Ảnh hưởng của sự trượt chu kỳ đến kết quả đo GPS

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Vào từng thời điểm thu được sóng mang tần số L₁ (hoặc L₂) từ một vệ tinh nào đó, thiết bị đo pha trong máy thu chỉ đo được phần lẻ của pha sóng mang (trong  đơn vị chu kỳ). Tuy nhiên, thiết bị đo pha không xác định được số nguyên đa lần bước sóng từ vệ tinh đó đến máy thu vào thời điểm đầu tiên thu được tín hiệu vệ tinh. Số nguyên lần bước sóng nêu trên được gọi là trị nguyên đa trị. Thiết bị đo pha có bộ đếm (counter) cho phép tích luỹ số các bước sóng trôi qua kể từ thời điểm đầu tiên thu được tín hiệu từ vệ tinh đó [43].

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