CN104683042A - Handheld emergency position indication radio beacon (EPIRB) detector based on XC5VLX85T - Google Patents

Abstract

The invention discloses a handheld emergency position indication radio beacon (EPIRB) detector based on XC5VLX85T. The detector comprises a radio frequency signal processing module, a digital signal processing module, a liquid crystal display (LCD) display control module, and a power supply module. The system of the detector can detect the carrier frequency, error rate and transmitting format of an EPIRB transmitter according to the parameter setting. The detector is a handheld mobile terminal, and receives an EPIRB modulation signal through an antenna or a coaxial cable; after being filtered and amplified by a low noise amplifier (LNA), the signal is mixed with local carrier; then the signal passes through a band-pass filter and is sampled by an analog-digital converter, and two paths of signals of I and Q are acquired through an orthogonality demodulation method; digitalized intermediate frequency demodulation is performed on the signals; after decoding by a broadcast channel (BCH), the LCD displays a result in images. The EPIRB detector based on XC5VLX85T has functions of network transmission, storage, and imaging display of the detection result, can be applied to EPIRB detection in navigation field, and helps to promote safe operation of navigation.

Description

A kind of hand-held EPIRB detector based on XC5VLX85T

Technical field

The present invention relates to a kind of detector, particularly a kind of hand-held EPIRB detector based on XC5VLX85T, can detect the carrier frequency of navigation emergency position-indicating radiobeacons used, analysis protocol content also analyzes the error rate, transmitting form, thus judges that whether its running status is normal.

Background technology

Emergency position-indicating radiobeacons (Emergency Position Indication Radio Beacon, abbreviation EPIRB) be a kind of can the beacon of transmitted radio signal, the radiofrequency signal of utilization transmitting itself represents oneself position and state, so that SAR Unit determines its position exactly, it is the warning device of ship to shore important in GMDSS (GMDSS).International Maritime Organization IMO specifies, the above freighter of all 300 gross tons and be applicable to the so-called Convention ship of " SOLAS " pact, no matter navigates by water in A1, A2, A3 or A4 navigating area, except A1 navigating area can replace with VHF EPIRB, all must be equipped with satellite EPIRB.

According to the United Nations's data: nineteen eighty-two, successful rescue goes out Canada Aircraft three people in danger first, and 1982-1997 successful rescue 8638 people, be all in 1997, system starts 1284 times, has 1284 people to be successfully rescued.According to China's statistics: 1982-1999, the whole world receives 3361 alarms altogether, has 11227 people to be rescued.

GMDSS is Global Maritime Distress and Safety Syst (Global Maritime Distress and Safety System).On February 1st, 1999, GMDSS system in the whole world each shipping state enable comprehensively.Different from the distress call " SOS " of extensive use before this, GMDSS communicates new system---" GMDSS " between a ship bank.It is made up of satellite communication system and terrestrial radio communication system two large divisions.Satellite system comprises again international maritime satellite subsystem and pole low orbit search and rescue satellite subsystem two parts.GMDSS is based upon the AS on the basis of advanced communication technology of satellite, digital technology and computer technology, when ship is wrecked, the information of helping out of distress can not only be sent more rapidly, more reliably, the artificial type of alarm before can also replacing in automatic, automanual mode to larger scope.

25th the COSPAS-SARSAT conference of 2000 is made decision: COSPAS-SARSAT system will stop the satellite-signal of process 121.5/243MHz from 1 day January in 2009, needing of all 121.5/243MHz of holding position indicating marks is alternative with the position indicating mark of 406MHz as early as possible, only have the signal of 406MHz could by system discovery, so all EPIRB, ELT, PLB will be affected.So when development detector, consider that 121.5/243MHz is nonsensical, only need to consider 406MHz detector.

Newly-increased SOLAS pact IV/15.9 article defines the service test requirement of 406MHz satellite EPIRB, and comes into force on July 1st, 2002.Service test should use suitable checkout equipment, and checkout equipment can complete all test events of this directive/guide requirement.

