{"id":"96bea34a-6b53-462e-bb92-ebc1ec51a62b","arxiv_id":"2606.27531","paper_version":1,"verdict":"UNVERDICTED","confidence":"LOW","novelty_score":2.0,"correctness_risk":"unknown","formal_verification":"none","parameter_count":0,"one_line_summary":"Student-faculty team built an end-to-end S-band Doppler tracking system for spacecraft but failed to acquire data from the Artemis II Orion mission.","lead":"This paper reports on a university student project that attempted to track the Orion spacecraft during Artemis II using Doppler measurements from its S-band OQPSK transmitter but did not obtain any estimates. A smart generalist might read it to see how educational teams build practical satellite tracking hardware and software from scratch.","discovery_kind":"new_application","skeptic_critique":{"model":"grok-4.3","headline":"Claim of 'fully functional' Doppler system lacks any demonstrated measurement on Orion or other targets","rationale":"The reader's weakest assumption matches the central claim exactly. Because the document is a project report without new scientific claims or validation data, the UNVERDICTED verdict already reflects the absence of demonstrated functionality; the concern identified here does not alter that assessment.","tokens_in":1616,"tokens_out":290,"duration_ms":12270,"concrete_test":"Add a results section containing at least one Doppler time series (e.g., from a known LEO satellite pass or calibrated test tone) with measured frequency offset, expected value from orbital elements, and residual statistics; if the measured shift deviates by more than the reported uncertainty or no such series exists, the 'fully functional' claim is unsupported.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The strongest claim asserts that the constructed receiver, OQPSK signal-processing chain, and analysis pipeline form a fully functional end-to-end system capable of producing usable Doppler measurements. The abstract explicitly states no Doppler estimate was obtained for Orion, and the provided text gives no indication of successful extraction on any other spacecraft, ground test signal, or simulated pass. For this claim to be load-bearing, the pipeline must have been shown to recover frequency shifts accurately; absent such empirical output, the functionality assertion rests only on construction details rather than verified performance.","agreement_with_reader":"agree"},"referee_report":{"model":"grok-4.3","summary":"The manuscript describes an American University student-faculty project to track the Orion spacecraft during Artemis II via Doppler measurements extracted from its S-band OQPSK transmitter. It details the construction of a receiver, OQPSK signal-processing chain, and analysis pipeline, notes that no Doppler estimate was obtained for Orion, and asserts that a fully functional end-to-end satellite tracking system has nevertheless been achieved.","tokens_in":1702,"tokens_out":257,"duration_ms":20778,"significance":"If the functionality claim were supported by demonstrated measurements, the work would offer a useful educational case study in building a low-cost Doppler tracking system for spacecraft. As presented, the absence of any verified output limits its contribution to a descriptive account of hardware assembly without performance validation.","major_comments":[{"comment":"Abstract: the central claim that 'we now have a fully functional end-to-end satellite tracking system' is unsupported, as the text states no Doppler estimate was obtained for Orion and supplies no quantitative verification, error analysis, comparison to known signals, or successful extraction on any other target or test source. This directly contradicts the functionality assertion.","section":"Abstract"}],"minor_comments":[],"recommendation":"major_revision","confidential_remarks":null},"author_rebuttal":{"model":"grok-4.3","summary":"We thank the referee for their constructive comments on our manuscript. We agree that the abstract's functionality claim requires revision to align with the presented evidence, and we address this point below.","responses":[{"response":"We acknowledge the referee's observation is correct: the manuscript explicitly states that no Doppler estimate was obtained for Orion and provides no quantitative validation, error analysis, or successful extraction on test sources. The claim of a 'fully functional end-to-end satellite tracking system' is therefore unsupported by the data presented. We will revise the abstract (and any similar statements in the conclusion) to describe the work as the construction of a receiver, OQPSK processing chain, and analysis pipeline for potential Doppler tracking, without asserting demonstrated end-to-end functionality or successful tracking.","revision_made":"yes","referee_comment":"[Abstract] Abstract: the central claim that 'we now have a fully functional end-to-end satellite tracking system' is unsupported, as the text states no Doppler estimate was obtained for Orion and supplies no quantitative verification, error analysis, comparison to known signals, or successful extraction on any other target or test source. This directly contradicts the functionality assertion."}],"tokens_in":1141,"tokens_out":259,"duration_ms":18303,"standing_objections":[]},"desk_editor":{"model":"grok-4.3","letter":"The main thing to know is that this is a student-faculty project report from American University on assembling a receiver to track Orion during Artemis II via S-band OQPSK signals, but they never extracted a Doppler estimate from the spacecraft or any other source.\n\nThey walk through the hardware choices and the signal-processing steps they set up. The project clearly got students engaged with real space hardware, which is a reasonable educational win and might give other groups a concrete template for similar classroom work.