5 Range status interpretation
There are five range statuses: 0, 1, 2, 4, and 7. When the range status is 0, there is no error. Range status 1 and
2 are error warnings while range status 4 and 7 are errors.
When the range status is 1, there is a sigma failure. This means that the repeatability or standard deviation of the
measurement is bad due to a decreasing signal noise ratio. Increasing the timing budget can improve the
standard deviation and avoid a range status 1.
When the range status is 2, there is a signal failure. This means that the return signal is too week to return a good
answer. The reason is because the target is too far, or the target is not reflective enough, or the target is too
small. Increasing the timing buget might help, but there may simply be no target available.
When the range status is 4, the sensor is "out of bounds". This means that the sensor is ranging in a “non-
appropriated” zone and the measured result may be inconsistent. This status is considered as a warning but, in
general, it happens when a target is at the maximum distance possible from the sensor, i.e. around 5 m. However,
this is only for very bright targets.
Range status 7 is called "wraparound". This situation may occur when the target is very reflective and the
distance to the target/sensor is longer than the physical limited distance measurable by the sensor. Such
distances include approximately 5 m when the senor is in Long distance mode and approximately 1.3 m when the
sensor is in Short distance mode. Example: a traffic sign located at 6 m can be seen by the sensor and returns a
range of 1 m. This is due to “radar aliasing”: if only an approximate distance is required, we may add 6 m to the
distance returned. However, that is a very approximate estimation.
UM2510
Range status interpretation
UM2510 - Rev 1
page 13/26
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