A phase modulation dynamic truncation device

Abstract

The present invention discloses a phase modulation dynamic truncation device, belonging to the fields of communications, radar, electronic countermeasures, and integrated radio frequency technology. The device comprises N-channel phase modulation sampling modules, one-channel energy sensing module, N-channel dynamic truncation modules, N-channel phase demodulation modules, and one-channel beamforming module. By estimating the signal energy within the instantaneous bandwidth, the device adaptively selects an appropriate bit width at the unit level for dynamic truncation. Phase modulation and demodulation are simultaneously introduced to reduce truncation spurious noise. This device optimizes distributed digital array edge acquisition, computing, processing, and other resources and throughput efficiency, while ensuring that the overall array synthesis meets signal-to-noise ratio and dynamic range requirements. This significantly reduces implementation complexity, power consumption, and cost.

Description

Technical Field

[0001] The present invention relates to the fields of communication, radar, electronic countermeasure and integrated radio frequency technology, and in particular to a phase modulation dynamic truncation device for a large-scale digital receiving array. Background Art

[0002] Digital array systems can meet the functional and performance requirements of next-generation communications, radar, electronic countermeasures, and integrated radio frequency systems, requiring reconfigurability, ultra-wideband, and integration. However, the real-time processing of massive digital signals and high throughput required by large digital arrays are key limitations to their application. Based on the fundamental principle that signal-to-interference-noise ratio gain can be achieved through array synthesis combined with degree-of-freedom configuration, the number of bits and precision of edge array data processing can be optimized from the perspective of overall system functionality and performance. This significantly reduces the implementation complexity, power consumption, and cost of digital arrays while still meeting overall system performance.

[0003] Current technologies addressing signal processing and throughput pressures include data compression in the communications field and low-bit-width receiver technology in the radar field. Data compression requires applying a compression algorithm to the raw data, consuming additional computing resources and introducing transmission delays. Furthermore, this technology only optimizes data throughput and fails to reduce processing resources. Low-bit-width receiver technology, primarily used for frequency measurement, has limited functionality, limited configurability, and limited dynamic range and sensitivity. Summary of the Invention

[0004] In order to achieve the goal of significantly reducing implementation complexity, power consumption and cost, the present invention introduces phase modulation dynamic truncation to optimize computing resources and data transmission efficiency from the overall system according to system requirements and usage scenarios. It also has the characteristics of real-time configuration, easy implementation and low latency.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A phase modulation dynamic truncation device includes N-channel phase modulation sampling modules A, one-channel energy sensing module B, N-channel dynamic truncation modules C, N-channel phase demodulation modules D, and one-channel beamforming module E, where N is a set value representing the number of channels;

[0007] The N-channel phase modulation sampling module A is used to receive N analog signals from the system front stage, and output any one of them as a digital signal to the energy sensing module B after analog-to-digital conversion and phase modulation, and output N digital signals to the N dynamic interception module C at the same time;

[0008] The energy sensing module B is used to receive any digital signal output by the phase modulation sampling module A, calculate the energy and compare it with the quantized power, obtain dynamic truncation information based on the comparison result, and output the dynamic truncation information to the N-channel dynamic truncation module C;

[0009] The N-channel dynamic truncation module C is used to receive the digital signal from the phase modulation sampling module A, and dynamically truncate it according to the dynamic truncation information provided by the energy sensing module B, and output the truncation of the N-channel digital signal to the N-channel phase demodulation module D;

[0010] The N-channel phase demodulation module D is used to receive the digital signal after truncation from the dynamic truncation module C, perform phase demodulation and output it to the beamforming module E;

[0011] The beamforming module E is used to receive the signal from the phase demodulation module D, perform beamforming, and output a single-beam signal or a multi-beam signal.

[0012] Among them, the N-channel phase modulation sampling module A completes the analog signal s with a bit width of Bit and a sampling rate of Fs n (t) to digital signal s n [k] conversion, the n-th phase modulation sampling module A makes the sampling clock phase shift PS n After the phase modulation is completed, sampling is performed, where the phase shift amount PS n ~U(-π,+π) is a random variable that obeys uniform distribution; the phase demodulation module D makes the digital signal after dynamic truncation Phase Shift-PS n Complete phase demodulation; where 1≤n≤N.

[0013] Among them, the energy sensing module B senses any digital signal s n [k], use the frequency FFT accumulation or time domain autocorrelation method to calculate the L step signal power P, and compare it with the normalized quantization power threshold, and select the quantization upper limit B according to the quantization power interval in which the power signal falls max , and according to the dynamic range requirements combined with the frequency domain filter gain calculation to obtain the quantization lower limit B min , and the dynamic interception information [B max ,B min ] is provided to N dynamic truncation modules C.

