Arbitrary height analog device of pulse-system radio altimeter

A radio altimeter and altitude simulation technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as the inability to test the tracking performance of the altimeter, the inability to test the dynamic tracking ability of the altimeter, and the inability to simulate the pulse loss state.

Active Publication Date: 2015-06-24
NAVAL AERONAUTICAL & ASTRONAUTICAL UNIV PLA
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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 proces

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  • Arbitrary height analog device of pulse-system radio altimeter
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  • Arbitrary height analog device of pulse-system radio altimeter

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Embodiment Construction

[0014] The present invention will be described in detail below with reference to the accompanying drawings.

[0015] The basic principle of altimeter height simulation in the present invention is as follows figure 1 As shown, the signal transformation process in a highly analog process is embodied. First convert the RF pulse modulation signal emitted by the altimeter into a TTL level reference pulse, then perform programmable digital precision delay processing on the rising edge of the reference pulse, and form a delay of the same pulse width according to the measured transmission pulse width Pulse, and then use the pulse signal to perform pulse modulation on the carrier of the same frequency as the altimeter transmission signal, so as to generate an analog echo signal with the same frequency and pulse width as the altimeter transmission signal. The simulation of any height of the altimeter can be realized only by precisely controlling the delay amount of the reference pulse....

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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...

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Application Information

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IPC IPC(8): G01S7/40
CPCG01S7/4052G01S13/882G01S7/4065
Inventor 李文海刘勇王怡苹汪定国吴忠德黄成峰许红星
Owner NAVAL AERONAUTICAL & ASTRONAUTICAL UNIV PLA
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