Angle measurement accuracy analysis method for microwave landing receiver

Abstract

The invention provides an angle measurement accuracy analysis method for a microwave landing receiver. The method comprises the following steps of sequentially calculating a signal bandwidth of a scanning signal, a mean square error of an unbiased estimator of a scanning wave beam time interval and a scanning wave beam time interval measurement root-mean-square error after a mathematical model function for a scanning wave beam base-band signal is established, calculating an angle measurement root-mean-square error according to the scanning wave beam time interval measurement root-mean-square error, and finally calculating the CMN (control motion noise) and PFE (path following error) accuracy of azimuth and elevation guidance functions. According to the method, the PFE and CMN accuracy of the azimuth and the elevation of the receiver can be directly obtained, and a theoretical basis and an analysis method are provided for the design of the microwave landing receiver.

Description

technical field [0001] The invention belongs to a microwave landing system (Microwave Landing System, MLS), and is used for analyzing and evaluating the angle measurement accuracy of a microwave landing receiver. Background technique [0002] Microwave landing system is a kind of precision navigation equipment, which is divided into ground equipment and airborne equipment, which provides real-time and accurate guidance signals for aircraft, and the accuracy of angle measurement is an important indicator of microwave landing airborne receiver, which directly affects aircraft navigation. From the collected data, there are not many materials discussing the angle measurement accuracy of the microwave landing receiver, mainly the discussion on the angle measurement accuracy in "International Civil Aviation Organization Annex 10". In the section about power density, it is pointed out that: (20 nautical miles), the CMN mainly comes from the internal noise of the receiver, and the e...

AI Technical Summary

Problems solved by technology

[0006] 1. Internationally, PFE (path following error) and CMN (control motion noise) are usually used to evaluate the performance of the receiver. Here we only point out the CMN error caused by the internal noise of the receiver when the aircraft is at 37 kilometers (20 nautical miles). There is no Considering the angle measurement accuracy of the receiver during the whole landing process of the aircraft, that is to say, the angle measurement performance is not analyzed from the entire dynamic range of the receiver, which is not only incomplete, but also not universal;

[0007] 2. Insufficient consideration is given to the characteristics of the scanning beam, and characteristics such as the scanning speed v of the beam and the bandwidth B of the scanning beam signal are not applied to the calculation of the angle measurement accuracy;

[0008] 3. The signal characteristics of the received signal and the noise characteristics of the receiver are not considered, that is to say, the angle measurement performance of the receiver is not analyzed as a whole

Images