CN108600138B - Carrier synchronization method for radar communication integrated receiver - Google Patents

Carrier synchronization method for radar communication integrated receiver Download PDF

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CN108600138B
CN108600138B CN201810376760.0A CN201810376760A CN108600138B CN 108600138 B CN108600138 B CN 108600138B CN 201810376760 A CN201810376760 A CN 201810376760A CN 108600138 B CN108600138 B CN 108600138B
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signal
carrier
radar
carrier synchronization
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CN108600138A (en
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曾浩
吉利霞
赵云霄
方贝贝
董涛
殷杰
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Chongqing University
Space Star Technology Co Ltd
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Space Star Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
    • H04L27/2273—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals associated with quadrature demodulation, e.g. Costas loop

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

The pulse signal generated by the radar communication integrated transmitter is composed of two continuous wave forms S1(t) and S2And (t) the first waveform is a BPSK signal using a pseudo-random code as a baseband signal, and the second waveform is a digital modulation signal using a chirp signal as a carrier. The radar communication integrated receiver comprises a carrier synchronization branch, a radar receiving branch and a communication receiving branch which are in parallel structures. The carrier synchronization branch generates a local coherent carrier G through a COSTAS loop in a first time period1(t)＝cos(2πfct) and G2(t)＝sin(2πfct), demodulating pseudo-random code, comparing with local pseudo-random code, determining two-section signal connection time t0(ii) a From t0At the beginning of time, the carrier synchronization branch parameters of the receiver are fixed, and G with stable frequency and continuous phase is generated1(t) and G2(t) simultaneously combining the known parameter mu of the chirp signal, and generating a local coherent carrier wave Z required by the communication receiving branch circuit in the second time period through a complex multiplier1(t) and Z2(t) of (d). The invention can be applied to the technical field of radar communication integration.

