Intelligent phase calibration method for spaceflight TT&C system

Abstract

This invention discloses an intelligent phase correction method for aerospace telemetry and control systems, comprising the following steps: after the antenna is pointed to a signal source that meets the far-field conditions, the azimuth error voltage and elevation error voltage are recorded for the first time; based on the first recorded azimuth error voltage and elevation error voltage, a corresponding preset offset rule is selected, and the antenna is offset by a certain angle according to the selected preset offset rule; after the antenna offset is completed, the azimuth error voltage and elevation error voltage are recorded for the second time; the phase shift value is calculated based on the two recorded azimuth error voltages and elevation error voltages. Compared with the two-point method for phase correction, the phase correction process of this invention does not require setting the initial value of the phase shifter, and the antenna offset direction can be selected autonomously, thereby improving the success rate of phase correction.

Description

Technical Field

[0001] This invention relates to the field of aerospace telemetry and control system technology, and in particular to an intelligent phase correction method for aerospace telemetry and control systems. Background Technology

[0002] When tracking spacecraft, telemetry and control antennas often employ a sum-difference amplitude-ratio single-pulse tracking method to achieve the required tracking accuracy. Single-pulse tracking receivers are widely used in aerospace telemetry and control systems. Because the transmission paths of the sum and difference signals differ, the time delays of the two signals are different, meaning their phase delays are different. Therefore, it is necessary to phase-shift the reference signal in the single-pulse tracking receiver to ensure that the correct angular error voltage is demodulated. The process of obtaining the phase-shift value is called phase correction.

[0003] Currently, the commonly used phase correction method is the two-point method: First, guided by theoretical angle data, the antenna is pointed towards a signal source (beacon, radio source, synchrotron, etc.) that meets the far-field conditions. Then, an initial phase shift value is set, and the azimuth and elevation error voltages at the first point are recorded. Next, the antenna is offset by a fixed angle in a fixed direction, and the azimuth and elevation error voltages at the second point are recorded. Finally, the required phase shift value is calculated using theoretical formulas. The two-point method requires no static signal source and is fast. However, this method requires setting the initial value of the phase shifter and does not allow for independent selection of the antenna offset direction. The success rate of phase correction is highly dependent on the theoretical angle data, and is relatively low when the theoretical angle data error is large. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an intelligent phase correction method for aerospace telemetry and control systems. The phase correction process does not require setting the initial value of the phase shifter and can autonomously select the antenna offset direction, resulting in a high phase correction success rate.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A smart phase correction method for an aerospace telemetry and control system includes the following steps: after the antenna is pointed to a signal source that meets the far-field conditions, the azimuth error voltage and elevation error voltage are recorded for the first time; based on the azimuth error voltage and elevation error voltage recorded for the first time, a corresponding preset offset rule is selected, and the antenna is offset by a certain angle according to the selected preset offset rule; after the antenna is offset, the azimuth error voltage and elevation error voltage are recorded for the second time; and the phase shift value is calculated based on the azimuth error voltage and elevation error voltage recorded for the two times.

[0007] The beneficial technical effects of this invention are as follows: In the above-mentioned intelligent phase correction method for aerospace telemetry and control systems, after the antenna is pointed to a signal source that meets the far-field conditions, the azimuth error voltage and elevation error voltage are recorded for the first time. Based on the azimuth error voltage and elevation error voltage recorded for the first time, a corresponding preset offset rule is selected, and the antenna is offset at a certain angle according to the selected preset offset rule. After the antenna is offset, the azimuth error voltage and elevation error voltage are recorded for the second time. The phase shift value is calculated based on the azimuth error voltage and elevation error voltage recorded for the two times. Compared with the two-point method for phase correction, the phase correction process of this invention does not require setting the initial value of the phase shifter and can autonomously select the antenna offset direction, thereby improving the success rate of phase correction. Attached Figure Description

[0008] Figure 1 This is a flowchart illustrating the intelligent phase correction method for aerospace telemetry and control systems of the present invention.

[0009] Figure 2 This is a flowchart illustrating the intelligent phase correction method for aerospace telemetry and control systems in Embodiment 1 of the present invention.

[0010] Figure 3 This is a flowchart illustrating the intelligent phase correction method for aerospace telemetry and control systems in Embodiment 2 of the present invention. Detailed Implementation

[0011] To enable those skilled in the art to more clearly understand the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0012] like Figure 1 As shown, the intelligent phase correction method for aerospace telemetry and control systems of the present invention includes the following steps:

[0013] S10. After the antenna is pointed to a signal source that meets the far-field conditions, record the azimuth error voltage and elevation error voltage for the first time.

[0014] S20. Select the corresponding preset offset rule based on the azimuth error voltage and elevation error voltage recorded for the first time, and offset the antenna by a certain angle according to the selected preset offset rule.

[0015] S30. After the antenna offset is completed, record the azimuth error voltage and elevation error voltage for the second time.

[0016] S40. Calculate the phase shift value based on the azimuth error voltage and pitch error voltage recorded twice.

[0017] The intelligent phase correction method for aerospace telemetry and control systems of the present invention eliminates the need to set the initial value of the phase shifter during the phase correction process and allows for autonomous selection of the antenna offset direction, thereby improving the success rate of phase correction.

[0018] Example 1:

[0019] Figure 2 A flowchart illustrating the intelligent phase correction method for aerospace telemetry and control systems in this embodiment is shown.

[0020] like Figure 2 As shown, after the antenna is pointed at a signal source that meets the far-field conditions, the current azimuth error voltage and elevation error voltage are recorded for the first time, and the current phase shift value is read. The azimuth error voltage is denoted as V. A1 The pitch error voltage is denoted as V. E1 The current phase shift value is denoted as Ph1, and the gain coefficient is denoted as G1.

