An adjustable time delay radio frequency signal generation method, system and apparatus

Abstract

The application relates to a kind of adjustable time delay radio frequency signal generation method, system and equipment, method includes: according to the center carrier frequency of the radio frequency signal to be generated and signal baseband element clock determination and sampling frequency;According to the center carrier frequency and signal baseband element clock calculation signal data bit rate;According to carrier frequency generation binary carrier signal;According to baseband signal generation binary baseband signal;According to carrier signal and baseband signal parallel frequency mapping is modulated signal;Frequency selection filtering is carried out to the modulated signal, and radio frequency signal is generated.The signal of the application passes through less analog device, and signal quality is higher.

Description

Technical Field

[0001] This invention belongs to the field of signal generation technology and relates to an adjustable time-delay radio frequency signal generation method, system and device. Background Technology

[0002] In radio systems such as digital communication, navigation, and radar, radio frequency (RF) transmission signals often operate in the L-band or higher. One approach in the generation architecture is to first generate the signal using baseband or intermediate frequency (IF), and then modulate or up-convert it to the RF frequency. This method introduces phase uncertainty into the analog frequency converter, impacting applications such as navigation and beamforming. Another approach uses a high-slew-rate DAC (digital-to-analog converter) to generate the signal in parallel on the mirror signal in the high Nyquist region. However, this method suffers from several drawbacks: firstly, it consumes significant interface protocol resources, making it difficult to apply in resource-constrained environments; secondly, high-speed DACs are expensive, power-consuming, and bulky, hindering their use in miniaturized devices. Summary of the Invention

[0003] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose an adjustable time-delay radio frequency signal generation method, system and device to solve the problems of phase uncertainty, cost, power consumption and size limitations in the direct digital generation of communication, navigation and radar radio frequency signals, and to provide another solution for software radio.

[0004] The technical solution adopted in this invention is as follows:

[0005] This invention discloses a method for generating adjustable time-delay radio frequency signals, comprising:

[0006] The signal data bit rate fs is determined based on the center carrier frequency fcarr of the radio frequency signal to be generated and the signal baseband element generation clock fbb;

[0007] Based on the baseband elements of the signal, a clock fbb is generated, and a 1-bit M-channel baseband data stream s is generated. bb (t);

[0008] A binarized carrier signal is generated based on the center carrier frequency fcarr and the signal data bit rate fs.

[0009] For binarized carrier signals and 1-bit M-channel baseband data streams bb (t) Perform parallel frequency mapping to generate a 1-bit M-channel signal data stream s cb (t);

[0010] For a 1-bit M-channel signal data stream s cb (t) is converted from parallel to serial to become a 1-bit single-channel signal stream s. b (t);

[0011] For a 1-bit single-channel signal stream s b (t) Perform frequency selective filtering to generate the final radio frequency signal.

[0012] In the above generation method, the signal data bit rate fs is the least common multiple of the radio frequency signal center carrier frequency fcarr and the signal baseband element generation clock fbb, and fs≥4*fcarr.

[0013] In the above generation method, a clock fbb is generated based on the signal baseband elements, and a 1-bit M-channel baseband data stream s is generated. bb (t), specifically:

[0014]

[0015] Among them, s tr (t) represents the triangular wave generated by the numerically controlled oscillator (NCO), s tr The time width of (t) is 1 / fbb, s code (t) represents an N-bit single-channel baseband data stream.

[0016] In the above generation method, the N-bit single-channel baseband data stream is generated by generating an N-bit single-channel baseband data stream s containing data, subcode, and pseudocode based on the signal baseband element generation clock fbb. code (t).

[0017] In the above generation method, a triangular wave s is generated by a numerically controlled oscillator (NCO). tr (t), specifically: the delay of the baseband signal is adjusted by adjusting the phase of the NCO, generating a triangular wave s. tr (t), the triangular wave is phase-synchronized with the baseband signal, and the triangular wave is either an inverted triangular wave or an oblique triangular wave.

