Reading an ERDI datasheet

Every figure ERDI publishes comes with the condition it was measured under. This page explains how to read them, and it is the first thing to read before comparing modules.

Range is a pair, never a single number

A maximum ranging distance is always published together with two things: the target and the atmosphere. The flagship LRF3000A1 is rated at 3,000 m against a 70% reflectivity building target, in clear air, with visibility of at least 4 km. Change either half and the achievable range changes with it.

When comparing two modules, compare the pairs. A larger headline number measured against a more favourable target is not a longer-reaching module.

Accuracy is a formula

Accuracy is published as a fixed near-range term plus a distance-proportional term, because ranging error genuinely behaves that way — the fixed term is set by receiver timing resolution, the proportional term by falling signal strength at distance.

Evaluate the formula at the farthest distance your platform will actually operate at. That is your error budget; the headline near-range figure is not.

Blank means unpublished

Where a parameter is not published for a model, this site leaves the field empty. It is never filled with a family average or a plausible-looking estimate. If a blank cell blocks your design decision, request it — an unpublished figure is often measurable on request, but it will not be guessed here.

Where the authority lies

The specification tables on this site are generated from the same source as the PDF datasheets. If the two ever disagree, the datasheet is correct and the site is wrong; report it and we will fix the site.