\n\nThe soft spot is the repeated claim of a \"fully functional end-to-end satellite tracking system.\" The abstract itself states no Doppler estimate was obtained, and the text supplies no test-signal results, error bars, or comparison against known orbits to show the pipeline actually recovers frequency shifts. Without that verification the functionality assertion rests on construction details alone.\n\nNothing here is new methodologically. Doppler tracking of S-band spacecraft signals is standard in the existing literature, and the paper adds no derivations, first-principles analysis, or reproducible performance data.\n\nThis is for instructors or students who want to see one group's hardware list and software flow for a tracking exercise. It is not aimed at researchers looking for advances in measurement technique or validation.\n\nI would not send it for peer review. It reads as an internal project summary rather than a research contribution that needs formal refereeing.","headline":"Student project report on building an S-band receiver for Artemis II, but no Doppler measurement was ever shown on any target.","tokens_in":2186,"tokens_out":345,"would_cite":false,"duration_ms":21247,"reading_group":"no","serious_thinker":"yes","would_accept_peer_review":false},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"grok-4.3","headline":"Student project yields a complete Doppler tracking system for S-band spacecraft signals.","keywords":["Doppler tracking","Artemis II","Orion spacecraft","S-band communications","OQPSK modulation","satellite tracking system","student project","spacecraft receiver"],"falsifier":"A verified Doppler frequency measurement obtained from the Orion spacecraft or another S-band transmitter using the described receiver and pipeline.","tokens_in":2508,"feed_emoji":"🛰","tokens_out":542,"duration_ms":21181,"temperature":0.7,"pith_summary":"This report describes a student-faculty project at American University to derive Doppler frequency shifts from the Orion spacecraft's S-band OQPSK transmitter during its Earth-to-Moon flight in the Artemis II mission. The effort focused on building hardware and software to capture and process these signals for educational space science. Although no actual Doppler estimate was obtained from the Orion spacecraft, the team produced and integrated a receiver, signal-processing chain, and data-analysis pipeline. The resulting system is presented as fully functional and ready for satellite tracking applications.","feed_headline":"Student team delivers working Doppler tracker for spacecraft","feed_subtitle":"End-to-end S-band receiver and analysis system complete after Artemis II attempt","key_machinery":"The end-to-end satellite tracking system, which receives S-band OQPSK signals and extracts Doppler frequency shifts through signal processing and analysis.","core_discovery":"The authors establish that their constructed receiver, signal-processing chain, and data-analysis pipeline constitute a fully functional end-to-end satellite tracking system capable of producing usable Doppler measurements from OQPSK-modulated S-band transmissions.","pith_inferences":["Applying the system to ground-based test signals or other known spacecraft would provide direct performance data.","The receiver design could be adapted for additional frequency bands used by different space missions.","Combining the pipeline with public data sources might allow tracking of additional Artemis-era vehicles."],"forward_implications":["The system supports Doppler tracking of other spacecraft that use S-band OQPSK communications.","It provides a working model for deriving frequency data from standard spacecraft downlink signals.","The pipeline can process signals along Earth-to-Moon trajectories for future missions.","The approach demonstrates how student projects can produce practical tools for experimental space tracking."],"fun_headline_variants":["Students finish end-to-end S-band Doppler tracker","Functional spacecraft Doppler system completed by students","Student-built receiver enables Doppler tracking of Orion","End-to-end OQPSK S-band tracker ready for space use","Doppler pipeline for Artemis spacecraft now fully working"],"cache_read_input_tokens":2112,"weakest_assumption_plain":"The built receiver, processing chain, and pipeline form a usable system for Doppler measurements even though no measurement was demonstrated on the Orion spacecraft or any other target.","fun_headline_variants_meta":{"raw":{"variants":["Students finish end-to-end S-band Doppler tracker","Functional spacecraft Doppler system completed by students","Student-built receiver enables Doppler tracking of Orion","End-to-end OQPSK S-band tracker ready for space use","Doppler pipeline for Artemis spacecraft now fully working"]},"model":"grok-4.3","cost_usd":0.005861,"raw_usage":{"total_tokens":2707,"prompt_tokens":510,"num_sources_used":0,"completion_tokens":70,"cost_in_usd_ticks":58612000,"prompt_tokens_details":{"text_tokens":510,"audio_tokens":0,"image_tokens":0,"cached_tokens":256},"completion_tokens_details":{"audio_tokens":0,"reasoning_tokens":2127,"accepted_prediction_tokens":0,"rejected_prediction_tokens":0}},"tokens_in":510,"tokens_out":70,"duration_ms":23446,"temperature":1.0,"reasoning_tokens":2127,"cache_read_input_tokens":256,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-06-29T00:42:24.856980+00:00","model_set":{"reader":"grok-4.3"},"falsifier":"A verified Doppler frequency measurement obtained from the Orion spacecraft or another S-band transmitter using the described receiver and pipeline.","supporting_citations":[],"review_version":1}