KR101568138B1 - Multi-frequency chirp signal generator - Google Patents

Abstract

The present invention relates to a simultaneous multi-frequency chirp signal generator and, more specifically, to a simultaneous multi-frequency chirp signal generator which includes: an integrated circuit unit (1) which generates a chirp signal, as configured with multiple direct digital frequency synthesizers (DDSs); a multiplexing unit (2) which multiplexes a signal output from the integrated circuit unit (1); a D/A converting unit (3) which converts the signal multiplexed by the multiplexing unit (2) into an analog signal; and a filter unit (4) which is configured with a filter allowing only a signal in a desired band to form the received signal into a desired frequency spectrum.

Description

[0001] Multi-frequency chirp signal generator [

The present invention relates to a co-generator of a multi-frequency coherent signal, and more particularly to a co-generator having a plurality of direct digital frequency synthesizers (DDS) in one integrated circuit, And more particularly, to a multi-frequency co-ordinator co-generator capable of easily generating and transmitting a chirp signal.

Recently, the development trend of satellite microwave image radar technology is focused on multi-frequency, multi-band, multi-polarization, real-time on- Board Processing, Multi-Mode, and Interferometry & Stereo technology.

To this end, it is necessary to provide a multiplication signal generator as many as the number of frequency bands to be used,

There is a problem that not only the number of microwave image radar payloads having different frequencies but also the total weight increases.

In Korean Patent Laid-Open Publication No. 2009-0087219 ("RF signal transmitting and receiving apparatus and method for a radar system ", hereinafter referred to as Prior Art 1), a structure of an RF signal transmitting and receiving apparatus of a radar system is simplified, And an RF signal transmission and reception apparatus of the radar system and a method thereof are disclosed.

Korean Patent Publication No. 10-2009-0087219 (Published Date 2009.08.17.)

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned problems by providing a plurality of direct digital frequency synthesizers (DDS) in a single integrated circuit and outputting a chirp signal ) Of the co-channel signal to be generated and transmitted.

The co-generator of a multi-frequency jam signal according to an embodiment of the present invention includes an integrated circuit unit 1 composed of a plurality of direct digital frequency synthesizers (DDS) and generating a chirp signal, A D / A converter 3 for converting a signal multiplexed by the multiplexer 2 into an analog signal; a multiplexer 2 for multiplexing the signal output from the circuit 1 and a desired frequency And a filter unit 4 composed of a filter for passing only a signal of a desired band so as to form a spectrum.

In this case, the multi-frequency co-ordinator generator further includes a demultiplexer (3a) for demultiplexing the signal converted by the D / A converter (3), and the filter unit (4) And a plurality of low pass filters (LPFs) for passing only signals of a desired band in order to form a signal transmitted by the demultiplexer 3a into a desired frequency spectrum.

The simultaneous multi-frequency co-ordinator may include a timing controller (not shown) for generating a timing control signal for controlling the integrated circuit 1, the multiplexer 2, the D / A converter 3 and the demultiplexer 3a The D / A converter 3 and the demultiplexer 3a operate with the same clock by the timing controller 5a, and the multiplexer 2, the D / A converter 3 and the demultiplexer 3a, The timing controller 1 operates at a lower clock speed than the multiplexer 2, the D / A converter 3 and the demultiplexer 3a by the timing controller 5a,

The integrated circuit unit 1 further includes a first control unit 1a for controlling the blending ratio and frequency of the blink signal and a second control unit 1b for controlling amplitude, phase, trigger and amplification of the blink signal .

The simultaneous multi-frequency co-ordinator generates the I (In phase) channel and the Q (Quadrature) channel by multiplying the multiplexer 2, the D / A converter 3, the demultiplexer 3a, phase channel, and outputs the concatenated signal.

In addition, the multi-frequency co-ordinator generator mixes the I (Inphase) channel signal converted by the D / A converter 3 with an IF carrier to generate a quadrature phase channel A mixer 10 for mixing a signal with an IF carrier shifted by 90 degrees, an IQ modulator 20 for modulating a signal mixed by the mixer 10, and a modulator 20 for modulating the signal modulated by the IQ modulator 20 The RF switch unit 30 includes a RF switch unit 30 for transmitting a signal of a desired frequency band to form a desired frequency spectrum of the signal received by the RF switch unit 30 And a plurality of band-pass filters (BPFs).