[0014] Among them, the dynamic truncation module C is a digital signal s with a bit width of N channels. n [k] is cut off and [B max ,B min ] bit range, and then output it to the phase demodulation module D.

[0015] Compared with other digital array designs, the present invention has the following advantages:

[0016] (1) Based on system sensitivity and dynamic range decomposition, the digital signal amplitude is judged in real time and adaptive dynamic truncation is performed, which can save computing resources and data throughput pressure;

[0017] (2) Phase modulation is achieved before truncation and phase demodulation is achieved after truncation. After beamforming, the spurious effects caused by truncation can be avoided to monitor and process small signals.

[0018] (3) By utilizing the existing energy sensing, AGC, NCO and beamforming functions in conventional digital arrays, the implementation of the technology of the present invention does not require the use of additional computing resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the phase modulation dynamic truncation array receiving solution of the present invention.

[0020] Figure 2 It is the normalized quantization level corresponding to the sampling bit in the embodiment of the present invention.

[0021] Figure 3 FIG. 4 is a spectrum diagram of the beamforming output before dynamic truncation according to an embodiment of the present invention.

[0022] Figure 4 This is a spectrum diagram of the beamforming output after dynamic truncation according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below through embodiments in conjunction with the accompanying drawings.

[0024] like Figure 1 As shown, a phase modulation dynamic truncation device includes N-channel phase modulation sampling modules A, one-channel energy sensing module B, N-channel dynamic truncation modules C, N-channel phase demodulation modules D and one-channel beamforming module E, where N is a set value representing the number of channels;

[0025] The N-channel phase modulation sampling module A is used to receive N analog signals from the system front stage, and output any one of them as a digital signal to the energy sensing module B after analog-to-digital conversion and phase modulation, and output N digital signals to the N dynamic interception module C at the same time;

[0026] Furthermore, the N-channel phase modulation sampling module A completes the analog signal s with a bit width of Bit and a sampling rate of Fs. n (t) to digital signal s n [k] conversion, the n-th phase modulation sampling module A makes the sampling clock phase shift PS n After the phase modulation is completed, sampling is performed, where the phase shift amount PS n~U(-π, +π) is a random variable that obeys a uniform distribution. Phase modulation can be achieved by phase shifting the sampling clock, by phase shifting the DDC local oscillator, or by phase shifting the digital signal, where 1≤n≤N.

[0027] The energy sensing module B is used to receive any digital signal output by the phase modulation sampling module A, calculate the energy and compare it with the quantized power, obtain dynamic truncation information based on the comparison result, and output the dynamic truncation information to the N-channel dynamic truncation module C;

[0028] Furthermore, the energy sensing module B uses s of any channel n n [k], the maximum value of full-scale level V within the time period of analysis and processing step length L max Normalized amplitude max{s n [k]}, and with quantization level 2 b Compare, where b takes a value between 0 and Bit, and obtain B max satisfy According to the system instantaneous dynamic range and the synthetic gain Δb=[IDR+SNR-10log10(N)] / 6.02, round up and according to B max -Δb can be used to find B min , uniformly provided to the dynamic truncation module C.

[0029] The N-channel dynamic truncation module C is used to receive the digital signal from the phase modulation sampling module A, and dynamically truncate it according to the dynamic truncation information provided by the energy sensing module B, and output the truncation of the N-channel digital signal to the N-channel phase demodulation module D;

[0030] Furthermore, the dynamic truncation module C is based on [B max ,B min ] n [k] Perform dynamic interception, high position interception to B max , low intercept to B min , then output To the phase demodulation module D.

[0031] The N-channel phase demodulation module D is used to receive the digital signal after truncation from the dynamic truncation module C, perform phase demodulation and output it to the beamforming module E;

[0032] Furthermore, the phase demodulation module D makes the digital signal after dynamic truncation Phase Shift-PS n Complete phase demodulation.

[0033] The beamforming module E is used to receive the signal from the phase demodulation module D, perform beamforming, and output a single-beam signal or a multi-beam signal.

