Method and device for improving dynamic range of receiver and receiver

Abstract

The invention provides a method and device for improving the dynamic range of a receiver and the receiver, and the method comprises the steps: carrying out the attenuation of an analog signal received by the receiver through attenuation control, and combining the attenuation control with signal amplitude compensation, thereby effectively detecting a signal with a larger amplitude, obtaining the accurate amplitude of the signal, and improving the dynamic range of the receiver. And the dynamic range of the receiver is improved. In the invention, the attenuation of the analog signal is controlled in real time through the attenuation control, the attenuation control and the signal amplitude compensation are combined, when the signal amplitude exceeds the AD saturation power, the analog signal is attenuated through the attenuation control, a signal with a larger amplitude can be effectively detected, and the accurate amplitude of the signal is obtained through the signal amplitude compensation. And the dynamic range of the receiver is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of receivers, and in particular to a method, a device and a receiver for improving the dynamic range of a receiver. Background Art

[0002] The common requirements of modern receivers can be summarized as wide bandwidth, high sensitivity, large dynamic range and high stability. The dynamic range of broadband digital receivers is a key indicator that restricts the system capability. Regardless of the system, the receiver has a high requirement for dynamic range. There are multiple dimensions to describe the signal in the receiver, including frequency, amplitude, pulse width, repetition rate and azimuth. Amplitude can effectively describe the distance of the target and plays a vital role for the receiver.

[0003] How to effectively obtain the amplitude of the signal while improving the dynamic range of the receiver is of vital importance to the system. However, the existing technologies are all about improving the dynamic range of the receiver, but they do not restore the signal amplitude, and thus cannot effectively detect the amplitude of the signal. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention aims to provide a method, device and receiver for improving the dynamic range of a receiver, so as to effectively detect signals with larger amplitudes, restore accurate signal amplitudes, and improve the dynamic range of the receiver.

[0005] A method for improving the dynamic range of a receiver provided by the present invention is:

[0006] The analog signal received by the receiver is attenuated through attenuation control, and combined with attenuation control and signal amplitude compensation, so as to effectively detect signals with larger amplitudes and obtain the accurate amplitude of the signal, thereby improving the dynamic range of the receiver.

[0007] Furthermore, the method for improving the dynamic range of a receiver comprises the following steps:

[0008] S1: The analog signal enters the receiver. If the attenuation module receives the attenuation control command from the attenuation control module, the channel is attenuated.

[0009] S2: ADC performs AD conversion on the analog signal after attenuation control to obtain digital information;

[0010] S3: The signal power calculation module calculates the signal power according to the digital information obtained by AD conversion;

[0011] S4: The attenuation control module determines whether to perform attenuation control on the analog signal according to the signal power, and sends the determination result to the attenuation control module and the amplitude compensation module;

[0012] S5: The sliding FFT module performs a sliding FFT operation with a number of points on the digital information obtained by AD transformation to obtain the signal amplitude;

[0013] S6: The amplitude compensation module completes signal amplitude compensation according to the judgment result of the attenuation control module;

[0014] S7: The signal information reporting module reports the signal amplitude.

[0015] Furthermore, in step S3, the calculating of the signal power includes: accumulating and averaging the signal amplitude according to the digital information obtained by AD conversion, so as to obtain the signal power.

[0016] Furthermore, a compromise needs to be made on the cumulative average points.

[0017] Furthermore, in step S4, the attenuation control module determines whether to perform attenuation control on the analog signal by setting a double threshold.

[0018] Furthermore, the dual threshold is set to determine whether to perform attenuation control on the analog signal, including:

[0019] Set the start attenuation threshold to Th1 and the end attenuation threshold to Th2. When the signal power P sig When the signal power is greater than the start attenuation threshold Th1, the attenuation control of the channel is started. sig When the attenuation value is less than the end attenuation threshold Th2, the attenuation control of the channel ends.

[0020] Further, step S6 specifically includes:

[0021] If the judgment result is that the analog signal needs to be attenuated, the attenuation amplitude is compensated to the signal amplitude accordingly;

[0022] If the judgment result is that the analog signal is not to be attenuated, the signal amplitude is not compensated.

[0023] The present invention also provides a device for improving the dynamic range of a receiver, which is used to execute the above method. The device includes an attenuation module, an ADC, a signal power calculation module, an attenuation control module, a sliding FFT, an amplitude compensation module and a signal information reporting module; the input end of the attenuation control module is used to receive an analog signal, the output end is connected to the input end of the ADC, and the control end is connected to the output end of the attenuation control module, and the output end of the attenuation control module is also connected to the amplitude compensation module; the output end of the ADC is connected to the input end of the attenuation control algorithm via the signal power calculation module on the one hand, and is connected to the signal information reporting module via the sliding FFT module and the amplitude compensation module in sequence on the other hand.

[0024] In some embodiments, the signal power calculation module, attenuation control module, sliding FFT, amplitude compensation module and signal information reporting module can be implemented based on FPGA, and high-speed signal processing is performed in the FPGA.