[0018] In the above generation method, a binarized carrier signal is generated based on the center carrier frequency fcarr and the signal data bit rate fs, specifically as follows:

[0019] Based on the center carrier frequency fcarr, generate carrier data s. carr (t), the formula is:

[0020] s carr (t)=0.5+0.5*sign(sin(2π*fcarr*(t+δ))

[0021] Where δ is a very small positive value; sign(x) is the sign function, when x>0, sign(x)=1; when x=0, sign(x)=0; when x<0, sign(x)=-1;

[0022] Based on the signal data bit rate fs, from the carrier data scarr (t) Take P consecutive sampling points to obtain the binarized carrier signal; where P is the sum of fs / f carr Simplify to obtain the numerator of the simplest fraction P / Q, where Q is the denominator of the simplest fraction.

[0023] In the above generation method, the binarized carrier signal s carr (t) and 1-bit M-band baseband data stream s bb (t) Perform parallel frequency mapping to generate a 1-bit M-channel signal data stream s cb (t), specifically:

[0024] s cb (t)=s bb (t)XOR s carr (t)

[0025] XOR stands for Exclusive OR operation.

[0026] In the above generation method, frequency selective filtering specifically involves: filtering the 1-bit single-channel signal stream s... b (t) Use a bandpass filter to filter and select the desired frequency band to obtain the desired radio frequency signal.

[0027] This invention discloses an adjustable delay radio frequency signal generation system, comprising: a carrier signal generation module, a parallel frequency mapping module, a parallel-to-serial conversion module, and a filter selection module, wherein:

[0028] Carrier signal generation module: Determines the signal data bit rate fs based on the center carrier frequency fcarr and the baseband element generation clock fbb of the RF signal to be generated; generates a 1-bit M-channel baseband data stream s based on the baseband element generation clock fbb. bb (t); Generate a binarized carrier signal based on the center carrier frequency fcarr and the signal data bit rate fs; Combine the binarized carrier signal with the 1-bit M-channel baseband data stream s bb (t) is sent to the parallel frequency mapping module;

[0029] Parallel frequency mapping module: This module maps the binarized carrier signal and the 1-bit M-channel baseband data stream sent by the carrier signal generation module. bb (t) Perform parallel frequency mapping to generate a 1-bit M-channel signal data stream s cb (t); sent to the parallel-to-serial conversion module;

[0030] Parallel-to-serial conversion module: converts the 1-bit M-channel signal data stream sent by the parallel frequency mapping module. cb (t) performs parallel-to-serial conversion to generate a 1-bit single-channel signal stream s. b (t), is sent to the filter selection module;

[0031] Filtering selection module: For the 1-bit single-channel signal stream s sent by the parallel-to-serial conversion module. b (t) Perform frequency selective filtering to generate the final radio frequency signal.

[0032] This invention discloses an electronic device, including a memory and a processor:

[0033] Memory is used to store one or more computer instructions;

[0034] A processor is used to execute one or more computer instructions for:

[0035] The signal data bit rate fs is determined based on the center carrier frequency fcarr of the radio frequency signal to be generated and the signal baseband element generation clock fbb;

[0036] Based on the baseband elements of the signal, a clock fbb is generated, and a 1-bit M-channel baseband data stream s is generated. bb (t);

[0037] A binarized carrier signal is generated based on the center carrier frequency fcarr and the signal data bit rate fs.

[0038] For binarized carrier signals and 1-bit M-channel baseband data streams bb (t) Perform parallel frequency mapping to generate a 1-bit M-channel signal data stream s cb (t);

[0039] For a 1-bit M-channel signal data stream s cb (t) is converted from parallel to serial to become a 1-bit single-channel signal stream s. b (t);

[0040] For a 1-bit single-channel signal stream s b (t) Perform frequency selective filtering to generate the final radio frequency signal.

[0041] Compared with the prior art, the present invention has the following advantages:

[0042] (1) By adopting the single-bit signal stream generation method of the present invention, the DAC can be eliminated, the signal passes through fewer analog devices, and the signal quality is higher;

[0043] (2) The digital mapping method used in this invention can ensure the absolute coherence of the phase of the carrier and baseband signal elements in the signal, which can improve the joint measurement accuracy of the carrier and baseband signals in fields such as radio precision measurement.

