Arbitrary height analog device of pulse-system radio altimeter

Abstract

The invention provides an arbitrary height analog device of a pulse-system radio altimeter and belongs to the technical field of testing and diagnosis of avionic devices. Arbitrary height analog, height dynamic change analog and responsive probability analog in an altimeter height measurement range are achieved. The analog device comprises a signal receiving module, a digital signal processing module and a signal emitting module, wherein the signal receiving module performs frequency measurement, wave detection and comparison on signals transmitted by the altimeter, and a reference pulse of TTL level is formed; an FPGA is adopted for performing programmable precise delay, pulse width control, responsive probability analog and other processing on the reference pulse, and delayed pulses with time delay amount, pulse width, the number of the pulses controllable are generated; the signal emitting module achieves analog echo signals of pulse modulation by controlling an analog switch through delayed pulse signals. The radio altimeter arbitrary height analog device is applicable to internal and external field functions of existing various pulse-system radio altimeters, performance detection and performance maintenance.

Description

technical field [0001] The invention belongs to the technical field of avionics equipment testing and diagnosis, in particular to a pulse-system radio altimeter (hereinafter referred to as an altimeter) arbitrary height simulating device, which is suitable for the performance detection of the outer field and the inner field of the airborne altimeter. Background technique [0002] The pulse system radio altimeter is one of the important navigation equipments of the aircraft, which is used to measure the vertical height between the aircraft and the ground. The altimeter converts the height of the aircraft to the ground by accurately measuring the time interval between the high-frequency transmitted pulse and the ground reflected echo pulse, and displays the height value on the indicator. [0003] To test the performance of the altimeter, it is necessary to control the delay of the radio frequency pulse signal emitted by the altimeter on the ground, and then send it back to the...

AI Technical Summary

Problems solved by technology

This method not only has a high cost, but also has great limitations in use, mainly including: (1) only a few specific height values ​​can be simulated, and it is impossible to simulate any height within the altimeter range; (2) only Can carry out static tests at discrete positions, cannot simulate the dynamic change process of the aircraft's altitude during the approach and exit stages, and cannot test the dynamic tracking ability of the altimeter; (3) cannot simulate the partial pulse loss state in actual flight (altimeter transceiver response probability changes) , unable to test the tracking performance of the altimeter in complex terrain

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