[0025] The present invention also provides a receiver, wherein the receiver comprises the above-mentioned device for improving the dynamic range of the receiver.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0027] In the present invention, the attenuation of the analog signal is controlled in real time through attenuation control, and the attenuation control and signal amplitude compensation are combined. When the signal amplitude exceeds the AD saturation power, the analog signal is attenuated through attenuation control, and a signal with a larger amplitude can be effectively detected. The accurate amplitude of the signal is obtained through signal amplitude compensation, thereby improving the dynamic range of the receiver. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of improving the dynamic range of a receiver in an embodiment of the present invention.

[0029] Figure 2a This is a Matlab simulation result diagram of AD sampling data with a single threshold attenuation control with a signal amplitude of 500 and a channel attenuation of 25dB in an embodiment of the present invention.

[0030] Figure 2b This is a diagram of Matlab simulation results of double-threshold attenuation control AD ​​sampling data with a signal amplitude of 500 and a channel attenuation of 25dB in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example

[0034] Improving the dynamic range has a crucial impact on the performance of the receiver. This embodiment proposes a method for improving the dynamic range of the receiver: attenuating the analog signal received by the receiver through attenuation control, and combining attenuation control with signal amplitude compensation, so as to effectively detect a signal with a larger amplitude and obtain the accurate amplitude of the signal, thereby improving the dynamic range of the receiver. Figure 1 As shown, the method comprises the following steps:

[0035] S1: The analog signal enters the receiver. If the attenuation module receives the attenuation control command from the attenuation control module, the channel is attenuated, for example, 25dB attenuation is applied to avoid AD saturation (i.e. exceeding the ADC (Analog-to-Digital Converter) range) and the inability to accurately measure the amplitude of the analog signal; otherwise, no processing is performed on the channel.

[0036] S2: ADC performs AD conversion on the analog signal after attenuation control to obtain digital information.

[0037] S3: The signal power calculation module calculates the signal power according to the digital information obtained by AD conversion to measure whether the AD is saturated. Specifically, the signal amplitude is accumulated and averaged according to the digital information obtained by AD conversion to obtain the signal power. The more the accumulated average points, the more stable the signal power is. However, the more the accumulated average points, the greater the attenuation control delay, the worse the real-time performance, and the less suitable for narrow pulses. Therefore, in this embodiment, a compromise is made on the accumulated average points, for example, 16 data points are taken for accumulated average, and the signal power P is obtained by statistics. sig .

[0038] S4: Attenuation control plays a vital role in the stability and correctness of the entire system. In order to ensure the stability of amplitude compensation, the attenuation control module determines whether to perform attenuation control on the analog signal according to the signal power, and sends the judgment result to the attenuation control module and the amplitude compensation module.

[0039] This embodiment provides an execution logic of an attenuation control module, specifically: setting the start attenuation threshold to Th1, the end attenuation threshold to Th2, when the signal power P sig When the signal power is greater than the start attenuation threshold Th1, the attenuation control of the channel is started. sig When the attenuation control of the channel is less than the end attenuation threshold Th2, the attenuation control of the channel will be terminated. In this way, the attenuation control will not be started and terminated repeatedly during a pulse; at the same time, other low-power signals can be received normally after the pulse ends, and the system sensitivity will not be lost. In this way, the dynamic range of reception is improved while ensuring the sensitivity.

[0040] S5: In order to obtain the amplitude of the signal frequency domain, the sliding FFT module performs N points on the digital information obtained by AD transformation fft A sliding FFT (Fast Fourier Transform) operation is performed to obtain the signal amplitude.

[0041] S6: The amplitude compensation module completes the signal amplitude compensation according to the judgment result of the attenuation control module:

[0042] If the judgment result is that the analog signal needs to be attenuated, the attenuation amplitude is compensated to the signal amplitude accordingly;

[0043] If the judgment result is that the analog signal is not to be attenuated, the signal amplitude is not compensated, thereby obtaining the correct signal amplitude.

[0044] S7: The signal information reporting module reports the signal amplitude.

[0045] From the above, it can be seen that when the signal amplitude exceeds the AD saturation power, the analog signal is attenuated through attenuation control, which can effectively detect signals with larger amplitudes, and the accurate amplitude of the signal is obtained through signal amplitude compensation, thereby improving the dynamic range of the receiver.

[0046] In order to further verify the performance and beneficial effects of the present invention, the following simulation was performed in this embodiment:

[0047] Figure 2a This is the Matlab simulation result diagram of AD sampling data with single threshold attenuation control and signal amplitude of 500 and channel attenuation of 25dB. Figure 2b This is the Matlab simulation result of AD sampling data with double threshold attenuation control, signal amplitude is 500, channel attenuation is 25dB. Figure 2a It can be seen from the results that if the signal is not threshold controlled, the signal will be distorted and cannot be correctly restored, resulting in the inability to correctly calculate the signal amplitude later. Figure 2b The dual threshold control attenuation can maintain the attenuation control of the signal during the signal, so that the signal amplitude remains stable and the signal amplitude can be accurately restored in the subsequent processing; and the attenuation is released after the signal ends, and a smaller signal is received to ensure sensitivity. In this way, the signal processing capability of large signals is increased on the basis of ensuring sensitivity.

