CN102064907A

CN102064907A - Method for rejecting wild values of received signals in traffic collision avoidance system (TCAS)

Info

Publication number: CN102064907A
Application number: CN2009102189712A
Authority: CN
Inventors: 史忠科; 黄溢
Original assignee: Xian Feisida Automation Engineering Co Ltd
Current assignee: Xian Feisida Automation Engineering Co Ltd
Priority date: 2009-11-16
Filing date: 2009-11-16
Publication date: 2011-05-18

Abstract

The invention relates to a method for rejecting wild values of received data in a traffic collision avoidance system (TCAS). By the method, the wild values of the received height data and the received distance data are avoided and rejected quickly; and the wild values exist in the received data of the TCAS and the working speed of the system is high, so the wild values must be rejected quickly. The invention provides a method for avoiding and rejecting the wild values of the height data and the distance data. By the method, the interference problem of the wild values of the data is solved; the effectiveness of the received data and the flight safety are guaranteed; the input of the wild values is reduced by simplifying the height source of the TCAS; and the wild values of the height and the distance are further rejected by a corresponding software processing method.

Description

TCAS system received signal method of abnormal value removing and correction

(1) technical field under:

The present invention relates to the method for abnormal value removing and correction of airborne TCAS CAS received signal of new generation.

(2) background technology:

CAS on the aircraft, the US Airways system is called air traffic early warning and CAS (hereinafter to be referred as TCAS), aviation system in Europe is called airborne collision avoidance system, both implications, function are consistent, and composition is also similar substantially, so the present patent application specification is that technical background is described with TCAS.

Through years of development, the TCAS system has developed and multiple model, as: TCAS I, TCAS II, TCAS III, TCASIV.Wherein TCAS II is most widely used at present, and it can provide with different colours and shape to the pilot and show the traffic prompting (TA) of the relative altitude of closing on aircraft, distance, orientation, rising/information such as decline state and show pitch channel change, attitude maintenance, the settling mode (RA) of information such as maintenance highly.Other more highest version model architecture based on TCAS II, difference slightly on function just.

In existing TCAS, the height source of S pattern answering machine has four, i.e. ARINC 429 pressure altitudes, ARINC 575 pressure altitudes, synchronizer altimeter and Gray code altimeter; The height source of TCAS system has two, i.e. ARINC 429 radio altitudes and ARINC552 radio altitude, and also every kind of elevation information all comprises the identical equipment of two covers.TCAS respectively has a height selector switch to use with S pattern answering machine and imports the different given altitude informations in height source.

In TCAS communication, inevitably there are some data faults, these fault values are exactly wild value.If do not carry out unruly-value rejecting, may cause situations such as mistake police or false dismissal to take place, bring extra potential threat to flight safety, therefore, how rejecting wild value just becomes difficult problem in the crashproof communication of TCAS.

The method of unruly-value rejecting is a lot, the method for abnormal value removing and correction that thresholding method of discrimination (3 σ etc.) based on the data statistics characteristic is arranged, estimate based on Kalman relatively commonly used and based on the time domain of signal and the analytical method of frequency domain characteristic.Because the frequency of TCAS request signal, that is to say once the unruly-value rejecting of these methods for the TCAS communication data up to tens times/second, consuming time oversize, in case adopt the burden that will increase processor greatly.Therefore, must seek the purpose that the advantages of simplicity and high efficiency method realizes unruly-value rejecting.

(3) summary of the invention:

Consuming time longer in order to overcome general method of abnormal value removing and correction, can't be applicable to TCAS signal processing at a high speed, the present invention proposes method of abnormal value removing and correction fast, respectively highly wild value and the wild value of distance are rejected;

The technical solution adopted for the present invention to solve the technical problems is: a kind of TCAS received signal method of abnormal value removing and correction, and its characteristics comprise:

(1) to the wild rejecting that is worth of altitude information

Owing to have (ARINC 429 pressure altitudes, ARINC 575 pressure altitudes) of the pressure altitude of belonging to together that (ARINC 429 radio altitudes and ARINC 552 radio altitudes) that belong to radio altitude together are also arranged in a plurality of height source of S pattern answering machine and TCAS transceiver, and these highly can not use simultaneously; So in the design, we remove ARINC 575 pressure altitudes and ARINC 552 radio altitudes, the work that this has simplified system and don't can influence system; Following Fig. 1 of height source interface of TCAS system after integrated and aircraft;

Before the S pattern was replied, at first two data with the input of sustained height source two complete equipments compared, if its difference within certain scope, just thinks that altitude information is correct, can be used as the answer signal emission; If difference has surpassed tolerance limits, think that then altitude information is invalid, need re-enter;

(2) according to the adjust the distance rejecting of the wild value of data of the error variance value of the redundant informations of surveying such as distance, GPS range data and speed;

(a) also do not receive request signal for the other side's aircraft, and this machine has received the radio interference signal that sends from other aircraft, the wild value of the distance of generation; Can be in software the address information that receives and original address information when sending " roll-call formula " inquiry be compared, have only when both are consistent, range counter just stops counting, otherwise range counter works on.So just got rid of the possibility that this mistake takes place;

(b) sent request signal for this machine after, (such as 1 second) just receives answer signal in for a long time, the wild value of the distance of generation; Can behind tens μ s, also not receive answer signal, just launch " roll-call formula " request signal once more.So just can avoid taking place this mistake.

