User's Manual

15
RADAR COMMANDS
*TS COMMAND & HARDWARE SELF-TEST (CONTINUED)
It is recommended that the system uses the following pass/fail criteria for acceptance to specification for a radar
self-test. It is also recommended that after power-up of the radar, the host system calls the radar self-test
function to simulate at least one approaching and one receding target. When in Bi-Directional mode the radar
will report both advancing and receding simulated targets.
When in Advance Mode the radar will only accept and report simulated targets that are advancing. If a recede
simulated target is requested the radar processing will reject the target as ‘wrong direction’ and only
#TS:COMPLETE<CR>
message will be sent as confirmation that the simulation has been completed. When in Recede mode vice
versa.
The hardware target simulator is fully independent of the radar measurement system. This is used to verify
the operation of the radars measurement circuitry. The self-test does NOT operate automatically on power-up
of the radar. During simulation the microwave front end is disconnected from the ADC to avoid any possible
interference with the simulation.
The radar self-test function can be called at any time using the *TS command.
The *TS command calls a pre-loaded simulated test target condition. There is a selection of pre-loaded test
target conditions as set out.
As the test targets are a true simulation of a real target the respective event messages from the radar will occur
at differing times dependant on the simulation called. i.e the time between the Event Start Message and the
Event End Message will be significantly longer if a simulation is for a slow long target than if a simulation for a
fast short target is selected.
To distinguish real targets from simulated targets the radar inserts an X or a Y in the direction fields of all related
messages produced.
Parameter Criteria For Event Start
Message
Criteria For Event End
Message
Criteria For Quality Message
Speed
≤±0.2(mphorKm/h) ≤±0.2(mphorKm/h)
N/A
Distance
≤ ± 0.5 m ≤ ± 0.5 m
N/A
Event Length N/A
≤ ± 0.5 m
N/A
Direction 100% correct 100% correct N/A
Checksum 100% correct
100% correct
100% correct
PeakPowerSpeed(PPS) N/A
N/A
±0.5 of simulated speed
PPS Standard Deviation N/A
N/A
<TBD
Peak Power N/A
N/A
>TBD
% Speed readings N/A
N/A
>95%
% Range Readings N/A
N/A
>95%