CN108107426A

CN108107426A - A kind of radio altimeter

Info

Publication number: CN108107426A
Application number: CN201810095186.1A
Authority: CN
Inventors: 李琰; 田东徽; 王康; 楚德昌
Original assignee: Heze University
Current assignee: Heze University
Priority date: 2018-01-31
Filing date: 2018-01-31
Publication date: 2018-06-01

Abstract

The invention discloses a kind of radio altimeters, including microprocessor control system, receiving module, transmitting module, digital signal processing module, it is characterized in that digital signal processing module generates pseudo noise code and two-way clock, the pseudo noise code and all the way clock input to transmitting module, and another way clock inputs to receiving module；Digital signal processing module output processing data, digital signal processing module includes A/D converters, programmable logic device FPGA, high-speed dsp chip and RS422, RS232 data interface chip, the programmable logic device FPGA includes impulse scaler, phase accumulator and wave memorizer, and the impulse scaler, phase accumulator, wave memorizer are sequentially connected.Radio altimeter of the present invention uses FPGA, and advantage is level of integrated system height, few without peripheral auxiliary circuits or requirement, has the characteristics that reliability is high, use scope is extensive, is suitble to promote and apply.

Description

A kind of radio altimeter

Technical field

The invention belongs to radio application technical fields, specifically, are related to a kind of radio altimeter.

Background technology

Radio altimeter is important fly as survey aircraft to the airborne radio installation of ground vertical range One of row instruments and meters.The height that it is measured is the true altitude on plane distance ground, is made of transceiver, antenna and indicator. Using ground (or sea) as a kind of height finding radar of reflecting surface.It can accurate survey aircraft be from the ground in a variety of weather conditions The relative altitude on (or sea) is one of necessary navigation equipment on modern aircraft.Also known as radar altimeter (Radar Altimeter).It is different by modulation system, it is divided into CW with frequency modulation radio altimeter and impulse modulation radio altimeter.This As long as the radio altimeter design of two kinds of systems is reasonable, very high altimetry precision is can reach, is obtained for and is widely applied. The realization of radio altimeter hardware system needs to use accumulator and D/A converter when using DDS technology composite signals.It is cumulative Device is generally realized by the controller of system.Simultaneously as the needs of timing control, circuit is also required to controller as control Center.In the prior art using traditional controller, such as microcontroller.Above-mentioned control function can undoubtedly be realized using microcontroller, Main problem is the more complicated peripheral circuit of microcontroller needs, such as crystal oscillator and memory etc., this is to system Reliability brings hidden danger, because complicated circuit is more susceptible to failure, so as to limit its use environment, cannot push away Wide application.Due to early stage airborne radio altimeter there are circuit level it is low, be not easy to split, measurability is poor the shortcomings of, cause Its during the test there are measurability it is not high, safeguard and the problems such as maintenance time is long.

The content of the invention

It is an object of the invention to overcome above-mentioned technology there are the defects of, provide a kind of radio altimeter, which adopts With FPGA, advantage is level of integrated system height, few without peripheral auxiliary circuits or requirement, can carry out self-test, having can By the characteristics of property is high, use scope is extensive, it is suitble to promote and apply.

Its specific technical solution is：

A kind of radio altimeter, including microprocessor control system, receiving module, transmitting module, digital signal processing module, Digital signal processing module generates pseudo noise code and two-way clock, all the way pseudo noise code and clock input to transmitting module, separately Clock inputs to receiving module all the way；Digital signal processing module output processing data, digital signal processing module become including A/D Parallel operation, programmable logic device FPGA, high-speed dsp chip and RS422, RS232 data interface chip, the programmable logic device Part FPGA includes impulse scaler, phase accumulator and wave memorizer, the impulse scaler, phase-accumulated Device, wave memorizer are sequentially connected, and the microprocessor control system is connected with the programmable logic device FPGA, described micro- Processor control system includes selftest module, infrared distance measurement module and alarm module；The selftest module is automatic for altimeter Detection；The infrared distance measurement module is for measurement height；The alarm module sends for altimeter when there are abnormal conditions Alarm.

The content that the selftest module is tested includes altimeter system test, LRU tests, SRU tests, altimeter complete machine Test includes consuming the indexs such as power, sensitivity, a signal, inspection state, working frequency, output power and altimetry error Test, LRU tests include sensitivity, a signal, working frequency, output power, altimetry error, voice signal, opposite instruction Highly dangerous signal provides the test of the indexs such as error, index error, white red illumination, and SRU tests include fault-signal, well The test of the indexs such as signal, residual altitude, total surplus height, U manipulation signals.

Further, the circuit of the programmable logic device FPGA includes constant-temperature crystal oscillator, selecting switch, general purpose I/O, outside Memory, linear voltage regulator.

Compared with prior art, beneficial effects of the present invention：

Radio altimeter of the present invention uses FPGA, and advantage is level of integrated system height, without peripheral auxiliary circuits or requirement Seldom, have the characteristics that reliability is high, use scope is extensive, be suitble to promote and apply.

Description of the drawings

Fig. 1 is the structure diagram of the FPGA of radio altimeter of the present invention；

Fig. 2 is the circuit composition frame chart of the FPGA of radio altimeter of the present invention.

Specific embodiment

Technical scheme is described in more detail in the following with reference to the drawings and specific embodiments.

With reference to Fig. 1-Fig. 2, a kind of radio altimeter, including microprocessor control system, receiving module, transmitting module, Digital signal processing module, digital signal processing module generate pseudo noise code and two-way clock, all the way pseudo noise code and clock Transmitting module is inputed to, another way clock inputs to receiving module；Digital signal processing module output processing data, digital signal Processing module includes A/D converters, programmable logic device FPGA, high-speed dsp chip and RS422, RS232 data-interface core Piece, the programmable logic device FPGA include impulse scaler, phase accumulator and wave memorizer, the pulse point Frequency counter, phase accumulator, wave memorizer are sequentially connected, the microprocessor control system and the programmable logic device Part FPGA connections, the microprocessor control system include selftest module, infrared distance measurement module and alarm module；The self-test mould Block detects automatically for altimeter；The infrared distance measurement module is for measurement height；The alarm module is going out for altimeter Alarm is sent during existing abnormal conditions.

The foregoing is only a preferred embodiment of the present invention, protection scope of the present invention is without being limited thereto, it is any ripe Those skilled in the art are known in the technical scope of present disclosure, the letter for the technical solution that can be become apparent to Altered or equivalence replacement are each fallen in protection scope of the present invention.

Claims

1. a kind of radio altimeter, including microprocessor control system, receiving module, transmitting module, Digital Signal Processing mould Block, it is characterised in that digital signal processing module generates pseudo noise code and two-way clock, and the pseudo noise code and all the way clock input To transmitting module, another way clock inputs to receiving module；Digital signal processing module output processing data, Digital Signal Processing Module includes A/D converters, programmable logic device FPGA, high-speed dsp chip and RS422, RS232 data interface chip, It is characterized in that, the programmable logic device FPGA includes impulse scaler, phase accumulator and wave memorizer, described Impulse scaler, phase accumulator, wave memorizer are sequentially connected, the microprocessor control system and described programmable Logical device FPGA connections, the microprocessor control system include selftest module, infrared distance measurement module and alarm module；It is described Selftest module detects automatically for altimeter；The infrared distance measurement module is for measurement height；The alarm module is for height Table sends alarm when there are abnormal conditions.

2. radio altimeter according to claim 1, which is characterized in that the circuit of the programmable logic device FPGA Including constant-temperature crystal oscillator, selecting switch, general purpose I/O, external memory, linear voltage regulator.