second_filter_tekno_4h {filteRjsats}

Four Hit Filter for Tekno Detections

Description

This function takes an Tekno detection dataframe generated from the add_fish() function and filters it a second time to remove any remaining multipath detections, and then check the remaining detections by comparing the time between detections, for a rolling window of 4 detections to ensure it is less 16.6x the stated pulse rate interval. It additionally checks that all detections have a frequency between 390 and 445 kHz and that the frequency of all detections are within 55kHz of each other. Called by second_filter_4h().

Usage

second_filter_tekno_4h(fish_file)

Arguments

fish_file

a dataframe of detections retrieved from add_fish()

Value

A dataframe which has been filtered to remove false positives

Examples

# Apply a four-hit Teknologics filter to a prefiltered dataset with fish and tag
# attributes
second_filter_tekno_4h(filter_fish_detects)
# No detections are valid