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Method and device for dividing and selecting random time slot for multi-channel variable time window in real time

A multi-channel, time-slot technology, applied in digital transmission systems, electrical components, error prevention, etc., can solve the problems of inability to transmit messages, low system real-time processing, and insufficient real-time processing.

Active Publication Date: 2015-04-01
四川九洲空管科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. The real-time processing of the system is not high, and the real-time processing is not enough, which will lead to the arrival of the message that needs to be transmitted, but the time slot has not been generated or has not arrived, resulting in the problem that the message cannot be transmitted after waiting for a long time, thus reducing the system's performance. real-time

Method used

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  • Method and device for dividing and selecting random time slot for multi-channel variable time window in real time
  • Method and device for dividing and selecting random time slot for multi-channel variable time window in real time
  • Method and device for dividing and selecting random time slot for multi-channel variable time window in real time

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Embodiment 1

[0059] refer to figure 1 as shown,

[0060] 1. 1s is divided into FIS-B time period and TIS-B time period. The length of the entire FIS-B time period is 200ms, and the length of the entire TIS-B time period is 800ms. The first and last guard interval (Tkeep -start=Tkeep-end=6ms), the remaining 188ms of the FIS-B time period (TFIS), and the remaining 788ms of the TIS-B time period (TTIS).

[0061] Among them, the signal characteristics of FIS-B: 32+8*6*9232, a total of 4448 bits, each bit takes 960ns, and it takes 4270080ns to transmit a complete message, about 4.3ms. The length of the entire FIS-B time segment is 200 ms, and the first and last guard time intervals are removed, leaving only 188 ms (TFIS). Divide TFIS into 32 channels on average, and the time of each channel is about 5.8ms, which is enough to transmit a complete FIS-B message. The system can transmit up to 8 FIS-B messages per second, so configure 8 channels among the 32 channels and enable the corresponding ...

Embodiment 1

[0066] Step 1: Delineate the transmission time period of FIS-B message and TIS-B message according to the second pulse; figure 1 The present invention provides a method for real-time division and selection of random time slots with multi-channel variable time windows and a schematic diagram of time segment division in Step 101 of Embodiment 1, as shown in figure 1 As shown, the time period is divided as follows: the specific method is: starting from the second pulse, set the initial Tkeep_start as the FIS-B message transmission start protection time, and then TFIS is the FIS-B message transmission time period, you can use this time period Transmit up to 8 FIS-B messages, then Tkeep_end is the FIS-B message transmission termination protection time, then set Tkeep_start as the TIS-B message transmission start protection time, and then TTIS is the TIS-B message The transmission time period, during which a maximum of 190 TIS-B messages can be transmitted, and then Tkeep_end is the...

Embodiment 2

[0071] Embodiment two: figure 2 for figure 1 The schematic flow chart of delineating a specific FIS-B message transmission channel according to the configuration initial value obtained in step 2 of the illustrated embodiment includes:

[0072] Step 1031, divide the FIS-B time period into 32 channels FIS_gateway1-FIS_gateway32 that can transmit messages, that is, T FIS The FIS-B message transmission time period is expressed in terms of ΔT FIS For stepping, it is divided into 32 channels that can transmit messages;

[0073] Step 1032, obtain the configuration initial value FIS_set_gateway1~FIS_set_gateway8 and the channel enable signal of the FIS-B message transmission channel from the CPU communication interface, and configure 8 transmission channels at most, that is, obtain FIS_set_gateway1, FIS_set_gateway2...FIS_set_gateway8, and the enable signal is high and effective;

[0074]Step 1033, correspond to the FIS_set_gateway configured and the specific channels in the divid...

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Abstract

The invention belongs to the field of message processing, and in particular relates to a method and a device for dividing and selecting a random time slot in real time. To solve the problem in the prior art, the invention provides a method and a device for dividing and selecting a random time slot in real time. According to the invention, the type and the amount of a message are transmitted as required; transmission time channels and transmission time slots are established for message of different types in combination with pulse per second, so that the working efficiency of the system is improved. The method comprises the following steps: firstly, dividing time periods for transmitting an FIS-B (Flight Information Service-Broadcast) message and a TIS-B (Traffic Information Service-Broadcast) message according to pulse per second, obtaining the initial configuration value of an FIS-B message transmission channel according to a CPU (Central Processing Unit) communication interface, and determining a specific FIS-B message transmission channel; secondly, obtaining the initial configuration value of an offset of a TIS-B message transmission time window according to the CPU communication interface, setting the TIS-B message transmission time window, and further dividing the TIS-B message transmission time window; finally, updating the message transmission channel and the time slot according to pulse per second.

Description

technical field [0001] The invention belongs to the field of ADS broadcast message processing, in particular to a method and device for real-time division and selection of random time slots with multi-channel variable time windows. Background technique [0002] In order to enable the aircraft on the route to fly safely, effectively and in a planned manner in the airspace, it is necessary to monitor the flight dynamics of the aircraft in the airspace in real time. The radar surveillance methods in the prior art use the inquiry and response method to detect the target, and the straight-line propagation of the radar beam forms a large number of radar blind spots, which cannot cover areas such as oceans and deserts; the radar rotation period limits the improvement of the data update rate, thereby limiting Improvement of monitoring accuracy; In addition, radar monitoring cannot obtain situational data such as the planned route and speed of the aircraft, which limits the improveme...

Claims

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Application Information

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IPC IPC(8): H04L12/70H04L12/823H04L1/00H04L47/32
Inventor 张炼冯涛刘元春
Owner 四川九洲空管科技有限责任公司
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