Integrity monitoring method of ionosphere gradient based on kinematical to kinematical platform

An integrity monitoring method of ionosphere gradient, comprising,

• step 1, obtaining original Navigation Satellite System triple-frequency carrier phase observations by a receiver;
• and constructing geometry-free and ionospheric amplification detection statistics by a processor of a processing system, based on the original Navigation Satellite System triple-frequency carrier phase observations, wherein the receiver is coupled to one or more antennas;
• the receiver receives a signal from the one or more antennas, extracts information from the received signal, and provides the extracted information to the processing system, wherein the detection statistics are obtained from the equation (1)
• q
• i
• ,
• j
• =
• ∑
• f
• =
• 1
• 3
• α
• f
• ⁢
• Δ
• ⁢
• ∇
• ϕ
• f
• i
• ,
• j
• =
• ∑
• f
• =
• 1
• 3
• λ
• f
• ⁢
• α
• f
• ⁢
• Δ
• ⁢
• ∇
• N
• f
• i
• ,
• j
• +
• ∑
• f
• =
• 1
• 3
• μ
• f
• ⁢
• α
• f
• ⁢
• Δ
• ⁢
• ∇
• I
• 1
• i
• ,
• j
• +
• ε
• ,
• s
• .
• t
• .
• ∑
• f
• =
• 1
• 3
• α
• f
• =
• 0
• ,
• max
• ⁢
• ∑
• f
• =
• 1
• 3
• ❘
• "\[LeftBracketingBar]"
• μ
• f
• ⁢
• α
• f
• ❘
• "\[RightBracketingBar]"
• ,
• min
• ⁡
• (
• ∑
• f
• =
• 1
• 3
• α
• f
• 2
• )
• (
• 1
• )
• where, q represents the detection statistics, Δ∇ϕ represents double-difference carrier-phase observations, a represents a combination coefficient, λ represents a wavelength, μ represents a ionospheric scale factor, Δ∇N represents a whole-cycle ambiguity, Δ∇I 1 represents a double-difference ionospheric residual on the frequency point of BeiDou B1, ε represents an observation noise, f represents a frequency point of the Navigation Satellite System, and i and j represent corresponding satellites, and
• the selection of the combination coefficient satisfy the following constraints:
• 1):
• geometry-free combination
• ∑
• f
• =
• 1
• 3
• α
• f
• =
• 0
• ;
• 2):
• a delay coefficient of the ionosphere reaches a maximum value to improve a detection sensitivity of a ionosphere gradient anomalies;
• and
• 3):
• a noise amplification coefficient is small enough to minimize the demand for a initialization time
• step 2, adjusting, executed by the processor, a detection threshold based on a required monitoring false alarm rate, and determining whether the detection statistics are less than the adjusted detection threshold,
• step 3, comparing, executed by the processor, a calculated miss-detection rate and a required miss-detection rate, and determining whether the calculated miss-detection rate is less than the required miss-detection rate, and
• step 4, if the detection statistics are less than the adjusted detection threshold and the calculated miss-detection rate are less than the required miss-detection rate, considering the ionosphere gradient is normal, wherein the processing system comprises a bus architecture comprising a number of interconnecting buses and bridges linking together a plurality of circuits comprising at least the processor
• wherein when the detection statistics of a pair of satellites exceeds a detection threshold, sending out alarm, by the processor.