Further, the multi-frequency co-ordinator generator generates a timing control signal for controlling the integrated circuit unit 1, the multiplexing unit 2, the D / A conversion unit 3 and the RF switch unit 30, (5b), and further comprises:

The integrated circuit unit 1 further includes a third controller for controlling the rate and frequency of the multiplex signal, and a fourth controller for controlling amplitude, phase, trigger and amplification of the multiplex signal.

The multiplexer signal transmitter according to an embodiment of the present invention includes a signal combiner 100 for combining a plurality of multiplex signals generated by the simultaneous multiple frequency synthesizer, And a high-power amplifier (200) for amplifying and transmitting a signal received from the receiver (100).

Herein, the multi-co-ordinate signal transmitter by the multi-co-ordinate signal co-generator may combine a plurality of co-co-signals generated by the co-coherent multi-frequency co-generator with different carriers and combine them.

In the multi-frequency co-ordinator generator of the present invention constructed as described above, a plurality of direct digital frequency synthesizers (DDS) are provided in one integrated circuit, and a plurality of DDSs A chirp signal can be easily generated.

That is, by multiplexing and demultiplexing the multiplexed signals of different frequencies generated through a plurality of DDSs, it is possible to eliminate the inconvenience of separately providing the multiplexed signal generators of different frequencies and to overcome the disadvantage of the increase in weight There is an advantage.

1 is a configuration diagram of a multi-frequency co-ordinate signal co-generator according to an embodiment of the present invention.
FIG. 2 is a block diagram of a multi-frequency co-ordinate signal generator according to another embodiment of the present invention.
3 is a block diagram of an overlapping signal transmitter according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The following drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms. Also, throughout the specification, like reference numerals designate like elements.

Hereinafter, the technical and scientific terms used herein will be understood by those skilled in the art without departing from the scope of the present invention. Descriptions of known functions and configurations that may be unnecessarily blurred are omitted.

1 is a co-generator of a multi-frequency coherent signal according to an embodiment of the present invention. Referring to FIG. 1, the multi-frequency co-ordinator generator of the present invention will be described in detail.

1, the co-generator of the present invention comprises an integrated circuit unit 1, a multiplexing unit 2, a D / A conversion unit 3, a demultiplexing unit 3a, a filter unit 4 ). ≪ / RTI >

To learn more about each configuration,

The integrated circuit unit 1 is an integrated circuit comprising a plurality of direct digital frequency synthesizers (DDS), and can generate a chirp signal.

The integrated circuit unit 1 may further include a first control unit 1a and a second control unit 1b as shown in FIG. 1,

The first control unit (1a) controls the blending rate and frequency of the blind signal,

The second control unit 1b can control amplitude, phase, trigger and amplification of the multiplex signal.

That is, the integrated circuit unit 1 can generate a coplanar signal having different frequencies.

The multiplexer 2 multiplexes signals output from the integrated circuit 1 and converts the signals multiplexed by the multiplexer 2 into analog signals through the D / A converter 3 can do.

The demultiplexer 3a may demultiplex the signal converted by the D / A converter 3, and the D / A converter 3 may be a digital to analog converter (DAC) .

The filter unit 4 includes a plurality of low pass filters (LPFs) for passing only signals of a desired band so as to form a demultiplexed signal by the demultiplexer 3a into a desired frequency spectrum. .

The filter unit 4 may have different bands according to the purpose, under the control of the user (manager).

1, the timing generator 5a may include a timing controller 5a and a timing controller 5a. The timing controller 5a may include a timing controller 5a, The multiplexing unit 2, the D / A conversion unit 3, and the demultiplexing unit 3a.

The multiplexer 2, the D / A converter 3 and the demultiplexer 3a can operate with the same clock by the timing controller 5a,

The integrated circuit unit 1 can operate at a lower clock speed than the multiplexing unit 2, the D / A conversion unit 3 and the demultiplexing unit 3a by the timing control unit 5a.