Description

Carrier synchronization method for radar communication integrated receiver
Technical Field
The invention relates to the field of radar communication integration, in particular to a radar communication integration receiving carrier synchronization method.
Technical Field
In the radar communication integration technology, a transmitter adopts an integrated waveform design, namely a radar linear frequency modulation signal is used as a carrier signal for communication modulation, and finally, the transmitter generates a digital modulation pulse waveform carrying communication information. The waveform may be expressed as S ═ a · a (t) · cos (2 π f)ct+πμt2)-A·b(t)·sin(2πfct+πμt2) Wherein a (t) and b (t) are baseband signals of in-phase branch and quadrature branch, cos (2 π f)ct+πμt2) And sin (2 π f)ct+πμt2) Is a chirp carrier signal and a is amplitude. In a radar communication integrated receiver, two parallel receiving branches are generally present, one branch is used for radar receiving processing, and the other branch is used for communication receiving processing. The radar receiving process adopts a traditional matched filter mode to complete pulse compression on linear frequency modulation signals, and the communication receiving process adopts a coherent demodulation mode to complete signal demodulation. For the communication receiving branch, coherent demodulation requires the generation of a local coherent carrier. For a digital modulation communication signal with a traditional fixed carrier frequency, a COSTAS loop is adopted to acquire a local synchronous carrier. However, in the radar communication integrated waveform, since the received signal is a pulse waveform, and the signal carrier is a chirp signal, the frequency of which is time-varying, the communication reception process in the radar communication integrated receiver cannot generate a local coherent carrier through the COSTAS loop. By designing the transmitted waveform and processing the signal aiming at the designed waveform in the receiver, the carrier synchronization of the communication receiving branch in the radar communication integrated receiver can be realized.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in the radar communication integrated receiver, a communication receiving process cannot adopt a COSTAS loop to generate a local coherent carrier.
The technical scheme for solving the technical problem is a carrier synchronization method of a radar communication integrated receiver, which is characterized in that:
the pulse signal generated by the radar communication integrated transmitter is composed of two continuous wave forms S1(t) and S2(T) the first segment has a length T1The second section has a length of T2(ii) a The first segment of the waveform is a BPSK modulated signal having a base band pseudo-random code c (T) of length T1Carrier frequency of fcThe output waveform is S1(t)＝A·c(t)·cos(2πfct), A represents a signalAn amplitude; the second section of waveform is a digital modulation signal taking a linear frequency modulation signal as a carrier, wherein the baseband signal of an in-phase branch is a (T) and the length is T2The quadrature branch baseband signal is b (T) and has a length of T2Carrier frequency of fc+ μ t, output waveform S2(t)＝A·a(t)·cos(2πfct+πμt2)-A·b(t)·sin(2πfct+πμt2)；
The radar communication integrated receiver comprises three parallel structures of a carrier synchronization branch, a radar receiving branch and a communication receiving branch; the radar communication integrated receiver receives signals from two sections of continuous waveforms R in time1(t) and R2(t) constitution R1(T) length T1，R2(T) length T2Respectively correspond to the transmission signals S1(t) and S2(t)；
Radar communication integrated receiver in R1(t) time quantum, only the carrier synchronization branch works, and the branch realizes the demodulation of BPSK signals: on the one hand, a coherent local carrier signal G is generated by a carrier synchronization circuit composed of a COSTAS loop1(t)＝cos(2πfct) and G2(t)＝sin(2πfct), on the other hand, two sections of signals R are determined by comparing the demodulated pseudo random code c (t) with the locally stored pseudo random code c (t)1(t) and R2(t) a joining time t0；
From t0Starting at the moment, the radar communication integrated receiver enters into R2(t) in the time period, the carrier synchronization branch, the radar receiving branch and the communication receiving branch work simultaneously; in the carrier synchronization branch, the parameters of the COSTAS loop are fixed, and the fixed frequency f is continuously generatedcAnd a continuous phase sinusoidal signal G1(t) and G2(t) generating a local coherent carrier Z by complex multiplier in combination with a known deterministic parameter mu of the chirp signal1(t)＝cos(2πfct+πμt2) And Z2(t)＝sin(2πfct+πμt2)；Z1(t) and Z2(t) is transmitted to a communication receiving branch as a radar communication integrated signal R2(t) local coherent carrierAnd coherent demodulation is realized.
The invention has the beneficial effect of solving the problem that coherent carriers required by a communication receiving branch are extracted to realize the carrier synchronization of the receiver in the radar communication integrated receiver. The invention can be applied to the technical field of radar communication integration.
Drawings
FIG. 1 is a block diagram of a radar communication integrated receiver
FIG. 2 is a schematic diagram of the time relationship of radar communication integrated transmission waveform
FIG. 3 is a block diagram of a carrier synchronization branch structure of a radar communication integrated receiver
Detailed description of the invention
In the radar communication integration technology, a transmitter transmits radar communication integration waveforms, and a radar receiver realizes radar pulse detection and communication signal reception of the integration waveforms. As shown in fig. 1, the receiver includes an antenna, a radio frequency front end, and three parallel processing modules, i.e., a carrier synchronization branch, a radar receiving branch, and a communication receiving branch. The input of the three parallel branches is intermediate frequency signals, so that received analog signals can be converted into digital signals through an ADC (analog to digital converter), and radar and communication receiving work can be completed in a digital domain. In the three branches, the carrier synchronization branch function is to provide local coherent carriers required by the communication receiving branch, so as to realize coherent demodulation of communication signals.
In order to obtain the local coherent carrier required by the communication receiving branch in the receiver, an auxiliary signal is added when the transmitter waveform is designed. At the moment, the pulse signal generated by the radar communication integrated transmitter is formed by two continuous wave forms S1(t) and S2(T) the first segment has a length T1The second section has a length of T2As shown in fig. 2. Wherein, the first segment of the waveform S1(T) is an auxiliary signal added for carrier synchronization, which is a BPSK modulated signal with a pseudo-random code c (T) as a base band signal, wherein the length of the base band pseudo-random code c (T) is T1Carrier frequency of fcThe output waveform is S1(t)＝A·c(t)·cos(2πfct)，0<t<T1And a denotes a signal amplitude. The second-stage waveform is a digital modulation signal with a chirp signal as a carrier, namely a radar communication integrated waveform. Wherein the in-phase branch baseband signal is a (T) and the length is T2The quadrature branch baseband signal is b (T) and has a length of T2Carrier frequency of fc+ μ t, the slope μ being a fixed constant, the output waveform of the transmitter may be denoted S2(t)＝A·a(t)·cos(2πfct+πμt2)-A·b(t)·sin(2πfct+πμt2) Wherein 0 is<t<T2。
The received signal of the radar communication integrated receiver is also composed of two sections of continuous waveforms R in time1(t) and R2(t) constitution R1(T) length T1，R2(T) length T2Respectively correspond to the transmission signals S1(t) and S2(t) of (d). At R1In the time period (t), only the carrier synchronization branch works and the radar receiving branch and the communication receiving branch do not work in three parallel branches of the receiver. The carrier synchronization tributary implements demodulation of BPSK signals as shown in fig. 3. Due to R1The waveform of (t) is BPSK at a fixed carrier frequency, so that carrier synchronization can be achieved through a COSTAS loop to generate a coherent local carrier signal G1(t)＝cos(2πfct). By the pair G1(t) analyzing and converting to obtain complex signal G (t) ═ G1(t)+jG2(t) in which G2(t)＝sin(2πfct). On the other hand, G1(t) as the coherent carrier of BPSK signal, the baseband pseudo-random code c (t) is obtained by the traditional demodulation method of mixing filtering. Since the pseudorandom code c (t) is a sequence known to the receiver, two segments of signal R can be determined by parsing c (t), i.e., comparing the demodulated pseudorandom code with locally stored pseudorandom codes1(t) and R2(t) a joining time t0I.e. the end of the pseudorandom code c (t).
From t0At the beginning of time, the received signal becomes R2(t), at this time, the carrier synchronization branch, the radar branch and the communication branch work simultaneously. In the carrier synchronization branch, the parameters of the COSTAS loop are fixed to ensureContinuously generating frequency-stable, phase-continuous G1(t) and G2(t) of (d). At the same time, a local coherent carrier Z is generated by a complex multiplier in combination with a known determined parameter mu of the chirp signal1(t)＝cos(2πfct+πμt2) And Z2(t)＝sin(2πfct+πμt2)。Z1(t) and Z2(t) is transmitted to a communication receiving branch as a radar communication integrated waveform R2And (t) carrying out coherent demodulation by using the local coherent carrier. The receiver carrier generation is implemented in the digital domain and the phase change of the waveform is accomplished by a complex multiplier. The complex multiplier input signal is a complex number G (t) ═ G1(t)+jG2(t) and the complex multiplier outputs
Figure GDA0002557748250000041
It is apparent that the real and imaginary parts of Z (t) are Z1(t) and Z2(t)。
The communication receiving branch utilizes coherent carrier waves generated by the carrier synchronization branch, adopts a traditional mixing filtering method, can realize demodulation output of communication baseband signals a (t) and b (t), and has the same working mode of other existing digital demodulation receivers. The radar receiving branch circuit adopts a linear frequency modulation matched filter for receiving, and the working mode of the radar receiving branch circuit is the same as that of the existing radar receiver.
The invention can be applied to the field of radar communication integration, and particularly solves the problem of carrier synchronization by extracting local coherent carriers required by a communication receiving branch from a radar communication integration waveform when communication signal carriers are linear frequency modulation signals in radar communication integration reception.