[0044] (3) Except for bandpass filtering, the present invention uses digital components to generate signals, which improves the degree of digitization and software integration, making it more flexible and with greater upgrade potential. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of a radio frequency signal generation circuit according to an embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of baseband signal modulation according to an embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of the generation of a binarized carrier signal according to an embodiment of the present invention;

[0048] Figure 4 This is a frequency mapping diagram according to an embodiment of the present invention;

[0049] Figure 5 This is a spectrum diagram according to an embodiment of the present invention;

[0050] Figure 6 This is a schematic diagram of the frequency range after narrowing down according to an embodiment of the present invention. Detailed Implementation

[0051] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0052] like Figure 1 As shown, this invention discloses a method for generating adjustable time-delay radio frequency signals, comprising:

[0053] Step 1: Determine the signal data bit rate fs based on the center carrier frequency fcarr of the RF signal to be generated and the signal baseband element generation clock fbb; the signal data bit rate fs is the least common multiple of the center carrier frequency fcarr of the RF signal and the signal baseband element generation clock fbb, and fs≥4*fcarr.

[0054] Step 2: Generate clock fbb based on the baseband signal elements, and generate 1-bit M-channel baseband data stream s. bb (t);

[0055] Step 3: Generate a binarized carrier signal based on the center carrier frequency fcarr and the signal data bit rate fs;

[0056] Step 4: Analyze the binarized carrier signal and the 1-bit M-channel baseband data stream s. bb (t) Perform parallel frequency mapping to generate a 1-bit M-channel signal data stream s cb (t);

[0057] Step 5: For the 1-bit M-channel signal data stream s cb (t) is converted from parallel to serial to become a 1-bit single-channel signal stream s. b (t);

[0058] Step 6: For the 1-bit single-channel signal stream s b (t) Perform frequency-selective filtering to generate the final RF signal. Transform the 1-bit single-channel signal stream s... b (t) Use a bandpass filter to filter and select the desired frequency band to obtain the desired radio frequency signal.

[0059] like Figure 2 As shown, in step 2, a clock fbb is generated based on the signal baseband elements, and a 1-bit M-channel baseband data stream s is generated. bb (t), specifically:

[0060]

[0061] Among them, s tr (t) represents the triangular wave generated by the numerically controlled oscillator (NCO), s tr The time width of (t) is 1 / fbb, s code (t) represents an N-bit single-channel baseband data stream.

[0062] An N-bit single-channel baseband data stream is generated from the signal baseband element generation clock fbb, which produces an N-bit single-channel baseband data stream s containing data, subcode, and pseudocode. code (t).

[0063] A triangular wave s is generated by a numerically controlled oscillator (NCO). tr (t), specifically: the delay of the baseband signal is adjusted by adjusting the phase of the NCO, generating a triangular wave s. tr (t), the triangular wave is phase-synchronized with the baseband signal, and the triangular wave is either an inverted triangular wave or an oblique triangular wave.

[0064] In step 3, a binarized carrier signal is generated based on the center carrier frequency fcarr and the signal data bit rate fs, specifically as follows:

[0065] like Figure 3 As shown, carrier data s is generated based on the center carrier frequency fcarr. carr (t), the formula is:

[0066] s carr (t)=0.5+0.5*sign(sin(2π*fcarr*(t+δ))

[0067] Where δ is a very small positive value; sign(x) is the sign function, when x>0, sign(x)=1; when x=0, sign(x)=0; when x<0, sign(x)=-1;

[0068] Based on the signal data bit rate fs, from the carrier data s carr(t) Take P consecutive sampling points to obtain the binarized carrier signal; where P is the sum of fs / f carr Simplify to obtain the numerator of the simplest fraction P / Q, where Q is the denominator of the simplest fraction.

