JPH0198100A - Mls receiver - Google Patents

Abstract

PURPOSE:To facilitate pilot's receiving operation by providing a frequency setting memory which searches for a reception frequency in response to the input of the code of an airport or a ground device of a microwave landing system, and outputs a necessary local oscillation signal code. CONSTITUTION:An input signal from an antenna 1 is supplied to an RF band- pass filter device 2, which inputs only frequencies in the frequency band of the microwave landing device (MLS) to a mixer circuit 3. The frequency setting memory 6 is stored with the look-up table of airports which have MLS ground facilities and their channels. When an airport code is set, the memory 6 finds a reception frequency according to the airport code, converts it into a local oscillation signal frequency code, and supplies the code to a synthesizer 5. The synthesizer 5 generates the local oscillation signal frequency with the code and supplies it to the mixer circuit 3. Thus, the pilot's receiving operation is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a microwave landing gear GW (Microwave landing gear GW).
o wave landing system (hereinafter simply referred to as rMLSJ).

(Prior art) MLS has a total of 200 channels from channel numbers 500 to 699, and conventional MLS receivers are installed on the runway of the airport where the aircraft is going to land from among these 200 channels. The channel number of the MLS ground equipment was checked using a chart, etc., and that number was set in the MLS receiver.

(Problems to be Solved by the Invention) However, since the channel number is not a particularly meaningful number, it is difficult for pilots to remember and it takes time to look up.

(Means for Solving the Problems) In order to solve these drawbacks, the present invention improves the channel setting of the MLS receiver by setting airport abbreviations or MLS ground equipment abbreviations that are familiar to pilots and easy to remember. Embodiments will be described in detail below with reference to the drawings.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention, where l is an antenna;
2 is an RF bandpass filter circuit, 3 is a mixer circuit, and 4 is an IP
5 is a synthesizer, and 6 is a frequency setting memory.

Referring to FIG. 1, this MLS receiver is of a synthesizer type and is equipped with a frequency setting memory 6, and is configured to be able to set a frequency corresponding to an airport abbreviation.

That is, the human input signal from the antenna l passes through the RF bandpass filter circuit 2, and only the frequencies in the MLS frequency band are input to the RP input terminal of the mixer circuit 3. On the other hand, the frequency setting memory 6 stores in advance a comparison table of airports with MLS ground equipment and their channels. When an airport abbreviation is set in the MLS receiver to receive an MLS signal, the frequency setting memory 6 indexes the reception frequency from the airport abbreviation,
It is converted into a local oscillation signal frequency code and supplied to the synthesizer 5. The synthesizer 5 generates a local oscillator signal frequency from the code and supplies it to the local oscillator signal input of the mixer circuit 3.

The mixer circuit 3 mixes the received MLS signal and the local signal to generate an IF frequency that is the difference between the two signal frequencies. The 1F' frequency is supplied to the IF' amplifier circuit 4, where it is amplified, and then subjected to signal processing by a signal processing circuit, not shown in FIG. 1, for angle measurement.

Regarding the operation of frequency setting memory 6, please refer to WEXFORD C0U located in Cabrack City, Michigan, USA.
This will be explained using NTY Airport as an example. The airport's abbreviation is CAD.
The MLS ground equipment abbreviation is MAJE, and the channel number is 602.

Now assume that the IF frequency of the MLS receiver is 200 MHz. When the airport's abbreviation CAD is set in the MLS receiver, the frequency setting memory 6 stores the local frequency 4861.6MH.
A code for generating z is supplied to the synthesizer 5. In other words, the airport's channel number is 602, which corresponds to a frequency of 5061.6 MHz. 5061.6M
ML in Hz.

To receive the S signal, set the receiver's local frequency to 506
It may be set to 4861.6 MHz from 1.6 MHz to 200 MHz. The frequency setting memory 6 is a memory for setting reception frequencies in which airport abbreviations and local frequency generation codes created in this way are stored in correspondence.

Furthermore, even if the airport abbreviation is replaced with the MLS ground equipment abbreviation, the same operation can be obtained by the same writing operation.

(Effects of the Invention) As explained above, according to the present invention, by having a frequency setting memory that indexes the receiving frequency from the airport abbreviation, etc. and sets the receiving frequency, pilots can immediately input the airport abbreviation, etc. that are familiar to pilots. has the advantage of being able to receive MLS signals.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an MLS receiver showing an embodiment of the present invention. ■...Antenna, 2...RF bandpass filter circuit, 3...
...Mixer circuit, 4...IP amplifier circuit, 5...Synthesizer, 6...Frequency setting memory. Patent applicant Japan Radio Co., Ltd.

Claims (1)

[Claims] In a synthesizer type receiver having a channel setting function, an airport abbreviation or MLS ground equipment abbreviation and a reception frequency and/or a local oscillation frequency corresponding to the reception frequency are stored in correspondence, and the airport abbreviation or MLS ground equipment abbreviation is An MLS receiver comprising a frequency setting memory that indexes a reception frequency by inputting an abbreviation and outputs a necessary local signal code.