Integrity monitoring method suitable for satellite lacking situation of global navigation satellite system (GNSS)

A technology for integrity monitoring and lack of stars, applied in the field of satellite navigation, it can solve the problem that the RAIM algorithm cannot realize fault monitoring, and achieve the effect of improving the integrity

Inactive Publication Date: 2010-10-20
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The method proposed by the present invention solves the problem that the traditional RAIM algorithm cannot realize fault monitoring because the number of satellites in the satellite navigation system is less than 5. 2 The

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  • Integrity monitoring method suitable for satellite lacking situation of global navigation satellite system (GNSS)
  • Integrity monitoring method suitable for satellite lacking situation of global navigation satellite system (GNSS)
  • Integrity monitoring method suitable for satellite lacking situation of global navigation satellite system (GNSS)

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Example Embodiment

[0076] Example 1

[0077] Since BD-1 has only 3 satellites, the lack of satellites for integrity monitoring is an inherent problem, and it has entered the aging stage, the integrity monitoring problem is particularly important. Therefore, taking BD-1 as a research example to further illustrate the method provided by the present invention, there are the following specific implementation steps:

[0078] Step 1. Select the size of the sliding window and determine the detection threshold according to the integrity performance requirements of the satellite navigation system, combined with the accuracy of the inertial navigation;

[0079] In this example, the inertial navigation has high accuracy and is damped by a barometric altimeter. The gyroscope has a zero offset of 0.02 degrees per hour and the accelerometer has a zero offset of 100 mg.

[0080] Integrity performance parameters are selected according to the Minimum Operational Performance Standards (MOPS) established by the Radio Tec...

Example Embodiment

[0094] Example 2

[0095] Select the BD-1 satellite as the faulty satellite, and set the fault deviation from 0m to 150m in steps of 10m. The user’s location is set to near Beijing (116°E, 40°N), and a 5-hour simulation is performed to obtain the fault detection rate curve as image 3 As shown, the fault recognition rate curve is Figure 4 Shown.

[0096] by image 3 It can be seen that after the fault deviation is 40 meters, the fault detection rate is approximately 100%. by Figure 4 It can be seen that the recognition rate is approximately 100% after the fault amplitude is greater than 100 meters. That is, after the fault amplitude is greater than 100 meters, the algorithm can complete fault monitoring well.

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Abstract

The invention discloses an integrity monitoring method suitable for the satellite lacking situation of a global navigation satellite system (GNSS) and belongs to the field of satellite navigation. The method comprises the following steps of: selecting the window size of a sliding window and determining a detection threshold according to the requirement on the integrity of the GNSS and in combination with inertial navigation accuracy; and performing fault detection on the GNSS by a slip accumulation-based multi-sample chi2 detection method so as to judge failure situation and determine a faulty satellite. The problem that fault monitoring cannot be realized in the GNSS under a satellite lacking condition is solved and the integrity of the GNSS is improved. Due to the adoption of the monitoring method provided by the invention, fault deviation is less than 40 meters, fault detection rate is approximately 100 percent, fault magnitude is more than 100 meters and recognition rate is approximately 100 percent.

Description

technical field [0001] The invention belongs to the field of satellite navigation, and specifically refers to a method for autonomous integrity monitoring of an inertial navigation aided receiver when a satellite navigation system lacks satellites. Background technique [0002] Global Navigation Satellite System (GNSS, referred to as satellite navigation system) has the ability to provide high-precision three-dimensional position and velocity information on a global scale. At present, the satellite navigation system has important applications in both military and civilian fields, and has been widely used in many fields such as aviation, aerospace, navigation, vehicle navigation, missile guidance, geodesy, and field rescue. [0003] Integrity is an important factor in evaluating the performance of navigation systems, and it is the guarantee of system safety. Especially in the field of aviation, integrity is directly related to life safety. The wide application of the satelli...

Claims

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Application Information

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IPC IPC(8): G01S19/23
Inventor 李锐原彬张新源黄智刚
Owner BEIHANG UNIV
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