[0069] In step 4, the binarized carrier signal s carr (t) and 1-bit M-band baseband data stream s bb (t) Perform parallel frequency mapping to generate a 1-bit M-channel signal data stream s cb (t), specifically:

[0070] s cb (t)=s bb (t)XOR s carr (t)

[0071] XOR stands for Exclusive OR operation.

[0072] This invention discloses an adjustable delay radio frequency signal generation system, comprising: a carrier signal generation module, a parallel frequency mapping module, a parallel-to-serial conversion module, and a filter selection module, wherein:

[0073] Carrier signal generation module: Determines the signal data bit rate fs based on the center carrier frequency fcarr and the baseband element generation clock fbb of the RF signal to be generated; generates a 1-bit M-channel baseband data stream s based on the baseband element generation clock fbb. bb (t); Generate a binarized carrier signal based on the center carrier frequency fcarr and the signal data bit rate fs; Combine the binarized carrier signal with the 1-bit M-channel baseband data stream s bb (t) is sent to the parallel frequency mapping module;

[0074] Parallel frequency mapping module: This module maps the binarized carrier signal and the 1-bit M-channel baseband data stream sent by the carrier signal generation module. bb (t) Perform parallel frequency mapping to generate a 1-bit M-channel signal data stream s cb (t); sent to the parallel-to-serial conversion module;

[0075] Parallel-to-serial conversion module: converts the 1-bit M-channel signal data stream sent by the parallel frequency mapping module. cb (t) performs parallel-to-serial conversion to generate a 1-bit single-channel signal stream s. b (t), is sent to the filter selection module;

[0076] Filtering selection module: For the 1-bit single-channel signal stream s sent by the parallel-to-serial conversion module. b (t) Perform frequency selective filtering to generate the final radio frequency signal.

[0077] This invention discloses an electronic device, including a memory and a processor:

[0078] Memory is used to store one or more computer instructions;

[0079] A processor is used to execute one or more computer instructions for:

[0080] The signal data bit rate fs is determined based on the center carrier frequency fcarr of the radio frequency signal to be generated and the signal baseband element generation clock fbb;

[0081] Based on the baseband elements of the signal, a clock fbb is generated, and a 1-bit M-channel baseband data stream s is generated. bb (t);

[0082] A binarized carrier signal is generated based on the center carrier frequency fcarr and the signal data bit rate fs.

[0083] For binarized carrier signals and 1-bit M-channel baseband data streams bb (t) Perform parallel frequency mapping to generate a 1-bit M-channel signal data stream s cb (t);

[0084] For a 1-bit M-channel signal data stream s cb (t) is converted from parallel to serial to become a 1-bit single-channel signal stream s. b (t);

[0085] For a 1-bit single-channel signal stream s b (t) Perform frequency selective filtering to generate the final radio frequency signal.

[0086] In this embodiment, as Figure 2 As shown, the center carrier frequency fcarr of the radio frequency signal to be generated is 1268.52MHz, the bandwidth BW is 20.46MHz, and the minimum generation clock frequency of the baseband signal is 10.23MHz.

[0087] Based on the method, the carrier generation clock frequency 2*fcarr is selected as 2537.04MHz, and the final bit stream rate is 5074.08MHz.

[0088] M=8 can be selected to generate 8 parallel signals.

[0089] Figure 5 The spectrum of the broadband signal generated according to this method. Figure 6 Select the filtered details for the frequency.

[0090] The above description is only the best specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the protection scope of the present invention.