(1) whether check installation site and install affects from floating operation;

(2) the short rope of buoyancy of EPIRB is confirmed in order; This short rope answers folding and unfolding appropriate, should not be connected with hull or support;

(3) visual examination;

(4) conventional self-checking is carried out;

(5) check whether the identification code (15 hexadecimal ID codes and other information required) of EPIRB is clearly indicated in device external;

(6) read 15 hexadecimal ID codes of EPIRB and out of Memory from middle solution that transmit, check separate the information (15 hexadecimal ID codes or MMSI/ wail, the requirement according to competent authority) that reads whether with beacon identifies consistent;

(7) by the registration situation of relevant document or national coding registration unit verification equipment;

(8) term of validity of battery is checked;

(9) as being suitable for, hydrostatic pressure releasing device and the term of validity thereof is checked;

(10) under self test mode, detecting the emission state in 406MHz frequency range, or for avoiding, distress call being sent to satellite, adopt suitable checkout equipment to carry out;

(11) as possibility, under self test mode, detect the emission state in 121.5MHz frequency range, or start satellite system for avoiding, adopt suitable checkout equipment to carry out;

(12) check whether EPIRB is safeguarded by the bank base maintenance agency approved according to competent authority's specific time interval;

(13) upon completion of the assays, reinstall EPIRB, check that EPIRB is not activated;

(14) operation manual preserving EPIRB is confirmed.

Wherein (6), (10) and (11) need detector just can complete.External satellite position indicating mark detector product, the satellite position indicating mark detector that the ARG series of mainly Britain IESM production at present and JOTRON company of Norway produce.IESM product is made up of two parts: signal processing unit and palm PC.Wherein power unit adopts 9V baby battery, and normal reading code just needs for 2 ~ 3 times to change, and without printout mouth, common test record cannot print preservation.The product of JOTRON company is only then a code reading device, can not show other information such as receive frequency, does not have and to communicate with PC and the function such as printing.In addition, use external product existence year calibration test problems, domestic do not have corresponding testing agency, and annual test all needs to return genuine solution with repairing, and adds production cost. have impact on timeliness.At present, the said goods still in ship survey at home and abroad in occupation of dominant position, also Wei You producer formally produces at home.

Summary of the invention

The present invention is directed to the problems referred to above, provide a kind of carrier frequency that can detect navigation emergency position-indicating radiobeacons used, analysis protocol content also analyzes the error rate, transmitting form, judges the whether normal detector of emergency position-indicating radiobeacons running status.

For realizing this technical purpose, the solution of the present invention is: a kind of hand-held EPIRB detector based on XC5VLX85T, it is characterized in that: be made up of radio-frequency signal processing module, digital signal processing module, LCD display control module, power module, detector system according to setting parameter, can detect carrier frequency, the error rate, the transmitting form of EPIRB transmitter.

Described a kind of hand-held EPIRB detector based on XC5VLX85T, it is characterized in that: described EPIRB detector take XC5VLX85T as the core of digital signal processing module, adopt the rough frequency measurement of FFT, Costas ring carries out pinpoint accuracy carrier frequency measurement, and quadrature demodulation carries out demodulation to signal.

Described a kind of hand-held EPIRB detector based on XC5VLX85T, it is characterized in that: described EPIRB detector radio frequency part is made up of as frequency mixer as local oscillator, multiplier ADL5391 low noise radio frequency amplifier ADL5523, integrated phase lock ADF4350, realizes frequency down-conversion function.

Described a kind of hand-held EPIRB detector based on XC5VLX85T, it is characterized in that: described EPIRB detector LCD display control module is connected to digital signal processing module, LCD display can display measurement data, and can operate touch-screen and to modify setting to instrument parameter.

Described a kind of hand-held EPIRB detector based on XC5VLX85T, is characterized in that: described EPIRB detector power module adopts high capacity lithium ion battery to power, and instrument volume is little to be convenient for carrying.

Accompanying drawing explanation

Fig. 1 is structured flowchart of the present invention

Fig. 2 is circuit diagram of the present invention

Embodiment

Below in conjunction with the drawings and specific embodiments, the present invention is described in further details:

EPIRB detector is core with XC5VLX85T, and system is made up of two large divisions.Radio frequency part is made up of low noise amplifier ADL5523, integrated phase lock ADF4350, multiplier ADL5391, realizes frequency down-conversion function, and display module is the TFT liquid crystal display screen of resolution 320*240.

