Distance measurement method for automatically eliminating dynamic distance zero value

Abstract

The invention provides a distance measurement method for automatically eliminating a dynamic distance zero value. According to the distance measurement method, operation is easy, convenient and reliable, measurement is accurate, the single processing and information processing way is not limited, and the distance zero value caused by signal processing time delay does not need to be calibrated. According to the technical scheme, the method comprises the steps that at first, a satellite-borne terminal achieves downlink signal processing, at the moment, the measurement value for uplink signals is collected and stored, and the current measurement value is inserted into the next frame of downlink data to execute signal processing related steps; then, a ground terminal receives the downlink information, meanwhile collects the measurement value of the uplink signals and sends the measurement value to a computing terminal, measurement information in a data frame is obtained to be sent to the computing terminal, and the computing terminal obtains a satellite-ground two-way distance measurement value by comparing the measurement value collected by the ground terminal with the measurement information obtained in the next frame of data. According to the distance measurement method for automatically eliminating the dynamic distance zero value, restrictions of an existing method to signal processing and information processing way are thoroughly eliminated, and signal processing and information processing do need to be calibrated.

Description

technical field [0001] The invention relates to a method for an aircraft in the field of measurement and control to measure a target distance through two-way time delay. The "aircraft" here includes satellites, spacecraft, aircraft, and near-space vehicles. Background technique [0002] In the aircraft measurement and control system, distance is a very important measurement element. At present, the systems used for ranging are usually side tone ranging, pseudo code ranging, side tone plus pseudo code mixed ranging and so on. The basic principle of the side tone or pseudo-code ranging system is to measure the distance by phase comparison, by measuring the phase shift / delay of the receiving side tone (receiving code) returned from the target relative to the sending side tone (sending code) to determine the measuring station Radial distance to target. The sidetone ranging system uses multiple sidetone ranging signals. The highest side tone is used to ensure the ranging accu...

AI Technical Summary

Problems solved by technology

The main disadvantage of target distance measurement is: it is difficult to measure multiple targets at the same time

[0004] One is the limitation of delay introduced by signal processing

The existing non-coherent ranging method needs to use zero calibration to correct the time delay introduced by signal processing. It is required that the time delay introduced by signal processing in the task is fixed, the scope of application is narrow, and the requirements for signal processing are relatively high. high

[0005] Second, it is not suitable for dynamic multiplexing of downlink data

Dynamic multiplexing causes the delay of information processing to change dynamically. If the downlink frame synchronization signal is used to sample the uplink signal, the obtained sampling value does not include the delay of this piece of information processing, which cannot be deducted in the final calculation, and due to its dynamic characteristics , and cannot be calibrated by the system zero calibration

[0006] On the one hand, with the continuous improvement of downlink transmission rate, new requirements are put forward for downlink coding and modulation methods. For the requirement of low elevation angle transmission, downlink signal processing introduces signal processing algorithms such as equalization. It is necessary to ensure that these newly introduced signal processing The fixed processing delay of the method will bring higher complexity to the design; on the other hand, for the application and expansion requirements of multi-task loads, dynamic multiplexing of downlink information is a trend in future development

Images