
controller
Payload operation
mode
Mode 10
Primary
Backup
Backup
Backup
Payload 1, payload
2 and payload 3 in
operation together
(2)
Mode 11
Primary
Backup
Backup
Backup
Payload 1, payload
2 and payload 3 in
operation together
(2)
Mode 12
Primary
Backup
Backup
Backup
Payload 1, payload
2 and payload 3 in
operation together
(2)
(1) There were some differences in operation mode of payload 1, 2 and 3
(2) There were some differences in operation mode of payload 1, 2 and 3
14.4.4 Test Data Analysis Technology
During the spacecraft testing process, there will be a great many complicated test data
from various channels, including telemetry data, payload data, ground test equipment
data and etc. Interpretation and analysis of test data is the key basis to examine the
function and performance of spacecraft.
The design for test data interpretation should be finished before implementation of test. According to the characteristics of object to be tested, a defined test
data interpretation criterion should be formulated, including interpretation parameters, timing, method, normal range, data comparison requirements and interpretation
report format. On the basis of interpretation criteria formulation, development of test
data automatic interpretation system was also necessary to identify the abnormal data
autonomously in time during tests and help the tester to discover problem. The script
language for description of parameter range and corresponding data interpretation
engine should be included in the test data automatic interpretation system. The script
language could support sophisticated syntax structure and provided conditional judgment, loops, functions and logic control. All the interpretation scripts were stored in
the background knowledge base. During the test, the data interpretation engine read
the interpretation knowledge and deduced the test data. Then it distributed the interpretation results to the test monitoring terminals and stored them in the database.
Automatic interpretation system could implement real-time interpretation of test
data, effective data extraction of complex process, multi-parameter correlation interpretation, historical data statistical analysis and etc. It would improve the portability
of interpretation knowledge, the easy use of interpretation tools and the accuracy of
interpretation results, so that efficient and accurate test methods could be available
for development and test of the lunar lander.