Claims (1)

1. The carrier synchronization method of the radar communication integrated receiver is characterized in that:
the pulse signal generated by the radar communication integrated transmitter is composed of two continuous wave forms S1(t) and S2(T) the first segment has a length T1The second section has a length of T2(ii) a The first segment of the waveform is a BPSK modulated signal having a base band of pseudorandom code c (t) which is the base band signalT) length of T1Carrier frequency of fcThe output waveform is S1(t)＝A·c(t)·cos(2πfct), a represents the signal amplitude; the second section of waveform is a digital modulation signal taking a linear frequency modulation signal as a carrier, wherein the baseband signal of an in-phase branch is a (T) and the length is T2The quadrature branch baseband signal is b (T) and has a length of T2Carrier frequency of fc+ μ t, output waveform S2(t)＝A·a(t)·cos(2πfct+πμt2)-A·b(t)·sin(2πfct+πμt2)；
The radar communication integrated receiver comprises three parallel structures of a carrier synchronization branch, a radar receiving branch and a communication receiving branch; the radar communication integrated receiver receives signals from two sections of continuous waveforms R in time1(t) and R2(t) constitution R1(T) length T1，R2(T) length T2Respectively correspond to the transmission signals S1(t) and S2(t)；
Radar communication integrated receiver in R1(t) time quantum, only the carrier synchronization branch works, and the branch realizes the demodulation of BPSK signals: on the one hand, a coherent local carrier signal G is generated by a carrier synchronization circuit composed of a COSTAS loop1(t)＝cos(2πfct) and G2(t)＝sin(2πfct), on the other hand, two sections of signals R are determined by comparing the demodulated pseudo random code c (t) with the locally stored pseudo random code c (t)1(t) and R2(t) a joining time t0；
From t0Starting at the moment, the radar communication integrated receiver enters into R2(t) in the time period, the carrier synchronization branch, the radar receiving branch and the communication receiving branch work simultaneously; in the carrier synchronization branch, the parameters of the COSTAS loop are fixed, and the fixed frequency f is continuously generatedcAnd a continuous phase sinusoidal signal G1(t) and G2(t) generating a local coherent carrier Z by complex multiplier in combination with a known deterministic parameter mu of the chirp signal1(t)＝cos(2πfct+πμt2) And Z2(t)＝sin(2πfct+πμt2)；Z1(t) and Z2(t) is transmitted to a communication receiving branch as a radar communication integrated signal R2And (t) carrying out coherent demodulation by using the local coherent carrier.
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