Radio-frequency front-end processing section is the basis of back-end processing, is the key factor in system.The problem such as DC shift and image frequency suppression is there is in zero intermediate frequency scheme.Adopt zero intermediate frequency technology, need receiver to carry out quadrature demodulation, export I, Q two-way, demodulation of then sampling respectively.Two factors need to consider, one is the selection of IF-FRE; Two is selections of sampling rate.The selection of intermediate frequency needs the speed of the bandwidth of consideration signal, processor, the mirror image of receiver mixing suppresses.The signal bandwidth received is about 800Hz.Because EPIRB detector operating distance is near, the problems such as sensitivity requirement is not high, image frequency suppression.Consider the structure selecting digitised Intermediate Frequency receiver.

Sampling rate is divided into over-sampling and lack sampling.The sampling of leading to intermediate-freuqncy signal to a band can be over-sampling, also can be lack sampling.Intermediate frequency is chosen as 23kHz, and intermediate-freuqncy signal highest frequency is no more than 40kHz, adopts over-sampling can increase signal to noise ratio requirement, can also reduce the requirement of frequency overlapped-resistable filter simultaneously.Selection sample frequency is 128kHz.

EPIRB is when carrying out message sink coding to baseband signal, and adopt two-phase Manchester code, modulation system is two-phase L modulation system, wherein data " 1 " and " 0 " control phase 1.1 ± 0.1rad.When the signal received is subject to seriously declining, the carrier wave extracted generally does not reach requirement, and the frequency deviation environment that Doppler effect etc. cause is more serious.Digital coherent demodulation method, because quadrature demodulation method overcomes these weakness to a certain extent, therefore, demodulation adopts digital quadrature demodulation method.

The TPS650243 power management chip of TI company designs, and core voltage is 1.2V.Adopt DVS (dynamic electric voltage management) technology to realize Design of power saving, realize DVS(dynamic power management with two kinds of voltages), high voltage applications is in normal operating conditions, and low-voltage realizes DVS.TPS650243 is height integrated power supply managing chip, can realize DVS.

Display controller comprises transmit image data logic and screen buffer.Lcd driver has two kinds of interfaces: RGB, IT-RBT601.The screen of the various resolution of support able to programme, needs to consider horizontal and vertical resolution, data width, interface sequence and refresh rate content.The PT035TN01 screen of INNOLUX company, have HV and DE two kinds of patterns, data-line width is 24 bits, and resolution is that 320*240 carries touch-screen, as the input equipment of system simultaneously.

Claims (5)

1. the hand-held EPIRB detector based on XC5VLX85T, it is characterized in that: be made up of radio-frequency signal processing module, digital signal processing module, LCD display control module, power module, detector system according to setting parameter, can detect carrier frequency, the error rate, the transmitting form of EPIRB transmitter.

2. a kind of hand-held EPIRB detector based on XC5VLX85T according to claim 1, it is characterized in that: described EPIRB detector take XC5VLX85T as the core of digital signal processing module, adopt the rough frequency measurement of FFT, Costas ring carries out pinpoint accuracy carrier frequency measurement, and quadrature demodulation carries out demodulation to signal.

3. a kind of hand-held EPIRB detector based on XC5VLX85T according to claim 1, it is characterized in that: described EPIRB detector radio frequency part is made up of as frequency mixer as local oscillator, multiplier ADL5391 low noise radio frequency amplifier ADL5523, integrated phase lock ADF4350, realizes frequency down-conversion function.

4. a kind of hand-held EPIRB detector based on XC5VLX85T according to claim 1, it is characterized in that: described EPIRB detector LCD display control module is connected to digital signal processing module, LCD display can display measurement data, and can operate touch-screen and to modify setting to instrument parameter.

5. a kind of hand-held EPIRB detector based on XC5VLX85T according to claim 1, is characterized in that: described EPIRB detector power module adopts high capacity lithium ion battery to power, and instrument volume is little to be convenient for carrying.