天线测量如何完成锁相

亲爱的先生/女士，我正在天线远场测量测试范围内工作。
用于测量的仪器包括2个信号发生器MXG系列（作为RF和LO信号源），2个LO / IF分配单元85309A，2个混频器85320B和一个PNAX作为接收器。
仪器链接使得我可以在Rx或Tx模式下执行天线方向图测量。
设置简介如下：a。
在测试天线的Rx模式测量期间：在馈电天线侧，我有一个RF信号发生器，其输出作为RF输入馈送到混频器单元。
另一个信号发生器位于测试天线侧，它用作LO源（20 MHz频率偏移）。
该混频器的输出作为*'a2'信号*传递给PNAX输入端口，并用作*参考信号*。
即使对于*锁相*，也使用相同的信号。
在测试天线侧，LO信号通过放大器发送到LO / IF分配单元，然后作为LO源发送到两个混频器（AUT和馈电侧）。
在进料侧，另一个LO / IF单元也用于保持LO水平到达所需范围内的进料侧混合器。
来自RF源的10 MHz信号被发送到LO源，然后通过LO源发送到PNAX。
湾
在测试天线的Tx模式测量期间，该设置是第一设置的补充。
我想知道10 MHz信号的功能以及如何完成锁相。
此外，如何通过这种测量计算天线的相位模式（最好用数学方程或概念）我的第二个问题是，如果在Tx模式测量期间而不是用于直接导出参考信号的范围RF信号（我的意思是RF信号）
如果我有一些其他外部信号源（没有10 MHz控制），我仍可以执行锁相（使用其他喇叭天线捕获信号并使用PLL）并计算天线的相位模式。
请向我提供有关上述主题的详细解释，因为我非常有必要了解这些基本原理。
此外，如果您能直接回复我的邮件或者通过***与我联系以获得答复，我将很高兴。
期待您的及时回复。
谢谢和问候，skamlesh



     以下为原文

  Dear Sir/Madam,

I am working in antenna far field measurement test range. The instrumentation used for measurement includes 2 signal generator MXG series ( as RF and LO signal source), 2 LO/IF distribution units 85309A, 2 mixers 85320 B  and one PNAX as receiver. The instrumentation is chained such that I can perform the antenna pattern measurement in either Rx or Tx mode.  

The brief introduction of setup is as follows:

a. During Rx mode measurement of Antenna under test:

On feed antenna side, I have one RF signal generator whose output is given to feed side Mixer unit as RF input. The other signal generator is at Test Antenna side and it serves as LO source ( 20 MHz frequency offset). The output of this mixer is passed as *'a2' signal* to PNAX input port and used as *reference signal*. The same signal is used even for *phase locking*.  

n test antenna side, LO signal is sent to LO/IF distribution unit via an amplifier and later as LO source to both mixers ( AUT and feed side). On feed side, the other LO/IF unit is also used to keep the LO level reaching to feed side mixer in desired range.

The 10 MHz signal from the RF source is sent to LO source and then to PNAX through LO source.  

b. During Tx mode measurement of antenna under test, the setup is complementary of first setup.

I want to know the functionality of 10 MHz signal and how phase locking is done. Also, how the phase pattern of antenna is computed through this measurement (preferably with mathematical equations or notions)  

My second question is, if during Tx mode measurement instead of the range RF signal being used to derive the reference signal directly ( I mean RF signal being fed to RF input of mixer) if I have some other external source ( without 10 MHz control) can I still perform the phase locking (using some other horn antenna to capture the signal and using PLL) and compute phase pattern of antenna.

Kindly provide me detailed explanation on above topics as I am in deep necessity to understand these fundamentals. Also, I would be glad if you could reply me directly on my mail or contact me on 080-25375200 number for answer.  

Looking forward for your prompt reply.

Thanks and regards,
skamlesh