[0048] Example 2

[0049] Corresponding to the method for improving the dynamic range of the receiver described in Example 1, this embodiment provides a device for improving the dynamic range of the receiver, including an attenuation module, an ADC, a signal power calculation module, an attenuation control module, a sliding FFT, an amplitude compensation module and a signal information reporting module; the input end of the attenuation control module is used to receive an analog signal, the output end is connected to the input end of the ADC, and the control end is connected to the output end of the attenuation control module, and the output end of the attenuation control module is also connected to the amplitude compensation module; the output end of the ADC is connected to the input end of the attenuation control algorithm through the signal power calculation module on the one hand, and is connected to the signal information reporting module through the sliding FFT module and the amplitude compensation module on the other hand. Among them, the signal power calculation module, the attenuation control module, the sliding FFT, the amplitude compensation module and the signal information reporting module can be implemented based on FPGA, and high-speed signal processing is performed in the FPGA. The working principle of the device for improving the dynamic range of the receiver refers to the method for improving the dynamic range of the receiver described in Example 1, and will not be repeated here.

[0050] Example 3

[0051] This embodiment provides a receiver, and the receiver includes the device for improving the dynamic range of a receiver as described in Embodiment 2. The working principle of the device for improving the dynamic range of a receiver is similar to the method for improving the dynamic range of a receiver described in Embodiment 1, and will not be described in detail here.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for improving the dynamic range of a receiver, characterized in that: The analog signal received by the receiver is attenuated through attenuation control, and combined with attenuation control and signal amplitude compensation, so as to effectively detect signals with larger amplitudes and obtain the accurate amplitude of the signal, thereby improving the dynamic range of the receiver.

2. The method for improving the dynamic range of a receiver according to claim 1, characterized in that: The steps include: S1: The analog signal enters the receiver. If the attenuation module receives the attenuation control command from the attenuation control module, the channel is attenuated. S2: ADC performs AD conversion on the analog signal after attenuation control to obtain digital information; S3: The signal power calculation module calculates the signal power according to the digital information obtained by AD conversion; S4: The attenuation control module determines whether to perform attenuation control on the analog signal according to the signal power, and sends the determination result to the attenuation control module and the amplitude compensation module; S5: The sliding FFT module performs a sliding FFT operation with a number of points on the digital information obtained by AD transformation to obtain the signal amplitude; S6: The amplitude compensation module completes signal amplitude compensation according to the judgment result of the attenuation control module; S7: The signal information reporting module reports the signal amplitude.

3. The method for improving the dynamic range of a receiver according to claim 2, characterized in that: In step S3, the calculation of the signal power includes: accumulating and averaging the signal amplitude according to the digital information obtained by AD conversion, so as to obtain the signal power.

4. The method for improving the dynamic range of a receiver according to claim 3, characterized in that: A compromise needs to be made on the cumulative average points.

5. The method for improving the dynamic range of a receiver according to claim 2, characterized in that: In step S4, the attenuation control module determines whether to perform attenuation control on the analog signal by setting a double threshold.

6. The method for improving the dynamic range of a receiver according to claim 5, characterized in that: The dual threshold is set to determine whether to perform attenuation control on the analog signal, including: Set the start attenuation threshold to Th1 and the end attenuation threshold to Th2. When the signal power P sig When the signal power is greater than the start attenuation threshold Th1, the attenuation control of the channel is started. sig When the attenuation value is less than the end attenuation threshold Th2, the attenuation control of the channel ends.

7. The method for improving the dynamic range of a receiver according to claim 2, characterized in that: Step S6 specifically includes: If the judgment result is that the analog signal needs to be attenuated, the attenuation amplitude is compensated to the signal amplitude accordingly; If the judgment result is that the analog signal is not to be attenuated, the signal amplitude is not compensated.

8. A device for improving the dynamic range of a receiver, used to execute the method according to any one of claims 1 to 7, characterized in that: The device comprises an attenuation module, an ADC, a signal power calculation module, an attenuation control module, a sliding FFT, an amplitude compensation module and a signal information reporting module; the input end of the attenuation control module is used to receive an analog signal, the output end is connected to the input end of the ADC, the control end is connected to the output end of the attenuation control module, and the output end of the attenuation control module is also connected to the amplitude compensation module; the output end of the ADC is connected to the input end of the attenuation control algorithm via the signal power calculation module on the one hand, and is connected to the signal information reporting module via the sliding FFT module and the amplitude compensation module in sequence on the other hand.

9. The device for improving the dynamic range of a receiver according to claim 8, characterized in that: The signal power calculation module, attenuation control module, sliding FFT, amplitude compensation module and signal information reporting module can be implemented based on FPGA, and high-speed signal processing is performed in the FPGA.

10. A receiver, characterized in that: The receiver comprises the device for improving the dynamic range of the receiver as claimed in claim 8 or 9.

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