{'fraction_non_alphanumeric': 0.017191977077363897, 'fraction_numerical': 0.0, 'mean_word_length': 5.920792079207921, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Carrier phase null space monitor for ionospheric gradient detection

A new carrier phase-based monitor is developed to instantaneously detect two-dimensional ionospheric gradients. In order to detect gradients at satellite acquisition, it is necessary for ground-based fault detection to rely directly on instantaneous ground facility measurements. The paper proposes a new monitor (termed the null space monitor) by combining measurements from multiple, spatially separated ground antennas through a null space transformation. In addition, comparison results with previously published monitors show that the null space monitor covers the largest possible range of detectable ionospheric gradients.