Also, as shown in FIG. 1, the co-generator of the multi-frequency coherent signal according to an embodiment of the present invention can output the coherent signal by separating it into an I (In phase) channel and a Q (Quadrature phase) The demultiplexer 2, the D / A converter 3, the demultiplexer 3a, and the filter unit 4 may be divided into an I channel and a Q channel.

In order to overcome the disadvantage of increasing the size and weight of a multi-frequency co-ordinate signal generator using a plurality of IQ modulators according to another embodiment of the present invention, as shown in FIG. 2, Lt; RTI ID = 0.0 > IQ < / RTI > modulators.

More specifically,

2, the co-generator of the multi-frequency co-ordinated signal according to another embodiment of the present invention includes an integrated circuit unit 1, a multiplexing unit 2, a D / A conversion unit 3, a mixing unit 10 ), An IQ modulator 20, an RF switch 30, and a filter 70.

As described above, the integrated circuit unit 1 is an integrated circuit comprising a plurality of direct digital frequency synthesizers (DDS), and can generate a chirp signal. In this way, the integrated circuit unit 1 can generate a coherent signal having different frequencies.

The multiplexer 2 multiplexes the signal output from the integrated circuit 1 and the D / A converter 3 converts the signal multiplexed by the multiplexer 2 into an analog signal .

The mixer 10 mixes the signal of the I channel converted by the D / A converter 3 with an IF carrier and mixes the signal of the Q channel with a 90-phase shifted IF carrier. can do.

That is, as shown in FIG. 2, the analog signal converted by the D / A converter 3 can be mixed using the IF frequency.

The IQ modulator 20 may modulate the mixed signal by the mixing unit 10 and may transmit the modulated signal to the RF switch unit 30.

The filter unit 4 may include a plurality of band pass filters (BPFs) that pass only a desired band signal to form a desired frequency spectrum of a signal received by the RF switch unit 30 .

The filter circuit 4 may be set in accordance with a used band. The contact circuit 1 may include a third controller (not shown) for controlling the ratio and frequency of the cochlea signal, and an amplitude, phase, And a fourth control unit (not shown) for controlling the amplification.

2 is a block diagram of a co-generator of a multi-frequency co-ordinate signal according to another embodiment of the present invention. And may further comprise a timing control section 5b,

The timing control unit 5b can generate a timing control signal for controlling the integrated circuit unit 1, the multiplexing unit 2, the D / A conversion unit 3, and the RF switch unit 30. [

The multiple coherent signal transmitter according to an embodiment of the present invention includes an IQ modulator and an RF switch unit in the multi-frequency coherent signal generator shown in FIG. 2, In order to overcome the problem of increased cost and weight, a signal combiner can be used as shown in FIG.

3, an integrated circuit 1, a multiplexer 2, a D / A converter 3, a mixing unit 10, an IQ modulator 20, an RF switch unit (not shown) 30) and a filter unit (4), the coplanar signal transmitter comprising:

The signal combining unit 100 and the high-power amplifier 200 may be further included.

The signal combining unit 100 may combine a plurality of concatenated signals having different frequencies generated by the simultaneous multi-frequency synthesizer.

At this time, the multiple co-ordinator signal transmitter by the co-generator of multi-frequency coarse signals mixes and combines a plurality of cooperating signals generated by the co-generator of multi-coherent coherent signals with different carriers, Can be combined.

The high power amplifier 200 is a high power amplifier (HPA), and can amplify and transmit a signal received from the signal combiner 100.

That is, in other words, the multi-frequency co-ordinator generator of the present invention includes a plurality of DDSs that can be configured as digital circuits in one integrated circuit unit, thereby generating co- Can be easily generated and transmitted through multiplexing / demultiplexing.

Accordingly, there is an advantage of solving the problem caused by the cochlear signal generator, which must be separately provided for generating a coherent signal having a different frequency.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, fall within the scope of the present invention .

