After wind reversals, old odour arrives while the sensed wind points away from the source, so wind followers, which surge upwind, are misled. A hold gate stores the wind at first odour contact and feeds it to an unchanged follower while the live wind points over 90° away. On 60 random simulated reversing flows it raised a published moth model's success by 10.8 points (95% CI 6.6 to 15.4) and four other followers' by 6.0 to 10.1, but cost the moth model 5 points in steady wind. A fixed wind delay was not resolvably worse at insect scale, but in simulation rescaled to a legged robot's sensors and turn rate the gate beat the best delay for two followers, only one margin surviving Bonferroni correction. As the robot never ran the gate and a plain spiral searcher beat the gated moth model, it is an add-on, not a better searcher.

翻译：暂无翻译