[0034] For an N-channel digital array, the sampler bit width is Bit, and the full-scale level is V max (unit V), sampling rate Fs (unit MHz), processing step size L, system instantaneous dynamic range IDR (unit dB), signal demodulation signal-to-noise ratio SNR (unit dB), received time domain analog signal is s n (t);

[0035] In this embodiment, for a digital array with N=256 channels, the sampler bit width is Bit=14, the highest bit is the sign bit, and dynamic truncation is completed in 13 bits. The full-scale level V max =2V, sampling rate is Fs=1024MHz, processing step size is L=2048, system instantaneous dynamic range IDR=55dB, signal demodulation signal-to-noise ratio SNR=10dB, input sine signal 1 has an amplitude of 1V and a frequency of 200MHz, sine signal 2 has an amplitude of 0.001V and a frequency of 100MHz, and additive white Gaussian noise with a signal-to-noise ratio of 50dB is added;

[0036] The sampling quantization and phase modulation are completed by the phase modulation sampling module A, and the maximum level max{s n [k]} and Figure 2 Normalized quantization level is compared to get B max =Bit=13, Δb=7 is calculated by the formula Δb=[IDR+SNR-10log10(N)] / 6.02, B min =6, the range of dynamic truncation is [13,6];

[0037] The dynamic truncation module C completes the truncation of the digital signal, the phase demodulation module D and the beam synthesis module E restore the signal phase coherence and directly sum the N-way signal, and the corresponding beam points in the normal direction. Figure 3 Comparison of the spectrum of the beamforming output before dynamic truncation Figure 3 Spectrum of beamforming output after dynamic truncation Figure 4 , retaining the high 8 bits of the 14-bit sampling data can meet the requirements of the above array system for instantaneous dynamics and demodulation signal-to-noise ratio.

[0038] In summary, the present invention implements a phase modulation dynamic truncation technology, which can significantly reduce the signal processing hardware resources and data throughput pressure of digital arrays while meeting the sensitivity and dynamic range of large-scale arrays. It is particularly suitable for use in receiving systems in the fields of communications, radar, electronic countermeasures, and integrated radio frequency technology.

Claims

1. A phase modulation dynamic truncation device, characterized in that: It includes N-channel phase modulation sampling modules (A), one-channel energy sensing module (B), N-channel dynamic truncation modules (C), N-channel phase demodulation modules (D) and one-channel beamforming module (E), where N is a set value representing the number of channels; The N-channel phase modulation sampling module (A) is used to receive N analog signals from the system front stage, output any one of them as a digital signal to the energy sensing module (B) after analog-to-digital conversion and phase modulation, and simultaneously output N digital signals to the N-channel dynamic interception module (C); The specific processing process of the N-channel phase modulation sampling module (A) is as follows: the N-channel phase modulation sampling module (A) completes the analog signal s with a bit width of Bit and a sampling rate of Fs. n (t) to digital signal s n [k] conversion, the n-th phase modulation sampling module (A) shifts the sampling clock phase PS n After the phase modulation is completed, sampling is performed, where the phase shift amount PS n ~U(-π,+π) is a random variable with uniform distribution, 1≤n≤N; The energy sensing module (B) is used to receive any digital signal output by the phase modulation sampling module (A), calculate the energy, compare it with the quantized power, obtain dynamic truncation information based on the comparison result, and output the dynamic truncation information to the N-channel dynamic truncation module (C); The specific processing process of the energy sensing module (B) is as follows: the energy sensing module (B) processes any digital signal s n [k], use the frequency FFT accumulation or time domain autocorrelation method to calculate the L step signal power P, and compare it with the normalized quantization power threshold, and select the quantization upper limit B according to the quantization power interval in which the power signal falls max , and according to the dynamic range requirements combined with the frequency domain filter gain calculation to obtain the quantization lower limit B min , and the dynamic interception information [B max ,B min ] is provided to N dynamic truncation modules (C); wherein, the dynamic truncation information [B max ,B min The specific calculation process is as follows: the energy sensing module (B) uses s of any channel n n [k], the maximum value of full-scale level V within the time period of analysis and processing step length L max Normalized amplitude max{s n [k]}, and with quantization level 2 b Compare, where b takes a value between 0 and Bit, and obtain B max satisfy According to the system instantaneous dynamic range and the synthetic gain Δb=[IDR+SNR-10log10(N)] / 6.02, round up and according to B max -Δb can be used to find B min , IDR is the instantaneous dynamic range of the system, SNR is the demodulation signal-to-noise ratio; The N-channel dynamic truncation module (C) is used to receive the digital signal from the phase modulation sampling module (A) and perform dynamic truncation according to the dynamic truncation information provided by the energy sensing module (B). Specifically, the digital signal s with a bit width of N channels is s. n [k] is cut off, and [B max ,B min ] bit range of data, corresponding to the output of the truncated N-channel digital signal to the N-channel phase demodulation module (D); The N-channel phase demodulation module (D) is used to receive the digital signal after the dynamic truncation module (C). Phase Shift-PS n After phase demodulation is completed, it is output to the beamforming module (E); The beamforming module (E) is used to receive the signal from the phase demodulation module (D), perform beamforming, and output a single beam signal or a multi-beam signal.

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