The invention has the beneficial effects as follows: because the method that proposes is in order to satisfy the high speed of TCAS signal processing, therefore, not have versatility fully here.There is not risk in this method implementation process, therefore, can testing in-flight in reality.

(4) description of drawings:

Accompanying drawing 1 is the height source interface schematic diagram of integrated TCAS system and aircraft

(5) embodiment:

1) open country of altitude information value and elimination method

In original T CAS and S pattern transponder system, the height source of S pattern answering machine has four, i.e. ARINC 429 pressure altitudes, ARINC 575 pressure altitudes, synchronizer altimeter and Gray code altimeter; The height source of TCAS system has two, i.e. ARINC 429 radio altitudes and ARINC 552 radio altitudes, and also every kind of elevation information all comprises the identical equipment of two covers.TCAS and S pattern answering machine respectively have a height selector switch.

After TCAS and S pattern answering machine were integrated, S pattern answering machine was as the submodule of TCAS, and its most of interface still remains, ARINC 575 bus interface have just been taken down, equally, TCAS height source, we have given up original AIRNC 552 bus interface.Like this, the height source such as a mistake of whole integral system! Do not find Reference source.Shown in.

Wherein, the height source of TCAS integral system has four, when selecting, all select one of them highly to import at least as the height source at every turn, and two complete equipments in this height source are imported altitude information simultaneously, like this, even given up original ARINC 575 and the input of ARINC 552 bus height, can be not influential to the altitude information of system yet.

In order to prevent that altitude information from making a mistake, before the S pattern was replied, at first two data with the input of sustained height source two complete equipments compared, if its difference is within certain scope, just think that altitude information is correct, can be used as the answer signal emission; If difference has surpassed tolerance limits, think that then altitude information is invalid, need re-enter.In this way, altitude information exists the possibility of wild value to reduce greatly, has improved the design redundancy of system.

The method of abnormal value removing and correction of 2 range data

Aircraft be an important crashproof parameter near rate, change near rate=relative distance variation/time.For obtain this machine and target aircraft near rate, must involve measurement to two airplane relative distances, therefore, the data of relative distance just seem and are even more important.If the measured value of distance makes a mistake, will bring serious consequence.

The open country value of getting rid of range data will be excavated causing its reason that makes a mistake.The method that obtains by the data of adjusting the distance as can be seen, have two kinds of situations may cause the generation of wild value: first the other side's machine does not also receive request signal, this machine has received the radio interference signal that sends from other aircraft, if according to this Time Calculation, two machines that obtain are far smaller than actual distance apart from meeting; It two is that this machine has sent after the request signal, and (such as 1 second) just receives answer signal in for a long time, and two machines that obtain like this are big more a lot of than actual range apart from meeting, this situation than first kind of situation danger many.

For first kind of situation, the solution that we take is: owing to the address information that the information of answering has comprised each aircraft of replying of aircraft, address information when we can inquire with original transmission " roll-call formula " the address information that receives in software compares, have only when both are consistent, range counter just stops counting, otherwise range counter works on.So just got rid of the possibility that this mistake takes place.

For second kind of situation, because this machine TCAS sends request signal at concrete object " roll-call formula " inquiry, when the other side's machine receives this inquiry, generally in tens μ s, will make and replying, unless the other side's machine meets accident when handling, otherwise this mistake can not occur.Therefore, at this mistake, the way of solution is that local TCAS resends " roll-call formula " inquiry, reaffirms the distance of two machines.

By such mode, the probability that distance value makes a mistake will reduce greatly, and come from distance near the calculating of rate, when distance value is accurate, wild value just can not occur near rate.

Claims

1. a TCAS system receives the data method of abnormal value removing and correction, and its feature comprises:

A. simplify the altitude information source of TCAS system;

B. selective reception to altitude information compare, draw effective depth;

C. according to the adjust the distance rejecting of the wild value of data of the error variance value of the redundant informations of surveying such as distance, GPS range data and speed;

2. a TCAS system receives the data method of abnormal value removing and correction, it is characterized in that: remove ARINC 575 pressure altitudes and ARINC 552 radio altitude sources and kept ARINC 429 pressure altitudes and ARINC 429 radio altitude sources with attribute;

3. a TCAS system receives the data method of abnormal value removing and correction, it is characterized in that: compare by two data with the input of sustained height source two complete equipments, according to the validity of its difference range decision height data;

4. a TCAS system receives the data method of abnormal value removing and correction, it is characterized in that: only stop when consistent with request signal receiving the answer signal address during range-viewfinder, just launch request signal and reclocking once more and receive recall signal for a long time.