[0021] Phase calibration procedure determines azimuth error voltage V A1 Whether the value is positive or negative, if it is positive, the antenna is offset by a certain angle in the positive azimuth direction (increasing the azimuth angle), denoted as ΔA; if it is negative, the antenna is offset by a certain angle in the negative azimuth direction (decreasing the azimuth angle). The specific offset angle is related to the antenna beamwidth and the antenna pointing accuracy. The antenna offset angle should be greater than or equal to ten times the pointing accuracy and less than or equal to one-sixth of the antenna beamwidth.

[0022] After the antenna biasing is completed, the azimuth error voltage and elevation error voltage are recorded for the second time. The azimuth error voltage is denoted as V. A2 The pitch error voltage is denoted as V. E2 And read the current phase shift value, denoted as Ph2.

[0023] Calculate the phase shift value based on the azimuth error voltage and pitch error voltage recorded twice: Let the phase deviation value be ΔPh, the required gain coefficient be G2, and the error voltage generated per unit angle of the system's bias be V. d .

[0024] When V E2 -V E1 When not equal to 0,

[0025]

[0026] When V E2 -V E1 When V equals 0, if A2 -V A1 If the value is positive, ΔPh = 180 (degrees).

[0027] When V E2 -V E1 When V equals 0, if A2 -V A1 The value is negative, ΔPh = -180 (degrees).

[0028]

[0029] The correct phase shift value Ph = Ph² + ΔPh.

[0030] Figure 3 A flowchart illustrating the intelligent phase correction method for aerospace telemetry and control systems in this embodiment is shown.

[0031] like Figure 3 As shown, after the antenna is pointed at a signal source that meets the far-field conditions, the current azimuth error voltage and elevation error voltage are recorded for the first time, and the current phase shift value is read. The azimuth error voltage is denoted as V. A1 The pitch error voltage is denoted as V. E1 The current phase shift value is denoted as Ph1, and the gain coefficient is denoted as G1.

[0032] The phase correction procedure determines the pitch error voltage, which is recorded as V. E1 Whether the value is positive or negative, if it is positive, offset the antenna in the positive direction by a certain angle (increase the elevation angle), denoted as ΔA; if it is negative, offset the antenna in the negative direction by a certain angle (decrease the elevation angle). The specific offset angle is related to the antenna's beamwidth and pointing accuracy. The antenna offset angle should be greater than or equal to ten times the pointing accuracy and less than or equal to one-sixth of the antenna beamwidth.

[0033] After the antenna biasing is completed, the azimuth error voltage and elevation error voltage are recorded for the second time. The azimuth error voltage is denoted as V. A2 The pitch error voltage is denoted as V. E2 And read the current phase shift value, denoted as Ph2.

[0034] Calculate the phase shift value based on the azimuth error voltage and pitch error voltage recorded twice: Let the phase deviation value be ΔPh, the required gain coefficient be G2, and the error voltage generated per unit angle of the system's bias be V. d .

[0035] When V E2 -V E1 When not equal to 0,

[0036]

[0037] When V E2 -V E1 When V equals 0, if A2 -V A1 If the value is positive, ΔPh = 180 (degrees).

[0038] When V E2 -V E1 When V equals 0, if A2 -V A1 The value is negative, ΔPh = -180 (degrees).

[0039]

[0040] The correct phase shift value Ph = Ph² + ΔPh.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Those skilled in the art can make various equivalent changes and improvements based on the above embodiments, and all equivalent variations or modifications made within the scope of the claims should fall within the protection scope of the present invention.

Claims

1. A method for intelligent phase calibration of a spaceflight TT&C system, characterized in that, The intelligent phase correction method for the aerospace telemetry and control system includes the following steps: S10. After the antenna is pointed to a signal source that meets the far-field conditions, record the azimuth error voltage and elevation error voltage for the first time. S20. Select the corresponding preset offset rule based on the azimuth error voltage and elevation error voltage recorded for the first time, and offset the antenna by a certain angle according to the selected preset offset rule. S30. After the antenna offset is completed, record the azimuth error voltage and elevation error voltage for the second time. S40. Calculate the phase shift value based on the azimuth error voltage and pitch error voltage recorded twice; Step S40 further includes: S41. Calculate the phase deviation value based on the azimuth error voltage and pitch error voltage recorded twice; S42. After the antenna offset is completed, add the measured phase shift value and the phase deviation value to obtain the correct phase shift value; Step S41 calculates the phase deviation value using the following formula: When is not equal to 0, ; When is equal to 0, if is positive, ; When If is negative, ; wherein , denote the azimuth error voltage and the tilt error voltage of the first recording, , denote the azimuth error voltage and the tilt error voltage of the second recording, denote the phase deviation value.

2. The intelligent phase correction method for aerospace telemetry and control systems as described in claim 1, characterized in that, Step S20 further includes: determining the sign of the first recorded azimuth error voltage; if the first recorded azimuth error voltage is positive, then the antenna is offset in the positive direction by a certain angle; if the first recorded azimuth error voltage is negative, then the antenna is offset in the negative direction by a certain angle.

3. The intelligent phase correction method for aerospace telemetry and control systems as described in claim 1, characterized in that, Step S20 further includes: determining the sign of the first recorded pitch error voltage; if the first recorded pitch error voltage is positive, then the antenna is offset in the positive direction by a certain angle; if the first recorded pitch error voltage is negative, then the antenna is offset in the negative direction by a certain angle.

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