1: integrated circuit part
2: multiplexer
3: D / A conversion section
4: filter unit 3a: demultiplexing unit
5a: Timing control section
10: mixing section 20: IQ modulation section
30: RF switch section 5b: timing control section
100: Signal combining unit 200: High power amplifier

Claims (10)

An integrated circuit unit 1 composed of a plurality of direct digital frequency synthesizers (DDS) and generating a chirp signal;
A multiplexing unit (2) for multiplexing signals output from the integrated circuit unit (1);
A D / A converter 3 for converting a signal multiplexed by the multiplexer 2 into an analog signal;
A filter unit 4 formed of a filter that passes only a signal of a desired band so as to form the received signal into a desired frequency spectrum; And
The timing for controlling the demultiplexing unit 3a for demultiplexing the signals converted by the integrated circuit unit 1, the multiplexing unit 2, the D / A conversion unit 3 and the D / A conversion unit 3, A timing controller 5a for generating a control signal;
And,
The multiplexer 2, the D / A converter 3 and the demultiplexer 3a operate with the same clock by the timing controller 5a,
Characterized in that the integrated circuit section (1) operates at a lower clock speed than the multiplexing section (2), the D / A conversion section (3) and the demultiplexing section (3a) by the timing control section (5a) Signal coincidence.
The method according to claim 1,
The filter section (4)
And a plurality of low pass filters (LPFs) for passing only a signal of a desired band so as to form a signal transmitted by the demultiplexer (3a) into a desired frequency spectrum. generator.
delete 3. The method of claim 2,
The integrated circuit part (1)
A first control unit (1a) for controlling the blending ratio and the frequency of the blink signal; And
A second controller (1b) for controlling the amplitude, phase, trigger and amplification of the cochlea signal;
Wherein the coherent multi-frequency coherent signal generator further comprises:
3. The method of claim 2,
The multi-frequency co-
Separates the multiplexing unit 2, the D / A conversion unit 3, the demultiplexing unit 3a and the filter unit 4 into an I (In phase) channel and a Q (Quadrature phase) channel, And outputs the resultant signal.
An integrated circuit unit 1 composed of a plurality of direct digital frequency synthesizers (DDS) and generating a chirp signal;
A multiplexing unit (2) for multiplexing signals output from the integrated circuit unit (1);
A D / A converter 3 for converting a signal multiplexed by the multiplexer 2 into an analog signal;
A filter unit 4 formed of a filter that passes only a signal of a desired band so as to form the received signal into a desired frequency spectrum;
(In phase) channel signal converted by the D / A conversion unit 3 is mixed with an IF carrier, and a signal of a Q (Quadrature phase) channel is mixed with an IF carrier of 90 phase shifted (10);
An IQ modulator 20 for modulating a signal mixed by the mixer 10; And
An RF switch unit 30 for transmitting a signal modulated by the IQ modulator 20;
And,
The filter section (4)
And a plurality of band pass filters (BPF) for passing only a signal of a desired band to form a signal received by the RF switch unit 30 into a desired frequency spectrum. generator.
The method according to claim 6,
The multi-frequency co-
A timing control section 5b for generating a timing control signal for controlling the integrated circuit section 1, the multiplexing section 2, the D / A conversion section 3, and the RF switch section 30;
Wherein the coherent multi-frequency coherent signal generator further comprises:
The method according to claim 6,
The integrated circuit part (1)
A third control unit for controlling the blending rate and the frequency of the blind signal; And
A fourth control unit for controlling amplitude, phase, trigger and amplification of the coplanar signal;
Wherein the coherent multi-frequency coherent signal generator further comprises:
8. A multiple-frequency signal transmitter according to any one of claims 1, 2 and 4 to 8,
A signal combiner (100) for combining a plurality of concatenated signals generated by the simultaneous multi-frequency co-ordinator; And
A high power amplifier (200) for amplifying and transmitting a signal received from the signal combiner (100);
And a multiplexer for multiplexing the multiplexed signals.
10. The method of claim 9,
Wherein the multiple coherent signal transmitter by the multiple coherent co-
Wherein the multiplexer multiplexes a plurality of multiplex signals generated by the multiplexer with the different carriers.

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