Design and Implementation of a Digital Tracking and Ranging Module

Abstract: The information on the design and implementation of a digital tracking and ranging module is provided by excellent flowmeter and flowmeter manufacturers. Introduction One of the main functions of radar is to track and measure the distance to the target. First, the basic principle of radar ranging and tracking is expounded, a new method of design and realization of pulse radar digital tracking ranging module is introduced, and the module is described. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the design and implementation of a digital tracking and ranging module. Introduction One of the main functions of radar is to track and measure the target distance. Firstly, the basic principle of radar ranging and tracking is expounded, a new method of design and realization of pulse radar digital tracking and ranging module is introduced, and the theoretical basis of the module's development is described. This module uses the delay time of the echo signal relative to the transmitted pulse to measure the target distance. According to the characteristics of the tracking pulse, it compares the target echo delay time count value and the tracking pulse count value, and uses the method of digital signal processing to compare the comparison. The results are fed back to the tracking controller to realize the distance tracking of the pulse radar, which has the advantages of high ranging accuracy, stable ranging, strong anti-interference ability and simple circuit. This module is capable of manual tracking and ranging and automatic tracking and ranging of the target. 1. Theoretical design of this module The general radar digital tracking is to identify the delay time difference between the echo signal and the tracking pulse through the time discriminator, and then use the clock pulse to count the time difference, which is fed back to the tracking processing unit as the distance error. In essence, the output of the analog system is digitally converted, that is, the conversion is based on the analog quantity, which is essentially an analog quantity (as shown in Figure 1). There are inevitable systematic errors between the transformations. For example, to count the tracking pulses, the start time of the counting must be synchronized with the radar transmission pulses. It is difficult to achieve complete synchronization. The error between Inevitably. Another example is that the time difference between the echo signal and the tracking pulse in a certain type of radar time discriminator should be converted into a voltage with polarity (there is an error), and then this voltage should be converted into the counting pulse of the distance counter (there is also an error. ) to make the distance counter count up or down to achieve distance tracking of the target. The module only needs to know the binary distance value of the target echo, and then compare it with the binary value of the tracking pulse to form the distance error as feedback to the distance generator for tracking processing. There is no need to compare the time difference between the echo signal and the tracking pulse, which simplifies the circuit structure and reduces the system error. When the whole detection of the radar is completed, the control distance counter and the latch are cleared by the counting stop pulse. The count stop pulse can be generated by the leading edge of the next firing pulse, or it can be provided by the fire control computer. FIG. 2 is a data flow chart of the tracking and ranging module designed by using the above theory, and the module can realize automatic tracking of distance data by using digital technology. The most basic way to turn the target's time delay into a digital quantity is to use a counter and properly control it. When the radar transmits a pulse signal, the T trigger is triggered, which starts the counter at the same time. Once it is determined that the target echo is received, the T trigger is triggered again to stop the counter counting, so that the reading is read at the moment when the echo arrives. The data output by the counter is obtained, that is, the target distance data is obtained. By comparing with the value output by the manual ranging counter, the distance error value is obtained and sent to the controller for tracking processing. The conversion between manual and automatic tracking and ranging is switched through an AND gate. Obviously, the controller and tracking pulse generator of this module are not the controller and tracking pulse generator in the sense shown in Figure 1. At this time, the controller and the tracking pulse generator have been fused together (the traditional three parts are still used to distinguish the entire tracking and ranging module, but the meaning is different). The advantages of this module are simple structure, easy to understand and strong generality. It can be used not only in the entire radar tracking system, but also in the target echo generator and tracking ranging trainer of the general radar trainer. 2. Design of manual/automatic distance tracking and ranging module The digital distance tracking module is composed of a time discriminator, a distance generator and a tracking pulse generator. 2.1 The design of the time discriminator In this module, the time discriminator (distance comparator) is composed of upper and lower latches and a subtraction circuit with a sign bit. The upper latch outputs the actual distance pulse count value of the target echo; the lower latch outputs the distance count value of the tracking pulse; the two distance count values ​​are simultaneously sent to the subtraction circuit with the sign bit,The distance error value with polarity is output as a feedback amount to the distance generator (ie the controller) for tracking processing.

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