[0091] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A method for generating adjustable time-delay radio frequency signals, characterized in that, include: The signal data bit rate fs is determined based on the center carrier frequency fcarr of the radio frequency signal to be generated and the signal baseband element generation clock fbb; Based on the aforementioned baseband signal elements, a clock fbb is generated, resulting in a 1-bit M-channel baseband data stream. ; A binarized carrier signal is generated based on the center carrier frequency fcarr and the signal data bit rate fs. For the binarized carrier signal and the 1-bit M-channel baseband data stream Perform parallel frequency mapping to generate a 1-bit M-channel signal data stream. ; For the 1-bit M-channel signal data stream Perform parallel-to-serial conversion to become a 1-bit single-channel signal stream. ; For the 1-bit single-channel signal stream Frequency selective filtering is performed to generate the final radio frequency signal; The clock fbb is generated based on the signal baseband elements, and a 1-bit M-channel baseband data stream is generated. Specifically: in, The triangular wave is generated by a numerically controlled oscillator (NCO). The time width is 1 / fbb. It is an N-bit single-channel baseband data stream; Based on the center carrier frequency fcarr and the signal data bit rate fs, a binarized carrier signal is generated, specifically as follows: Based on the center carrier frequency fcarr, generate carrier data. The formula is: in, It is a very small positive value; For a sign function, when x>0, When x=0, When x < 0, ; Based on the signal data bit rate fs, from the carrier data By continuously sampling P points, a binarized carrier signal is obtained; where P is the sum of fs / Simplify to obtain the numerator of the simplest fraction P / Q, where Q is the denominator of the simplest fraction; For the binarized carrier signal and 1-bit M-band baseband data stream Perform parallel frequency mapping to generate a 1-bit M-channel signal data stream. Specifically: in, This indicates the XOR operation.

2. The adjustable time-delay radio frequency signal generation method according to claim 1, characterized in that: The signal data bit rate fs is the least common multiple of the radio frequency signal center carrier frequency fcarr and the signal baseband element generation clock fbb, and fs ≥ 4. fcarr.

3. The adjustable time-delay radio frequency signal generation method according to claim 1, characterized in that: The N-bit single-channel baseband data stream is specifically generated by: generating an N-bit single-channel baseband data stream containing data, subcode, and pseudocode based on the signal baseband element generation clock fbb. .

4. The adjustable time-delay radio frequency signal generation method according to claim 1, characterized in that: The triangular wave is generated by the numerically controlled oscillator NCO. Specifically, the delay of the baseband signal is adjusted by changing the phase of the NCO to generate a triangular wave. The triangular wave is phase-synchronized with the baseband signal, and the triangular wave is an inverted triangular wave or an oblique triangular wave.

5. The adjustable time-delay radio frequency signal generation method according to claim 1, characterized in that: The frequency selective filtering specifically involves: filtering a 1-bit single-channel signal stream. By using a bandpass filter, the desired frequency band is selected to obtain the required radio frequency signal.

6. An adjustable time-delay radio frequency signal generation system, characterized in that, An adjustable delay radio frequency signal generation method as described in any one of claims 1 to 5 is adopted, comprising: a carrier signal generation module, a parallel frequency mapping module, a parallel-to-serial conversion module, and a filter selection module, wherein: Carrier signal generation module: Determines the signal data bit rate fs based on the center carrier frequency fcarr of the RF signal to be generated and the signal baseband element generation clock fbb; generates a 1-bit M-channel baseband data stream based on the signal baseband element generation clock fbb. Based on the center carrier frequency fcarr and the signal data bit rate fs, a binarized carrier signal is generated; the binarized carrier signal and a 1-bit M-channel baseband data stream are then combined. Send to the parallel frequency mapping module; Parallel frequency mapping module: This module processes the binarized carrier signal and 1-bit M-channel baseband data stream sent by the carrier signal generation module. Perform parallel frequency mapping to generate a 1-bit M-channel signal data stream. Send to the parallel-to-serial conversion module; Parallel-to-serial conversion module: Converts the 1-bit M-channel signal data stream sent by the parallel frequency mapping module. Perform parallel-to-serial conversion to generate a 1-bit single-channel signal stream. It is sent to the filter selection module; Filtering selection module: For the 1-bit single-channel signal stream sent by the parallel-to-serial conversion module. Frequency selective filtering is performed to generate the final radio frequency signal.

7. An electronic device, characterized in that, Including memory and processor: The memory is used to store one or more computer instructions; The processor is configured to execute one or more computer instructions for: performing an adjustable delay radio frequency signal generation method as described in claim 1.

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